From c66cc62b6c61ba745e2baf51c41a50970a08d508 Mon Sep 17 00:00:00 2001
From: sternenseemann <sternenseemann@systemli.org>
Date: Fri, 6 Aug 2021 02:46:16 +0200
Subject: [PATCH] haskellPackages.ats-format: ignore custom Setup.hs, install
 manually

ats-format has a custom Setup.hs which does the following using cli-setup:

* Add ~/.local/share/man to $MANPATH by editing shell configurations in $HOME.

* Install a man page into ~/.local/share

* Install a shell completion by editing shell configurations in $HOME.

We had a workaround to keep this from failing the build in the nix sandbox, but
this seemingly broke on darwin. To fix this once and forall, we force the use
of only `defaultMain` in Setup.hs and install the man page manually.
Additionally we generate completions and remove unnecessary extra references
from the closure.
---
 .../haskell-modules/configuration-common.nix  |  6 -----
 .../haskell-modules/configuration-nix.nix     | 25 +++++++++++++++++++
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 4b958c997a78..5d29d8554c0e 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1044,12 +1044,6 @@ self: super: {
   # Has tasty < 1.2 requirement, but works just fine with 1.2
   temporary-resourcet = doJailbreak super.temporary-resourcet;
 
-  # fake a home dir and capture generated man page
-  ats-format = overrideCabal super.ats-format (old : {
-    preConfigure = "export HOME=$PWD";
-    postBuild = "mv .local/share $out";
-  });
-
   # Test suite doesn't work with current QuickCheck
   # https://github.com/pruvisto/heap/issues/11
   heap = dontCheck super.heap;
diff --git a/pkgs/development/haskell-modules/configuration-nix.nix b/pkgs/development/haskell-modules/configuration-nix.nix
index ef0bd0656ffd..8cd325db9063 100644
--- a/pkgs/development/haskell-modules/configuration-nix.nix
+++ b/pkgs/development/haskell-modules/configuration-nix.nix
@@ -919,4 +919,29 @@ self: super: builtins.intersectAttrs super {
   # Flag added in Agda 2.6.2
   Agda = appendConfigureFlag super.Agda "-foptimise-heavily";
 
+  # ats-format uses cli-setup in Setup.hs which is quite happy to write
+  # to arbitrary files in $HOME. This doesn't either not achieve anything
+  # or even fail, so we prevent it and install everything necessary ourselves.
+  # See also: https://hackage.haskell.org/package/cli-setup-0.2.1.4/docs/src/Distribution.CommandLine.html#setManpathGeneric
+  ats-format = generateOptparseApplicativeCompletion "atsfmt" (
+    justStaticExecutables (
+      overrideCabal super.ats-format (drv: {
+        # use vanilla Setup.hs
+        preCompileBuildDriver = ''
+          cat > Setup.hs << EOF
+          module Main where
+          import Distribution.Simple
+          main = defaultMain
+          EOF
+        '' + (drv.preCompileBuildDriver or "");
+        # install man page
+        buildTools = [
+          pkgs.buildPackages.installShellFiles
+        ] ++ (drv.buildTools or []);
+        postInstall = ''
+          installManPage man/atsfmt.1
+        '' + (drv.postInstall or "");
+      })
+    )
+  );
 }