Merge branch 'less-intrusive-system-note' into 'master'

Less intrusive system note

## What does this MR do?
This MR is for making system notes less intrusive by implementing proposed design
 
## Are there points in the code the reviewer needs to double check?
System notes are reusing in issues, commits and MR discussions. May need to double check to make sure that the design is not breaking anywhere

## Why was this MR needed?
This merge request solve issue #19797 

## Screenshots (if relevant)
**Before:**
![merge-request-before](/uploads/91953598087a613078d80333a43815a7/merge-request-before.png)
**After**
![2016-11-15_17.41.46](/uploads/c809ba53cc34ee83bb439ed741dc39f3/2016-11-15_17.41.46.gif)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
#19797, #23129

See merge request !6755

2 files changed, 50 insertions, 12 deletions

diff --git a/app/assets/javascripts/lib/utils/common_utils.js b/app/assets/javascripts/lib/utils/common_utils.js
index 2a38ac28172..d83c41fae9d 100644
--- a/app/assets/javascripts/lib/utils/common_utils.js
+++ b/app/assets/javascripts/lib/utils/common_utils.js
@@ -125,6 +125,11 @@
       // Close any open tooltips
       $('.has-tooltip, [data-toggle="tooltip"]').tooltip('destroy');
     };
+
+    gl.utils.isMetaKey = function(e) {
+      return e.metaKey || e.ctrlKey || e.altKey || e.shiftKey;
+    };
+
   })(window);
 
 }).call(this);
diff --git a/app/assets/javascripts/notes.js b/app/assets/javascripts/notes.js
index 44079bc3ca3..6cb87f9ba81 100644
--- a/app/assets/javascripts/notes.js
+++ b/app/assets/javascripts/notes.js
@@ -12,7 +12,7 @@
   var bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
 
   this.Notes = (function() {
-    var isMetaKey;
+    const MAX_VISIBLE_COMMIT_LIST_COUNT = 3;
 
     Notes.interval = null;
 
@@ -33,6 +33,7 @@
       this.resetMainTargetForm = bind(this.resetMainTargetForm, this);
       this.refresh = bind(this.refresh, this);
       this.keydownNoteText = bind(this.keydownNoteText, this);
+      this.toggleCommitList = bind(this.toggleCommitList, this);
       this.notes_url = notes_url;
       this.note_ids = note_ids;
       this.last_fetched_at = last_fetched_at;
@@ -46,6 +47,7 @@
       this.setPollingInterval();
       this.setupMainTargetNoteForm();
       this.initTaskList();
+      this.collapseLongCommitList();
     }
 
     Notes.prototype.addBinding = function() {
@@ -81,10 +83,13 @@
       $(document).on("click", ".js-add-diff-note-button", this.addDiffNote);
       // hide diff note form
       $(document).on("click", ".js-close-discussion-note-form", this.cancelDiscussionForm);
+      // toggle commit list
+      $(document).on("click", '.system-note-commit-list-toggler', this.toggleCommitList);
       // fetch notes when tab becomes visible
       $(document).on("visibilitychange", this.visibilityChange);
       // when issue status changes, we need to refresh data
       $(document).on("issuable:change", this.refresh);
+
       // when a key is clicked on the notes
       return $(document).on("keydown", ".js-note-text", this.keydownNoteText);
     };
@@ -114,9 +119,10 @@
 
     Notes.prototype.keydownNoteText = function(e) {
       var $textarea, discussionNoteForm, editNote, myLastNote, myLastNoteEditBtn, newText, originalText;
-      if (isMetaKey(e)) {
+      if (gl.utils.isMetaKey(e)) {
         return;
       }
+
       $textarea = $(e.target);
       // Edit previous note when UP arrow is hit
       switch (e.which) {
@@ -156,10 +162,6 @@
       }
     };
 
-    isMetaKey = function(e) {
-      return e.metaKey || e.ctrlKey || e.altKey || e.shiftKey;
-    };
-
     Notes.prototype.initRefresh = function() {
       clearInterval(Notes.interval);
       return Notes.interval = setInterval((function(_this) {
@@ -263,6 +265,7 @@
         $notesList.append(note.html).syntaxHighlight();
         // Update datetime format on the recent note
         gl.utils.localTimeAgo($notesList.find("#note_" + note.id + " .js-timeago"), false);
+        this.collapseLongCommitList();
         this.initTaskList();
         this.refresh();
         return this.updateNotesCount(1);
@@ -433,9 +436,9 @@
       var $form = $(xhr.target);
 
       if ($form.attr('data-resolve-all') != null) {
-        var projectPath = $form.data('project-path')
-            discussionId = $form.data('discussion-id'),
-            mergeRequestId = $form.data('noteable-iid');
+        var projectPath = $form.data('project-path');
+        var discussionId = $form.data('discussion-id');
+        var mergeRequestId = $form.data('noteable-iid');
 
         if (ResolveService != null) {
           ResolveService.toggleResolveForDiscussion(projectPath, mergeRequestId, discussionId);
@@ -844,9 +847,9 @@
       return this.notesCountBadge.text(parseInt(this.notesCountBadge.text()) + updateCount);
     };
 
-    Notes.prototype.resolveDiscussion = function () {
-      var $this = $(this),
-          discussionId = $this.attr('data-discussion-id');
+    Notes.prototype.resolveDiscussion = function() {
+      var $this = $(this);
+      var discussionId = $this.attr('data-discussion-id');
 
       $this
         .closest('form')
@@ -855,6 +858,36 @@
         .attr('data-project-path', $this.attr('data-project-path'));
     };
 
+    Notes.prototype.toggleCommitList = function(e) {
+      const $element = $(e.target);
+      const $closestSystemCommitList = $element.siblings('.system-note-commit-list');
+
+      $closestSystemCommitList.toggleClass('hide-shade');
+    };
+
+    /**
+    Scans system notes with `ul` elements in system note body
+    then collapse long commit list pushed by user to make it less
+    intrusive.
+     */
+    Notes.prototype.collapseLongCommitList = function() {
+      const systemNotes = $('#notes-list').find('li.system-note').has('ul');
+
+      $.each(systemNotes, function(index, systemNote) {
+        const $systemNote = $(systemNote);
+        const headerMessage = $systemNote.find('.note-text').find('p:first').text().replace(':', '');
+
+        $systemNote.find('.note-header .system-note-message').html(headerMessage);
+
+        if ($systemNote.find('li').length > MAX_VISIBLE_COMMIT_LIST_COUNT) {
+          $systemNote.find('.note-text').addClass('system-note-commit-list');
+          $systemNote.find('.system-note-commit-list-toggler').show();
+        } else {
+          $systemNote.find('.note-text').addClass('system-note-commit-list hide-shade');
+        }
+      });
+    };
+
     return Notes;
 
   })();