chore: Split trace-anything into its own module

After running `npm install`, trace-anything.js is now a symlink into
the node_modules/ folder.

This change also replaces the build system with gulp, since it was
getting too complicated to update that shell script to create the
perfect zip file while dealing with symlinks.

Change-Id: I771b0856892454aa6961b408e09565c2150e2bf6

PUBLISHING.md

@@ -8,7 +8,7 @@ Preparing a version to publish:
 3. Commit the version number change.
 4. Tag the commit with the version number.
 5. Push commits and tags to github.
-6. Run `./package.sh` to generate a zip file for publication.
+6. Run `npm run build` to generate a zip file for publication.
 
 Publishing a new version:
 
@@ -24,5 +24,3 @@ Publishing a new version:
 10. If you are prompted to pay a one-time fee (which you should expense), sadly,
     it seems that your edits were lost and you must start again at step 2.
 
-TODO: Find a way to start the fee process before your first publication.
-

gulpfile.js

@@ -0,0 +1,47 @@
+/**
+ * Copyright 2021 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @fileoverview Build system based on Gulp.
+ */
+
+const gulp = require('gulp');
+const rename = require('gulp-rename');
+const zip = require('gulp-zip');
+
+/**
+ * @return {!Stream}
+ */
+function packageExtension() {
+  const version = require('./manifest.json').version;
+
+  const sources = gulp.src([
+    'LICENSE',
+    'README.md',
+    'icons/*',
+    'manifest.json',
+    '*.js',
+    '*.html',
+  ], {base: './'});
+
+  return sources
+      .pipe(rename((path) => {
+        path.dirname = `eme_logger/${path.dirname}`;
+      }))
+      .pipe(zip(`eme_logger-${version}.zip`))
+      .pipe(gulp.dest('.'));
+}
+
+// The default command for this gulpfile is just to package the extension.
+exports.default = packageExtension;