Gerd Möllmann <gerd.moellmann@HIDDEN>
to control <at> debbugs.gnu.org.
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[2003:e0:b726:5700:6426:b18a:2c37:a3d2]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ac239736806sm581935466b.114.2025.03.09.04.33.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Mar 2025 04:33:31 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal In-Reply-To: <878rlveo32.fsf@HIDDEN> References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN> <m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN> <87r0zpi9za.fsf@HIDDEN> <83y1twwv7w.fsf@HIDDEN> <87edvohx2s.fsf@HIDDEN> <83a66cvwob.fsf@HIDDEN> <87lepver2e.fsf@HIDDEN> <878rlveo32.fsf@HIDDEN> Date: Sun, 09 Mar 2025 12:33:30 +0100 Message-ID: <m24j02781h.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 57607 Cc: Eli Zaretskii <eliz@HIDDEN>, 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Akib, sorry for effectively loosing this in time. I guess I thought others would take this up. I fixed this now in master, in a different form because your patches did no longer apply due to the new tty child frame stuff. It was easier that way for me. And closing.
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <83o7urvjdz.fsf@HIDDEN> (Eli Zaretskii's message of "Tue, 04 Oct
2022 15:54:48 +0300")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
<m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN>
<m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN>
<m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN>
<87r0zpi9za.fsf@HIDDEN> <83y1twwv7w.fsf@HIDDEN>
<87edvohx2s.fsf@HIDDEN> <83a66cvwob.fsf@HIDDEN>
<87lepver2e.fsf@HIDDEN> <83o7urvjdz.fsf@HIDDEN>
Date: Fri, 07 Oct 2022 19:10:08 +0600
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Eli Zaretskii <eliz@HIDDEN> writes:
>> From: Akib Azmain Turja <akib@HIDDEN>
>> Cc: 57607 <at> debbugs.gnu.org, gerd.moellmann@HIDDEN
>> Date: Tue, 04 Oct 2022 18:00:57 +0600
>>=20
>> > Please try with some 2-column CJK characters, I'm not sure the example
>> > with ^L is relevant here. You can find the list of wide characters in
>> > characters.el (search for "width"); for example, characters in the
>> > U+FF00 block can be useful.
>>=20
>> Thanks, "CJK STROKE D" doesn't work as expected, and the result depends
>> on terminal in use. How can I determine the width of a glyph?
>
> Like this:
>
> (char-width CHAR)
>
> where CHAR is the character you are interested in. For example:
>
> (char-width #x31D4)
> =3D> 2
>
> From C, you can call char_width, like Fchar_width (which see) does.
>
> One other subtle point: the argument STRING to tty_write_glyphs is a
> string of 'struct glyph' objects, not a string of characters. Each
> struct glyph has the code of the character to display in its u.ch
> member, if the glyph is a simple character glyph; for the full story
> see encode_terminal_code.
Thanks.
I just discovered new type of glyph: padding glyph. What's this? Is
this a nop glyph? I guess it's used to make string of width N use N
numbers of glyph. But how? Is this like [CJK PAD] or [PAD CJK]?
>
>> > (And the existing code could have bugs,
>> > no need to assume it is always correct.)
>>=20
>> Yes, it can, but in most cases, my brain has more bugs.
>
> Indeed, that the existing code has bugs should not be our first
> hypothesis. But it shouldn't be axiomatic that there are no bugs
> there ;-)
>
>> > face_id is an integer, and zero is a valid value (it means the default
>> > face), so NULL won't do. But you can use -1 to mean "no face ID".
>> > Just make sure you never pass it to FACE_FROM_ID etc.
>> >
>> > Thanks.
>>=20
>> OK, I'll try that. Thanks.
>
> TIA
=2D-=20
Akib Azmain Turja
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From: Akib Azmain Turja <akib@HIDDEN>
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To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <87lepver2e.fsf@HIDDEN> (Akib Azmain Turja's message of
"Tue, 04 Oct 2022 18:00:57 +0600")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
<m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN>
<m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN>
<m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN>
<87r0zpi9za.fsf@HIDDEN> <83y1twwv7w.fsf@HIDDEN>
<87edvohx2s.fsf@HIDDEN> <83a66cvwob.fsf@HIDDEN>
<87lepver2e.fsf@HIDDEN>
Date: Tue, 04 Oct 2022 19:05:21 +0600
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Akib Azmain Turja <akib@HIDDEN> writes:
> Eli Zaretskii <eliz@HIDDEN> writes:
>
>>> From: Akib Azmain Turja <akib@HIDDEN>
>>> Cc: 57607 <at> debbugs.gnu.org, gerd.moellmann@HIDDEN
>>> Date: Tue, 04 Oct 2022 13:22:51 +0600
>>>=20
>>> > Thanks. But could you please describe the idea of the patch in some
>>> > comment? It is hard to follow the code, especially since the diff has
>>> > many pure whitespace changes.
>>>=20
>>> The idea is that you write the string just like before (for example, you
>>> want to write "hello" in a five columns width terminal, so you write
>>> only "hell", so that the line shows "hell "), then move a character
>>> backward and write the last glyph (write "o", so that the line shows
>>> "helo "), move a character backward again and arrange that after writing
>>> the next glyph, the character on the current position will be pushed
>>> towards right and write the glyph before the last one (write "l", now
>>> the line shows "hello").
>>>=20
>>> Should I add the explanation to the function as comment?
>>
>> Yes, please. It would also help if the respective parts of the code
>> were annotated with comments that explain their role in the algorithm.
>
> OK.
Done.
>
>>
>>> > Also, this:
>>> >
>>> >> + /* Go to the previous position. */
>>> >> + cmgoto (tty, curY (tty), curX (tty) - 1);
>>> >> + cmplus (tty, 1);
>>> >
>>> > Seem to assume the last character takes just one column? What about
>>> > characters whose width is 2 columns?
>>>=20
>>> Yes, I assume that. I don't think any multi-char width glyph reach this
>>> function (I think they are converted to single column width glyphs, for
>>> example "^L" is converted to "^" and "L"). The reason of the assumption
>>> is the following code:
>>>=20
>>> --8<---------------cut here---------------start------------->8---
>>> if (AutoWrap (tty)
>>> && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
>>> && (curX (tty) + len) =3D=3D FRAME_COLS (f))
>>> len --;
>>> --8<---------------cut here---------------end--------------->8---
>>>=20
>>> Which also assumes the same.
>>
>> Please try with some 2-column CJK characters, I'm not sure the example
>> with ^L is relevant here. You can find the list of wide characters in
>> characters.el (search for "width"); for example, characters in the
>> U+FF00 block can be useful.
>
> Thanks, "CJK STROKE D" doesn't work as expected, and the result depends
> on terminal in use. How can I determine the width of a glyph?
>
>> (And the existing code could have bugs,
>> no need to assume it is always correct.)
>
> Yes, it can, but in most cases, my brain has more bugs.
>
>>
>>> > And finally, it would be nice to avoid so much code duplication
>>> > between tty_write_glyphs and tty_write_glyphs_with_face. Is that
>>> > feasible?
>>>=20
>>> Yes, I think so. I think it possible to just add a new argument
>>> "face_id" to tty_write_glyphs would the trick. tty_write_glyph will try
>>> to use "face_id" if it is specified, otherwise fallback to the face_id
>>> in the string. But how to "not" specify a face_id? Would a NULL work?
>>
>> face_id is an integer, and zero is a valid value (it means the default
>> face), so NULL won't do. But you can use -1 to mean "no face ID".
>> Just make sure you never pass it to FACE_FROM_ID etc.
>>
>> Thanks.
>
> OK, I'll try that. Thanks.
Done. Looks like Emacs still works. Here are the patches:
--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline;
filename=0001-Write-on-the-bottom-right-character-cell-on-terminal.patch
Content-Transfer-Encoding: quoted-printable
Content-Description: PATCH 1/2
From=2072af00d8610bdc194062b246aab0e38f22174aeb Mon Sep 17 00:00:00 2001
From: Akib Azmain Turja <akib@HIDDEN>
Date: Mon, 3 Oct 2022 14:18:59 +0600
Subject: [PATCH 1/2] Write on the bottom-right character cell on terminal
Correctly write on the bottom-right character cell on text terminals
if the terminal allows to do this. Also fixes bug#57728.
* src/term.c (tty_write_glyphs, tty_write_glyphs_with_face): Write on
the bottom-right character cell if the terminal supports it.
* src/term.c (glyph_on_char_cell_before_last): New static variable to
hold the current glyph on the character cell before the cell on the
bottom-right corner.
=2D--
src/term.c | 266 ++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 225 insertions(+), 41 deletions(-)
diff --git a/src/term.c b/src/term.c
index 2e43d892..283a65c4 100644
=2D-- a/src/term.c
+++ b/src/term.c
@@ -718,7 +718,7 @@ encode_terminal_code (struct glyph *src, int src_len,
return (encode_terminal_dst);
}
=20
=2D
+static struct glyph glyph_on_char_cell_before_last;
=20
/* An implementation of write_glyphs for termcap frames. */
=20
@@ -727,7 +727,7 @@ tty_write_glyphs (struct frame *f, struct glyph *string=
, int len)
{
unsigned char *conversion_buffer;
struct coding_system *coding;
=2D int n, stringlen;
+ int n, stringlen, write_on_last_cell;
=20
struct tty_display_info *tty =3D FRAME_TTY (f);
=20
@@ -737,55 +737,158 @@ tty_write_glyphs (struct frame *f, struct glyph *str=
ing, int len)
/* Don't dare write in last column of bottom line, if Auto-Wrap,
since that would scroll the whole frame on some terminals. */
=20
=2D if (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f))
+ write_on_last_cell =3D (AutoWrap (tty)
+ && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
+ && (curX (tty) + len) =3D=3D FRAME_COLS (f));
+ if (write_on_last_cell)
len --;
=2D if (len <=3D 0)
=2D return;
=20
=2D cmplus (tty, len);
+ if (FRAME_COLS (f) =3D=3D 1
+ || !(tty->TS_ins_char || tty->TS_ins_multi_chars
+ || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
+ write_on_last_cell =3D false;
+
+ if (len <=3D 0 && !write_on_last_cell)
+ return;
=20
/* If terminal_coding does any conversion, use it, otherwise use
safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_E=
NCODING_MASK
+ coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
+ & CODING_REQUIRE_ENCODING_MASK)
? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
/* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
=2D for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
+ if (len > 0)
{
=2D /* Identify a run of glyphs with the same face. */
=2D int face_id =3D string->face_id;
+ cmplus (tty, len);
+
+ if (write_on_last_cell)
+ glyph_on_char_cell_before_last =3D string[len - 1];
+
+ for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
+ {
+ /* Identify a run of glyphs with the same face. */
+ int face_id =3D string->face_id;
+
+ for (n =3D 1; n < stringlen; ++n)
+ if (string[n].face_id !=3D face_id)
+ break;
+
+ /* Turn appearance modes of the face of the run on. */
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
=20
=2D for (n =3D 1; n < stringlen; ++n)
=2D if (string[n].face_id !=3D face_id)
=2D break;
+ if (n =3D=3D stringlen && !write_on_last_cell)
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer =3D encode_terminal_code (string, n,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+ string +=3D n;
