git: support multiple values

Closes #614

modules/programs/git.nix

@@ -6,11 +6,22 @@ let
 
   cfg = config.programs.git;
 
+  # generation for multiple ini values
+  mkKeyValue = k: v:
+    let
+      mkKeyValue = generators.mkKeyValueDefault {} "=" k;
+    in
+      concatStringsSep "\n" (map mkKeyValue (toList v));
+
+  gitToIni = generators.toINI { inherit mkKeyValue; };
+
   gitIniType = with types;
     let
-      primitiveType = either bool (either int str);
+      primitiveType = either str (either bool int);
+      multipleType = either primitiveType (listOf primitiveType);
+      sectionType = attrsOf multipleType;
     in
-      attrsOf (attrsOf primitiveType);
+      attrsOf sectionType;
 
   signModule = types.submodule {
     options = {
@@ -64,7 +75,7 @@ let
     };
 
     config.path = mkIf (config.contents != {}) (
-      mkDefault (pkgs.writeText "contents" (generators.toINI {} config.contents))
+      mkDefault (pkgs.writeText "contents" (gitToIni config.contents))
     );
   });
 
@@ -175,7 +186,7 @@ in
         };
 
         xdg.configFile = {
-          "git/config".text = generators.toINI {} cfg.iniContent;
+          "git/config".text = gitToIni cfg.iniContent;
 
           "git/ignore" = mkIf (cfg.ignores != []) {
             text = concatStringsSep "\n" cfg.ignores + "\n";

tests/modules/programs/git-expected.conf

@@ -8,6 +8,8 @@ gpgSign=true
 [extra]
 boolean=true
 integer=38
+multiple=1
+multiple=2
 name=value
 
 [filter "lfs"]

tests/modules/programs/git.nix

@@ -31,6 +31,7 @@ in
         extraConfig = {
           extra = {
             name = "value";
+            multiple = [1];
           };
         };
         ignores = [ "*~" "*.swp" ];
@@ -59,6 +60,7 @@ in
         aliases.a2 = mkForce "baz";
         extraConfig.extra.boolean = true;
         extraConfig.extra.integer = 38;
+        extraConfig.extra.multiple = [2];
       }
     ];