Show a more tailored message when adding empty files

Summary: Fixes T6695. Tailor this message.

Test Plan: {F333305}

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T6695

Differential Revision: https://secure.phabricator.com/D12022

resources/celerity/map.php

@@ -10,8 +10,8 @@ return array(
     'core.pkg.css' => '70320e8a',
     'core.pkg.js' => '5a1c336d',
     'darkconsole.pkg.js' => '8ab24e01',
-    'differential.pkg.css' => '5f5d3a4c',
-    'differential.pkg.js' => '6b52883b',
+    'differential.pkg.css' => '1940be3f',
+    'differential.pkg.js' => '2b14c4a1',
     'diffusion.pkg.css' => '591664fa',
     'diffusion.pkg.js' => 'bfc0737b',
     'maniphest.pkg.css' => '68d4dd3d',
@@ -55,7 +55,7 @@ return array(
     'rsrc/css/application/dashboard/dashboard.css' => '17937d22',
     'rsrc/css/application/diff/inline-comment-summary.css' => 'eb5f8e8c',
     'rsrc/css/application/differential/add-comment.css' => 'c478bcaa',
-    'rsrc/css/application/differential/changeset-view.css' => 'f9011399',
+    'rsrc/css/application/differential/changeset-view.css' => '6a8b172a',
     'rsrc/css/application/differential/core.css' => '7ac3cabc',
     'rsrc/css/application/differential/results-table.css' => '181aa9d9',
     'rsrc/css/application/differential/revision-comment.css' => '48186045',
@@ -360,14 +360,14 @@ return array(
     'rsrc/js/application/dashboard/behavior-dashboard-move-panels.js' => '82439934',
     'rsrc/js/application/dashboard/behavior-dashboard-query-panel-select.js' => '453c5375',
     'rsrc/js/application/dashboard/behavior-dashboard-tab-panel.js' => 'd4eecc63',
-    'rsrc/js/application/differential/ChangesetViewManager.js' => 'fce415a0',
-    'rsrc/js/application/differential/DifferentialInlineCommentEditor.js' => '41060c54',
+    'rsrc/js/application/differential/ChangesetViewManager.js' => 'a9af1212',
+    'rsrc/js/application/differential/DifferentialInlineCommentEditor.js' => 'd3aa4b40',
     'rsrc/js/application/differential/behavior-add-reviewers-and-ccs.js' => 'e10f8e18',
     'rsrc/js/application/differential/behavior-comment-jump.js' => '4fdb476d',
     'rsrc/js/application/differential/behavior-comment-preview.js' => '6932def3',
     'rsrc/js/application/differential/behavior-diff-radios.js' => 'e1ff79b1',
     'rsrc/js/application/differential/behavior-dropdown-menus.js' => '2035b9cb',
-    'rsrc/js/application/differential/behavior-edit-inline-comments.js' => '1360cac8',
+    'rsrc/js/application/differential/behavior-edit-inline-comments.js' => '7378d48a',
     'rsrc/js/application/differential/behavior-keyboard-nav.js' => '2c426492',
     'rsrc/js/application/differential/behavior-populate.js' => '8694b1df',
     'rsrc/js/application/differential/behavior-show-field-details.js' => 'bba9eedf',
@@ -509,7 +509,7 @@ return array(
     'aphront-two-column-view-css' => '16ab3ad2',
     'aphront-typeahead-control-css' => '0e403212',
     'auth-css' => '1e655982',
-    'changeset-view-manager' => 'fce415a0',
+    'changeset-view-manager' => 'a9af1212',
     'config-options-css' => '7fedf08b',
     'config-welcome-css' => '6abd79be',
     'conpherence-durable-column-view' => '1ef6ae75',
@@ -518,9 +518,9 @@ return array(
     'conpherence-notification-css' => '04a6e10a',
     'conpherence-update-css' => '1099a660',
     'conpherence-widget-pane-css' => '3d575438',
-    'differential-changeset-view-css' => 'f9011399',
+    'differential-changeset-view-css' => '6a8b172a',
     'differential-core-view-css' => '7ac3cabc',
-    'differential-inline-comment-editor' => '41060c54',
+    'differential-inline-comment-editor' => 'd3aa4b40',
     'differential-results-table-css' => '181aa9d9',
     'differential-revision-add-comment-css' => 'c478bcaa',
     'differential-revision-comment-css' => '48186045',
@@ -569,7 +569,7 @@ return array(
     'javelin-behavior-differential-comment-jump' => '4fdb476d',
     'javelin-behavior-differential-diff-radios' => 'e1ff79b1',
     'javelin-behavior-differential-dropdown-menus' => '2035b9cb',
-    'javelin-behavior-differential-edit-inline-comments' => '1360cac8',
+    'javelin-behavior-differential-edit-inline-comments' => '7378d48a',
     'javelin-behavior-differential-feedback-preview' => '6932def3',
     'javelin-behavior-differential-keyboard-navigation' => '2c426492',
     'javelin-behavior-differential-populate' => '8694b1df',
@@ -889,14 +889,6 @@ return array(
       'javelin-install',
       'javelin-util',
     ),
-    '1360cac8' => array(
-      'javelin-behavior',
-      'javelin-stratcom',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-vector',
-      'differential-inline-comment-editor',
-    ),
     '13c739ea' => array(
       'javelin-behavior',
       'javelin-stratcom',
@@ -1079,14 +1071,6 @@ return array(
       'phuix-action-list-view',
       'phuix-action-view',
     ),
-    '41060c54' => array(
-      'javelin-dom',
-      'javelin-util',
-      'javelin-stratcom',
-      'javelin-install',
-      'javelin-request',
-      'javelin-workflow',
-    ),
     42126667 => array(
       'javelin-behavior',
       'javelin-dom',
@@ -1332,6 +1316,14 @@ return array(
       'javelin-behavior',
       'javelin-dom',
     ),
+    '7378d48a' => array(
+      'javelin-behavior',
+      'javelin-stratcom',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-vector',
+      'differential-inline-comment-editor',
+    ),
     '73d09eef' => array(
       'javelin-behavior',
       'javelin-vector',
@@ -1637,6 +1629,16 @@ return array(
       'javelin-uri',
       'phabricator-keyboard-shortcut',
     ),
+    'a9af1212' => array(
+      'javelin-dom',
+      'javelin-util',
+      'javelin-stratcom',
+      'javelin-install',
+      'javelin-workflow',
+      'javelin-router',
+      'javelin-behavior-device',
+      'javelin-vector',
+    ),
     'a9f88de2' => array(
       'javelin-behavior',
       'javelin-dom',
@@ -1762,6 +1764,14 @@ return array(
       'javelin-quicksand',
       'phabricator-keyboard-shortcut',
     ),
+    'd3aa4b40' => array(
+      'javelin-dom',
+      'javelin-util',
+      'javelin-stratcom',
+      'javelin-install',
+      'javelin-request',
+      'javelin-workflow',
+    ),
     'd4a14807' => array(
       'javelin-install',
       'javelin-dom',
@@ -1971,16 +1981,6 @@ return array(
       'javelin-dom',
       'phortune-credit-card-form',
     ),
-    'fce415a0' => array(
-      'javelin-dom',
-      'javelin-util',
-      'javelin-stratcom',
-      'javelin-install',
-      'javelin-workflow',
-      'javelin-router',
-      'javelin-behavior-device',
-      'javelin-vector',
-    ),
     'fe287620' => array(
       'javelin-install',
       'javelin-dom',