=20
=2D /* Turn appearance modes of the face of the run on. */
+ /* Turn appearance modes off. */
+ turn_off_face (f, face_id);
+ tty_turn_off_highlight (tty);
+ }
+ }
+
+ /* Write on the bottom-right corner. */
+ if (write_on_last_cell)
+ {
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ int face_id =3D string->face_id;
+
+ /* Turn appearance modes of the face. */
tty_highlight_if_desired (tty);
turn_on_face (f, face_id);
=20
=2D if (n =3D=3D stringlen)
=2D /* This is the last run. */
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer =3D encode_terminal_code (string, n, coding);
+ conversion_buffer =3D encode_terminal_code (string, 1, coding);
if (coding->produced > 0)
{
block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced, tty->output);
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
clearerr (tty->output);
if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ /* Arrange that after writing the next glyph, the glyph on the
+ current character cell is somehow pushed to the bottom-right
+ corner. */
+ if (tty->TS_ins_char)
+ {
+ OUTPUT1 (tty, tty->TS_ins_char);
+ }
+ else if (tty->TS_ins_multi_chars)
+ {
+ char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1, 0,
+ 0, 0);
+ OUTPUT1 (tty, buf);
+ xfree (buf);
+ }
+ else
+ {
+ tty_turn_on_insert (tty);
+ }
+
+ if (face_id !=3D glyph_on_char_cell_before_last.face_id)
+ {
+
+ /* Turn appearance modes of the face. */
+ turn_off_face (f, face_id);
+ tty_turn_off_highlight (tty);
+
+ face_id =3D glyph_on_char_cell_before_last.face_id;
+
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
+ }
+
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer
+ =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
unblock_input ();
}
=2D string +=3D n;
=20
/* Turn appearance modes off. */
turn_off_face (f, face_id);
tty_turn_off_highlight (tty);
+
+ tty_turn_off_insert (tty);
}
=20
cmcheckmagic (tty);
@@ -799,6 +902,7 @@ tty_write_glyphs_with_face (register struct frame *f, r=
egister struct glyph *str
{
unsigned char *conversion_buffer;
struct coding_system *coding;
+ int write_on_last_cell;
=20
struct tty_display_info *tty =3D FRAME_TTY (f);
=20
@@ -808,38 +912,118 @@ tty_write_glyphs_with_face (register struct frame *f=
, register struct glyph *str
/* Don't dare write in last column of bottom line, if Auto-Wrap,
since that would scroll the whole frame on some terminals. */
=20
=2D if (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f))
+ write_on_last_cell =3D (AutoWrap (tty)
+ && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
+ && (curX (tty) + len) =3D=3D FRAME_COLS (f));
+ if (write_on_last_cell)
len --;
=2D if (len <=3D 0)
=2D return;
=20
=2D cmplus (tty, len);
+ if (FRAME_COLS (f) =3D=3D 1
+ || !(tty->TS_ins_char || tty->TS_ins_multi_chars
+ || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
+ write_on_last_cell =3D false;
+
+ if (len <=3D 0 && !write_on_last_cell)
+ return;
=20
/* If terminal_coding does any conversion, use it, otherwise use
safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_E=
NCODING_MASK
+ coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
+ & CODING_REQUIRE_ENCODING_MASK)
? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
=2D /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
=2D the tail. */
+
+ /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only
+ at the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
/* Turn appearance modes of the face. */
tty_highlight_if_desired (tty);
turn_on_face (f, face_id);
=20
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer =3D encode_terminal_code (string, len, coding);
=2D if (coding->produced > 0)
+ if (len > 0)
+ {
+ cmplus (tty, len);
+ if (write_on_last_cell)
+ glyph_on_char_cell_before_last =3D string[len - 1];
+ else
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+
+ conversion_buffer =3D encode_terminal_code (string, len, coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+ }
+
+ /* Write on the bottom-right corner. */
+ if (write_on_last_cell)
{
=2D block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced, tty->output);
=2D clearerr (tty->output);
=2D if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
=2D unblock_input ();
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ conversion_buffer =3D encode_terminal_code (string, 1, coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ /* Arrange that after writing the next glyph, the glyph on the
+ current character cell is somehow pushed to the bottom-right
+ corner. */
+ if (tty->TS_ins_char)
+ {
+ OUTPUT1 (tty, tty->TS_ins_char);
+ }
+ else if (tty->TS_ins_multi_chars)
+ {
+ char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1,
+ 0, 0, 0);
+ OUTPUT1 (tty, buf);
+ xfree (buf);
+ }
+ else
+ {
+ tty_turn_on_insert (tty);
+ }
+
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer
+ =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ tty_turn_off_insert (tty);
}
=20
/* Turn appearance modes off. */
=2D-=20
2.37.1
--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline;
filename=0002-Merge-tty_write_glyphs-and-tty_write_glyphs_with_fac.patch
Content-Transfer-Encoding: quoted-printable
Content-Description: PATCH 2/2
From=20b090cba28981d7a0e40f87211e9b8b065bfdf3e3 Mon Sep 17 00:00:00 2001
From: Akib Azmain Turja <akib@HIDDEN>
Date: Tue, 4 Oct 2022 18:54:58 +0600
Subject: [PATCH 2/2] Merge tty_write_glyphs and tty_write_glyphs_with_face
* src/term.c (tty_write_glyphs_1, tty_write_glyphs)
(tty_write_glyphs_with_face): Merge tty_write_glyphs and
tty_write_glyphs_with_face into tty_write_glyphs_1. Define
tty_write_glyphs as a wrapper of tty_write_glyphs_1.
=2D--
src/term.c | 243 +++++++++++++++++------------------------------------
1 file changed, 79 insertions(+), 164 deletions(-)
diff --git a/src/term.c b/src/term.c
index 283a65c4..db1dd2a4 100644
=2D-- a/src/term.c
+++ b/src/term.c
@@ -723,7 +723,8 @@ encode_terminal_code (struct glyph *src, int src_len,
/* An implementation of write_glyphs for termcap frames. */
=20
static void
=2Dtty_write_glyphs (struct frame *f, struct glyph *string, int len)
+tty_write_glyphs_1 (struct frame *f, struct glyph *string, int len,
+ int face_id)
{
unsigned char *conversion_buffer;
struct coding_system *coding;
@@ -761,6 +762,13 @@ tty_write_glyphs (struct frame *f, struct glyph *strin=
g, int len)
the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
+ if (face_id >=3D 0)
+ {
+ /* Turn appearance modes of the face. */
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
+ }
+
if (len > 0)
{
cmplus (tty, len);
@@ -770,16 +778,27 @@ tty_write_glyphs (struct frame *f, struct glyph *stri=
ng, int len)
=20
for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
{
=2D /* Identify a run of glyphs with the same face. */
=2D int face_id =3D string->face_id;
+ int local_face_id;
=20
=2D for (n =3D 1; n < stringlen; ++n)
=2D if (string[n].face_id !=3D face_id)
=2D break;
+ if (face_id >=3D 0)
+ {
+ /* This will be a problem when we run the loop another
+ time, but this is the only iteration. */
+ n =3D stringlen;
+ }
+ else
+ {
+ /* Identify a run of glyphs with the same face. */
+ local_face_id =3D string->face_id;
=20
=2D /* Turn appearance modes of the face of the run on. */
=2D tty_highlight_if_desired (tty);
=2D turn_on_face (f, face_id);
+ for (n =3D 1; n < stringlen; ++n)
+ if (string[n].face_id !=3D local_face_id)
+ break;
+
+ /* Turn appearance modes of the face of the run on. */
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, local_face_id);
+ }
=20
if (n =3D=3D stringlen && !write_on_last_cell)
/* This is the last run. */
@@ -799,24 +818,41 @@ tty_write_glyphs (struct frame *f, struct glyph *stri=
ng, int len)
}
string +=3D n;
=20
=2D /* Turn appearance modes off. */
=2D turn_off_face (f, face_id);
=2D tty_turn_off_highlight (tty);
+ if (face_id < 0)
+ {
+ /* Turn appearance modes off. */
+ turn_off_face (f, local_face_id);
+ tty_turn_off_highlight (tty);
+ }
}
}
=20
/* Write on the bottom-right corner. */
if (write_on_last_cell)
{
=2D /* Go to the previous position. */
+ /* The algorithm here is: we write the whole string except the
+ last glyph, then move back to the beginning of previous
+ glyph, write the last glyph, move back again, and insert the
+ glyph before the last glyph in such a way that last glyph at
+ cursor' position gets pushed to the corner. */
+
+ /* Go to the beginning of previous glyph. */
+ /* BUG: This assume the previous glyph is a single column width
+ glyph, so this won't work for multi column width, and the
+ result is terminal-dependent. */
cmgoto (tty, curY (tty), curX (tty) - 1);
cmplus (tty, 1);
=20
=2D int face_id =3D string->face_id;
+ int local_face_id;
=20
=2D /* Turn appearance modes of the face. */
=2D tty_highlight_if_desired (tty);
=2D turn_on_face (f, face_id);
+ if (face_id < 0)
+ {
+ local_face_id =3D string->face_id;
+
+ /* Turn appearance modes of the face. */
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, local_face_id);
+ }
=20
conversion_buffer =3D encode_terminal_code (string, 1, coding);
if (coding->produced > 0)
@@ -831,12 +867,15 @@ tty_write_glyphs (struct frame *f, struct glyph *stri=
ng, int len)
unblock_input ();
}
=20
=2D /* Go to the previous position. */
+ /* Go to the beginning of previous glyph. */
+ /* BUG: This assume the previous glyph is a single column width
+ glyph, so this won't work for multi column width, and the
+ result is terminal-dependent. */
cmgoto (tty, curY (tty), curX (tty) - 1);
cmplus (tty, 1);
=20
/* Arrange that after writing the next glyph, the glyph on the
=2D current character cell is somehow pushed to the bottom-right
+ current character cell gets pushed to the bottom-right
corner. */
if (tty->TS_ins_char)
{
@@ -854,17 +893,18 @@ tty_write_glyphs (struct frame *f, struct glyph *stri=
ng, int len)
tty_turn_on_insert (tty);
}
=20
=2D if (face_id !=3D glyph_on_char_cell_before_last.face_id)
+ if (face_id < 0
+ && local_face_id !=3D glyph_on_char_cell_before_last.face_id)
{
=20
/* Turn appearance modes of the face. */
=2D turn_off_face (f, face_id);
+ turn_off_face (f, local_face_id);
tty_turn_off_highlight (tty);
=20
=2D face_id =3D glyph_on_char_cell_before_last.face_id;
+ local_face_id =3D glyph_on_char_cell_before_last.face_id;
=20
tty_highlight_if_desired (tty);
=2D turn_on_face (f, face_id);
+ turn_on_face (f, local_face_id);
}
=20
/* This is the last run. */
@@ -884,157 +924,32 @@ tty_write_glyphs (struct frame *f, struct glyph *str=
ing, int len)
unblock_input ();
}
=20
+ if (face_id < 0)
+ {
+ /* Turn appearance modes off. */
+ turn_off_face (f, local_face_id);
+ tty_turn_off_highlight (tty);
+ }
+
+ tty_turn_off_insert (tty);
+ }
+
+ if (face_id >=3D 0)
+ {
/* Turn appearance modes off. */
turn_off_face (f, face_id);
tty_turn_off_highlight (tty);
=2D
=2D tty_turn_off_insert (tty);
}
=20
cmcheckmagic (tty);
}
=20
=2D#ifndef DOS_NT
=2D
static void
=2Dtty_write_glyphs_with_face (register struct frame *f, register struct gl=
yph *string,
=2D register int len, register int face_id)
+tty_write_glyphs (struct frame *f, struct glyph *string, int len)
{
=2D unsigned char *conversion_buffer;
=2D struct coding_system *coding;
=2D int write_on_last_cell;
=2D
=2D struct tty_display_info *tty =3D FRAME_TTY (f);
=2D
=2D tty_turn_off_insert (tty);
