Setup a i18n scanner command - Closes #769

.eslintrc

@@ -42,6 +42,7 @@
         "./features/*/*.js",
         "./src/**/stories.js",
         "./src/tests.js"
+        "./src/i18n-scanner.js"
         ]
       }
     ],

package.json

@@ -19,6 +19,7 @@
     "clean": "del app/dist -f",
     "eslint": "eslint ./src/ ./app/main.js ./features/",
     "storybook": "start-storybook -p 6006 -s ./src/",
+    "i18n-scanner": "node ./src/i18n-scanner.js",
     "build-storybook": "build-storybook"
   },
   "author": "Lisk Foundation <admin@lisk.io>, lightcurve GmbH <admin@lightcurve.io>",
@@ -87,6 +88,8 @@
     "exports-loader": "=0.6.3",
     "extract-text-webpack-plugin": "=2.1.2",
     "file-loader": "=0.9.0",
+    "glob": "=7.1.2",
+    "i18next-scanner": "=2.0.0",
     "imports-loader": "=0.6.5",
     "js-nacl": "=1.2.2",
     "json-loader": "=0.5.4",

src/i18n-scanner.js

@@ -0,0 +1,24 @@
+const fs = require('fs');
+const glob = require('glob');
+const Parser = require('i18next-scanner').Parser;
+
+const translationFunctionNames = ['i18next.t', 'props.t', 'this.props.t', 't'];
+const outputFilePath = './src/locales/en/common.json';
+
+const parser = new Parser();
+
+const customHandler = function (key) {
+  parser.set(key, key);
+};
+
+const files = glob.sync('./src/**/*.js', {});
+files.forEach((file) => {
+  const content = fs.readFileSync(file, 'utf-8');
+  parser.parseFuncFromString(content, { list: translationFunctionNames }, customHandler)
+});
+
+const translations = parser.get({ sort: true }).en.translation;
+const count = Object.keys(translations).length;
+const outputJSON = JSON.stringify(translations, null, 2);
+fs.writeFileSync(outputFilePath, outputJSON);
+console.log(`${count} translation keys parsed and written to '${outputFilePath}'`);