Port fast-forward MR widget states from EE

See https://gitlab.com/gitlab-org/gitlab-ce/issues/20076

4 files changed, 41 insertions, 19 deletions

diff --git a/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_status_icon.js b/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_status_icon.js
index 703f3a56a34..3cbcbdd52c5 100644
--- a/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_status_icon.js
+++ b/app/assets/javascripts/vue_merge_request_widget/components/mr_widget_status_icon.js
@@ -26,6 +26,7 @@ export default {
       <ci-icon v-else :status="statusObj" />
       <button
         v-if="showDisabledButton"
+        ref="mergeButton"
         type="button"
         class="btn btn-success btn-sm"
         disabled="true">
diff --git a/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.js b/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.js
index f9cb79a0bc1..f2245a532f4 100644
--- a/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.js
+++ b/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_conflicts.js
@@ -10,27 +10,40 @@ export default {
   },
   template: `
     <div class="mr-widget-body media">
-      <status-icon status="failed" showDisabledButton />
+      <status-icon
+        ref="statusIcon"
+        status="failed"
+        showDisabledButton />
       <div class="media-body space-children">
-        <span class="bold">
-          There are merge conflicts<span v-if="!mr.canMerge">.</span>
-          <span v-if="!mr.canMerge">
-            Resolve these conflicts or ask someone with write access to this repository to merge it locally
+        <template v-if="mr.ffOnlyEnabled">
+          <span class="bold">
+            Fast-forward merge is not possible.
+            To merge this request, first rebase locally
           </span>
-        </span>
-        <a
-          v-if="mr.canMerge && mr.conflictResolutionPath"
-          :href="mr.conflictResolutionPath"
-          class="btn btn-default btn-xs js-resolve-conflicts-button">
-          Resolve conflicts
-        </a>
-        <a
-          v-if="mr.canMerge"
-          class="btn btn-default btn-xs js-merge-locally-button"
-          data-toggle="modal"
-          href="#modal_merge_info">
-          Merge locally
-        </a>
+        </template>
+        <template v-else>
+          <span class="bold">
+            There are merge conflicts<span v-if="!mr.canMerge">.</span>
+            <span v-if="!mr.canMerge">
+              Resolve these conflicts or ask someone with write access to this repository to merge it locally
+            </span>
+          </span>
+          <a
+            v-if="mr.canMerge && mr.conflictResolutionPath"
+            ref="resolveConflictsButton"
+            :href="mr.conflictResolutionPath"
+            class="btn btn-default btn-xs">
+            Resolve conflicts
+          </a>
+          <a
+            v-if="mr.canMerge"
+            ref="mergeLocallyButton"
+            class="btn btn-default btn-xs"
+            data-toggle="modal"
+            href="#modal_merge_info">
+            Merge locally
+          </a>
+        </template>
       </div>
     </div>
   `,
diff --git a/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_ready_to_merge.js b/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_ready_to_merge.js
index ad709da51ee..e1c37add496 100644
--- a/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_ready_to_merge.js
+++ b/app/assets/javascripts/vue_merge_request_widget/components/states/mr_widget_ready_to_merge.js
@@ -284,7 +284,14 @@ export default {
                 :mr="mr"
                 :is-merge-button-disabled="isMergeButtonDisabled" />
 
+              <span
+                v-if="mr.ffOnlyEnabled"
+                ref="fastForwardMessage">
+                Fast-forward merge without a merge commit
+              </span>
               <button
+                v-else
+                ref="modifyCommitMessageButton"
                 @click="toggleCommitMessageEditor"
                 :disabled="isMergeButtonDisabled"
                 class="btn btn-default btn-xs"
diff --git a/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js b/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js
index 29464662578..03969e33e97 100644
--- a/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js
+++ b/app/assets/javascripts/vue_merge_request_widget/stores/mr_widget_store.js
@@ -57,6 +57,7 @@ export default class MergeRequestStore {
     this.onlyAllowMergeIfPipelineSucceeds = data.only_allow_merge_if_pipeline_succeeds || false;
     this.mergeWhenPipelineSucceeds = data.merge_when_pipeline_succeeds || false;
     this.mergePath = data.merge_path;
+    this.ffOnlyEnabled = data.ff_only_enabled;
     this.statusPath = data.status_path;
     this.emailPatchesPath = data.email_patches_path;
     this.plainDiffPath = data.plain_diff_path;