1 files changed, 49 insertions, 0 deletions
diff --git a/modules/home/riff.nix b/modules/home/riff.nix
new file mode 100644
index 0000000..3a3e748
--- /dev/null
+++ b/modules/home/riff.nix
@@ -0,0 +1,49 @@
+# TODO: Upstream this
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.programs.git.riff;
+  cfg' = config.programs.git;
+
+  exe = baseNameOf (lib.getExe cfg.package);
+in
+{
+  options.programs.git.riff = {
+    enable = lib.mkEnableOption "diff filtering through riff";
+    package = lib.mkPackageOption pkgs "riffdiff" { };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      {
+        assertion =
+          let
+            enabled = [
+              cfg'.delta.enable
+              cfg'.diff-so-fancy.enable
+              cfg'.difftastic.enable
+              cfg.enable
+            ];
+          in
+          lib.count lib.id enabled <= 1;
+        message = "Only one of 'programs.git.delta.enable' or 'programs.git.difftastic.enable' or 'programs.git.diff-so-fancy.enable' or `programs.git.riff.enable` can be set to true at the same time.";
+      }
+    ];
+
+    home.packages = [ cfg.package ];
+
+    programs.git.iniContent = {
+      pager = {
+        diff = exe;
+        log = exe;
+        show = exe;
+      };
+
+      interactive.diffFilter = exe + " --color=on";
+    };
+  };
+}