Add support for metadata in file headers

Solves #10.

readme.md

@@ -61,6 +61,10 @@ wpPot({
   Description: Name and email address of the last translator (ex: `John Doe <me@example.com>`)  
   Type: `string`  
   Default: undefined
+- `metadataFile`  
+  Description: Path to file containing plugin/theme metadata header relative to `relativeTo`  
+  Type: `string`  
+  Default: undefined
 - `package`  
   Description: Package name  
   Type: `string`  

test/6-file-headers-test.js

@@ -0,0 +1,37 @@
+/* eslint-env node, mocha */
+/* global before, after, describe, it */
+'use strict';
+
+const assert = require('assert');
+const wpPot = require('../');
+const testHelper = require('./test-helper');
+
+describe('File Headers tests', () => {
+  it('Can read theme headers', () => {
+    const fixturePath = 'test/fixtures/theme-headers.php';
+
+    const potContents = wpPot({
+      src: fixturePath,
+      writeFile: false,
+      metadataFile: fixturePath
+    });
+
+    assert(testHelper.verifyLanguageBlock(potContents, false, fixturePath + ':2', 'Test Theme', false, false));
+    assert(testHelper.verifyLanguageBlock(potContents, false, fixturePath + ':3', 'Rasmus Bengtsson', false, false));
+    assert(testHelper.verifyLanguageBlock(potContents, false, fixturePath + ':4', '1.0.0', false, false));
+  });
+
+  it('Can read plugin headers', () => {
+    const fixturePath = 'test/fixtures/plugin-headers.php';
+
+    const potContents = wpPot({
+      src: fixturePath,
+      writeFile: false,
+      metadataFile: fixturePath
+    });
+
+    assert(testHelper.verifyLanguageBlock(potContents, false, fixturePath + ':2', 'Test Plugin', false, false));
+    assert(testHelper.verifyLanguageBlock(potContents, false, fixturePath + ':3', 'Rasmus Bengtsson', false, false));
+    assert(testHelper.verifyLanguageBlock(potContents, false, fixturePath + ':4', '1.0.0', false, false));
+  });
+});

test/fixtures/plugin-headers.php

@@ -0,0 +1,6 @@
+<?php
+/*
+ * Plugin Name: Test Plugin
+ * Author: Rasmus Bengtsson
+ * Version: 1.0.0
+ */

test/fixtures/theme-headers.php

@@ -0,0 +1,6 @@
+<?php
+/*
+ * Theme Name: Test Theme
+ * Author: Rasmus Bengtsson
+ * Version: 1.0.0
+ */

translation-parser.js

@@ -18,6 +18,41 @@ class TranslationParser {
     this.translations = [];
   }
 
+  /**
+   * Parse theme or plugin meta data from file header
+   *
+   * @param {string} filecontent
+   * @param {string} filename
+   */
+  parseFileHeader (filecontent, filename) {
+    const _this = this;
+    const lines = filecontent.match(/[^\r\n]+/g);
+    lines.splice(30);
+
+    const headers = [ 'Plugin Name', 'Theme Name', 'Version', 'Author' ];
+
+    lines.forEach(function (lineContent, line) {
+      headers.forEach(function (header, index) {
+        const regex = new RegExp('^(?:[ \t]*<?php)?[ \t/*#@]*' + header + ':(.*)$', 'i');
+        const match = regex.exec(lineContent);
+
+        if (match) {
+          headers.splice(index, 1);
+          const headerValue = match[ 1 ].replace(/\s*(?:\*\/|\?>).*/, '').trim();
+
+          const translationCall = {
+            args: [ headerValue ],
+            filename,
+            line,
+            method: ''
+          };
+
+          _this.addTranslation(translationCall);
+        }
+      });
+    });
+  }
+
   /**
    * Parse comment AST
    *
@@ -277,12 +312,16 @@ class TranslationParser {
 
     this.translations = existingTranslations;
 
+    const filename = path.relative(this.options.relativeTo || path.dirname(this.options.destFile || __filename), filePath).replace(/\\/g, '/');
+
+    if (this.options.metadataFile === filename) {
+      this.parseFileHeader(filecontent, filename);
+    }
+
     // Skip file if no translation functions is found
     const validFunctionsInFile = new RegExp(this.options.functionCalls.valid.join('|').replace('$', '\\$'));
 
     if (validFunctionsInFile.test(filecontent)) {
-      const filename = path.relative(this.options.relativeTo || path.dirname(this.options.destFile || __filename), filePath).replace(/\\/g, '/');
-
       try {
         const ast = parser.parseCode(filecontent, filename);
         this.parseCodeTree(ast, filename);