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Subject: [bug#75787] [PATCH] gnu: Add microcabal.
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Depends on <https://issues.guix.gnu.org/75778>.

* gnu/packages/haskell-apps.scm (microcabal): New variable.

Change-Id: Ib676c2afc360c379183422b1038f045af5485b59
---
 gnu/packages/haskell-apps.scm | 50 +++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/gnu/packages/haskell-apps.scm b/gnu/packages/haskell-apps.scm
index 1ef3ed4035..d0c3ebdc42 100644
--- a/gnu/packages/haskell-apps.scm
+++ b/gnu/packages/haskell-apps.scm
@@ -20,6 +20,7 @@
 ;;; Copyright © 2021 Morgan Smith <Morgan.J.Smith@HIDDEN>
 ;;; Copyright © 2022 David Thompson <dthompson2@HIDDEN>
 ;;; Copyright © 2024 jgart <jgart@HIDDEN>
+;;; Copyright © 2025 Homo <gay@HIDDEN>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -42,6 +43,7 @@ (define-module (gnu packages haskell-apps)
   #:use-module (guix git-download)
   #:use-module (guix packages)
   #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system gnu)
   #:use-module (guix build-system haskell)
   #:use-module (gnu packages)
   #:use-module (gnu packages bash)
@@ -783,6 +785,54 @@ (define-public matterhorn
      "This is a terminal client for the Mattermost chat system.")
     (license license:bsd-3)))

+(define-public microcabal
+  ;; There are no tags, using latest commit.
+  (let ((commit "52e23c1472f63c546e8c366b722aaaef365713f9")
+        (revision "0"))
+    (package
+      (name "microcabal")
+      (version (git-version "0.4.1.0" revision commit))
+      (source (origin
+        (method git-fetch)
+        (uri (git-reference
+          (url "https://github.com/augustss/MicroCabal")
+          (commit commit)))
+        (file-name (git-file-name name version))
+        (sha256
+          (base32 "0f1ikjgj2wrg1wrc4g4rhws791iajvajk7pr8yjr4di2v9h930ak"))))
+      (build-system gnu-build-system)
+      (arguments
+        (list
+          #:make-flags #~(list "MHS=mhs")
+          ;; Tests require *.cabal files from MicroHs's code.
+          #:tests? #f
+          #:phases
+          #~(modify-phases %standard-phases
+            (replace 'configure
+              (lambda _
+                (substitute* "Makefile"
+                  (("MHSDIR=[^ ]* ?")
+                    "")
+                  ;; Don't build with GHC.
+                  (("bin/gmcabal bin/mcabal")
+                    "bin/mcabal"))))
+            (replace 'install
+              (lambda _
+                (let ((bin (string-append #$output "/bin/")))
+                  (install-file "bin/mcabal" bin)))))))
+      (propagated-inputs (list microhs))
+      (home-page "https://github.com/augustss/MicroCabal")
+      (synopsis "Reimplementation of a subset of Cabal")
+      (description "Why a reimplementation?  Because Cabal is not a Haskell tool, it is a ghc tool.
+A Haskell tool should be compilable by an implementation of Haskell2010,
+which Cabal is definitely not.
+
+The implementation assumes a Unix-like system with commands like `wget` and `tar`.
+
+To get a consistent set of packages MicroCabal uses Stackage to find compatible packages.
+So in a sense, MicroCabal is more like a MicroStackage.")
+      (license license:asl2.0))))
+
 (define-public nixfmt
   (package
     (name "nixfmt")
-- 
2.47.1

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To: Homo <gay@HIDDEN>
Subject: bug#75787: Acknowledgement ([PATCH] gnu: Add microcabal.)
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Subject: [bug#75787] [PATCH] gnu: Add microcabal.
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Hi,

> * gnu/packages/haskell-apps.scm (microcabal): New variable.

