simple-live-app: add update script

pkgs/by-name/si/simple-live-app/package.nix

@@ -53,6 +53,8 @@ flutter324.buildFlutterApplication rec {
     --prefix LD_LIBRARY_PATH : $out/app/simple-live-app/lib
   '';
 
+  passthru.updateScript = ./update.sh;
+
   meta = {
     description = "Simply Watch Live";
     homepage = "https://github.com/xiaoyaocz/dart_simple_live";

pkgs/by-name/si/simple-live-app/update.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p yq nix bash coreutils nix-update common-updater-scripts ripgrep flutter
+
+set -eou pipefail
+
+PACKAGE_DIR="$(realpath "$(dirname "$0")")"
+cd "$PACKAGE_DIR"/..
+while ! test -f flake.nix; do cd ..; done
+NIXPKGS_DIR="$PWD"
+
+latestVersion=$(
+    list-git-tags --url=https://github.com/xiaoyaocz/dart_simple_live |
+        rg '^v(.*)' -r '$1' |
+        sort --version-sort |
+        tail -n1
+)
+
+currentVersion=$(nix-instantiate --eval -E "with import ./. {}; simple-live-app.version or (lib.getVersion simple-live-app)" | tr -d '"')
+
+if [[ "$currentVersion" == "$latestVersion" ]]; then
+    echo "package is up-to-date: $currentVersion"
+    exit 0
+fi
+
+nix-update --version=$latestVersion simple-live-app
+
+export HOME="$(mktemp -d)"
+src="$(nix-build --no-link "$NIXPKGS_DIR" -A simple-live-app.src)"
+TMPDIR="$(mktemp -d)"
+cp --recursive --no-preserve=mode "$src"/* $TMPDIR
+cd "$TMPDIR"/simple_live_app
+flutter pub get
+yq . pubspec.lock >"$PACKAGE_DIR"/pubspec.lock.json
+rm -rf $TMPDIR