refactor

Signed-off-by: Harald Hoyer <harald@hoyer.xyz>

packages/nixos-revision/default.nix

@@ -0,0 +1,73 @@
+{ pkgs
+, lib
+, gitHostCommitUrl ? "https://github.com/jakehamilton/config/commit"
+, ...
+}:
+
+let
+  inherit (lib.plusultra) override-meta;
+
+  new-meta = with lib; {
+    description = "A helper show the current git revision of the system configuration.";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ jakehamilton ];
+  };
+
+  package =
+    pkgs.writeShellScriptBin "nixos-revision" ''
+      HAS_HELP=false
+      HAS_OPEN=false
+
+      while [[ $# -gt 0 ]]; do
+      	case $1 in
+      		-h|--help)
+      			HAS_HELP=true
+      			shift
+      			;;
+      		-o|--open)
+      			HAS_OPEN=true
+      			shift
+      			;;
+      		*)
+      			shift
+      			;;
+      	esac
+      done
+
+      if [ $HAS_HELP == true ]; then
+      	HELP_MSG="
+      nixos-revision
+
+      USAGE
+
+        nixos-revision [options]
+
+      OPTIONS
+
+        -h, --help              Show this help message
+        -o, --open              Open the revision on GitHub
+
+      EXAMPLES
+
+        $ # Print the current revision
+        $ nixos-revision
+
+        $ # Open the current revision on GitHub
+        $ nixos-revision --open
+      "
+      	echo "$HELP_MSG"
+        exit 0
+      fi
+
+      REVISION=$(nixos-version --json | ${pkgs.jq}/bin/jq -r .configurationRevision)
+
+      if [ $HAS_OPEN == true ]; then
+        GITHUB_URL="${gitHostCommitUrl}/$REVISION"
+        echo "Opening URL: $GITHUB_URL"
+        ${pkgs.xdg-utils}/bin/xdg-open $GITHUB_URL
+      else
+        echo $REVISION
+      fi
+    '';
+in
+override-meta new-meta package