Add dangerfile.js

.github/workflows/danger.yml

@@ -11,7 +11,5 @@ jobs:
       uses: actions/checkout@v1
     - name: Danger
       uses: danger/danger-js@9.1.8
-      with:
-        args: --dangerfile Dangerfile
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

dangerfile.js

@@ -0,0 +1,75 @@
+const { danger, fail, warn, schedule } = require('danger');
+const { readFileSync } = require('fs');
+
+const source_pattern = /(\.m|\.mm|\.h)$/;
+const modified_source_files = danger.git.modified_files.filter(f => source_pattern.test(f));
+const has_modified_source_files = (Array.isArray(modified_source_files) && modified_source_files.length > 0);
+const added_source_files = danger.git.created_files.filter(f => source_pattern.test(f));
+const has_added_source_files = (Array.isArray(added_source_files) && added_source_files.length > 0);
+
+// Make it more obvious that a PR is a work in progress and shouldn't be merged yet
+if (danger.github.pr.title.includes("[WIP]")) {
+  warn("PR is classed as Work in Progress");
+}
+
+// Warn when there is a big PR
+if (danger.github.pr.additions + danger.github.pr.deletions > 500) {
+  warn("This is a big PR, please consider splitting it up to ease code review.");
+}
+
+// Modifying the changelog will probably get overwritten.
+if (danger.git.modified_files.includes("CHANGELOG.md") && !danger.github.pr.title.includes("#changelog")) {
+  warn("PR modifies CHANGELOG.md, which is a generated file. Add #changelog to the title to suppress this warning.");
+}
+
+// Reference: http://a32.me/2014/03/heredoc-multiline-variable-with-javascript/
+function hereDoc(f) {
+  return f.toString().
+  replace(/^[^\/]+\/\*!?/, '').
+  replace(/\*\/[^\/]+$/, '');
+}
+
+function full_license(partial_license, filename) {
+  var license_header = hereDoc(function() {/*!
+//
+*/});
+  license_header += "//  " + filename;
+  license_header += hereDoc(function() {/*!
+//  Texture
+//*/});
+  license_header += partial_license;
+  return license_header;
+}
+
+function check_file_header(files_to_check, license) {
+  for (let file of files_to_check) {
+    const filename = file.replace(/^.*[\\\/]/, '');
+    schedule(async () => {
+      const content = await danger.github.utils.fileContents(file);
+      if (!content.includes("Pinterest, Inc.")) {
+        warn ("Please ensure license is correct for " + filename +":\n```" + full_license(license, filename) + "\n```");
+      }  
+    });
+  }   
+}
+
+const new_source_license_header = hereDoc(function() {/*!
+//  Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//*/});
+
+const modified_source_license_header = hereDoc(function() {/*!
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//*/});
+
+// Ensure new files have proper header
+if (has_added_source_files) {
+  check_file_header(added_source_files, new_source_license_header);
+}
+
+// Ensure modified files have proper header
+if (has_modified_source_files) {
+  check_file_header(modified_source_files, modified_source_license_header);
+}