From 1fc3e769e3db7100798bb8c6f5f9ed6c5b85abc2 Mon Sep 17 00:00:00 2001
From: Peter Simons <simons@cryp.to>
Date: Tue, 18 Aug 2015 12:59:36 +0200
Subject: [PATCH] haskell-hindent: byte-compile installed elisp code

---
 .../haskell-modules/configuration-common.nix    | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index e38318ada51c..66bf20c55c95 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -969,4 +969,21 @@ self: super: {
     '';
   });
 
+  # Byte-compile elisp code for Emacs.
+  hindent = overrideCabal super.hindent (drv: {
+    executableToolDepends = drv.executableToolDepends or [] ++ [pkgs.emacs];
+    postInstall = ''
+      local lispdir=( "$out/share/"*"-${self.ghc.name}/${drv.pname}-${drv.version}/elisp" )
+      pushd >/dev/null $lispdir
+      for i in *.el; do
+        emacs -Q -L . -L ${pkgs.emacs24Packages.haskellMode}/share/emacs/site-lisp \
+          --batch --eval "(byte-compile-disable-warning 'cl-functions)" \
+          -f batch-byte-compile $i
+      done
+      popd >/dev/null
+      mkdir -p $out/share/emacs
+      ln -s $lispdir $out/share/emacs/site-lisp
+    '';
+  });
+
 }