Starting to add tool builder. Extracting bundler file computation.

pkgs/development/ruby-modules/bundled-common/default.nix

@@ -7,10 +7,10 @@
 {
   name
 , pname ? name
+, gemdir
 , gemfile
 , lockfile
 , gemset
-, gemdir
 , ruby ? defs.ruby
 , gemConfig ? defaultGemConfig
 , postBuild ? null

pkgs/development/ruby-modules/bundled-common/functions.nix

@@ -1,5 +1,25 @@
 { lib, gemConfig, ... }:
 rec {
+  bundlerFiles = {
+    gemfile ? null
+  , lockfile ? null
+  , gemset ? null
+  , gemdir ? null
+  , ...
+  }: {
+    gemfile =
+    if gemfile == null then assert gemdir != null; gemdir + "/Gemfile"
+    else gemfile;
+
+    lockfile =
+    if lockfile == null then assert gemdir != null; gemdir + "/Gemfile.lock"
+    else lockfile;
+
+    gemset =
+    if gemset == null then assert gemdir != null; gemdir + "/gemset.nix"
+    else gemset;
+  };
+
   filterGemset = {ruby, groups,...}@env: gemset: lib.filterAttrs (name: attrs: platformMatches ruby attrs && groupMatches groups attrs) gemset;
 
   platformMatches = {rubyEngine, version, ...}@ruby: attrs: (

pkgs/development/ruby-modules/bundled-common/test.nix

@@ -7,7 +7,34 @@ let
   functions = (import ./functions.nix testConfigs);
 in
   builtins.concatLists [
-    (test.run "Filter empty gemset" {} (set: functions.filterGemset {inherit ruby; groups = ["default"]; } set == {}))
+    ( test.run "All set, no gemdir" (functions.bundlerFiles {
+      gemfile  = test/Gemfile;
+      lockfile = test/Gemfile.lock;
+      gemset   = test/gemset.nix;
+    }) {
+      gemfile  = should.equal test/Gemfile;
+      lockfile = should.equal test/Gemfile.lock;
+      gemset   = should.equal test/gemset.nix;
+    })
+
+    ( test.run "Just gemdir" (functions.bundlerFiles {
+      gemdir = test/.;
+    }) {
+      gemfile  = should.equal test/Gemfile;
+      lockfile = should.equal test/Gemfile.lock;
+      gemset   = should.equal test/gemset.nix;
+    })
+
+    ( test.run "Gemset and dir" (functions.bundlerFiles {
+      gemdir = test/.;
+      gemset = test/extraGemset.nix;
+    }) {
+      gemfile  = should.equal test/Gemfile;
+      lockfile = should.equal test/Gemfile.lock;
+      gemset   = should.equal test/extraGemset.nix;
+    })
+
+    ( test.run "Filter empty gemset" {} (set: functions.filterGemset {inherit ruby; groups = ["default"]; } set == {}))
     ( let gemSet = { test = { groups = ["x" "y"]; }; };
       in
       test.run "Filter matches a group" gemSet (set: functions.filterGemset {inherit ruby; groups = ["y" "z"];} set == gemSet))