I’m using a slightly modified patch (see attachment), but `mcabal`
cannot build any packages. It seems that it ignores the MHSDIR environment
variable:

    mcabal build fail
    mcabal: Build package fail
    mcabal: Building in /home/lars/.mcabal/packages/fail-4.9.0.0
    mcabal: Building library fail
    mhs: error: no location: Module not found: Mhs.Builtin
    search path=[".","dist-mcabal/autogen"]
    package path=["."]
    mhs: error: callCommand: failed 256, "mhs -Pfail-4.9.0.0 -ofail-4.9.0.0.pkg -i -i. -idist-mcabal/autogen '-DVERSION_base=\"4.19.1.0\"' '-DMIN_VERSION_base(x,y,z)=((x)<4||(x)==4&&(y)<19||(x)==4&&(y)==19&&(z)<=1)' -a. Control.Monad.Fail"

Looking at the MicroCabal sources mcabal might be expecting mhs to be
installed as an “mcabal package”?

Lars


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From 9d701dac7c56db1e662e2930a324bd4581e7ce79 Mon Sep 17 00:00:00 2001
Message-ID: <9d701dac7c56db1e662e2930a324bd4581e7ce79.1738415691.git.lars@HIDDEN>
From: Homo <gay@HIDDEN>
Date: Thu, 23 Jan 2025 18:20:33 +0200
Subject: [PATCH] gnu: Add microcabal.

Depends on <https://issues.guix.gnu.org/75778>.

* gnu/packages/haskell-apps.scm (microcabal): New variable.

Change-Id: Ib676c2afc360c379183422b1038f045af5485b59
Signed-off-by: Lars-Dominik Braun <lars@HIDDEN>
---
 gnu/packages/haskell-apps.scm | 59 +++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/gnu/packages/haskell-apps.scm b/gnu/packages/haskell-apps.scm
index 1ef3ed4035..6b61ae026b 100644
--- a/gnu/packages/haskell-apps.scm
+++ b/gnu/packages/haskell-apps.scm
@@ -20,6 +20,7 @@
 ;;; Copyright � 2021 Morgan Smith <Morgan.J.Smith@HIDDEN>
 ;;; Copyright � 2022 David Thompson <dthompson2@HIDDEN>
 ;;; Copyright � 2024 jgart <jgart@HIDDEN>
+;;; Copyright � 2025 Homo <gay@HIDDEN>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -42,8 +43,10 @@ (define-module (gnu packages haskell-apps)
   #:use-module (guix git-download)
   #:use-module (guix packages)
   #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix build-system gnu)
   #:use-module (guix build-system haskell)
   #:use-module (gnu packages)
+  #:use-module (gnu packages base)
   #:use-module (gnu packages bash)
   #:use-module (gnu packages curl)
   #:use-module (gnu packages freedesktop)
@@ -59,6 +62,7 @@ (define-module (gnu packages haskell-apps)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages rsync)
   #:use-module (gnu packages version-control)
+  #:use-module (gnu packages wget)
   #:use-module (gnu packages xorg))
 
 (define-public apply-refact
@@ -783,6 +787,61 @@ (define-public matterhorn
      "This is a terminal client for the Mattermost chat system.")
     (license license:bsd-3)))
 
