From afd204905e4c3b437b575167d1fdfff47aca39ea Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Wed, 8 Feb 2023 08:24:36 +0000
Subject: [PATCH] vifm: fix `:help` by pulling in `perl` to build depends

Without the change `:help` command failed to find the help as:

    $ rm -rfv ~/.config/vifm/ ~/.vifm
    $ vifm
    <in vifm>:help
    Error detected while processing command line:
    E149: Sorry, no help for vifm-app.txt

This happened because `tags` in `doc` directory was empty:

    $(top_srcdir)/data/vim/doc/plugin/tags: \
                               $(top_srcdir)/data/vim/doc/plugin/vifm-plugin.txt
        $(AM_V_GEN)mkdir -p ../data/vim/doc/plugin/; \
        if [ -n "$(PERL)" ]; then \
                $(srcdir)/helpztags "$(top_srcdir)/data/vim/doc/plugin"; \
        elif [ -n "$(VIM)" ]; then \
                vim -e -s -c 'helptags $(top_srcdir)/data/vim/doc/plugin|q'; \
        else \
                touch $@; \
        fi

The change pulls in `perl` into build depends to get tags working.
---
 pkgs/applications/file-managers/vifm/default.nix | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkgs/applications/file-managers/vifm/default.nix b/pkgs/applications/file-managers/vifm/default.nix
index ad326e459775..55a7ebd84afc 100644
--- a/pkgs/applications/file-managers/vifm/default.nix
+++ b/pkgs/applications/file-managers/vifm/default.nix
@@ -1,4 +1,5 @@
 { stdenv, fetchurl, makeWrapper
+, perl # used to generate help tags
 , pkg-config
 , ncurses, libX11
 , util-linux, file, which, groff
@@ -17,9 +18,14 @@ in stdenv.mkDerivation rec {
     sha256 = "sha256-j+KBPr3Mz+ma7OArBdYqIJkVJdRrDM+67Dr2FMZlVog=";
   };
 
-  nativeBuildInputs = [ pkg-config makeWrapper ];
+  nativeBuildInputs = [ perl pkg-config makeWrapper ];
   buildInputs = [ ncurses libX11 util-linux file which groff ];
 
+  postPatch = ''
+    # Avoid '#!/usr/bin/env perl' reverences to build help.
+    patchShebangs --build src/helpztags
+  '';
+
   postFixup = let
     path = lib.makeBinPath
       [ udisks2