Handle extracted comments

lib/po.js

@@ -120,9 +120,13 @@ PO.parse = function (data) {
                 item.flags[flags[i]] = true;
             }
         }
-        else if (line.match(/^#/)) { // Comment
+        else if (line.match(/^#\s+/)) { // Translator comment
             finish();
-            item.comments.push(trim(line.replace(/^#/, '')));
+            item.comments.push(trim(line.replace(/^#\s+/, '')));
+        }
+        else if (line.match(/^#\./)) { // Extracted comment
+            finish();
+            item.extractedComments.push(trim(line.replace(/^#\./, '')));
         }
         else if (line.match(/^msgid_plural/)) { // Plural form
             item.msgid_plural = extract(line);
@@ -168,7 +172,8 @@ PO.Item = function () {
     this.references = [];
     this.msgid_plural = null;
     this.msgstr = [];
-    this.comments = [];
+    this.comments = []; // translator comments
+    this.extractedComments = [];
     this.flags = {};
 };
 
@@ -192,12 +197,21 @@ PO.Item.prototype.toString = function () {
         return lines;
     };
 
+    // https://www.gnu.org/software/gettext/manual/html_node/PO-Files.html
+    // says order is translator-comments, extracted-comments, references, flags
+
     if (this.comments.length > 0) {
         this.comments.forEach(function (c) {
             lines.push('# ' + c);
         });
     }
 
+    if (this.extractedComments.length > 0) {
+        this.extractedComments.forEach(function (c) {
+            lines.push('#. ' + c);
+        });
+    }
+
     if (this.references.length > 0) {
         this.references.forEach(function (ref) {
             lines.push('#: ' + ref);