Merge branch '22218-fix-note-form-footer' into 'master'

Fix note form hint showing slash commands supported for commits

## What are the relevant issue numbers?

Closes #22218

See merge request !6368

6 files changed, 126 insertions, 11 deletions

diff --git a/CHANGELOG b/CHANGELOG
index d7cdfe873cc..97e1c3b15c4 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -14,6 +14,7 @@ v 8.12.0 (unreleased)
   - Filter tags by name !6121
   - Update gitlab shell secret file also when it is empty. !3774 (glensc)
   - Give project selection dropdowns responsive width, make non-wrapping.
+  - Fix note form hint showing slash commands supported for commits.
   - Make push events have equal vertical spacing.
   - API: Ensure invitees are not returned in Members API.
   - Add two-factor recovery endpoint to internal API !5510
diff --git a/app/helpers/notes_helper.rb b/app/helpers/notes_helper.rb
index da230f76bae..b0331f36a2f 100644
--- a/app/helpers/notes_helper.rb
+++ b/app/helpers/notes_helper.rb
@@ -10,6 +10,10 @@ module NotesHelper
     Ability.can_edit_note?(current_user, note)
   end
 
+  def note_supports_slash_commands?(note)
+    Notes::SlashCommandsService.supported?(note, current_user)
+  end
+
   def noteable_json(noteable)
     {
       id: noteable.id,
diff --git a/app/services/notes/slash_commands_service.rb b/app/services/notes/slash_commands_service.rb
index 4a9a8a64653..2edbd39a9e7 100644
--- a/app/services/notes/slash_commands_service.rb
+++ b/app/services/notes/slash_commands_service.rb
@@ -5,9 +5,18 @@ module Notes
       'MergeRequest' => MergeRequests::UpdateService
     }
 
-    def supported?(note)
+    def self.noteable_update_service(note)
+      UPDATE_SERVICES[note.noteable_type]
+    end
+
+    def self.supported?(note, current_user)
       noteable_update_service(note) &&
-        can?(current_user, :"update_#{note.noteable_type.underscore}", note.noteable)
+        current_user &&
+        current_user.can?(:"update_#{note.noteable_type.underscore}", note.noteable)
+    end
+
+    def supported?(note)
+      self.class.supported?(note, current_user)
     end
 
     def extract_commands(note)
@@ -21,13 +30,7 @@ module Notes
       return if command_params.empty?
       return unless supported?(note)
 
-      noteable_update_service(note).new(project, current_user, command_params).execute(note.noteable)
-    end
-
-    private
-
-    def noteable_update_service(note)
-      UPDATE_SERVICES[note.noteable_type]
+      self.class.noteable_update_service(note).new(project, current_user, command_params).execute(note.noteable)
     end
   end
 end
diff --git a/app/views/projects/notes/_form.html.haml b/app/views/projects/notes/_form.html.haml
index 402f5b52f5e..46b402545cd 100644
--- a/app/views/projects/notes/_form.html.haml
+++ b/app/views/projects/notes/_form.html.haml
@@ -1,3 +1,5 @@
+- supports_slash_commands = note_supports_slash_commands?(@note)
+
 = form_for [@project.namespace.becomes(Namespace), @project, @note], remote: true, html: { :'data-type' => 'json', multipart: true, id: nil, class: "new-note js-new-note-form js-quick-submit common-note-form", "data-noteable-iid" => @note.noteable.try(:iid), }, authenticity_token: true do |f|
   = hidden_field_tag :view, diff_view
   = hidden_field_tag :line_type
@@ -14,8 +16,8 @@
       attr: :note,
       classes: 'note-textarea js-note-text',
       placeholder: "Write a comment or drag your files here...",
-      supports_slash_commands: true
-    = render 'projects/notes/hints', supports_slash_commands: true
+      supports_slash_commands: supports_slash_commands
+    = render 'projects/notes/hints', supports_slash_commands: supports_slash_commands
     .error-alert
 
   .note-form-actions.clearfix
diff --git a/spec/services/notes/slash_commands_service_spec.rb b/spec/services/notes/slash_commands_service_spec.rb
index 4f231aab161..d1099884a02 100644
--- a/spec/services/notes/slash_commands_service_spec.rb
+++ b/spec/services/notes/slash_commands_service_spec.rb
@@ -122,6 +122,75 @@ describe Notes::SlashCommandsService, services: true do
     end
   end
 
+  describe '.noteable_update_service' do
+    include_context 'note on noteable'
+
+    it 'returns Issues::UpdateService for a note on an issue' do
+      note = create(:note_on_issue, project: project)
+
+      expect(described_class.noteable_update_service(note)).to eq(Issues::UpdateService)
+    end
+
+    it 'returns Issues::UpdateService for a note on a merge request' do
+      note = create(:note_on_merge_request, project: project)
+
+      expect(described_class.noteable_update_service(note)).to eq(MergeRequests::UpdateService)
+    end
+
+    it 'returns nil for a note on a commit' do
+      note = create(:note_on_commit, project: project)
+
+      expect(described_class.noteable_update_service(note)).to be_nil
+    end
+  end
+
+  describe '.supported?' do
+    include_context 'note on noteable'
+
+    let(:note) { create(:note_on_issue, project: project) }
+
+    context 'with no current_user' do
+      it 'returns false' do
+        expect(described_class.supported?(note, nil)).to be_falsy
+      end
+    end
+
+    context 'when current_user cannot update the noteable' do
+      it 'returns false' do
+        user = create(:user)
+
+        expect(described_class.supported?(note, user)).to be_falsy
+      end
+    end
+
+    context 'when current_user can update the noteable' do
+      it 'returns true' do
+        expect(described_class.supported?(note, master)).to be_truthy
+      end
+
+      context 'with a note on a commit' do
+        let(:note) { create(:note_on_commit, project: project) }
+
+        it 'returns false' do
+          expect(described_class.supported?(note, nil)).to be_falsy
+        end
+      end
+    end
+  end
+
+  describe '#supported?' do
+    include_context 'note on noteable'
+
+    it 'delegates to the class method' do
+      service = described_class.new(project, master)
+      note = create(:note_on_issue, project: project)
+
+      expect(described_class).to receive(:supported?).with(note, master)
+
+      service.supported?(note)
+    end
+  end
+
   describe '#execute' do
     let(:service) { described_class.new(project, master) }
 
diff --git a/spec/views/projects/notes/_form.html.haml_spec.rb b/spec/views/projects/notes/_form.html.haml_spec.rb
new file mode 100644
index 00000000000..932d6756ad2
--- /dev/null
+++ b/spec/views/projects/notes/_form.html.haml_spec.rb
@@ -0,0 +1,36 @@
+require 'spec_helper'
+
+describe 'projects/notes/_form' do
+  include Devise::TestHelpers
+
+  let(:user) { create(:user) }
+  let(:project) { create(:empty_project) }
+
+  before do
+    project.team << [user, :master]
+    assign(:project, project)
+    assign(:note, note)
+
+    allow(view).to receive(:current_user).and_return(user)
+
+    render
+  end
+
+  %w[issue merge_request].each do |noteable|
+    context "with a note on #{noteable}" do
+      let(:note) { build(:"note_on_#{noteable}", project: project) }
+
+      it 'says that only markdown is supported, not slash commands' do
+        expect(rendered).to have_content('Styling with Markdown and slash commands are supported')
+      end
+    end
+  end
+
+  context 'with a note on a commit' do
+    let(:note) { build(:note_on_commit, project: project) }
+
+    it 'says that only markdown is supported, not slash commands' do
+      expect(rendered).to have_content('Styling with Markdown is supported')
+    end
+  end
+end