Show autosave message when autosave exists

editor/components/provider/index.js

@@ -26,7 +26,7 @@ class EditorProvider extends Component {
 		// Assume that we don't need to initialize in the case of an error recovery.
 		if ( ! props.recovery ) {
 			this.props.updateEditorSettings( props.settings );
-			this.props.setupEditor( props.post );
+			this.props.setupEditor( props.post, props.settings.autosave );
 		}
 	}
 

editor/store/actions.js

@@ -16,13 +16,15 @@ import {
  * Returns an action object used in signalling that editor has initialized with
  * the specified post object and editor settings.
  *
- * @param {Object} post     Post object.
+ * @param {Object}  post           Post object.
+ * @param {Object}  autosaveStatus The Post's autosave status.
  *
  * @return {Object} Action object.
  */
-export function setupEditor( post ) {
+export function setupEditor( post, autosaveStatus ) {
 	return {
 		type: 'SETUP_EDITOR',
+		autosave: autosaveStatus,
 		post,
 	};
 }

editor/store/effects.js

@@ -35,6 +35,7 @@ import {
 	replaceBlocks,
 	createSuccessNotice,
 	createErrorNotice,
+	createWarningNotice,
 	removeNotice,
 	saveSharedBlock,
 	insertBlock,
@@ -69,6 +70,7 @@ import {
  * Module Constants
  */
 const SAVE_POST_NOTICE_ID = 'SAVE_POST_NOTICE_ID';
+const AUTOSAVE_POST_NOTICE_ID = 'AUTOSAVE_POST_NOTICE_ID';
 const TRASH_POST_NOTICE_ID = 'TRASH_POST_NOTICE_ID';
 const SHARED_BLOCK_NOTICE_ID = 'SHARED_BLOCK_NOTICE_ID';
 
@@ -133,6 +135,7 @@ export default {
 			} );
 
 			dispatch( removeNotice( SAVE_POST_NOTICE_ID ) );
+			dispatch( removeNotice( AUTOSAVE_POST_NOTICE_ID ) );
 
 			request = wp.apiRequest( {
 				path: `/wp/v2/${ basePath }/${ post.id }`,
@@ -209,7 +212,7 @@ export default {
 		if ( noticeMessage ) {
 			dispatch( createSuccessNotice(
 				<p>
-					<span>{ noticeMessage }</span>
+					{ noticeMessage }
 					{ ' ' }
 					{ shouldShowLink && <a href={ post.link }>{ __( 'View post' ) }</a> }
 				</p>,
@@ -344,7 +347,7 @@ export default {
 		) );
 	},
 	SETUP_EDITOR( action, { getState } ) {
-		const { post } = action;
+		const { post, autosave } = action;
 		const state = getState();
 		const template = getTemplate( state );
 		const templateLock = getTemplateLock( state );
@@ -376,9 +379,27 @@ export default {
 			edits.status = 'draft';
 		}
 
+		// Check the auto-save status
+		let autosaveAction;
+		if ( autosave ) {
+			const noticeMessage = __( 'There is an autosave of this post that is more recent than the version below.' );
+			autosaveAction = createWarningNotice(
+				<p>
+					{ noticeMessage }
+					{ ' ' }
+					<a href={ autosave.editLink }>{ __( 'View the autosave' ) }</a>
+				</p>,
+				{
+					id: AUTOSAVE_POST_NOTICE_ID,
+					spokenMessage: noticeMessage,
+				}
+			);
+		}
+
 		return [
 			setTemplateValidity( isValidTemplate ),
 			setupEditorState( post, blocks, edits ),
+			...( autosaveAction ? [ autosaveAction ] : [] ),
 		];
 	},
 	SYNCHRONIZE_TEMPLATE( action, { getState } ) {

editor/store/test/actions.js

@@ -48,10 +48,12 @@ describe( 'actions', () => {
 	describe( 'setupEditor', () => {
 		it( 'should return the SETUP_EDITOR action', () => {
 			const post = {};
-			const result = setupEditor( post );
+			const autosave = {};
+			const result = setupEditor( post, autosave );
 			expect( result ).toEqual( {
 				type: 'SETUP_EDITOR',
 				post,
+				autosave,
 			} );
 		} );
 	} );

editor/store/test/effects.js

@@ -302,7 +302,7 @@ describe( 'effects', () => {
 			expect( dispatch ).toHaveBeenCalledTimes( 1 );
 			expect( dispatch ).toHaveBeenCalledWith( expect.objectContaining( {
 				notice: {
-					content: <p><span>Post published!</span> <a>View post</a></p>, // eslint-disable-line jsx-a11y/anchor-is-valid
+					content: <p>Post published!{ ' ' }<a>View post</a></p>, // eslint-disable-line jsx-a11y/anchor-is-valid
 					id: 'SAVE_POST_NOTICE_ID',
 					isDismissible: true,
 					status: 'success',
@@ -325,7 +325,7 @@ describe( 'effects', () => {
 			expect( dispatch ).toHaveBeenCalledWith( expect.objectContaining( {
 				notice: {
 					content: <p>
-						<span>Post reverted to draft.</span>
+						Post reverted to draft.
 						{ ' ' }
 						{ false }
 					</p>,
@@ -350,7 +350,7 @@ describe( 'effects', () => {
 			expect( dispatch ).toHaveBeenCalledTimes( 1 );
 			expect( dispatch ).toHaveBeenCalledWith( expect.objectContaining( {
 				notice: {
-					content: <p><span>Post updated!</span>{ ' ' }<a>{ 'View post' }</a></p>, // eslint-disable-line jsx-a11y/anchor-is-valid
+					content: <p>Post updated!{ ' ' }<a>{ 'View post' }</a></p>, // eslint-disable-line jsx-a11y/anchor-is-valid
 					id: 'SAVE_POST_NOTICE_ID',
 					isDismissible: true,
 					status: 'success',

lib/client-assets.php

@@ -932,6 +932,35 @@ function gutenberg_capture_code_editor_settings( $settings ) {
 	return false;
 }
 
+/**
+ * Retrieve a stored autosave that is newer than the post save.
+ *
+ * Deletes autosaves that are older than the post save.
+ *
+ * @param  WP_Post $post Post object.
+ * @return WP_Post|boolean The post autosave. False if none found.
+ */
+function get_autosave_newer_than_post_save( $post ) {
+	// Add autosave data if it is newer and changed.
+	$autosave = wp_get_post_autosave( $post->ID );
+
+	if ( ! $autosave ) {
+		return false;
+	}
+
+	// Check if the autosave is newer than the current post.
+	if (
+		mysql2date( 'U', $autosave->post_modified_gmt, false ) > mysql2date( 'U', $post->post_modified_gmt, false )
+	) {
+		return $autosave;
+	}
+
+	// If the autosave isn't newer, remove it.
+	wp_delete_post_revision( $autosave->ID );
+
+	return false;
+}
+
 /**
  * Scripts & Styles.
  *
@@ -1104,6 +1133,13 @@ function gutenberg_editor_scripts_and_styles( $hook ) {
 		'autosaveInterval'    => 10,
 	);
 
+	$post_autosave = get_autosave_newer_than_post_save( $post );
+	if ( $post_autosave ) {
+		$editor_settings['autosave'] = array(
+			'editLink' => add_query_arg( 'gutenberg', true, get_edit_post_link( $post_autosave->ID ) ),
+		);
+	}
+
 	if ( ! empty( $color_palette ) ) {
 		$editor_settings['colors'] = $color_palette;
 	}