1 files changed, 76 insertions, 0 deletions
diff --git a/resources/src/mediawiki.action/mediawiki.action.edit.stash.js b/resources/src/mediawiki.action/mediawiki.action.edit.stash.js
new file mode 100644
index 00000000..29c533d8
--- /dev/null
+++ b/resources/src/mediawiki.action/mediawiki.action.edit.stash.js
@@ -0,0 +1,76 @@
+/*!
+ * Scripts for pre-emptive edit preparing on action=edit
+ */
+( function ( mw, $ ) {
+	$( function () {
+		var idleTimeout = 4000,
+			api = new mw.Api(),
+			pending = null,
+			$form = $( '#editform' ),
+			$text = $form.find( '#wpTextbox1' ),
+			data = {},
+			timer = null;
+
+		function stashEdit( token ) {
+			data = $form.serializeObject();
+
+			pending = api.post( {
+				action: 'stashedit',
+				token: token,
+				title: mw.config.get( 'wgPageName' ),
+				section: data.wpSection,
+				sectiontitle: '',
+				text: data.wpTextbox1,
+				contentmodel: data.model,
+				contentformat: data.format,
+				baserevid: data.parentRevId
+			} );
+		}
+
+		/* Has the edit body text changed since the last stashEdit() call? */
+		function isChanged() {
+			// Normalize line endings to CRLF, like $.fn.serializeObject does.
+			var newText = $text.val().replace( /\r?\n/g, '\r\n' );
+			return newText !== data.wpTextbox1;
+		}
+
+		function onEditChanged() {
+			if ( !isChanged() ) {
+				return;
+			}
+
+			// If a request is in progress, abort it; its payload is stale.
+			if ( pending ) {
+				pending.abort();
+			}
+
+			api.getToken( 'edit' ).then( stashEdit );
+		}
+
+		function onKeyPress( e ) {
+			// Ignore keystrokes that don't modify text, like cursor movements.
+			// See <http://stackoverflow.com/q/2284844>.
+			if ( e.which === 0 ) {
+				return;
+			}
+
+			clearTimeout( timer );
+
+			if ( pending ) {
+				pending.abort();
+			}
+
+			timer = setTimeout( onEditChanged, idleTimeout );
+		}
+
+		// We don't attempt to stash new section edits because in such cases
+		// the parser output varies on the edit summary (since it determines
+		// the new section's name).
+		if ( $form.find( 'input[name=wpSection]' ).val() === 'new' ) {
+			return;
+		}
+
+		$text.on( { change: onEditChanged, keypress: onKeyPress } );
+
+	} );
+}( mediaWiki, jQuery ) );