git: add option to define store names for generated include files (#3171)

This allows to use gitconfig/gitconfig-some-intent
as store path suffixes for the texts.

modules/programs/git.nix

@@ -130,10 +130,20 @@ let
           </citerefentry>.
         '';
       };
-    };
 
-    config.path = mkIf (config.contents != { })
-      (mkDefault (pkgs.writeText "contents" (gitToIni config.contents)));
+      contentSuffix = mkOption {
+        type = types.str;
+        default = "gitconfig";
+        description = ''
+          Nix store name for the git configuration text file,
+          when generating the configuration text from nix options.
+        '';
+
+      };
+    };
+    config.path = mkIf (config.contents != { }) (mkDefault
+      (pkgs.writeText (hm.strings.storeFileName config.contentSuffix)
+        (gitToIni config.contents)));
   });
 
 in {

tests/modules/programs/git/git-expected.conf

@@ -56,3 +56,6 @@
 
 [includeIf "gitdir:~/src/dir"]
 	path = "@git_include_path@"
+
+[includeIf "gitdir:~/src/otherproject"]
+	path = "@git_named_include_path@"

tests/modules/programs/git/git.nix

@@ -14,7 +14,9 @@ let
   substituteExpected = path:
     pkgs.substituteAll {
       src = path;
-      git_include_path = pkgs.writeText "contents"
+      git_include_path = pkgs.writeText "hm_gitconfig"
+        (builtins.readFile ./git-expected-include.conf);
+      git_named_include_path = pkgs.writeText "hm_gitconfigwork"
         (builtins.readFile ./git-expected-include.conf);
     };
 
@@ -46,6 +48,11 @@ in {
             condition = "gitdir:~/src/dir";
             contents = gitInclude;
           }
+          {
+            condition = "gitdir:~/src/otherproject";
+            contents = gitInclude;
+            contentSuffix = "gitconfig-work";
+          }
         ];
         signing = {
           gpgPath = "path-to-gpg";