save-as-template button in editor

+ keep i18n attributes and use them as CSS selectors
+ reduce flicker when creating a new style

_locales/en/messages.json

@@ -1352,6 +1352,9 @@
   "retrieveDropboxSync": {
     "message": "Dropbox Import"
   },
+  "saveAsTemplate": {
+    "message": "Save as template"
+  },
   "search": {
     "message": "Search",
     "description": "Label before the search input field in the editor shown on Ctrl-F"
@@ -1812,10 +1815,6 @@
   "usercssReplaceTemplateConfirmation": {
     "message": "Replace the default template for new Usercss styles with the current code?"
   },
-  "usercssReplaceTemplateName": {
-    "message": "Empty @name replaces the default template",
-    "description": "The text shown after @name when creating a new Usercss style"
-  },
   "usercssReplaceTemplateSectionBody": {
     "message": "Insert code here...",
     "description": "The code placeholder comment in a new style created by clicking 'Write style' in the popup"

edit.html

@@ -392,6 +392,9 @@
                 </a>
               </div>
             </div>
+            <div class="options-column usercss-only">
+              <button i18n-text="saveAsTemplate"></button>
+            </div>
           </div>
         </details>
         <details id="publish" data-pref="editor.publish.expanded" class="ignore-pref-if-compact">

edit/edit.css

@@ -977,7 +977,7 @@ body.linter-disabled .hidden-unless-compact {
   margin-top: 0;
 }
 
-#options-wrapper .options-column:nth-child(2) {
+#options-wrapper .options-column:nth-child(n + 2) {
   margin-top: .75rem;
 }
 
@@ -1126,7 +1126,7 @@ body.linter-disabled .hidden-unless-compact {
   .options-column > .usercss-only {
     margin-bottom: 0;
   }
-  #options-wrapper .options-column:nth-child(2) {
+  #options-wrapper .options-column:nth-child(n + 2) {
     margin-top: 0;
   }
   #options:not([open]),

edit/edit.js

@@ -4,6 +4,7 @@
 /* global SectionsEditor */
 /* global SourceEditor */
 /* global baseInit */
+/* global chromeSync */// storage-util.js
 /* global clipString createHotkeyInput helpPopup */// util.js
 /* global closeCurrentTab deepEqual sessionStore tryJSONparse */// toolbox.js
 /* global cmFactory */
@@ -16,7 +17,10 @@
 //#region init
 
 baseInit.ready.then(async () => {
-  await waitForSheet();
+  [editor.template] = await Promise.all([
+    editor.isUsercss && !editor.style.id && chromeSync.getLZValue(chromeSync.LZ_KEY.usercssTemplate),
+    waitForSheet(),
+  ]);
   (editor.isUsercss ? SourceEditor : SectionsEditor)();
   await editor.ready;
   editor.ready = true;

edit/source-editor.js

@@ -17,20 +17,19 @@
 function SourceEditor() {
   const {style, /** @type DirtyReporter */dirty} = editor;
   let savedGeneration;
-  let placeholderName = '';
   let prevMode = NaN;
 
   $$remove('.sectioned-only');
   $('#header').on('wheel', headerOnScroll);
   $('#sections').textContent = '';
   $('#sections').appendChild($create('.single-editor'));
-
+  $('[i18n-text="saveAsTemplate"]').onclick = saveTemplate;
-  if (!style.id) setupNewStyle(style);
 
   const cm = cmFactory.create($('.single-editor'));
   const sectionFinder = MozSectionFinder(cm);
   const sectionWidget = MozSectionWidget(cm, sectionFinder);
   editor.livePreview.init(preprocess);
+  if (!style.id) setupNewStyle();
   createMetaCompiler(meta => {
     style.usercssData = meta;
     style.name = meta.name;
@@ -75,13 +74,7 @@ function SourceEditor() {
         }
         showLog(res);
       } catch (err) {
-        const i = err.index;
+        showSaveError(err);
-        const isNameEmpty = i > 0 &&
-          err.code === 'missingValue' &&
-          sourceCode.slice(sourceCode.lastIndexOf('\n', i - 1), i).trim().endsWith('@name');
-        return isNameEmpty
-          ? saveTemplate(sourceCode)
-          : showSaveError(err);
       }
     },
     scrollToEditor: () => {},
@@ -160,7 +153,7 @@ function SourceEditor() {
     return name;
   }
 
-  async function setupNewStyle(style) {
+  function setupNewStyle() {
     style.sections[0].code = ' '.repeat(prefs.get('editor.tabSize')) +
       `/* ${t('usercssReplaceTemplateSectionBody')} */`;
     let section = MozDocMapper.styleToCss(style);
@@ -177,17 +170,11 @@ function SourceEditor() {
       @author         Me
       ==/UserStyle== */
     `.replace(/^\s+/gm, '');
-
+    style.name = [style.name, new Date().toLocaleString()].filter(Boolean).join(' - ');
-    dirty.clear('sourceGeneration');
-    style.sourceCode = '';
-
-    placeholderName = `${style.name || t('usercssReplaceTemplateName')} - ${new Date().toLocaleString()}`;
-    let code = await chromeSync.getLZValue(chromeSync.LZ_KEY.usercssTemplate);
-    code = code || DEFAULT_CODE;
-    code = code.replace(/@name(\s*)(?=[\r\n])/, (str, space) =>
-      `${str}${space ? '' : ' '}${placeholderName}`);
     // strip the last dummy section if any, add an empty line followed by the section
-    style.sourceCode = code.replace(/\s*@-moz-document[^{]*{[^}]*}\s*$|\s+$/g, '') + '\n\n' + section;
+    style.sourceCode = (editor.template || DEFAULT_CODE)
+      .replace(/(@name)(?:([\t\x20]+).*|\n)/, (_, k, space) => `${k}${space || ' '}${style.name}`)
+      .replace(/\s*@-moz-document[^{]*{[^}]*}\s*$|\s+$/g, '') + '\n\n' + section;
     cm.startOperation();
     cm.setValue(style.sourceCode);
     cm.clearHistory();
@@ -199,9 +186,7 @@ function SourceEditor() {
 
   function updateMeta() {
     const name = style.customName || style.name;
-    if (name !== placeholderName) {
+    $('#name').value = name;
-      $('#name').value = name;
-    }
     $('#enabled').checked = style.enabled;
     $('#url').href = style.url;
     editor.updateName();
@@ -236,9 +221,10 @@ function SourceEditor() {
     }
   }
 
-  async function saveTemplate(code) {
+  async function saveTemplate() {
     if (await messageBoxProxy.confirm(t('usercssReplaceTemplateConfirmation'))) {
       const key = chromeSync.LZ_KEY.usercssTemplate;
+      const code = cm.getValue();
       await chromeSync.setLZValue(key, code);
       if (await chromeSync.getLZValue(key) !== code) {
         messageBoxProxy.alert(t('syncStorageErrorSaving'));

js/localization.js

@@ -73,7 +73,6 @@ Object.assign(t, {
         if (toInsert) {
           node.insertBefore(toInsert, before || null);
         }
-        node.removeAttribute(name);
       }
     }
   },