Move desktop-related code to "desktop" subfolder (#872)

Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/872
Move all the JS code related to desktop app to "desktop" subfolder.

The structure of "desktop" folder:
- `src` - JS code of Flipper desktop app executing in Electron Renderer (Chrome) process. This folder also contains all the Flipper plugins in subfolder "src/plugins".
- `static` - JS code of Flipper desktop app bootstrapping executing in Electron Main (Node.js) process
- `pkg` - Flipper packaging lib and CLI tool
- `doctor` - Flipper diagnostics lib and CLI tool
- `scripts` - Build scripts for Flipper desktop app
- `headless` - Headless version of Flipper app
- `headless-tests` - Integration tests running agains Flipper headless version

Reviewed By: passy

Differential Revision: D20249304

fbshipit-source-id: 9a51c63b51b92b758a02fc8ebf7d3d116770efe9

desktop/scripts/generate-changelog.js

@@ -0,0 +1,76 @@
+#!/usr/bin/env node
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noformat
+ */
+
+/**
+ * WARNING: this file should be able to run on node v6.16.0, which is used at SandCastle.
+ * Please run `nvm use 6.16.0` before testing changes in this file!
+ */
+
+const path = require('path');
+const fs = require('fs');
+const cp = require('child_process');
+
+const desktopRoot = path.resolve(__dirname, '..');
+const root = path.resolve(desktopRoot, '..');
+
+const version = JSON.parse(fs.readFileSync(path.join(desktopRoot, 'package.json'), 'utf8')).version;
+
+const now = new Date();
+const date = `${now.getDate()}/${now.getMonth() + 1}/${now.getFullYear()}`;
+const newlineMarker = '__NEWLINE_MARKER__';
+const fChangelog = path.resolve(root, 'CHANGELOG.md');
+
+const lastCommit = cp
+  .execSync(`hg log --limit 1 --template '{node}'`, {cwd: root})
+  .toString();
+const firstCommit = cp
+  .execSync(
+    `hg log --limit 1 --template '{node}' --keyword 'Flipper Release: v'`,
+    {cwd: root}
+  )
+  .toString();
+
+console.log(
+  `Generating changelog for version ${version} based on ${firstCommit}..${lastCommit}`
+);
+
+// # get all commit summaries since last release | find all changelog entries, but make sure there is only one line per commit by temporarily replacing newlines
+const hgLogCommand = `hg log -r "${firstCommit}::${lastCommit} and file('../*')" --template "{phabdiff} - {sub('\n','${newlineMarker}', desc)}\n"`;
+const hgLog = cp.execSync(hgLogCommand, {cwd: __dirname}).toString();
+
+const diffRe = /^D\d+/;
+const changeLogLineRe = /(^changelog:\s*?)(.*?)$/i;
+
+let contents = `# ${version} (${date})\n\n`;
+let changes = 0;
+
+hgLog
+  .split('\n')
+  .filter(line => diffRe.test(line))
+  .forEach(line => {
+    // Grab the diff nr from every line in the output
+    const diff = line.trim().match(diffRe)[0];
+    // unfold the lines generated by hg log again
+    line.split(newlineMarker).forEach(diffline => {
+      // if a line starts with changelog:, grab the rest of the text and add it to the changelog
+      const match = diffline.match(changeLogLineRe);
+      if (match) {
+        changes++;
+        contents += ` * ${diff} - ${match[2]}\n`;
+      }
+    });
+  });
+
+if (!changes) {
+  console.log('No diffs with changelog items found in this release');
+} else {
+  contents += '\n\n' + fs.readFileSync(fChangelog, 'utf8');
+  fs.writeFileSync(fChangelog, contents);
+}