use CodeMirror Documents

Instead of re-building the whole editor box with every tab switch, we just swap in and out CodeMirror "documents".

Maintains undo history, scroll position, highlight coloring, etc.

client/homebrew/editor/editor.jsx

@@ -60,6 +60,10 @@ const Editor = createClass({
 		window.removeEventListener('resize', this.updateEditorSize);
 	},
 
+	componentDidUpdate : function() {
+		this.highlightCustomMarkdown();
+	},
+
 	updateEditorSize : function() {
 		if(this.refs.codeEditor) {
 			let paneHeight = this.refs.main.parentNode.clientHeight;
@@ -177,25 +181,44 @@ const Editor = createClass({
 		this.refs.codeEditor?.updateSize();
 	},
 
+	//Called by CodeEditor after document switch, so Snippetbar can refresh UndoHistory
+	rerenderParent : function (){
+		this.forceUpdate();
+	},
+
 	renderEditor : function(){
 		if(this.isText()){
-			return <CodeEditor key='text'
-				ref='codeEditor'
-				language='gfm'
-				value={this.props.brew.text}
-				onChange={this.props.onTextChange} />;
+			return <>
+				<CodeEditor key='codeEditor'
+					ref='codeEditor'
+					language='gfm'
+					view={this.state.view}
+					value={this.props.brew.text}
+					onChange={this.props.onTextChange}
+					rerenderParent={this.rerenderParent} />
+			</>;
 		}
 		if(this.isStyle()){
-			return <CodeEditor key='style'
-				ref='codeEditor'
-				language='css'
-				value={this.props.brew.style ?? DEFAULT_STYLE_TEXT}
-				onChange={this.props.onStyleChange} />;
+			return <>
+				<CodeEditor key='codeEditor'
+					ref='codeEditor'
+					language='css'
+					view={this.state.view}
+					value={this.props.brew.style ?? DEFAULT_STYLE_TEXT}
+					onChange={this.props.onStyleChange}
+					rerenderParent={this.rerenderParent} />
+			</>;
 		}
 		if(this.isMeta()){
-			return <MetadataEditor
-				metadata={this.props.brew}
-				onChange={this.props.onMetaChange} />;
+			return <>
+				<CodeEditor key='codeEditor'
+					view={this.state.view}
+					style={{ display: 'none', width: '600px' }}
+					rerenderParent={this.rerenderParent} />
+				<MetadataEditor
+					metadata={this.props.brew}
+					onChange={this.props.onMetaChange} />
+			</>;
 		}
 	},
 
@@ -212,7 +235,6 @@ const Editor = createClass({
 	},
 
 	render : function(){
-		this.highlightCustomMarkdown();
 		return (
 			<div className='editor' ref='main'>
 				<SnippetBar
@@ -224,7 +246,7 @@ const Editor = createClass({
 					renderer={this.props.renderer}
 					undo={this.undo}
 					redo={this.redo}
-					historySize={this.historySize} />
+					historySize={this.historySize()} />
 
 				{this.renderEditor()}
 			</div>

client/homebrew/editor/snippetbar/snippetbar.jsx

@@ -63,11 +63,11 @@ const Snippetbar = createClass({
 		if(!this.props.showEditButtons) return;
 
 		return <div className='editors'>
-			<div className={`editorTool undo ${this.props.historySize()?.undo ? 'active' : ''}`}
+			<div className={`editorTool undo ${this.props.historySize.undo ? 'active' : ''}`}
 				onClick={this.props.undo} >
 				<i className='fas fa-undo' />
 			</div>
-			<div className={`editorTool redo ${this.props.historySize()?.redo ? 'active' : ''}`}
+			<div className={`editorTool redo ${this.props.historySize.redo ? 'active' : ''}`}
 				onClick={this.props.redo} >
 				<i className='fas fa-redo' />
 			</div>

shared/naturalcrit/codeEditor/codeEditor.jsx

@@ -25,25 +25,44 @@ const CodeEditor = createClass({
 		};
 	},
 
+	getInitialState : function() {
+		return {
+			docs : {}
+		};
+	},
+
 	componentDidMount : function() {
 		this.buildEditor();
+		this.codeMirror.setValue(this.props.value);
+		this.codeMirror.clearHistory();
 	},
 
 	componentDidUpdate : function(prevProps) {
-		if(prevProps.language !== this.props.language){ //rebuild editor when switching tabs
-			this.buildEditor();
-		}
-		if(this.codeMirror && this.codeMirror.getValue() != this.props.value) { //update editor contents if brew.text is changed from outside
+		if(prevProps.view !== this.props.view){ //view changed; swap documents
+			let newDoc;
+
+			if(!this.state.docs[this.props.view]) {
+				newDoc = CodeMirror.Doc(this.props.value, this.props.language);
+			} else {
+				newDoc = this.state.docs[this.props.view];
+			}
+
+			const oldDoc = { [prevProps.view]: this.codeMirror.swapDoc(newDoc) };
+
+			this.setState((prevState)=>({
+				docs : _.merge({}, prevState.docs, oldDoc)
+			}));
+
+			this.props.rerenderParent();
+		} else if(this.codeMirror?.getValue() != this.props.value) { //update editor contents if brew.text is changed from outside
 			this.codeMirror.setValue(this.props.value);
 		}
 	},
 
 	buildEditor : function() {
 		this.codeMirror = CodeMirror(this.refs.editor, {
-			value             : this.props.value,
 			lineNumbers       : true,
 			lineWrapping      : this.props.wrap,
-			mode              : this.props.language, //TODO: CSS MODE DOESN'T SEEM TO LOAD PROPERLY
 			indentWithTabs    : true,
 			tabSize           : 2,
 			historyEventDelay : 250,
@@ -125,7 +144,7 @@ const CodeEditor = createClass({
 	//----------------------//
 
 	render : function(){
-		return <div className='codeEditor' ref='editor' />;
+		return <div className='codeEditor' ref='editor' style={this.props.style}/>;
 	}
 });