WIP stage redesign

garlic/tools.nix

@@ -0,0 +1,44 @@
+{
+  stdenv
+}:
+
+with stdenv.lib;
+
+let
+  gen = rec {
+    # genAttrSets "a" ["hello" "world"]
+    # [ { a = "hello"; } { a = "world"; } ]
+    genAttrSets = (name: arr: (map (x: {${name}=x; })) arr);
+
+    # addAttrSets "a" [1 2] {e=4;}
+    # [ { a = 1; e = 4; } { a = 2; e = 4; } ]
+    addAttrSets = (name: arr: set: (map (x: set // {${name}=x; })) arr);
+
+    # attrToList {a=1;}
+    # [ { name = "a"; value = 1; } ]
+    attrToList = (set: map (name: {name=name; value=set.${name};} ) (builtins.attrNames set));
+
+    # mergeConfig [{e=1;}] {name="a"; value=[1 2]
+    # [ { a = 1; e = 1; } { a = 2; e = 1; } ]
+    mergeConfig = (arr: new: flatten ( map (x: addAttrSets new.name new.value x) arr));
+
+    # genConfigs {a=[1 2]; b=[3 4];}
+    # [ { a = 1; b = 3; } { a = 1; b = 4; } { a = 2; b = 3; } { a = 2; b = 4; } ]
+    genConfigs = (config: foldl mergeConfig [{}] (attrToList config));
+
+    # Generate multiple app versions by override with each config
+    genApp = (app: configs: map (conf: app.override conf // {conf=conf;}) configs);
+
+    # Generate app version from an array of apps
+    genApps = (apps: configs:
+      flatten (map (app: genApp app configs) apps));
+
+    /* Returns the path of the executable of a stage */
+    stageProgram = stage:
+      if stage ? programPath
+      then "${stage}${stage.programPath}"
+      else "${stage}";
+
+  };
+in
+  gen