Store importTitle in document, and display in sub heading

Change-Id: I431b721d8af3180b78a565e322a45745d06f67a1

extension.json

@@ -520,7 +520,8 @@
 			],
 			"messages" : [
 				"collabpad",
-				"collabpad-doctitle"
+				"collabpad-doctitle",
+				"collabpad-import-subtitle"
 			],
 			"targets": [
 				"desktop",

i18n/ve-mw/en.json

@@ -63,6 +63,7 @@
 	"apihelp-visualeditoredit-param-wikitext": "The wikitext to act with.",
 	"apihelp-visualeditoredit-summary": "Save an HTML5 page to MediaWiki (converted to wikitext via the Parsoid service).",
 	"collabpad-doctitle": "CollabPad: $1",
+	"collabpad-import-subtitle": "Imported from $1",
 	"collabpad": "CollabPad",
 	"tooltip-ca-createsource": "Create the source code of this page",
 	"tooltip-ca-edit": "Edit this page using wikitext",

i18n/ve-mw/qqq.json

@@ -77,6 +77,7 @@
 	"apihelp-visualeditoredit-param-wikitext": "{{doc-apihelp-param|visualeditoredit|wikitext}}",
 	"apihelp-visualeditoredit-summary": "{{doc-apihelp-summary|visualeditoredit}}",
 	"collabpad-doctitle": "Name of CollabPad special page with a document subtitle",
+	"collabpad-import-subtitle": "Subtitle of CollabPad page, linking to the page the content was imported from",
 	"collabpad": "Name of CollabPad special page",
 	"tooltip-ca-createsource": "Tooltip of the {{msg-mw|Visualeditor-ca-createsource}} tab, used if the page does not exist.\n\nSee also:\n* {{msg-mw|Tooltip-ca-editsource}} - tooltip of the {{msg-mw|Visualeditor-ca-editsource}} tab, used if the page already exists",
 	"tooltip-ca-edit": "Over-ridden tooltip of the wikitext \"Edit source\" tab.",

modules/ve-mw-collab/ve.init.mw.CollabTarget.js

@@ -27,7 +27,7 @@ ve.init.mw.CollabTarget = function VeInitMwCollabTarget( title, rebaserUrl, conf
 
 	this.title = title;
 	this.rebaserUrl = rebaserUrl;
-	this.importTitle = config.importTitle;
+	this.importTitle = config.importTitle || null;
 
 	// Parent constructor
 	ve.init.mw.CollabTarget.super.call( this, config );
@@ -101,6 +101,7 @@ ve.init.mw.CollabTarget.prototype.transformPage = function () {
  */
 ve.init.mw.CollabTarget.prototype.restorePage = function () {
 	this.$element.parent().append( this.$originalContent.children() );
+	$( '#contentSub' ).empty();
 };
 
 /**
@@ -175,17 +176,25 @@ ve.init.mw.CollabTarget.prototype.setSurface = function ( surface ) {
 		);
 
 		synchronizer.once( 'initDoc', function () {
-			var initPromise;
+			var initPromise, title;
 
 			if ( target.importTitle && !surface.getModel().getDocument().getCompleteHistoryLength() ) {
 				initPromise = mw.libs.ve.targetLoader.requestParsoidData( target.importTitle.toString(), { targetName: 'collabpad' } ).then( function ( response ) {
-					var doc, dmDoc,
+					var doc, dmDoc, fragment,
 						content = ve.getProp( response, 'visualeditor', 'content' );
 
 					if ( content ) {
 						doc = target.constructor.static.parseDocument( content );
 						dmDoc = target.constructor.static.createModelFromDom( doc );
-						surface.getModel().getLinearFragment( new ve.Range( 0, 2 ) ).insertDocument( dmDoc );
+						fragment = surface.getModel().getLinearFragment( new ve.Range( 0, 2 ) );
+						fragment.insertDocument( dmDoc );
+						// Store the importTitle as a hidden meta item
+						if ( target.importTitle ) {
+							fragment.collapseToEnd().insertContent( [
+								{ type: 'alienMeta', attributes: { importTitle: target.importTitle.toString() } },
+								{ type: '/alienMeta' }
+							] );
+						}
 						surface.getModel().selectFirstContentOffset();
 					} else {
 						// Import failed
@@ -205,6 +214,17 @@ ve.init.mw.CollabTarget.prototype.setSurface = function ( surface ) {
 				surface.getModel().selectFirstContentOffset();
 				// Resolve progress bar
 				importDeferred.resolve();
+				if ( ( title = target.getImportTitle() ) ) {
+					$( '#contentSub' ).html(
+						ve.htmlMsg(
+							'collabpad-import-subtitle',
+							$( '<a>' ).attr( 'href', title.getUrl() ).text( title.getMainText() )
+						)
+					);
+					ve.targetLinksToNewWindow( $( '#contentSub' )[ 0 ] );
+				} else {
+					$( '#contentSub' ).empty();
+				}
 			} );
 		} );
 
@@ -215,6 +235,28 @@ ve.init.mw.CollabTarget.prototype.setSurface = function ( surface ) {
 	ve.init.mw.CollabTarget.super.prototype.setSurface.apply( this, arguments );
 };
 
+/**
+ * Get the title of the imported document, if there was one
+ *
+ * @return {mw.Title|null} Title of imported document
+ */
+ve.init.mw.CollabTarget.prototype.getImportTitle = function () {
+	var surfaceModel,
+		target = this;
+
+	if ( !this.importTitle ) {
+		surfaceModel = this.getSurface().getModel();
+		surfaceModel.getMetaList().getItemsInGroup( 'misc' ).some( function ( item ) {
+			var importTitle = item.getAttribute( 'importTitle' );
+			if ( importTitle ) {
+				target.importTitle = mw.Title.newFromText( importTitle );
+				return true;
+			}
+		} );
+	}
+	return this.importTitle;
+};
+
 /* Registration */
 
 ve.init.mw.targetFactory.register( ve.init.mw.CollabTarget );