=2D tty_hide_cursor (tty);
=2D
=2D /* Don't dare write in last column of bottom line, if Auto-Wrap,
=2D since that would scroll the whole frame on some terminals. */
=2D
=2D write_on_last_cell =3D (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f));
=2D if (write_on_last_cell)
=2D len --;
=2D
=2D if (FRAME_COLS (f) =3D=3D 1
=2D || !(tty->TS_ins_char || tty->TS_ins_multi_chars
=2D || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
=2D write_on_last_cell =3D false;
=2D
=2D if (len <=3D 0 && !write_on_last_cell)
=2D return;
=2D
=2D /* If terminal_coding does any conversion, use it, otherwise use
=2D safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
=2D because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
=2D & CODING_REQUIRE_ENCODING_MASK)
=2D ? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
=2D
=2D /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only
=2D at the tail. */
=2D coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=2D
=2D /* Turn appearance modes of the face. */
=2D tty_highlight_if_desired (tty);
=2D turn_on_face (f, face_id);
=2D
=2D if (len > 0)
=2D {
=2D cmplus (tty, len);
=2D if (write_on_last_cell)
=2D glyph_on_char_cell_before_last =3D string[len - 1];
=2D else
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D
=2D conversion_buffer =3D encode_terminal_code (string, len, coding);
=2D if (coding->produced > 0)
=2D {
=2D block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced,
=2D tty->output);
=2D clearerr (tty->output);
=2D if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced,
=2D tty->termscript);
=2D unblock_input ();
=2D }
=2D }
=2D
=2D /* Write on the bottom-right corner. */
=2D if (write_on_last_cell)
=2D {
=2D /* Go to the previous position. */
=2D cmgoto (tty, curY (tty), curX (tty) - 1);
=2D cmplus (tty, 1);
=2D
=2D conversion_buffer =3D encode_terminal_code (string, 1, coding);
=2D if (coding->produced > 0)
=2D {
=2D block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced,
=2D tty->output);
=2D clearerr (tty->output);
=2D if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced,
=2D tty->termscript);
=2D unblock_input ();
=2D }
=2D
=2D /* Go to the previous position. */
=2D cmgoto (tty, curY (tty), curX (tty) - 1);
=2D cmplus (tty, 1);
=2D
=2D /* Arrange that after writing the next glyph, the glyph on the
=2D current character cell is somehow pushed to the bottom-right
=2D corner. */
=2D if (tty->TS_ins_char)
=2D {
=2D OUTPUT1 (tty, tty->TS_ins_char);
=2D }
=2D else if (tty->TS_ins_multi_chars)
=2D {
=2D char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1,
=2D 0, 0, 0);
=2D OUTPUT1 (tty, buf);
=2D xfree (buf);
=2D }
=2D else
=2D {
=2D tty_turn_on_insert (tty);
=2D }
=2D
=2D /* This is the last run. */
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer
=2D =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
=2D coding);
=2D if (coding->produced > 0)
=2D {
=2D block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced,
=2D tty->output);
=2D clearerr (tty->output);
=2D if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced,
=2D tty->termscript);
=2D unblock_input ();
=2D }
=2D
=2D tty_turn_off_insert (tty);
=2D }
=2D
=2D /* Turn appearance modes off. */
=2D turn_off_face (f, face_id);
=2D tty_turn_off_highlight (tty);
=2D
=2D cmcheckmagic (tty);
+ tty_write_glyphs_1 (f, string, len, -1);
}
=20
=2D#endif
=2D
/* An implementation of insert_glyphs for termcap frames. */
=20
static void
@@ -2615,8 +2530,8 @@ tty_draw_row_with_mouse_face (struct window *w, struc=
t glyph_row *row,
cursor_to (f, pos_y, pos_x);
=20
if (draw =3D=3D DRAW_MOUSE_FACE)
=2D tty_write_glyphs_with_face (f, row->glyphs[TEXT_AREA] + start_hpos,
=2D nglyphs, face_id);
+ tty_write_glyphs_1 (f, row->glyphs[TEXT_AREA] + start_hpos,
+ nglyphs, face_id);
else if (draw =3D=3D DRAW_NORMAL_TEXT)
write_glyphs (f, row->glyphs[TEXT_AREA] + start_hpos, nglyphs);
=20
=2D-=20
2.37.1
--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
This message is signed by me with my GnuPG key. Its fingerprint is:
7001 8CE5 819F 17A3 BBA6 66AF E74F 0EFA 922A E7F5
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bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Received: (at 57607) by debbugs.gnu.org; 4 Oct 2022 12:55:31 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Oct 04 08:55:31 2022 Received: from localhost ([127.0.0.1]:52883 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ofhSN-0003Xo-3s for submit <at> debbugs.gnu.org; Tue, 04 Oct 2022 08:55:31 -0400 Received: from eggs.gnu.org ([209.51.188.92]:40874) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1ofhSK-0003Xa-Ma for 57607 <at> debbugs.gnu.org; Tue, 04 Oct 2022 08:55:29 -0400 Received: from fencepost.gnu.org ([209.51.188.10]:52748) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1ofhSD-0002hm-BN; Tue, 04 Oct 2022 08:55:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=y7ZhKZ3unenz3lRaoR6qAr7WIOrl+lVlD9BwAQrbx9Y=; b=hH6YzYh7XASl /WhwiPv+QGKAw6yh+QLfXvs3Y/PkzAXd7gjqHvXdzhTdlWIjAGJA+wTbP0C/QIKIWdWFig5peREzk sSLhwRH3AUEsQFR2a+JnBg+G8e0p1OqwTZ2W9aZMumhikKhqLtVy3Wq5dW8JidodkTdELNAQz3wIZ GeqMUAdrPTxtYZSV1fwCqQ8qBGAWFafIK8qNNG0UNT2iZthDJpN9q9jq40AisyjuUnAPKaAJlq5BM Ohaw+aBV9copzePEHOFWXOr85KhiUH322bJcKgrqPn3H4fHrSc7vBiYt8TVNoACVRxOJBn+eLypCv v8wgh0VnsMOqSWhwPCjKfQ==; Received: from [87.69.77.57] (port=1725 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1ofhS5-0007yi-Lx; Tue, 04 Oct 2022 08:55:20 -0400 Date: Tue, 04 Oct 2022 15:54:48 +0300 Message-Id: <83o7urvjdz.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> In-Reply-To: <87lepver2e.fsf@HIDDEN> (message from Akib Azmain Turja on Tue, 04 Oct 2022 18:00:57 +0600) Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN> <m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN> <87r0zpi9za.fsf@HIDDEN> <83y1twwv7w.fsf@HIDDEN> <87edvohx2s.fsf@HIDDEN> <83a66cvwob.fsf@HIDDEN> <87lepver2e.fsf@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 57607 Cc: gerd.moellmann@HIDDEN, 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > From: Akib Azmain Turja <akib@HIDDEN> > Cc: 57607 <at> debbugs.gnu.org, gerd.moellmann@HIDDEN > Date: Tue, 04 Oct 2022 18:00:57 +0600 > > > Please try with some 2-column CJK characters, I'm not sure the example > > with ^L is relevant here. You can find the list of wide characters in > > characters.el (search for "width"); for example, characters in the > > U+FF00 block can be useful. > > Thanks, "CJK STROKE D" doesn't work as expected, and the result depends > on terminal in use. How can I determine the width of a glyph? Like this: (char-width CHAR) where CHAR is the character you are interested in. For example: (char-width #x31D4) => 2 From C, you can call char_width, like Fchar_width (which see) does. One other subtle point: the argument STRING to tty_write_glyphs is a string of 'struct glyph' objects, not a string of characters. Each struct glyph has the code of the character to display in its u.ch member, if the glyph is a simple character glyph; for the full story see encode_terminal_code. > > (And the existing code could have bugs, > > no need to assume it is always correct.) > > Yes, it can, but in most cases, my brain has more bugs. Indeed, that the existing code has bugs should not be our first hypothesis. But it shouldn't be axiomatic that there are no bugs there ;-) > > face_id is an integer, and zero is a valid value (it means the default > > face), so NULL won't do. But you can use -1 to mean "no face ID". > > Just make sure you never pass it to FACE_FROM_ID etc. > > > > Thanks. > > OK, I'll try that. Thanks. TIA
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <83a66cvwob.fsf@HIDDEN> (Eli Zaretskii's message of "Tue, 04 Oct
2022 11:07:48 +0300")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
<m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN>
<m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN>
<m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN>
<87r0zpi9za.fsf@HIDDEN> <83y1twwv7w.fsf@HIDDEN>
<87edvohx2s.fsf@HIDDEN> <83a66cvwob.fsf@HIDDEN>
Date: Tue, 04 Oct 2022 18:00:57 +0600
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Eli Zaretskii <eliz@HIDDEN> writes:
>> From: Akib Azmain Turja <akib@HIDDEN>
>> Cc: 57607 <at> debbugs.gnu.org, gerd.moellmann@HIDDEN
>> Date: Tue, 04 Oct 2022 13:22:51 +0600
>>=20
>> > Thanks. But could you please describe the idea of the patch in some
>> > comment? It is hard to follow the code, especially since the diff has
>> > many pure whitespace changes.
>>=20
>> The idea is that you write the string just like before (for example, you
>> want to write "hello" in a five columns width terminal, so you write
>> only "hell", so that the line shows "hell "), then move a character
>> backward and write the last glyph (write "o", so that the line shows
>> "helo "), move a character backward again and arrange that after writing
>> the next glyph, the character on the current position will be pushed
>> towards right and write the glyph before the last one (write "l", now
>> the line shows "hello").
>>=20
>> Should I add the explanation to the function as comment?
>
> Yes, please. It would also help if the respective parts of the code
> were annotated with comments that explain their role in the algorithm.
OK.
>
>> > Also, this:
>> >
>> >> + /* Go to the previous position. */
>> >> + cmgoto (tty, curY (tty), curX (tty) - 1);
>> >> + cmplus (tty, 1);
>> >
>> > Seem to assume the last character takes just one column? What about
>> > characters whose width is 2 columns?
>>=20
>> Yes, I assume that. I don't think any multi-char width glyph reach this
>> function (I think they are converted to single column width glyphs, for
>> example "^L" is converted to "^" and "L"). The reason of the assumption
>> is the following code:
>>=20
>> --8<---------------cut here---------------start------------->8---
>> if (AutoWrap (tty)
>> && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
>> && (curX (tty) + len) =3D=3D FRAME_COLS (f))
>> len --;
>> --8<---------------cut here---------------end--------------->8---
>>=20
>> Which also assumes the same.
>
> Please try with some 2-column CJK characters, I'm not sure the example
> with ^L is relevant here. You can find the list of wide characters in
> characters.el (search for "width"); for example, characters in the
> U+FF00 block can be useful.
Thanks, "CJK STROKE D" doesn't work as expected, and the result depends
on terminal in use. How can I determine the width of a glyph?
> (And the existing code could have bugs,
> no need to assume it is always correct.)
Yes, it can, but in most cases, my brain has more bugs.
>
>> > And finally, it would be nice to avoid so much code duplication
>> > between tty_write_glyphs and tty_write_glyphs_with_face. Is that
>> > feasible?
>>=20
>> Yes, I think so. I think it possible to just add a new argument
>> "face_id" to tty_write_glyphs would the trick. tty_write_glyph will try
>> to use "face_id" if it is specified, otherwise fallback to the face_id
>> in the string. But how to "not" specify a face_id? Would a NULL work?
>
> face_id is an integer, and zero is a valid value (it means the default
> face), so NULL won't do. But you can use -1 to mean "no face ID".
> Just make sure you never pass it to FACE_FROM_ID etc.
>
> Thanks.
OK, I'll try that. Thanks.