+(define-public microcabal
+  ;; There are no tags, using latest commit.
+  (let ((commit "75aab2f5dfa3bacc1876dc1da9828a7e54e01d68")
+        (revision "0"))
+    (package
+      (name "microcabal")
+      (version (git-version "0.5.0.0" revision commit))
+      (source (origin
+        (method git-fetch)
+        (uri (git-reference
+          (url "https://github.com/augustss/MicroCabal")
+          (commit commit)))
+        (file-name (git-file-name name version))
+        (sha256
+          (base32 "0hzp2zfvldl5gmnvr33vxbpd75fhm4kkdsvakd49wdpmcamp01yg"))))
+      (build-system gnu-build-system)
+      (arguments
+        (list
+          #:make-flags #~(list "MHS=mhs")
+          ;; Tests require *.cabal files from MicroHs's code.
+          #:tests? #f
+          #:phases
+          #~(modify-phases %standard-phases
+            (add-after 'unpack 'fix-paths
+              (lambda* (#:key inputs #:allow-other-keys)
+                (substitute* "src/MicroCabal/Unix.hs"
+                  (("(\"[^\"]*)(wget|mkdir|tar|rm|cp)( [^\"]*\")" all prefix binary postfix)
+                   (string-append
+                     prefix
+                    (search-input-file inputs (string-append "/bin/" binary))
+                    postfix)))))
+            (replace 'configure
+              (lambda _
+                (substitute* "Makefile"
+                  (("MHSDIR=[^ ]* ?")
+                    "")
+                  ;; Don't build with GHC.
+                  (("bin/gmcabal bin/mcabal")
+                    "bin/mcabal"))))
+            (replace 'install
+              (lambda _
+                (let ((bin (string-append #$output "/bin/")))
+                  (install-file "bin/mcabal" bin)))))))
+      (inputs (list wget tar coreutils))
+      (propagated-inputs (list microhs)) ;; Propagate microhs, because it needs a search path.
+      (home-page "https://github.com/augustss/MicroCabal")
+      (synopsis "Reimplementation of a subset of Cabal")
+      (description "Why a reimplementation?  Because Cabal is not a Haskell tool, it is a ghc tool.
+A Haskell tool should be compilable by an implementation of Haskell2010,
+which Cabal is definitely not.
+
+To get a consistent set of packages MicroCabal uses Stackage to find compatible packages.
+So in a sense, MicroCabal is more like a MicroStackage.")
+      (license license:asl2.0))))
+
 (define-public nixfmt
   (package
     (name "nixfmt")

base-commit: b226a1007a9111adacb05984b8d74def24257dce
prerequisite-patch-id: cf5c00ff7ab68e16a9c83d294d57d08c1745dfeb
-- 
2.47.1


--oRdi2zfz9SGZ96iv--

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Hi,

Sorry about that, I expected it to be used only to build packages for 
Guix, not as package manager.

It's surprising MicroHs itself ignores MHSDIR, considering it didn't 
ignore this variable while building MicroCabal.

Considering inputs are runtime dependencies, shouldn't they go to 
propagated-inputs?

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From: Lars-Dominik Braun <lars@HIDDEN>
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Hi,

> Sorry about that, I expected it to be used only to build packages for 
> Guix, not as package manager.

do you have an example for that? I would like to be able to do both,
if possible.

> It's surprising MicroHs itself ignores MHSDIR, considering it didn't 
> ignore this variable while building MicroCabal.

I believe MicroCabal explicitly unsets the search path (via `-i`
without any argument).

> Considering inputs are runtime dependencies, shouldn't they go to 
> propagated-inputs?

Yes and no. Whenever possible, runtime dependencies should be plain
inputs. The key here is that their paths are baked into the resulting
mcabal binary via the 'fix-paths phase. propagated-inputs is (imo)
a last-resort is case that is not feasible or desired.

Lars

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> do you have an example for that? I would like to be able to do both,
> if possible.

Nope, no idea yet, it might need slight modification to make such 
example possible, because there are different places where to lookup 
packages and where to install packages, to figure this out the only 
documentation available is source code.

> I believe MicroCabal explicitly unsets the search path (via `-i`
> without any argument).

Looks like intention to rebuild MicroHs to be installed as package 
managed by MicroCabal, except it doesn't know how to do that, because 
base (and few more packages) are expected to be backed into Haskell 
implementation, but then in standalone package manager scenario you can 
use old compiler (unknown to MicroCabal) and old MicroCabal (also 
unknown to MicroCabal) to build and install new compiler, new base and 
new MicroCabal. I have no idea what to do about other packages expected 
to be baked into implementation, maybe same workflow - clone git repo 
manually.

Last modified: Tue, 4 Feb 2025 17:15:02 UTC

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