cvise: fix shebang for --command= option

Upstream `cvise` changed the way it encodes shebang from hardcoded value
to `/bin` + value:

d99d82ce8e

This broke `nixpkgs` substitute hack and broke the option.

I proposed upstream to use `/usr/bin/env bash` indirection instead. This
change pulls in this proposed change.

pkgs/development/tools/misc/cvise/default.nix

@@ -1,6 +1,7 @@
 { lib
 , buildPythonApplication
 , fetchFromGitHub
+, fetchpatch
 , bash
 , cmake
 , colordiff
@@ -29,6 +30,14 @@ buildPythonApplication rec {
   patches = [
     # Refer to unifdef by absolute path.
     ./unifdef.patch
+
+    # Refer to shell via /usr/bin/env:
+    #   https://github.com/marxin/cvise/pull/121
+    (fetchpatch {
+      name = "env-shell.patch";
+      url = "https://github.com/marxin/cvise/commit/6a416eb590be978a2ad25c610974fdde84e88651.patch";
+      hash = "sha256-Kn6+TXP+wJpMs6jrgsa9OwjXf6vmIgGzny8jg3dfKWA=";
+    })
   ];
 
   postPatch = ''
@@ -37,10 +46,6 @@ buildPythonApplication rec {
     substituteInPlace CMakeLists.txt \
       --replace " -Werror " " "
 
-    # 'cvise --command=...' generates a script with hardcoded shebang.
-    substituteInPlace cvise.py \
-      --replace "#!/bin/bash" "#!${bash}/bin/bash"
-
     substituteInPlace cvise/utils/testing.py \
       --replace "'colordiff --version'" "'${colordiff}/bin/colordiff --version'" \
       --replace "'colordiff'" "'${colordiff}/bin/colordiff'"