Add git-graph script

modules/home-manager/cli/git.nix

@@ -170,6 +170,7 @@ in
     home = {
       packages = with pkgs; [
         git-extras
+        git-graph
         git-trim
         stable.git-instafix
       ];

packages/default.nix

@@ -12,6 +12,7 @@ in
   create-script = callPackage ./create-script.nix { };
   dev-commit = callPackage ./dev-commit.nix { };
   displayselect = callPackage ./displayselect { };
+  git-graph = callPackage ./git-graph.nix { };
   mounter = callPackage ./mounter.nix { };
   move-firefox-screenshots = callPackage ./move-firefox-screenshots.nix { };
   notes = callPackage ./notes { };

packages/git-graph.nix

@@ -0,0 +1,17 @@
+{ pkgs }:
+
+pkgs.writeShellApplication {
+  name = "git-graph";
+
+  runtimeInputs = with pkgs; [ git ];
+
+  text = ''
+    # Based on https://github.com/sdaschner/dotfiles/blob/master/bin/git-graph.
+
+    git log \
+      --abbrev-commit \
+      --all \
+      --graph \
+      --pretty=format:"%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%ae>%Creset"
+  '';
+}