langParser.js: Generate language list dynamically

This adds ``langParser.js`` to generate the available
language list automatically from available translation
files. This also adds a npm script for generating before
webpack bundles. Modifies .gitignore so that generated
``languages.js`` file is ignored.

Closes: coala#125

.gitignore

@@ -3,3 +3,4 @@ out
 yarn.lock
 .DS_Store
 **.orig
+src/js/languages.js

lib/langParser.js

@@ -0,0 +1,20 @@
+const fs = require('fs')
+const iso639 = require('iso-639-1')
+
+fs.readdir(`${__dirname}/../static/i18n`, function(err, items) {
+  var avaliableLanguages = {
+    Languages: {},
+  }
+  for (var i = 0; i < items.length; i++) {
+    var langName = items[i].substring(0, items[i].indexOf('.'))
+    var normalizedName = langName.split('-')[0]
+    var nativeName = iso639.getNativeName(normalizedName)
+    avaliableLanguages['Languages'][nativeName] = langName
+  }
+  fs.writeFileSync(
+    `${__dirname}/../src/js/languages.js`,
+    'export default ' +
+      JSON.stringify(avaliableLanguages) +
+      ' // eslint-disable-line'
+  )
+})

package.json

@@ -9,10 +9,11 @@
     "generate": "node ./lib/generate.js",
     "gather": "node ./lib/gather.js",
     "main": "node ./lib/main.js",
+    "languages": "node ./lib/langParser.js",
     "clean": "rm -rf out/*",
     "dev": "webpack-dev-server --progress",
     "bundle": "NODE_ENV=production webpack --progress",
-    "build": "npm run bundle && npm run gather && npm run scrape && npm run planet && npm run main && npm run generate",
+    "build": "npm run languages && npm run bundle && npm run gather && npm run scrape && npm run planet && npm run main && npm run generate",
     "build:clean": "npm run clean && npm run build",
     "test": "jest"
   },
@@ -27,6 +28,7 @@
     "find-rss": "^1.6.4",
     "glob": "^7.1.2",
     "graphql-client": "^2.0.0",
+    "iso-639-1": "^2.0.3",
     "jquery": "^3.2.1",
     "jquery.i18n": "git+https://github.com/wikimedia/jquery.i18n.git",
     "json2yaml": "^1.1.0",

src/js/locale.js

@@ -1,4 +1,5 @@
 import init from './app'
+import Languages from './languages'
 
 var browserLocale
 
@@ -26,12 +27,7 @@ function updateTranslation(localex) {
 }
 
 $(window).on('load', function() {
-  var localeOptions = {
-    English: 'en',
-    Español: 'es',
-    Polski: 'pl',
-    'Norwegian Bokmål': 'nb_NO',
-  }
+  var localeOptions = Languages['Languages']
 
   var locList = $('#lang-select')
   $.each(localeOptions, function(key, value) {