src/applications/differential/__tests__/data/empty.diff

@@ -0,0 +1,3 @@
+diff --git a/empty b/empty
+new file mode 100644
+index 0000000..e69de29

src/applications/differential/__tests__/data/empty.diff.one.expect

@@ -0,0 +1,5 @@
+CTYPE 1 1 (unforced)
+empty
+empty
+-
+SHIELD (none) This is an empty file.

src/applications/differential/__tests__/data/empty.diff.two.expect

@@ -0,0 +1,5 @@
+CTYPE 1 1 (unforced)
+empty
+empty
+-
+SHIELD (none) This is an empty file.

src/applications/differential/parser/DifferentialChangesetParser.php

@@ -850,9 +850,19 @@ final class DifferentialChangesetParser {
           // we'll never have it so we need to be prepared to not render a link.
           $type = 'none';
         }
-        $shield = $renderer->renderShield(
-          pht('The contents of this file were not changed.'),
-          $type);
+
+        $type_add = DifferentialChangeType::TYPE_ADD;
+        if ($this->changeset->getChangeType() == $type_add) {
+          // Although the generic message is sort of accurate in a technical
+          // sense, this more-tailored message is less confusing.
+          $shield = $renderer->renderShield(
+            pht('This is an empty file.'),
+            $type);
+        } else {
+          $shield = $renderer->renderShield(
+            pht('The contents of this file were not changed.'),
+            $type);
+        }
       } else if ($this->isWhitespaceOnly()) {
         $shield = $renderer->renderShield(
           pht('This file was changed only by adding or removing whitespace.'),