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
This message is signed by me with my GnuPG key. Its fingerprint is:
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bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Received: (at 57607) by debbugs.gnu.org; 4 Oct 2022 08:08:00 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Oct 04 04:08:00 2022 Received: from localhost ([127.0.0.1]:52369 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ofcy7-0005oq-V5 for submit <at> debbugs.gnu.org; Tue, 04 Oct 2022 04:08:00 -0400 Received: from eggs.gnu.org ([209.51.188.92]:45678) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1ofcy6-0005od-QY for 57607 <at> debbugs.gnu.org; Tue, 04 Oct 2022 04:07:59 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:40374) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1ofcy1-000692-IA; Tue, 04 Oct 2022 04:07:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=Yij1z8lYqDxuHGvy6OAkoOoVDZ1TJaNt3Xz1Oj1zAW8=; b=pMnPsXvo3LsD jP8BOySQzIiykmuGRQaafcZOzRDj8gY4i8kFujfHy6ePIGG4ZKGiNjUY2CE09pc5ap6iXCdBThRV/ 5xbas3jgRzLWxENmJcDeFWR6wR5xJdEnumuQuvYOxwaL+929PG+Kfw7gl3kf7fDPEqNUNNfF6/Yul 22xalRGF5LpZ4Oe5zhdHnLisuz5A4YRjPhdTokp+s+tjZDtP5E5xKf4qYHajav3YvnVFO1/fdON3a U1oefdk3TYrZjRrMXZfOJF++r3Jg+qevIy7fx15enOxxuri9etdBeqFtaxy3eKIjE6e1u7YcayRkG 8xlVMvbyUIo2D+27dKxNRw==; Received: from [87.69.77.57] (port=3719 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1ofcy1-0004kD-1n; Tue, 04 Oct 2022 04:07:53 -0400 Date: Tue, 04 Oct 2022 11:07:48 +0300 Message-Id: <83a66cvwob.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> In-Reply-To: <87edvohx2s.fsf@HIDDEN> (message from Akib Azmain Turja on Tue, 04 Oct 2022 13:22:51 +0600) Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN> <m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN> <87r0zpi9za.fsf@HIDDEN> <83y1twwv7w.fsf@HIDDEN> <87edvohx2s.fsf@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 57607 Cc: gerd.moellmann@HIDDEN, 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > From: Akib Azmain Turja <akib@HIDDEN> > Cc: 57607 <at> debbugs.gnu.org, gerd.moellmann@HIDDEN > Date: Tue, 04 Oct 2022 13:22:51 +0600 > > > Thanks. But could you please describe the idea of the patch in some > > comment? It is hard to follow the code, especially since the diff has > > many pure whitespace changes. > > The idea is that you write the string just like before (for example, you > want to write "hello" in a five columns width terminal, so you write > only "hell", so that the line shows "hell "), then move a character > backward and write the last glyph (write "o", so that the line shows > "helo "), move a character backward again and arrange that after writing > the next glyph, the character on the current position will be pushed > towards right and write the glyph before the last one (write "l", now > the line shows "hello"). > > Should I add the explanation to the function as comment? Yes, please. It would also help if the respective parts of the code were annotated with comments that explain their role in the algorithm. > > Also, this: > > > >> + /* Go to the previous position. */ > >> + cmgoto (tty, curY (tty), curX (tty) - 1); > >> + cmplus (tty, 1); > > > > Seem to assume the last character takes just one column? What about > > characters whose width is 2 columns? > > Yes, I assume that. I don't think any multi-char width glyph reach this > function (I think they are converted to single column width glyphs, for > example "^L" is converted to "^" and "L"). The reason of the assumption > is the following code: > > --8<---------------cut here---------------start------------->8--- > if (AutoWrap (tty) > && curY (tty) + 1 == FRAME_TOTAL_LINES (f) > && (curX (tty) + len) == FRAME_COLS (f)) > len --; > --8<---------------cut here---------------end--------------->8--- > > Which also assumes the same. Please try with some 2-column CJK characters, I'm not sure the example with ^L is relevant here. You can find the list of wide characters in characters.el (search for "width"); for example, characters in the U+FF00 block can be useful. (And the existing code could have bugs, no need to assume it is always correct.) > > And finally, it would be nice to avoid so much code duplication > > between tty_write_glyphs and tty_write_glyphs_with_face. Is that > > feasible? > > Yes, I think so. I think it possible to just add a new argument > "face_id" to tty_write_glyphs would the trick. tty_write_glyph will try > to use "face_id" if it is specified, otherwise fallback to the face_id > in the string. But how to "not" specify a face_id? Would a NULL work? face_id is an integer, and zero is a valid value (it means the default face), so NULL won't do. But you can use -1 to mean "no face ID". Just make sure you never pass it to FACE_FROM_ID etc. Thanks.
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <83y1twwv7w.fsf@HIDDEN> (Eli Zaretskii's message of "Mon, 03 Oct
2022 22:41:39 +0300")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
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Date: Tue, 04 Oct 2022 13:22:51 +0600
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Eli Zaretskii <eliz@HIDDEN> writes:
>> Cc: gerd.moellmann@HIDDEN
>> Date: Mon, 03 Oct 2022 14:31:53 +0600
>> From: Akib Azmain Turja via "Bug reports for GNU Emacs,
>> the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>>=20
>> I have implemented it. Implementing it was easier than I thought. Here
>> is the patch:
>
> Thanks. But could you please describe the idea of the patch in some
> comment? It is hard to follow the code, especially since the diff has
> many pure whitespace changes.
The idea is that you write the string just like before (for example, you
want to write "hello" in a five columns width terminal, so you write
only "hell", so that the line shows "hell "), then move a character
backward and write the last glyph (write "o", so that the line shows
"helo "), move a character backward again and arrange that after writing
the next glyph, the character on the current position will be pushed
towards right and write the glyph before the last one (write "l", now
the line shows "hello").
Should I add the explanation to the function as comment?
>
> Also, this:
>
>> + /* Go to the previous position. */
>> + cmgoto (tty, curY (tty), curX (tty) - 1);
>> + cmplus (tty, 1);
>
> Seem to assume the last character takes just one column? What about
> characters whose width is 2 columns?
Yes, I assume that. I don't think any multi-char width glyph reach this
function (I think they are converted to single column width glyphs, for
example "^L" is converted to "^" and "L"). The reason of the assumption
is the following code:
=2D-8<---------------cut here---------------start------------->8---
if (AutoWrap (tty)
&& curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
&& (curX (tty) + len) =3D=3D FRAME_COLS (f))
len --;
=2D-8<---------------cut here---------------end--------------->8---
Which also assumes the same.
>
> And finally, it would be nice to avoid so much code duplication
> between tty_write_glyphs and tty_write_glyphs_with_face. Is that
> feasible?
Yes, I think so. I think it possible to just add a new argument
"face_id" to tty_write_glyphs would the trick. tty_write_glyph will try
to use "face_id" if it is specified, otherwise fallback to the face_id
in the string. But how to "not" specify a face_id? Would a NULL work?
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
This message is signed by me with my GnuPG key. Its fingerprint is:
7001 8CE5 819F 17A3 BBA6 66AF E74F 0EFA 922A E7F5
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--=-=-=--
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Received: (at 57607) by debbugs.gnu.org; 3 Oct 2022 19:41:54 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Oct 03 15:41:54 2022 Received: from localhost ([127.0.0.1]:51752 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ofRK6-0001PC-7i for submit <at> debbugs.gnu.org; Mon, 03 Oct 2022 15:41:54 -0400 Received: from eggs.gnu.org ([209.51.188.92]:33032) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1ofRK4-0001Ox-0a for 57607 <at> debbugs.gnu.org; Mon, 03 Oct 2022 15:41:53 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:49670) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1ofRJy-0005Ct-Pw; Mon, 03 Oct 2022 15:41:46 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=5vUdb6fdIrdmCO0yY4k7NXVfwXO2JiLytfYpu4e5f8U=; b=POl+jZe89GV+ 8gyzASKSnaZ99M09/j4wC+1YR1xSraLH7s6giC/URAUjYtbskHLwLqNjnfT3QV8YcOv5FLUQP81ls GmSFuRJkbn6Gw8bWkbqS4UZpPiPEezC5GCnrJ6PSAvBT0BfYg81yyZIpxAKA2/17bum0jtgfPp99n QeXFYbb1FFrRIwhMLTaeqqJajl6vqAWjQrW/9QiE6dwLNKHyNGMArSwCWhsRcypciiS2hkR3Az2/a R+gwXwDDMR2/eE+8ppg0rtN107gBvnJlbd0m27pIQY3cdiNyj4zM2GcdRymKquCqcaYPiGymVBbp7 HwN4vIWMxiv5J6uIP53hQw==; Received: from [87.69.77.57] (port=1433 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1ofRJx-0002wR-KB; Mon, 03 Oct 2022 15:41:46 -0400 Date: Mon, 03 Oct 2022 22:41:39 +0300 Message-Id: <83y1twwv7w.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> In-Reply-To: <87r0zpi9za.fsf@HIDDEN> (bug-gnu-emacs@HIDDEN) Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN> <m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN> <87r0zpi9za.fsf@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 57607 Cc: gerd.moellmann@HIDDEN, 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > Cc: gerd.moellmann@HIDDEN > Date: Mon, 03 Oct 2022 14:31:53 +0600 > From: Akib Azmain Turja via "Bug reports for GNU Emacs, > the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN> > > I have implemented it. Implementing it was easier than I thought. Here > is the patch: Thanks. But could you please describe the idea of the patch in some comment? It is hard to follow the code, especially since the diff has many pure whitespace changes. Also, this: > + /* Go to the previous position. */ > + cmgoto (tty, curY (tty), curX (tty) - 1); > + cmplus (tty, 1); Seem to assume the last character takes just one column? What about characters whose width is 2 columns? And finally, it would be nice to avoid so much code duplication between tty_write_glyphs and tty_write_glyphs_with_face. Is that feasible?
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: Akib Azmain Turja via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <87tu5i9kbg.fsf@HIDDEN> (Akib Azmain Turja via's message of
"Thu, 08 Sep 2022 17:28:35 +0600")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
<m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN>
<m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN>
<m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN>
Date: Mon, 03 Oct 2022 14:31:53 +0600
Message-ID: <87r0zpi9za.fsf@HIDDEN>
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Akib Azmain Turja via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@HIDDEN> writes:
> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> Akib Azmain Turja <akib@HIDDEN> writes:
>>
>>> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>>>
>>> I mean, what files to change in order to do this? I think it's
>>> tty_write_glyphs and tty_write_glyphs_with_face in term.c.
>>
>> Are you interested in implementing something? You could re-open this
>> bug then, no problem. Or are you maybe just evaluating if you'd like to
>> do it? Please give a hint.
>
> Yes, I'm interested, because I think it would help me understand how
> Emacs renders text in terminal, which would help me to implement child
> frame in terminal. But I don't have the time to do it right now. I
> hope I can start doing this by late October.
>
I have implemented it. Implementing it was easier than I thought. Here
is the patch:
--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline;
filename=0001-Write-on-the-bottom-right-character-cell-on-terminal.patch
Content-Transfer-Encoding: quoted-printable
Content-Description: Patch
From=2072af00d8610bdc194062b246aab0e38f22174aeb Mon Sep 17 00:00:00 2001
From: Akib Azmain Turja <akib@HIDDEN>
Date: Mon, 3 Oct 2022 14:18:59 +0600
Subject: [PATCH] Write on the bottom-right character cell on terminal
Correctly write on the bottom-right character cell on text terminals
if the terminal allows to do this. Also fixes bug#57728.
* src/term.c (tty_write_glyphs, tty_write_glyphs_with_face): Write on
the bottom-right character cell if the terminal supports it.
* src/term.c (glyph_on_char_cell_before_last): New static variable to
hold the current glyph on the character cell before the cell on the
bottom-right corner.
