Merge pull request #832 from marcusramberg/marcus/perl-packages

perl: Add support for packages attribute.

examples/perl/devenv.nix

@@ -0,0 +1,9 @@
+_:
+
+{
+  languages.perl.enable = true;
+  languages.perl.packages = [ "Mojolicious" "Text::Markdown::Hoedown" ];
+  enterShell = ''
+    perl -MText::Markdown::Hoedown -Mojo -e 'say c(1,2,markdown("hey"))->join(" ")'
+  '';
+}

examples/perl/devenv.yaml

@@ -0,0 +1,3 @@
+inputs:
+  nixpkgs:
+    url: github:NixOS/nixpkgs/nixpkgs-unstable

src/modules/languages/perl.nix

@@ -6,11 +6,20 @@ in
 {
   options.languages.perl = {
     enable = lib.mkEnableOption "tools for Perl development";
+    packages = lib.mkOption
+      {
+        type = lib.types.listOf lib.types.str;
+        description = "Perl packages to include";
+        default = [ ];
+        example = [ "Mojolicious" ];
+      };
   };
 
   config = lib.mkIf cfg.enable {
     packages = with pkgs; [
-      perl
+      (perl.withPackages (p: (with builtins; map
+        (pkg: p.${ replaceStrings [ "::" ] [ "" ] pkg })
+        cfg.packages)))
     ];
   };
 }