Add nix packages for commit-patch and commit-patch buffer

Author: caldwell

commit-patch-buffer.nix

@@ -0,0 +1,22 @@
+with import <nixpkgs>{};
+with { commit-patch' = import ./commit-patch.nix; };
+
+{ commit-patch ? commit-patch'
+,  emacs ? pkgs.emacs-nox
+}:
+
+let
+  trivialBuild = pkgs.callPackage "${<nixpkgs>}/pkgs/build-support/emacs/trivial.nix" { emacs = emacs; };
+in
+
+trivialBuild {
+  pname = "commit-patch-buffer";
+  inherit (commit-patch) src version;
+
+  propagatedUserEnvPkgs = [ commit-patch patchutils ];
+
+  meta = {
+    inherit (commit-patch.meta) homepage license;
+    description = "Commit diff buffers using commit-patch";
+  };
+}

commit-patch.nix

@@ -0,0 +1,39 @@
+with import <nixpkgs> {};
+
+stdenv.mkDerivation rec {
+  name = "commit-patch";
+  version = "2.6.2";
+  src = fetchurl {
+    url    = "https://porkrind.org/commit-patch/commit-patch-${version}.tar.gz";
+    sha256 = "0v11vjyisk243zi0ym90bnqb229j7iaqx1lwqdkszxzn1yxwq4ck";
+  };
+
+  buildInputs = [ perl patchutils makeWrapper ];
+
+  phases = "unpackPhase installPhase postFixup";
+
+  installFlags = [ "PREFIX=$(out)" ];
+
+  # If it weren't fatpacked we could do this for IPC::Run:
+  # postFixup = ''
+  #   wrapProgram $out/bin/commit-patch --set PERL5LIB \
+  #   ${with perlPackages; makePerlPath ([
+  #     IPCRun
+  #   ])} \
+  #   --prefix PATH ":" \
+  #   "${lib.makeBinPath [ perl patchutils ]}"
+  # '';
+
+  postFixup = ''
+    perl -pi -e 's,#!/usr/bin/perl,#!${perl}/bin/perl,' $out/bin/commit-patch
+    wrapProgram $out/bin/commit-patch \
+    --prefix PATH ":" \
+    "${lib.makeBinPath [ perl patchutils ]}"
+  '';
+
+  meta = with lib; {
+    license = licenses.gpl2;
+    homepage = "https://porkrind.org/commit-patch";
+    description = "Commit patches to Darcs, Git, Mercurial, Bazaar, Monotone, Subversion, or CVS";
+  };
+}