Add --version flag for protoc-gen-js

This flag is intended to be used directly against protoc-gen-js
(e.g. protoc-gen-js --version) as opposed to being passed to the
plugin via protoc.

Additionally, in order to make version updating a bit easier (and more
consistent), we also script version management based on the top-level
package.json.

Author: dibenede

BUILD.bazel

@@ -1,11 +1,13 @@
-# Protobuf JS runtime
+# Protobuf JavaScript runtime
 #
 # See also code generation logic under generator/
 
 load("@rules_pkg//:mappings.bzl", "pkg_attributes", "pkg_files", "strip_prefix")
 load("@rules_pkg//:pkg.bzl", "pkg_tar", "pkg_zip")
 load("//:protobuf_javascript_release.bzl", "package_naming")
 
+exports_files(["generate-version-header.js", "package.json"])
+
 config_setting(
     name = "x64_x86_windows",
     values = {"cpu": "x64_x86_windows"},
@@ -55,7 +57,7 @@ pkg_files(
     srcs = glob([
         "google/protobuf/*.js",
         "google/protobuf/compiler/*.js"
-    ]) + [
+    ], allow_empty = True) + [
         "google-protobuf.js",
         "package.json",
         "README.md",

MODULE.bazel.lock

@@ -11,7 +11,7 @@
     "LICENSE.md"
   ],
   "dependencies": {
-    "google-protobuf": "file:../google-protobuf-3.21.4.tgz"
+    "google-protobuf": "file:../google-protobuf-4.0.0.tgz"
   },
   "author": "Google Protocol Buffers Team",
   "license": "BSD-3-Clause"

conformance/package.json

@@ -0,0 +1,14 @@
+const fs = require('fs');
+const path = require('path');
+
+const version = require('./package.json').version;
+const headerContent = `// Generated by generate-version-header.js
+#ifndef PROTOBUF_JAVASCRIPT_VERSION_H__
+#define PROTOBUF_JAVASCRIPT_VERSION_H__
+
+const char* const kProtobufJavascriptVersion = "${version}";
+
+#endif  // PROTOBUF_JAVASCRIPT_VERSION_H__
+`;
+
+fs.writeFileSync(process.argv[2], headerContent);

generate-version-header.js

@@ -1,3 +1,11 @@
+genrule(
+    name = "generate_version_header",
+    srcs = ["//:package.json"],
+    outs = ["version.h"],
+    cmd = "node $(location //:generate-version-header.js) $(OUTS)",
+    tools = ["//:generate-version-header.js"],
+)
+
 cc_binary(
     name = "protoc-gen-js",
     srcs = [
@@ -6,6 +14,7 @@ cc_binary(
         "protoc-gen-js.cc",
         "well_known_types_embed.cc",
         "well_known_types_embed.h",
+        ":version.h",
     ],
     visibility = ["//visibility:public"],
     deps = [

generator/BUILD.bazel

@@ -29,10 +29,19 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <google/protobuf/compiler/plugin.h>
+#include <iostream>
+#include <string>
 
 #include "generator/js_generator.h"
+#include "generator/version.h"
 
 int main(int argc, char** argv) {
+  for (int i = 1; i < argc; ++i) {
+    if (std::string(argv[i]) == "--version") {
+      std::cout << "protoc-gen-js version " << kProtobufJavascriptVersion << std::endl;
+      return 0;
+    }
+  }
   std::unique_ptr<google::protobuf::compiler::CodeGenerator> generator(
       new google::protobuf::compiler::js::Generator());
   return google::protobuf::compiler::PluginMain(argc, argv, generator.get());

generator/protoc-gen-js.cc

@@ -21,6 +21,7 @@
     "jasmine": "~3.5.0"
   },
   "scripts": {
+    "prebuild": "node update-bazel-versions.js",
     "build": "node ./node_modules/gulp/bin/gulp.js dist",
     "test": "node ./node_modules/gulp/bin/gulp.js test",
     "clean": "node ./node_modules/gulp/bin/gulp.js clean"

package.json

@@ -0,0 +1,28 @@
+const fs = require('fs');
+const path = require('path');
+
+const version = require('./package.json').version;
+
+// Update MODULE.bazel
+const moduleBazelPath = path.join(__dirname, 'MODULE.bazel');
+let moduleBazelContent = fs.readFileSync(moduleBazelPath, 'utf8');
+moduleBazelContent = moduleBazelContent.replace(/version = ".*"/, `version = "${version}"`);
+fs.writeFileSync(moduleBazelPath, moduleBazelContent);
+
+// Update protobuf_javascript_release.bzl
+const releaseBzlPath = path.join(__dirname, 'protobuf_javascript_release.bzl');
+let releaseBzlContent = fs.readFileSync(releaseBzlPath, 'utf8');
+releaseBzlContent = releaseBzlContent.replace(/_PROTOBUF_JAVASCRIPT_VERSION = ".*"/, `_PROTOBUF_JAVASCRIPT_VERSION = "${version}"`);
+fs.writeFileSync(releaseBzlPath, releaseBzlContent);
+
+// Update conformance/package.json
+const conformancePackageJsonPath =
+    path.join(__dirname, 'conformance', 'package.json');
+let conformancePackageJsonContent =
+    fs.readFileSync(conformancePackageJsonPath, 'utf8');
+const conformancePackageJson = JSON.parse(conformancePackageJsonContent);
+conformancePackageJson.dependencies['google-protobuf'] =
+    `file:../google-protobuf-${version}.tgz`;
+fs.writeFileSync(
+    conformancePackageJsonPath,
+    JSON.stringify(conformancePackageJson, null, 2) + '\n');