=2D--
src/term.c | 266 ++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 225 insertions(+), 41 deletions(-)
diff --git a/src/term.c b/src/term.c
index 2e43d892..283a65c4 100644
=2D-- a/src/term.c
+++ b/src/term.c
@@ -718,7 +718,7 @@ encode_terminal_code (struct glyph *src, int src_len,
return (encode_terminal_dst);
}
=20
=2D
+static struct glyph glyph_on_char_cell_before_last;
=20
/* An implementation of write_glyphs for termcap frames. */
=20
@@ -727,7 +727,7 @@ tty_write_glyphs (struct frame *f, struct glyph *string=
, int len)
{
unsigned char *conversion_buffer;
struct coding_system *coding;
=2D int n, stringlen;
+ int n, stringlen, write_on_last_cell;
=20
struct tty_display_info *tty =3D FRAME_TTY (f);
=20
@@ -737,55 +737,158 @@ tty_write_glyphs (struct frame *f, struct glyph *str=
ing, int len)
/* Don't dare write in last column of bottom line, if Auto-Wrap,
since that would scroll the whole frame on some terminals. */
=20
=2D if (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f))
+ write_on_last_cell =3D (AutoWrap (tty)
+ && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
+ && (curX (tty) + len) =3D=3D FRAME_COLS (f));
+ if (write_on_last_cell)
len --;
=2D if (len <=3D 0)
=2D return;
=20
=2D cmplus (tty, len);
+ if (FRAME_COLS (f) =3D=3D 1
+ || !(tty->TS_ins_char || tty->TS_ins_multi_chars
+ || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
+ write_on_last_cell =3D false;
+
+ if (len <=3D 0 && !write_on_last_cell)
+ return;
=20
/* If terminal_coding does any conversion, use it, otherwise use
safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_E=
NCODING_MASK
+ coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
+ & CODING_REQUIRE_ENCODING_MASK)
? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
/* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
=2D for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
+ if (len > 0)
{
=2D /* Identify a run of glyphs with the same face. */
=2D int face_id =3D string->face_id;
+ cmplus (tty, len);
+
+ if (write_on_last_cell)
+ glyph_on_char_cell_before_last =3D string[len - 1];
+
+ for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
+ {
+ /* Identify a run of glyphs with the same face. */
+ int face_id =3D string->face_id;
+
+ for (n =3D 1; n < stringlen; ++n)
+ if (string[n].face_id !=3D face_id)
+ break;
+
+ /* Turn appearance modes of the face of the run on. */
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
=20
=2D for (n =3D 1; n < stringlen; ++n)
=2D if (string[n].face_id !=3D face_id)
=2D break;
+ if (n =3D=3D stringlen && !write_on_last_cell)
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer =3D encode_terminal_code (string, n,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+ string +=3D n;
=20
=2D /* Turn appearance modes of the face of the run on. */
+ /* Turn appearance modes off. */
+ turn_off_face (f, face_id);
+ tty_turn_off_highlight (tty);
+ }
+ }
+
+ /* Write on the bottom-right corner. */
+ if (write_on_last_cell)
+ {
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ int face_id =3D string->face_id;
+
+ /* Turn appearance modes of the face. */
tty_highlight_if_desired (tty);
turn_on_face (f, face_id);
=20
=2D if (n =3D=3D stringlen)
=2D /* This is the last run. */
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer =3D encode_terminal_code (string, n, coding);
+ conversion_buffer =3D encode_terminal_code (string, 1, coding);
if (coding->produced > 0)
{
block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced, tty->output);
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
clearerr (tty->output);
if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ /* Arrange that after writing the next glyph, the glyph on the
+ current character cell is somehow pushed to the bottom-right
+ corner. */
+ if (tty->TS_ins_char)
+ {
+ OUTPUT1 (tty, tty->TS_ins_char);
+ }
+ else if (tty->TS_ins_multi_chars)
+ {
+ char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1, 0,
+ 0, 0);
+ OUTPUT1 (tty, buf);
+ xfree (buf);
+ }
+ else
+ {
+ tty_turn_on_insert (tty);
+ }
+
+ if (face_id !=3D glyph_on_char_cell_before_last.face_id)
+ {
+
+ /* Turn appearance modes of the face. */
+ turn_off_face (f, face_id);
+ tty_turn_off_highlight (tty);
+
+ face_id =3D glyph_on_char_cell_before_last.face_id;
+
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
+ }
+
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer
+ =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
unblock_input ();
}
=2D string +=3D n;
=20
/* Turn appearance modes off. */
turn_off_face (f, face_id);
tty_turn_off_highlight (tty);
+
+ tty_turn_off_insert (tty);
}
=20
cmcheckmagic (tty);
@@ -799,6 +902,7 @@ tty_write_glyphs_with_face (register struct frame *f, r=
egister struct glyph *str
{
unsigned char *conversion_buffer;
struct coding_system *coding;
+ int write_on_last_cell;
=20
struct tty_display_info *tty =3D FRAME_TTY (f);
=20
@@ -808,38 +912,118 @@ tty_write_glyphs_with_face (register struct frame *f=
, register struct glyph *str
/* Don't dare write in last column of bottom line, if Auto-Wrap,
since that would scroll the whole frame on some terminals. */
=20
=2D if (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f))
+ write_on_last_cell =3D (AutoWrap (tty)
+ && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
+ && (curX (tty) + len) =3D=3D FRAME_COLS (f));
+ if (write_on_last_cell)
len --;
=2D if (len <=3D 0)
=2D return;
=20
=2D cmplus (tty, len);
+ if (FRAME_COLS (f) =3D=3D 1
+ || !(tty->TS_ins_char || tty->TS_ins_multi_chars
+ || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
+ write_on_last_cell =3D false;
+
+ if (len <=3D 0 && !write_on_last_cell)
+ return;
=20
/* If terminal_coding does any conversion, use it, otherwise use
safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_E=
NCODING_MASK
+ coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
+ & CODING_REQUIRE_ENCODING_MASK)
? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
=2D /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
=2D the tail. */
+
+ /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only
+ at the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
/* Turn appearance modes of the face. */
tty_highlight_if_desired (tty);
turn_on_face (f, face_id);
=20
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer =3D encode_terminal_code (string, len, coding);
=2D if (coding->produced > 0)
+ if (len > 0)
+ {
+ cmplus (tty, len);
+ if (write_on_last_cell)
+ glyph_on_char_cell_before_last =3D string[len - 1];
+ else
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+
+ conversion_buffer =3D encode_terminal_code (string, len, coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+ }
+
+ /* Write on the bottom-right corner. */
+ if (write_on_last_cell)
{
=2D block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced, tty->output);
=2D clearerr (tty->output);
=2D if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
=2D unblock_input ();
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ conversion_buffer =3D encode_terminal_code (string, 1, coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ /* Arrange that after writing the next glyph, the glyph on the
+ current character cell is somehow pushed to the bottom-right
+ corner. */
+ if (tty->TS_ins_char)
+ {
+ OUTPUT1 (tty, tty->TS_ins_char);
+ }
+ else if (tty->TS_ins_multi_chars)
+ {
+ char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1,
+ 0, 0, 0);
+ OUTPUT1 (tty, buf);
+ xfree (buf);
+ }
+ else
+ {
+ tty_turn_on_insert (tty);
+ }
+
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer
+ =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ tty_turn_off_insert (tty);
}
=20
/* Turn appearance modes off. */
=2D-=20
2.37.1
--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable
>>
>> The places you mention sound right. It's probably all in term.c. But
>> I'd like to add, that in principle all places writing to the terminal
>> have to be checked at least.
>>
>> And corner cases have to be taken into consideration :-). Pulling
>> something out of thin air: What happens if we write RGRG to the
>> bottom-right corner, where R is one red char, and G is 1 green char,
>> say.
I tried "RGRG\", where "R" is red, "G" is green, and "\" is the (white)
continuation glyph. Looks like this patch also fixes bug#57728.
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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To: Akib Azmain Turja via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <87tu5i9kbg.fsf@HIDDEN> (Akib Azmain Turja via's message of
"Thu, 08 Sep 2022 17:28:35 +0600")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
<m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN>
<m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN>
<m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN>
Date: Mon, 03 Oct 2022 14:31:53 +0600
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Akib Azmain Turja via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@HIDDEN> writes:
> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> Akib Azmain Turja <akib@HIDDEN> writes:
>>
>>> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>>>
>>> I mean, what files to change in order to do this? I think it's
>>> tty_write_glyphs and tty_write_glyphs_with_face in term.c.
>>
>> Are you interested in implementing something? You could re-open this
>> bug then, no problem. Or are you maybe just evaluating if you'd like to
>> do it? Please give a hint.
>
> Yes, I'm interested, because I think it would help me understand how
> Emacs renders text in terminal, which would help me to implement child
> frame in terminal. But I don't have the time to do it right now. I
> hope I can start doing this by late October.
>
I have implemented it. Implementing it was easier than I thought. Here
is the patch:
--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline;
filename=0001-Write-on-the-bottom-right-character-cell-on-terminal.patch
Content-Transfer-Encoding: quoted-printable
Content-Description: Patch
From=2072af00d8610bdc194062b246aab0e38f22174aeb Mon Sep 17 00:00:00 2001
From: Akib Azmain Turja <akib@HIDDEN>
Date: Mon, 3 Oct 2022 14:18:59 +0600
Subject: [PATCH] Write on the bottom-right character cell on terminal
Correctly write on the bottom-right character cell on text terminals
if the terminal allows to do this. Also fixes bug#57728.
* src/term.c (tty_write_glyphs, tty_write_glyphs_with_face): Write on
the bottom-right character cell if the terminal supports it.
* src/term.c (glyph_on_char_cell_before_last): New static variable to
hold the current glyph on the character cell before the cell on the
bottom-right corner.
=2D--
src/term.c | 266 ++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 225 insertions(+), 41 deletions(-)
diff --git a/src/term.c b/src/term.c
index 2e43d892..283a65c4 100644
=2D-- a/src/term.c
+++ b/src/term.c
@@ -718,7 +718,7 @@ encode_terminal_code (struct glyph *src, int src_len,
return (encode_terminal_dst);
}
=20
=2D
+static struct glyph glyph_on_char_cell_before_last;
=20
/* An implementation of write_glyphs for termcap frames. */
=20
@@ -727,7 +727,7 @@ tty_write_glyphs (struct frame *f, struct glyph *string=
, int len)
{
unsigned char *conversion_buffer;
struct coding_system *coding;
=2D int n, stringlen;
+ int n, stringlen, write_on_last_cell;
=20
struct tty_display_info *tty =3D FRAME_TTY (f);
=20
@@ -737,55 +737,158 @@ tty_write_glyphs (struct frame *f, struct glyph *str=
ing, int len)
/* Don't dare write in last column of bottom line, if Auto-Wrap,
since that would scroll the whole frame on some terminals. */
=20
=2D if (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f))
+ write_on_last_cell =3D (AutoWrap (tty)
+ && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
+ && (curX (tty) + len) =3D=3D FRAME_COLS (f));
+ if (write_on_last_cell)
len --;
=2D if (len <=3D 0)
=2D return;
=20
=2D cmplus (tty, len);
+ if (FRAME_COLS (f) =3D=3D 1
+ || !(tty->TS_ins_char || tty->TS_ins_multi_chars
+ || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
+ write_on_last_cell =3D false;
+
+ if (len <=3D 0 && !write_on_last_cell)
+ return;
=20
/* If terminal_coding does any conversion, use it, otherwise use
safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_E=
NCODING_MASK
+ coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
+ & CODING_REQUIRE_ENCODING_MASK)
? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
/* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
=2D for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
+ if (len > 0)
{
=2D /* Identify a run of glyphs with the same face. */
=2D int face_id =3D string->face_id;
+ cmplus (tty, len);
+
+ if (write_on_last_cell)
+ glyph_on_char_cell_before_last =3D string[len - 1];
+
+ for (stringlen =3D len; stringlen !=3D 0; stringlen -=3D n)
+ {
+ /* Identify a run of glyphs with the same face. */
+ int face_id =3D string->face_id;
+
+ for (n =3D 1; n < stringlen; ++n)
+ if (string[n].face_id !=3D face_id)
+ break;
+
+ /* Turn appearance modes of the face of the run on. */
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
=20
=2D for (n =3D 1; n < stringlen; ++n)
=2D if (string[n].face_id !=3D face_id)
=2D break;
+ if (n =3D=3D stringlen && !write_on_last_cell)
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer =3D encode_terminal_code (string, n,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+ string +=3D n;
=20
=2D /* Turn appearance modes of the face of the run on. */
+ /* Turn appearance modes off. */
+ turn_off_face (f, face_id);
+ tty_turn_off_highlight (tty);
