Add CLI option to enable alphabetical sorting of extracted keys

src/cli/extract.ts

@@ -16,6 +16,7 @@ const options = cli.parse({
 	output: ['o', 'Path you would like to save extracted strings to', 'dir', process.env.PWD],
 	format: ['f', 'Output format', ['json', 'pot'], 'json'],
 	replace: ['r', 'Replace the contents of output file if it exists (Merges by default)', 'boolean', false],
+	sort: ['s', 'Sort translations in the output file in alphabetical order', 'boolean', false],
 	clean: ['c', 'Remove obsolete strings when merging', 'boolean', false]
 });
 
@@ -77,6 +78,10 @@ try {
 		}
 	}
 
+	if (options.sort) {
+		collection = collection.sort();
+	}
+
 	fs.writeFileSync(outputPath, compiler.compile(collection));
 	cli.ok(`* Saved to '${outputPath}'`);
 } catch (e) {

src/utils/translation.collection.ts

@@ -75,4 +75,17 @@ export class TranslationCollection {
 		return Object.keys(this.values).length === 0;
 	}
 
+	public sort(compareFn?: (a: string, b: string) => number): TranslationCollection {
+		if (!compareFn) {
+			// if no compare functions is provided use a case insensitive sorting function
+			compareFn = (a, b) => a.toLowerCase().localeCompare(b.toLowerCase());
+		}
+
+		let collection = new TranslationCollection();
+		let sortedKeys = this.keys().sort(compareFn);
+		sortedKeys.forEach((key) => {
+			collection = collection.add(key, this.get(key));
+		});
+		return collection;
+	}
 }