maintenance (scripts/i18n) Create run-all i18n script (#22873)

* Create run-all i18n script

* error checking

* add more documentation

scripts/i18n/README.md

@@ -70,3 +70,13 @@ When run, the script will:
 - Pulls the latest version of `gatsby-i18n-source`.
 - Creates a "sync" pull request that updates all files that do not contain conflicts from the merge.
 - Creates a "conflicts" pull request that contains all merge conflicts, with instructions on how to resolve them.
+
+### `run-all`
+
+Usage:
+
+```shell
+yarn run-all [script name]
+```
+
+The `run-all` script runs the script provided in the argument across all languages for which there are translations of gatbyjs.org, listed in /www/src/i18n.json.

scripts/i18n/package.json

@@ -4,6 +4,7 @@
   "description": "Scripts for gatsby internationalization",
   "scripts": {
     "create": "node ./create.js",
+    "run-all": "node ./run-all.js",
     "sync": "node ./sync.js",
     "update-source": "node ./update-source.js"
   },

scripts/i18n/run-all.js

@@ -0,0 +1,21 @@
+// Run the provided script on all valid repos
+const fs = require(`fs`)
+const log4js = require(`log4js`)
+const shell = require(`shelljs`)
+let logger = log4js.getLogger(`run-all`)
+
+require(`dotenv`).config()
+
+function runAll(script) {
+  if (!script) {
+    logger.error(`Usage: yarn run-all <script-name>`)
+    process.exit(1)
+  }
+  const langs = JSON.parse(fs.readFileSync(`../../www/i18n.json`))
+  for (const { code } of langs) {
+    shell.exec(`yarn ${script} ${code}`)
+  }
+}
+
+const [script] = process.argv.slice(2)
+runAll(script)