+ }
+ }
+
+ /* Write on the bottom-right corner. */
+ if (write_on_last_cell)
+ {
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ int face_id =3D string->face_id;
+
+ /* Turn appearance modes of the face. */
tty_highlight_if_desired (tty);
turn_on_face (f, face_id);
=20
=2D if (n =3D=3D stringlen)
=2D /* This is the last run. */
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer =3D encode_terminal_code (string, n, coding);
+ conversion_buffer =3D encode_terminal_code (string, 1, coding);
if (coding->produced > 0)
{
block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced, tty->output);
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
clearerr (tty->output);
if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ /* Arrange that after writing the next glyph, the glyph on the
+ current character cell is somehow pushed to the bottom-right
+ corner. */
+ if (tty->TS_ins_char)
+ {
+ OUTPUT1 (tty, tty->TS_ins_char);
+ }
+ else if (tty->TS_ins_multi_chars)
+ {
+ char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1, 0,
+ 0, 0);
+ OUTPUT1 (tty, buf);
+ xfree (buf);
+ }
+ else
+ {
+ tty_turn_on_insert (tty);
+ }
+
+ if (face_id !=3D glyph_on_char_cell_before_last.face_id)
+ {
+
+ /* Turn appearance modes of the face. */
+ turn_off_face (f, face_id);
+ tty_turn_off_highlight (tty);
+
+ face_id =3D glyph_on_char_cell_before_last.face_id;
+
+ tty_highlight_if_desired (tty);
+ turn_on_face (f, face_id);
+ }
+
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer
+ =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
unblock_input ();
}
=2D string +=3D n;
=20
/* Turn appearance modes off. */
turn_off_face (f, face_id);
tty_turn_off_highlight (tty);
+
+ tty_turn_off_insert (tty);
}
=20
cmcheckmagic (tty);
@@ -799,6 +902,7 @@ tty_write_glyphs_with_face (register struct frame *f, r=
egister struct glyph *str
{
unsigned char *conversion_buffer;
struct coding_system *coding;
+ int write_on_last_cell;
=20
struct tty_display_info *tty =3D FRAME_TTY (f);
=20
@@ -808,38 +912,118 @@ tty_write_glyphs_with_face (register struct frame *f=
, register struct glyph *str
/* Don't dare write in last column of bottom line, if Auto-Wrap,
since that would scroll the whole frame on some terminals. */
=20
=2D if (AutoWrap (tty)
=2D && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
=2D && (curX (tty) + len) =3D=3D FRAME_COLS (f))
+ write_on_last_cell =3D (AutoWrap (tty)
+ && curY (tty) + 1 =3D=3D FRAME_TOTAL_LINES (f)
+ && (curX (tty) + len) =3D=3D FRAME_COLS (f));
+ if (write_on_last_cell)
len --;
=2D if (len <=3D 0)
=2D return;
=20
=2D cmplus (tty, len);
+ if (FRAME_COLS (f) =3D=3D 1
+ || !(tty->TS_ins_char || tty->TS_ins_multi_chars
+ || (tty->TS_insert_mode && tty->TS_end_insert_mode)))
+ write_on_last_cell =3D false;
+
+ if (len <=3D 0 && !write_on_last_cell)
+ return;
=20
/* If terminal_coding does any conversion, use it, otherwise use
safe_terminal_coding. We can't use CODING_REQUIRE_ENCODING here
because it always return 1 if the member src_multibyte is 1. */
=2D coding =3D (FRAME_TERMINAL_CODING (f)->common_flags & CODING_REQUIRE_E=
NCODING_MASK
+ coding =3D ((FRAME_TERMINAL_CODING (f)->common_flags
+ & CODING_REQUIRE_ENCODING_MASK)
? FRAME_TERMINAL_CODING (f) : &safe_terminal_coding);
=2D /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only at
=2D the tail. */
+
+ /* The mode bit CODING_MODE_LAST_BLOCK should be set to 1 only
+ at the tail. */
coding->mode &=3D ~CODING_MODE_LAST_BLOCK;
=20
/* Turn appearance modes of the face. */
tty_highlight_if_desired (tty);
turn_on_face (f, face_id);
=20
=2D coding->mode |=3D CODING_MODE_LAST_BLOCK;
=2D conversion_buffer =3D encode_terminal_code (string, len, coding);
=2D if (coding->produced > 0)
+ if (len > 0)
+ {
+ cmplus (tty, len);
+ if (write_on_last_cell)
+ glyph_on_char_cell_before_last =3D string[len - 1];
+ else
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+
+ conversion_buffer =3D encode_terminal_code (string, len, coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+ }
+
+ /* Write on the bottom-right corner. */
+ if (write_on_last_cell)
{
=2D block_input ();
=2D fwrite (conversion_buffer, 1, coding->produced, tty->output);
=2D clearerr (tty->output);
=2D if (tty->termscript)
=2D fwrite (conversion_buffer, 1, coding->produced, tty->termscript);
=2D unblock_input ();
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ conversion_buffer =3D encode_terminal_code (string, 1, coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ /* Go to the previous position. */
+ cmgoto (tty, curY (tty), curX (tty) - 1);
+ cmplus (tty, 1);
+
+ /* Arrange that after writing the next glyph, the glyph on the
+ current character cell is somehow pushed to the bottom-right
+ corner. */
+ if (tty->TS_ins_char)
+ {
+ OUTPUT1 (tty, tty->TS_ins_char);
+ }
+ else if (tty->TS_ins_multi_chars)
+ {
+ char *buf =3D tparam (tty->TS_ins_multi_chars, 0, 0, 1,
+ 0, 0, 0);
+ OUTPUT1 (tty, buf);
+ xfree (buf);
+ }
+ else
+ {
+ tty_turn_on_insert (tty);
+ }
+
+ /* This is the last run. */
+ coding->mode |=3D CODING_MODE_LAST_BLOCK;
+ conversion_buffer
+ =3D encode_terminal_code (&glyph_on_char_cell_before_last, 1,
+ coding);
+ if (coding->produced > 0)
+ {
+ block_input ();
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->output);
+ clearerr (tty->output);
+ if (tty->termscript)
+ fwrite (conversion_buffer, 1, coding->produced,
+ tty->termscript);
+ unblock_input ();
+ }
+
+ tty_turn_off_insert (tty);
}
=20
/* Turn appearance modes off. */
=2D-=20
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable
>>
>> The places you mention sound right. It's probably all in term.c. But
>> I'd like to add, that in principle all places writing to the terminal
>> have to be checked at least.
>>
>> And corner cases have to be taken into consideration :-). Pulling
>> something out of thin air: What happens if we write RGRG to the
>> bottom-right corner, where R is one red char, and G is 1 green char,
>> say.
I tried "RGRG\", where "R" is red, "G" is green, and "\" is the (white)
continuation glyph. Looks like this patch also fixes bug#57728.
=2D-=20
Akib Azmain Turja
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Subject: Re: bug#57607: Feature request: Use the character cell on
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> On 22-09-11 11:00 , Akib Azmain Turja wrote:
>> Should I report this as a bug?
>
> Yes, please. Someone should take a look at this.
>
Done, see bug#57728.
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <87y1ut9b3b.fsf@HIDDEN> (Akib Azmain Turja's message of
"Thu, 08 Sep 2022 20:47:52 +0600")
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Akib Azmain Turja <akib@HIDDEN> writes:
> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>
>> Akib Azmain Turja <akib@HIDDEN> writes:
>>
>>> Yes, I'm interested, because I think it would help me understand how
>>> Emacs renders text in terminal, which would help me to implement child
>>> frame in terminal. But I don't have the time to do it right now. I
>>> hope I can start doing this by late October.
>>
>> Great! I've re-opened this issue.
>>
>>>
>>>>
>>>> The places you mention sound right. It's probably all in term.c. But
>>>> I'd like to add, that in principle all places writing to the terminal
>>>> have to be checked at least.
>>>>
>>>> And corner cases have to be taken into consideration :-). Pulling
>>>> something out of thin air: What happens if we write RGRG to the
>>>> bottom-right corner, where R is one red char, and G is 1 green char,
>>>> say.
>>>
>>> I think you meant the following in Bash:
>>>
>>> printf "%$((COLUMNS - 4))s\e[31mr\e[32mg\e7\e[32mg\e8\e[@\e[31mr\e[m" "=
" ; sleep 1 ; printf '\n'
>>>
>>> And it works on St, Kitty, Coterm, Term, etc.
>>
>> What I was thinking of is the Emacs side of things, i.e. can we always
>> do our magic locally in tty_write... etc., or is it sometimes necessary
>> to reorder writes at the caller.
>
> We would need to remember the glyph in the character cell before the
> last one, because modifying the last character cell needs to rewrite to
> that cell.
Just to add, terminal is with 'smam' (enable automatic margin) and
'rmam' (disable automatic margin) can disable automatic margin, thus can
write the last character cell.
And, Emacs currently often writes to the last character possibly by
mistake. I'm not sure whether this is a bug or not. To reproduce, run
emacs -Q, hit M-: (eval-expression), write some garbage until the
minibuffer window scrolls (I used (+ (% (random) 26) ?a) to generate
the garbage), and hit C-p until you scroll down a line. You should now
see that the last character cell contains a continuation ('\') glyph. I
think this is probably due to the use of 'il' or 'il1' or 'rin'
capability. Should I report this as a bug?
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <m2edwm3uyk.fsf@HIDDEN> ("Gerd =?utf-8?Q?M=C3=B6llman?=
=?utf-8?Q?n=22's?= message of "Thu, 08 Sep 2022 14:35:15 +0200")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
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Date: Thu, 08 Sep 2022 20:47:52 +0600
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> Akib Azmain Turja <akib@HIDDEN> writes:
>
>> Yes, I'm interested, because I think it would help me understand how
>> Emacs renders text in terminal, which would help me to implement child
>> frame in terminal. But I don't have the time to do it right now. I
>> hope I can start doing this by late October.
>
> Great! I've re-opened this issue.
>
>>
>>>
>>> The places you mention sound right. It's probably all in term.c. But
>>> I'd like to add, that in principle all places writing to the terminal
>>> have to be checked at least.
>>>
>>> And corner cases have to be taken into consideration :-). Pulling
>>> something out of thin air: What happens if we write RGRG to the
>>> bottom-right corner, where R is one red char, and G is 1 green char,
>>> say.
>>
>> I think you meant the following in Bash:
>>
>> printf "%$((COLUMNS - 4))s\e[31mr\e[32mg\e7\e[32mg\e8\e[@\e[31mr\e[m" ""=
; sleep 1 ; printf '\n'
>>
>> And it works on St, Kitty, Coterm, Term, etc.
>
> What I was thinking of is the Emacs side of things, i.e. can we always
> do our magic locally in tty_write... etc., or is it sometimes necessary
> to reorder writes at the caller.
We would need to remember the glyph in the character cell before the
last one, because modifying the last character cell needs to rewrite to
that cell.
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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[217.227.103.172]) by smtp.gmail.com with ESMTPSA id 19-20020a05600c26d300b003a50924f1c0sm2339105wmv.18.2022.09.08.05.35.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 05:35:16 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal In-Reply-To: <87tu5i9kbg.fsf@HIDDEN> (Akib Azmain Turja's message of "Thu, 08 Sep 2022 17:28:35 +0600") References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN> <m2v8py4dqf.fsf@HIDDEN> <87tu5i9kbg.fsf@HIDDEN> Date: Thu, 08 Sep 2022 14:35:15 +0200 Message-ID: <m2edwm3uyk.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 57607 Cc: 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Akib Azmain Turja <akib@HIDDEN> writes: > Yes, I'm interested, because I think it would help me understand how > Emacs renders text in terminal, which would help me to implement child > frame in terminal. But I don't have the time to do it right now. I > hope I can start doing this by late October. Great! I've re-opened this issue. > >> >> The places you mention sound right. It's probably all in term.c. But >> I'd like to add, that in principle all places writing to the terminal >> have to be checked at least. >> >> And corner cases have to be taken into consideration :-). Pulling >> something out of thin air: What happens if we write RGRG to the >> bottom-right corner, where R is one red char, and G is 1 green char, >> say. > > I think you meant the following in Bash: > > printf "%$((COLUMNS - 4))s\e[31mr\e[32mg\e7\e[32mg\e8\e[@\e[31mr\e[m" "" ; sleep 1 ; printf '\n' > > And it works on St, Kitty, Coterm, Term, etc. What I was thinking of is the Emacs side of things, i.e. can we always do our magic locally in tty_write... etc., or is it sometimes necessary to reorder writes at the caller.
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <m2v8py4dqf.fsf@HIDDEN> ("Gerd =?utf-8?Q?M=C3=B6llman?=
=?utf-8?Q?n=22's?= message of "Thu, 08 Sep 2022 07:49:44 +0200")
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> Akib Azmain Turja <akib@HIDDEN> writes:
>
>> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>>
>> I mean, what files to change in order to do this? I think it's
>> tty_write_glyphs and tty_write_glyphs_with_face in term.c.
>
> Are you interested in implementing something? You could re-open this
> bug then, no problem. Or are you maybe just evaluating if you'd like to
> do it? Please give a hint.
Yes, I'm interested, because I think it would help me understand how
Emacs renders text in terminal, which would help me to implement child
frame in terminal. But I don't have the time to do it right now. I
hope I can start doing this by late October.
>
> The places you mention sound right. It's probably all in term.c. But
> I'd like to add, that in principle all places writing to the terminal
> have to be checked at least.
>
> And corner cases have to be taken into consideration :-). Pulling
> something out of thin air: What happens if we write RGRG to the
> bottom-right corner, where R is one red char, and G is 1 green char,
> say.
