Delete a bunch of unused strings

Co-authored-by: Jamie Kyle <jamie@signal.org>

ts/scripts/mark-unused-strings-deleted.ts

@@ -0,0 +1,75 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+import { spawnSync } from 'node:child_process';
+import path from 'node:path';
+import { readFileSync, writeFileSync } from 'node:fs';
+import { DELETED_REGEXP } from './constants';
+
+const rootDir = path.resolve(__dirname, '..', '..');
+const messagesPath = path.join(rootDir, '_locales/en/messages.json');
+
+function getIcuLikeStrings(): Set<string> {
+  const { status, stdout } = spawnSync(
+    'grep',
+    [
+      // Match 'icu:Example__Element--StateAnd123'
+      '--extended-regexp',
+      'icu:[a-zA-Z0-9_.-]+',
+      // Each line should just be the ICU message name without any noise
+      '--no-filename',
+      '--only-matching',
+      // Search in these folders
+      '--recursive',
+      'ts/',
+      'app/',
+    ],
+    {
+      cwd: rootDir,
+      stdio: ['ignore', 'pipe', 'inherit'],
+      encoding: 'utf-8',
+    }
+  );
+  if (status !== 0) {
+    throw new Error(`grep failed with status ${status}`);
+  }
+  return new Set(stdout.trim().split('\n'));
+}
+
+function getDateStr(date: Date) {
+  const year = String(date.getFullYear());
+  const month = String(date.getMonth() + 1).padStart(2, '0');
+  const day = String(date.getDate()).padStart(2, '0');
+  return `${year}/${month}/${day}`;
+}
+
+const dateStr = getDateStr(new Date());
+const lines = getIcuLikeStrings();
+const messages = JSON.parse(readFileSync(messagesPath, 'utf-8'));
+let deletedCount = 0;
+for (const key of Object.keys(messages)) {
+  const message = messages[key];
+  if (key === 'smartling') {
+    continue;
+  }
+  if (message.ignoreUnused) {
+    continue;
+  }
+  if (DELETED_REGEXP.test(message.description)) {
+    continue;
+  }
+  if (!lines.has(key)) {
+    deletedCount += 1;
+    console.log(`Marking ${key} as deleted`);
+    if (message.description) {
+      message.description = `(Deleted ${dateStr}) ${message.description}`;
+    } else {
+      message.description = `(Deleted ${dateStr})`;
+    }
+  }
+}
+if (deletedCount === 0) {
+  console.log('No strings to delete');
+} else {
+  writeFileSync(messagesPath, `${JSON.stringify(messages, null, 2)}\n`);
+  console.log(`Marked ${deletedCount} strings as deleted`);
+}