protoc-gen-dart: add passthru.updateScript

pkgs/development/tools/protoc-gen-dart/default.nix

@@ -17,6 +17,8 @@ buildDartApplication rec {
 
   pubspecLock = lib.importJSON ./pubspec.lock.json;
 
+  passthru.updateScript = ./update.sh;
+
   meta = with lib; {
     description = "Protobuf plugin for generating Dart code";
     mainProgram = "protoc-gen-dart";

pkgs/development/tools/protoc-gen-dart/update.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p yq ripgrep common-updater-scripts dart
+
+set -xeu -o pipefail
+
+PACKAGE_DIR="$(realpath "$(dirname "$0")")"
+cd "$PACKAGE_DIR/.."
+while ! test -f flake.nix; do cd .. ; done
+NIXPKGS_DIR="$PWD"
+
+version="$(
+  list-git-tags --url=https://github.com/google/protobuf.dart \
+  | rg '^protobuf-v(.*)' -r '$1' \
+  | sort --version-sort \
+  | tail -n1
+)"
+
+cd "$NIXPKGS_DIR"
+update-source-version protoc-gen-dart "$version"
+
+TMPDIR="$(mktemp -d)"
+cd "$TMPDIR"
+
+src="$(nix-build --no-link "$NIXPKGS_DIR" -A protoc-gen-dart.src)/protoc_plugin"
+cp $src/pubspec.* .
+
+if ! test -f pubspec.lock; then
+  dart pub update
+fi
+
+yq . pubspec.lock > "$PACKAGE_DIR/pubspec.lock.json"
+
+rm -rf "$TMPDIR"