Refactor build-locales a bit

This makes a couple of procedure-specific parts into methods in `locale-compare`, so that they can be tested more readily.

bin/lib/locale-compare.js

@@ -3,6 +3,9 @@
 // -----------------------------------------------------------------------------
 
 var crypto = require('crypto');
+var fs = require('fs');
+var path = require('path');
+var po2icu = require('po2icu');
 
 var Helpers = {};
 
@@ -62,4 +65,75 @@ Helpers.getMD5Map = function (ICUIdMap) {
     return md5Map;
 };
 
+/**
+ * Grabs the translated strings from the po files for the given language and strings
+ * @param  {str}    lang       iso code of the language to use
+ * @param  {object} idsWithICU key: '<viewName>-<react-intl string id>'.
+ *                             value: english strings for translation
+ * @param  {object} md5WithIds key: md5 hash of the english strings for translation.
+ *                             value: '<viewName>-<react-intl string id>'
+ * @return {object}            translations – sub-objects by view containing:
+ *                                          key: '<react-intl string id>'
+ *                                          value: translated version of string
+ */
+Helpers.getTranslationsForLanguage = function (lang, idsWithICU, md5WithIds) {
+    var poUiDir = path.resolve(__dirname, '../../node_modules/scratchr2_translations/ui');
+    var jsFile = path.resolve(poUiDir, lang + '/LC_MESSAGES/djangojs.po');
+    var pyFile = path.resolve(poUiDir, lang + '/LC_MESSAGES/django.po');
+
+    var translations = {};
+    try {
+        fs.accessSync(jsFile, fs.R_OK);
+        var jsTranslations = po2icu.poFileToICUSync(lang, jsFile);
+        translations = Helpers.mergeNewTranslations(translations, jsTranslations, idsWithICU, md5WithIds);
+    } catch (err) {
+        if (err.code !== 'ENOENT') {
+            throw err;
+        }
+    }
+
+    try {
+        fs.accessSync(pyFile, fs.R_OK);
+        var pyTranslations = po2icu.poFileToICUSync(lang, pyFile);
+        translations = Helpers.mergeNewTranslations(translations, pyTranslations, idsWithICU, md5WithIds);
+    } catch (err) {
+        if (err.code !== 'ENOENT') {
+            throw err;
+        }
+    }
+    
+    var translationsByView = {};
+    for (var id in translations) {
+        var ids = id.split('-'); // [viewName, stringId]
+        var viewName = ids[0];
+        var stringId = ids[1];
+
+        if (!translationsByView.hasOwnProperty(viewName)) {
+            translationsByView[viewName] = {};
+        }
+        if (!translationsByView[viewName].hasOwnProperty(lang)) {
+            translationsByView[viewName][lang] = {};
+        }
+        translationsByView[viewName][lang][stringId] = translations[id];
+    }
+    return translationsByView;
+};
+
+Helpers.writeTranslationsToJS = function (outputDir, viewName, translationObject) {
+    var objectString = JSON.stringify(translationObject);
+    var fileString = 'window._messages = ' + objectString + ';';
+    fs.writeFileSync(outputDir + '/' + viewName + '.intl.js', fileString);
+};
+
+Helpers.getIdsForView = function (viewName, viewFile, localeObject, idsWithICU, icuWithIds) {
+    var ids = JSON.parse(fs.readFileSync(viewFile, 'utf8'));
+    localeObject[viewName] = {
+        en: ids
+    };
+    for (var id in ids) {
+        idsWithICU[viewName + '-' + id] = ids[id];
+        icuWithIds[ids[id]] = viewName + '-' + id; // add viewName to identifier for later
+    }
+};
+
 module.exports = Helpers;