Fix message extraction to handle multiline gettexts

prettier will often break those

tools/extract-messages.js

@@ -28,8 +28,8 @@ const compiler = require('vue-template-compiler');
 const NODETYPE_TEXT = 3;
 
 const template_regex = /(<template>[\s\S]*<\/template>)/;
-const gettext_template1 = /\$gettext\('((?:[^']|\\')*?)'\)/g;
-const gettext_template2 = /\$gettext\('((?:[^']|\\')*?)', *'([^']*?)'\)/g;
+const gettext_template1 = /\$gettext\(\s*'((?:[^']|\\')*?)'\s*\)/gm;
+const gettext_template2 = /\$gettext\(\s*'((?:[^']|\\')*?)'\s*,\s*'([^']*?)'\s*\)/gm;
 
 /**************************************************************************
   a "Result" is a .pot item (msgctxt/msgid), with every associated meta-data
@@ -75,7 +75,7 @@ Process.prototype.push = function (file, line, msgctxt, msgid) {
     this.data[key] = new Result(msgctxt, msgid);
   }
 
-  const position = this.includeLineNumberInPositions ? `${file}:${line}` : file;
+  const position = this.includeLineNumberInPositions ? `${file}:${line || '?'}` : file;
   this.data[key].addFile(position);
 };
 
@@ -93,15 +93,12 @@ Process.prototype.addScript = function (file, data) {
 Process.prototype.parseScript = function (file, data, regex) {
   let msgData;
 
-  const lines = data.split('\n');
+  while ((msgData = regex.exec(data)) !== null) {
+    const msgid = msgData[1];
+    const msgctxt = msgData[2];
+    const line = (data.slice(0, msgData.index).match(/\n/g) || []).lengh;
 
-  for (let i = 0; i < lines.length; i++) {
-    while ((msgData = regex.exec(lines[i])) !== null) {
-      const msgid = msgData[1];
-      const msgctxt = msgData[2];
-
-      this.push(file, i + 1, msgctxt, msgid.replace(/\\'/g, "'"));
-    }
+    this.push(file, line, msgctxt, msgid.replace(/\\'/g, "'"));
   }
 };
 
@@ -130,11 +127,11 @@ Process.prototype.parseTemplate = function (file, data) {
     let msgctxt;
 
     if (node.children.length !== 1) {
-      throw new Error(`In ${position}\nNodes with v-translate directive must contains only one child`);
+      throw new Error(`In ${line}\nNodes with v-translate directive must contains only one child`);
     }
 
     if (node.children[0].type !== NODETYPE_TEXT) {
-      throw new Error(`In ${position}\nInterploation is not yet supported. Please use $gettext`);
+      throw new Error(`In ${line}\nInterploation is not yet supported. Please use $gettext`);
     }
 
     for (const attribute of node.attrsList) {