flclash: add update script

Author: nayeko

pkgs/by-name/fl/flclash/package.nix

@@ -96,6 +96,8 @@ flutter324.buildFlutterApplication {
     install -Dm644 ./assets/images/icon.png $out/share/pixmaps/flclash.png
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = {
     description = "Multi-platform proxy client based on ClashMeta, simple and easy to use, open-source and ad-free";
     homepage = "https://github.com/chen08209/FlClash";

pkgs/by-name/fl/flclash/update.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -I nixpkgs=./. -i bash -p curl gnused jq yq nix bash coreutils nix-update
+
+set -eou pipefail
+
+ROOT="$(dirname "$(readlink -f "$0")")"
+
+latestTag=$(curl ${GITHUB_TOKEN:+-u ":$GITHUB_TOKEN"} -sL https://api.github.com/repos/chen08209/FlClash/releases/latest | jq --raw-output .tag_name)
+latestVersion=$(echo "$latestTag" | sed 's/^v//')
+
+currentVersion=$(nix-instantiate --eval -E "with import ./. {}; flclash.version or (lib.getVersion flclash)" | tr -d '"')
+
+if [[ "$currentVersion" == "$latestVersion" ]]; then
+    echo "package is up-to-date: $currentVersion"
+    exit 0
+fi
+
+nix-update --subpackage libclash flclash
+
+curl https://raw.githubusercontent.com/chen08209/FlClash/${latestTag}/pubspec.lock | yq . >$ROOT/pubspec.lock.json