I think you meant the following in Bash:
=2D-8<---------------cut here---------------start------------->8---
printf "%$((COLUMNS - 4))s\e[31mr\e[32mg\e7\e[32mg\e8\e[@\e[31mr\e[m" "" ; =
sleep 1 ; printf '\n'
=2D-8<---------------cut here---------------end--------------->8---
And it works on St, Kitty, Coterm, Term, etc.
>
> And maybe we have to check for characters that are more than 1 column
> wide? I don't remember something like that from when I last worked in
> this area, but I'd check what the situation is nowadays.
>
> That's all I can say without studying the code more in detail, which I'm
> trying to avoid :-).
>
=2D-=20
Akib Azmain Turja
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[217.227.103.172]) by smtp.gmail.com with ESMTPSA id um28-20020a170906cf9c00b0076f927ed0f1sm749049ejb.127.2022.09.07.22.49.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Sep 2022 22:49:45 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal In-Reply-To: <874jxjhz9l.fsf@HIDDEN> (Akib Azmain Turja's message of "Wed, 07 Sep 2022 23:26:14 +0600") References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <874jxjhz9l.fsf@HIDDEN> Date: Thu, 08 Sep 2022 07:49:44 +0200 Message-ID: <m2v8py4dqf.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 57607 Cc: 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Akib Azmain Turja <akib@HIDDEN> writes: > Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes: > > I mean, what files to change in order to do this? I think it's > tty_write_glyphs and tty_write_glyphs_with_face in term.c. Are you interested in implementing something? You could re-open this bug then, no problem. Or are you maybe just evaluating if you'd like to do it? Please give a hint. The places you mention sound right. It's probably all in term.c. But I'd like to add, that in principle all places writing to the terminal have to be checked at least. And corner cases have to be taken into consideration :-). Pulling something out of thin air: What happens if we write RGRG to the bottom-right corner, where R is one red char, and G is 1 green char, say. And maybe we have to check for characters that are more than 1 column wide? I don't remember something like that from when I last worked in this area, but I'd check what the situation is nowadays. That's all I can say without studying the code more in detail, which I'm trying to avoid :-).
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <m2sfl3g4ql.fsf@HIDDEN> ("Gerd =?utf-8?Q?M=C3=B6llman?=
=?utf-8?Q?n=22's?= message of "Wed, 07 Sep 2022 06:58:42 +0200")
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
I mean, what files to change in order to do this? I think it's
tty_write_glyphs and tty_write_glyphs_with_face in term.c.
=2D-=20
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Subject: Re: bug#57607: Feature request: Use the character cell on
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> Akib Azmain Turja <akib@HIDDEN> writes:
>
>>> I guess no-one else before felt motifvated enough to implement this. Do
>>> you feel motivated?
>>
>> A little.
>
> I've added something to etc/TODO.
>
> I guess there's not much else to do, so I'm closing this for now.
OK, but what to change?
=2D-=20
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bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Received: (at 57607) by debbugs.gnu.org; 7 Sep 2022 12:58:16 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Sep 07 08:58:16 2022 Received: from localhost ([127.0.0.1]:53974 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1oVudD-0002rk-TW for submit <at> debbugs.gnu.org; Wed, 07 Sep 2022 08:58:16 -0400 Received: from mail-ej1-f53.google.com ([209.85.218.53]:45892) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <gerd.moellmann@HIDDEN>) id 1oVudB-0002rW-Le for 57607 <at> debbugs.gnu.org; Wed, 07 Sep 2022 08:58:14 -0400 Received: by mail-ej1-f53.google.com with SMTP id dv25so889799ejb.12 for <57607 <at> debbugs.gnu.org>; Wed, 07 Sep 2022 05:58:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:user-agent:message-id:date:references:in-reply-to :subject:cc:to:from:from:to:cc:subject:date; bh=O1xC7L8lWS4DTWtbzkM23tF5F7REFDfAHYyUWnhQlBg=; b=p9+Dq1kVVUH3n0tb9ajdg5GNQJpmbywT8cvjIibvMcAJSP2MFvVuXw/WiZWA/YxnBk O3104np98elmKID4YtpAevRfpmOL6q7eEGqtbMadRCeAKMHUa+M+AULoX61xkg93feoN TblWnQOF8pcRK0q5QwjYJnSIEOQhDPCL8RctYL3G9NdrEjjJ56HhuPs8exG3f1rEY6vu J8mEADjPNUS81gL/GY4dZB5bwBeCS+EN1MU+rT151hFTmN7y4XtRSGHe7F5G+7kiVdM4 NQspTvBGItpxbA6+pYskcTCL32Tz2MJvGmwq5RDQxe4m2nElqk8BygyquwMewY/XUl0v eO9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=mime-version:user-agent:message-id:date:references:in-reply-to :subject:cc:to:from:x-gm-message-state:from:to:cc:subject:date; bh=O1xC7L8lWS4DTWtbzkM23tF5F7REFDfAHYyUWnhQlBg=; b=DRC/uhhNg9Fx5rd3NpyPulVXqtlMTJQo7391nWG9r6yqIHnQV7DggHWrYAeLUmmQRS lS6MAJV3D7Jzqy868sfnb1V4wIzKt2c0LbXzFr88Kk/q/Gf2l7M0liFzqigP8KvAYI0P tWn6UPhHCcfeokEZrUFyfldeTiIj4mx2aWN9d8EML3GIts0ZC04haEaeb+ZqgJ9KR/QI L6L0rOr0HWf/RKcP6H8Jdc23TokAJpZyoeFYeYUaJhBGJAsAOINaMGmrRSylMTSZdhPF cCvK+PU61jAj9kOYrq3SZEXbUwsq2MbOJpmfe/EczZkDZLmytARkNjviU7/8qEbsDio1 h0zw== X-Gm-Message-State: ACgBeo0daweMveOCR7k118CkHrogucHmwC87Tldbwyc50adYOdZnOztG xDCKxMwzz61QIvpcz41ciGBuzpZExnW+jw== X-Google-Smtp-Source: AA6agR7GaUdIgK1Ta8pYAz9bsRmi/TFYwONqZbKOJYtzEUG5NIren4lNm6vV34M8D6FJyNIfZ3varw== X-Received: by 2002:a17:906:c150:b0:751:2181:87a6 with SMTP id dp16-20020a170906c15000b00751218187a6mr2143202ejc.692.1662555487447; Wed, 07 Sep 2022 05:58:07 -0700 (PDT) Received: from Mini.fritz.box (pd9e3684f.dip0.t-ipconnect.de. [217.227.104.79]) by smtp.gmail.com with ESMTPSA id u17-20020a1709061db100b0073d53f4e053sm8339760ejh.104.2022.09.07.05.58.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Sep 2022 05:58:06 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal In-Reply-To: <87edwnl5co.fsf@HIDDEN> (Akib Azmain Turja's message of "Wed, 07 Sep 2022 18:46:31 +0600") References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> <m2v8q0g1ak.fsf@HIDDEN> <875yi0v8r6.fsf@HIDDEN> <m2sfl3g4ql.fsf@HIDDEN> <87edwnl5co.fsf@HIDDEN> Date: Wed, 07 Sep 2022 14:58:06 +0200 Message-ID: <m28rmvfijl.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 57607 Cc: 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Akib Azmain Turja <akib@HIDDEN> writes: > OK, but what to change in Emacs??? I guess I'm missing something. What do you mean?
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Subject: Re: bug#57607: Feature request: Use the character cell on
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References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> Akib Azmain Turja <akib@HIDDEN> writes:
>
>>> I guess no-one else before felt motifvated enough to implement this. Do
>>> you feel motivated?
>>
>> A little.
>
> I've added something to etc/TODO.
>
> I guess there's not much else to do, so I'm closing this for now.
>
>
>
OK, but what to change in Emacs???
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Gerd Möllmann <gerd.moellmann@HIDDEN>
to control <at> debbugs.gnu.org.
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <m2v8q0g1ak.fsf@HIDDEN> ("Gerd =?utf-8?Q?M=C3=B6llman?=
=?utf-8?Q?n=22's?= message of "Tue, 06 Sep 2022 14:00:51 +0200")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
<m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN>
<m2v8q0g1ak.fsf@HIDDEN>
Date: Tue, 06 Sep 2022 21:10:37 +0600
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> Akib Azmain Turja <akib@HIDDEN> writes:
>
>> Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
>>
>>> Emacs already writes to the bottom-right corner in case neither "am" nor
>>> "xn" are defined for the terminal in question. vt100 and xterm, for
>>> instance, have "am" defined here, so Emacs doesn't write to the
>>> bottom-right corner.
>>
>> I repeat: vt100 and xterm-like terminal having any of 'ich', 'ich1',
>> 'il' and 'il1' or both 'smir' and 'rmir' can write to the last character
>> cell reliably without scrolling.
>>
>> Here is what Emacs can do IMHO:
>>
>
> I know that, I can edit text :-).
>
> I guess no-one else before felt motifvated enough to implement this. Do
> you feel motivated?
A little.
> I could show you where to look, if you like.
It's good to know, in case I (or someone else) try to do this.
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Received: (at 57607) by debbugs.gnu.org; 6 Sep 2022 12:01:02 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Sep 06 08:01:02 2022 Received: from localhost ([127.0.0.1]:49963 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1oVXGI-00064c-4S for submit <at> debbugs.gnu.org; Tue, 06 Sep 2022 08:01:02 -0400 Received: from mail-ej1-f49.google.com ([209.85.218.49]:46018) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <gerd.moellmann@HIDDEN>) id 1oVXGF-000640-CR for 57607 <at> debbugs.gnu.org; Tue, 06 Sep 2022 08:01:00 -0400 Received: by mail-ej1-f49.google.com with SMTP id lx1so22622293ejb.12 for <57607 <at> debbugs.gnu.org>; Tue, 06 Sep 2022 05:00:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:user-agent:message-id:date :references:in-reply-to:subject:cc:to:from:from:to:cc:subject:date; bh=wq4crxzNghSOYmlUAOyo2sR5u2pdEk0myabKsxOrCog=; b=BtaYs/Pe/PHPdZjeRP1mH2CL92w3sZFJAtUtCsIJNtQ9zmovPjrxxAv2sTNsavmmL+ MC9IrA0UKlDa+mpYSLF05uMk4K8EhPKVhGn4LO/NwZUAavbfxlm9ZsHcM+Kwao1zH6UX +4wOXNiXV9iHEtznY9FacUjzacURn0ZzfLSqPAqVz5fpczYOXQQX1z6EktLBTG/q659C RXnQgK9KjHv1Fwi2QjW3jb/giRqtTRZdwdOf2vjx68WyExf7liZm6zmi7cboKe4qGdH4 0Yb7JR2WxAGP0Xs5KTQabjCevIR5Lyhb1bm3xZMjVr21qagcL+OMx7ZLUOl/UPGkvuS1 o+Fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:user-agent:message-id:date :references:in-reply-to:subject:cc:to:from:x-gm-message-state:from :to:cc:subject:date; bh=wq4crxzNghSOYmlUAOyo2sR5u2pdEk0myabKsxOrCog=; b=EUZhhWSXzPDajybMQhygBo/8tdgqkSLLEOtYc2lWDJxqVoSJLZa1y8QA10ty+Z34FO igseqWIzipAkusTueAGR/ZkKIIxZRGI2qhJMRIoULH/xXtHglN+9sYAWdXIJCMn3dnm6 ISDlBB7Mj5Vk1iODlrdU9O6FXNsINsp51aQJdpQQmZtDMDsqIADd0SkuyWaLJeM7Mjty MEQ/vr5d5VB+b/AOeJGvO7cfWp29lFIsmWwEoanWGJhcyneqiJiiq/mjoUGRPkSO+7mA mU32O81l5dnBwHEQw7pOiERq0vJiInkrMOlef2KllFMe+/gJ/vhtZGZggYnvThvNqOWz LzXA== X-Gm-Message-State: ACgBeo1NPh1rZdK9J0556zJfvz33+ByOfM2+VM1yYW6QscnNLV+vXyQ6 pgbQUL0IX6pY4q3O2JiEPJQn0ztJMWU= X-Google-Smtp-Source: AA6agR7Ru+EaVeqB6BviYcbVxHEtFKqypsrhmL3ROQCS7iTA3DJvBdAg2BfvfuqpZVT9dtr5zNZRLg== X-Received: by 2002:a17:907:7d91:b0:731:7ecb:1e5b with SMTP id oz17-20020a1709077d9100b007317ecb1e5bmr39107727ejc.78.1662465652936; Tue, 06 Sep 2022 05:00:52 -0700 (PDT) Received: from Mini.fritz.box (pd9e364b5.dip0.t-ipconnect.de. [217.227.100.181]) by smtp.gmail.com with ESMTPSA id u2-20020a056402064200b00447f434e4d7sm8236421edx.20.2022.09.06.05.00.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Sep 2022 05:00:52 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal In-Reply-To: <87ilm04xzl.fsf@HIDDEN> (Akib Azmain Turja's message of "Tue, 06 Sep 2022 16:07:42 +0600") References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> <m2zgfdexpq.fsf@HIDDEN> <87ilm04xzl.fsf@HIDDEN> Date: Tue, 06 Sep 2022 14:00:51 +0200 Message-ID: <m2v8q0g1ak.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 57607 Cc: 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Akib Azmain Turja <akib@HIDDEN> writes: > Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes: > >> Emacs already writes to the bottom-right corner in case neither "am" nor >> "xn" are defined for the terminal in question. vt100 and xterm, for >> instance, have "am" defined here, so Emacs doesn't write to the >> bottom-right corner. > > I repeat: vt100 and xterm-like terminal having any of 'ich', 'ich1', > 'il' and 'il1' or both 'smir' and 'rmir' can write to the last character > cell reliably without scrolling. > > Here is what Emacs can do IMHO: > I know that, I can edit text :-). I guess no-one else before felt motifvated enough to implement this. Do you feel motivated? I could show you where to look, if you like.
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@HIDDEN>
Subject: Re: bug#57607: Feature request: Use the character cell on
bottom-right corner of a terminal
In-Reply-To: <m2zgfdexpq.fsf@HIDDEN> ("Gerd =?utf-8?Q?M=C3=B6llman?=
=?utf-8?Q?n=22's?= message of "Tue, 06 Sep 2022 10:03:29 +0200")
References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN>
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Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN> writes:
> Akib Azmain Turja <akib@HIDDEN> writes:
>
>> Forwarding to bug-gnu-emacs list.
>>
>> Akib Azmain Turja <akib@HIDDEN> writes:
>>
>>> Emacs never writes to the bottom-right corner of a terminal, because the
>>> terminal might open a new line at bottom of screen. But terminals
>>> having any of 'ich', 'ich1' and 'smir' capabilities can write to the
>>> bottom-right corner of the terminal. Almost all terminals have at least
>>> one of the aforementioned capabilities. Why doesn't Emacs make use of
>>> that?
>
> I don't know. And I don't know if that would work, it would require
> investigation.
There must be a way reliably way to do so, because ncurses can write to
the last character cell on terminal on linux console and xterm-like
terminal emulators.
>
> Emacs already writes to the bottom-right corner in case neither "am" nor
> "xn" are defined for the terminal in question. vt100 and xterm, for
> instance, have "am" defined here, so Emacs doesn't write to the
> bottom-right corner.
I repeat: vt100 and xterm-like terminal having any of 'ich', 'ich1',
'il' and 'il1' or both 'smir' and 'rmir' can write to the last character
cell reliably without scrolling.
Here is what Emacs can do IMHO:
Glyph matrix (or whatever):
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong message.|
+------------------------+
* Case: Any of 'ich', 'ich1', or both 'smir' and 'rmir' defined.
*Note*: Won't work on displays with only a single column.
Write to all character cells except the last two:
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong messag | <-- cursor
+------------------------+
^
|
cursor
* Case: 'ich1' defined.
Write the glyph to be placed on the last character cell.
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong messag. | <-- cursor
+------------------------+
^
|
cursor
Move to the character cell on the left side (cub1):
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong messag. | <-- cursor
+------------------------+
^
|
cursor
Invoke (or write or whatever) 'ich1':
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong messag .| <-- cursor
+------------------------+
^
|
cursor
Write the glyph to be placed on the character cell before the last
character cell:
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong message.| <-- cursor
+------------------------+
^
|
cursor
* Case: 'ich' defined.
Same as the 'ich1' case, but invoke 'ich' with parameter '1' instead
of 'ich1'.
* Case: 'smir' and 'rmir' defined.
Write the glyph to be placed on the last character cell.
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong messag. | <-- cursor
+------------------------+
^
|
cursor
Move to the character cell on the left side (cub1):
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong messag. | <-- cursor
+------------------------+
^
|
cursor
Invoke 'smir'.
Write the glyph to be placed on the character cell before the last
character cell:
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong message.| <-- cursor
+------------------------+
^
|
cursor
Invoke 'rmir'.
* Case: 'il' or 'il1' defined.
*Note*: Won't work on displays with only a single line.
Write to all lines except the last two:
+------------------------+
|foo |
|bar |
|baz |
| | <-- cursor
| |
+------------------------+
^
|
cursor
Write the glyphs to be placed on the last line.
+------------------------+
|foo |
|bar |
|baz |
|A very looooong message.|
| | <-- cursor
+------------------------+
^
|
cursor
Move to the character cell above (cuu1):
+------------------------+
|foo |
|bar |
|baz |
|A very looooong message.| <-- cursor
| |
+------------------------+
^
|
cursor
* Case: 'il1' defined.
Invoke 'il1'.
* Case: 'il' defined.
Invoke 'il1' with parameter '1'.
+------------------------+
|foo |
|bar |
|baz |
| | <-- cursor
|A very looooong message.|
+------------------------+
^
|
cursor
Insert the glyphs to be placed on the line before the last line:
+------------------------+
|foo |
|bar |
|baz |
| --- *scratch* ---------|
|A very looooong message.| <-- cursor
+------------------------+
^
|
cursor
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
Full text available.Received: (at 57607) by debbugs.gnu.org; 6 Sep 2022 08:03:39 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Sep 06 04:03:39 2022 Received: from localhost ([127.0.0.1]:49483 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1oVTYZ-0004st-8G for submit <at> debbugs.gnu.org; Tue, 06 Sep 2022 04:03:39 -0400 Received: from mail-ej1-f45.google.com ([209.85.218.45]:42927) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <gerd.moellmann@HIDDEN>) id 1oVTYX-0004sh-Iw for 57607 <at> debbugs.gnu.org; Tue, 06 Sep 2022 04:03:38 -0400 Received: by mail-ej1-f45.google.com with SMTP id dc5so1503718ejb.9 for <57607 <at> debbugs.gnu.org>; Tue, 06 Sep 2022 01:03:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:user-agent:message-id:date:references:in-reply-to :subject:cc:to:from:from:to:cc:subject:date; bh=dMY9VCl32DsZs1nX9hNt1lAVQ2AmsmA/sNsLE79CGV8=; b=omSdy6rZsY8keftvLUpn0Sl24AQuwLgo4tZTw+CTX2yxYHUzGyz8purBhJKbVm3CWP Xs/HdMAeqvSutl9ui7QZFaWInMymuR+hjT4VEZE9qttnwDG/wFdBo67A5NLqjk9vBaMM E8/se0zDmdKjGcZb0amo/hTxB1S/zVw6ab0TEykEX86XVffyRjFpqtK9qkzf0mG1qWlW J4hx1pb+DjDMkCIWHiwWZ+vNMe44qAdnwwObD3PeSwZ50flR/uzRG8iVc6r5NRjEpdS7 svuf/WkAbmqk/2/IC32v7VVyEy79L/ljSQ+dQyYghgbWpQnrogkgVZC+Tl5rlUX5WnsR pzfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=mime-version:user-agent:message-id:date:references:in-reply-to :subject:cc:to:from:x-gm-message-state:from:to:cc:subject:date; bh=dMY9VCl32DsZs1nX9hNt1lAVQ2AmsmA/sNsLE79CGV8=; b=I1Fd7Z+KQmc6V2aCmhnZc9pOduzOV/xuP1RMlgGIyPgyL6qEyMQeOR4LcR7nj9TdbZ GXZ5xe48W/peuvP7KPoEukftHgdS/ZnLRJhbfNe4PSQTLnp+kdliL1Ytm84mDpNtoo7G FRDqCZ5iYJl5Rx+KFeXmuqPqTeqX73F5sJM+DNrBYR7eDKeAZrYfTYAiCTr89hFf2qSD sTIFcHi/kWSYW3MTTgvbPb/aATaz0c1TU2ZBCEP9BbQb30NRaSXn6gzxu/4ZFTdqAybK tIreVwyfIJkSmg+CGeJ4BBsLQ9Iua/V1MjfBaR8+cwiPvx9h8s/J70pJZpsDBUAHlbmO u5eQ== X-Gm-Message-State: ACgBeo0eVBHdTZnna/Jf7dUiKM7Gdq/EN5lphfhLyrzOV43hefelzNxi NON33ne78F73kdqi+jBpXe6I+59F/nM= X-Google-Smtp-Source: AA6agR5zlec8DJYNVoWpI6BpZ3dOJQVSCVlDyXnr8jEPe0CRuD4avohbR09tlN7xtMisiG7A4oNYQQ== X-Received: by 2002:a17:907:7f8b:b0:73d:6f4f:30f7 with SMTP id qk11-20020a1709077f8b00b0073d6f4f30f7mr37944573ejc.323.1662451411258; Tue, 06 Sep 2022 01:03:31 -0700 (PDT) Received: from Mini.fritz.box (pd9e364b5.dip0.t-ipconnect.de. [217.227.100.181]) by smtp.gmail.com with ESMTPSA id ay2-20020a056402202200b0044841a78c70sm7868908edb.93.2022.09.06.01.03.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Sep 2022 01:03:30 -0700 (PDT) From: =?utf-8?Q?Gerd_M=C3=B6llmann?= <gerd.moellmann@HIDDEN> To: Akib Azmain Turja <akib@HIDDEN> Subject: Re: bug#57607: Feature request: Use the character cell on bottom-right corner of a terminal In-Reply-To: <87o7vt3s58.fsf@HIDDEN> (Akib Azmain Turja's message of "Tue, 06 Sep 2022 12:59:15 +0600") References: <87wnakl5md.fsf@HIDDEN> <87o7vt3s58.fsf@HIDDEN> Date: Tue, 06 Sep 2022 10:03:29 +0200 Message-ID: <m2zgfdexpq.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: 57607 Cc: 57607 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Akib Azmain Turja <akib@HIDDEN> writes: > Forwarding to bug-gnu-emacs list. > > Akib Azmain Turja <akib@HIDDEN> writes: > >> Emacs never writes to the bottom-right corner of a terminal, because the >> terminal might open a new line at bottom of screen. But terminals >> having any of 'ich', 'ich1' and 'smir' capabilities can write to the >> bottom-right corner of the terminal. Almost all terminals have at least >> one of the aforementioned capabilities. Why doesn't Emacs make use of >> that? I don't know. And I don't know if that would work, it would require investigation. Emacs already writes to the bottom-right corner in case neither "am" nor "xn" are defined for the terminal in question. vt100 and xterm, for instance, have "am" defined here, so Emacs doesn't write to the bottom-right corner.
bug-gnu-emacs@HIDDEN:bug#57607; Package emacs.
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To: bug-gnu-emacs@HIDDEN
Subject: Feature request: Use the character cell on bottom-right corner of a
terminal
In-Reply-To: <87wnakl5md.fsf@HIDDEN> (Akib Azmain Turja's message of
"Sat, 03 Sep 2022 23:39:22 +0600")
References: <87wnakl5md.fsf@HIDDEN>
Date: Tue, 06 Sep 2022 12:59:15 +0600
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Forwarding to bug-gnu-emacs list.
Akib Azmain Turja <akib@HIDDEN> writes:
> Emacs never writes to the bottom-right corner of a terminal, because the
> terminal might open a new line at bottom of screen. But terminals
> having any of 'ich', 'ich1' and 'smir' capabilities can write to the
> bottom-right corner of the terminal. Almost all terminals have at least
> one of the aforementioned capabilities. Why doesn't Emacs make use of
> that?
=2D-=20
Akib Azmain Turja
Find me on Mastodon at @akib@HIDDEN
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Akib Azmain Turja <akib@HIDDEN>:bug-gnu-emacs@HIDDEN.
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