Desktop: Improve beta editor support for the Rich Markdown plugin

.eslintignore

@@ -603,6 +603,7 @@ packages/default-plugins/utils/getCurrentCommitHash.js
 packages/default-plugins/utils/getPathToPatchFileFor.js
 packages/default-plugins/utils/readRepositoryJson.js
 packages/default-plugins/utils/waitForCliInput.js
+packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5BuiltInOptions.js
 packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5Emulation.test.js
 packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5Emulation.js
 packages/editor/CodeMirror/CodeMirror5Emulation/Decorator.js

.gitignore

@@ -583,6 +583,7 @@ packages/default-plugins/utils/getCurrentCommitHash.js
 packages/default-plugins/utils/getPathToPatchFileFor.js
 packages/default-plugins/utils/readRepositoryJson.js
 packages/default-plugins/utils/waitForCliInput.js
+packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5BuiltInOptions.js
 packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5Emulation.test.js
 packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5Emulation.js
 packages/editor/CodeMirror/CodeMirror5Emulation/Decorator.js

packages/app-desktop/app.ts

@@ -201,8 +201,10 @@ class Application extends BaseApplication {
 
 		// The '*' and '!important' parts are necessary to make sure Russian text is displayed properly
 		// https://github.com/laurent22/joplin/issues/155
+		//
+		// Note: Be careful about the specificity here. Incorrect specificity can break monospaced fonts in tables.
 
-		const css = `.CodeMirror *, .cm-editor .cm-content { font-family: ${fontFamilies.join(', ')} !important; }`;
+		const css = `.CodeMirror5 *, .cm-editor .cm-content { font-family: ${fontFamilies.join(', ')} !important; }`;
 		const styleTag = document.createElement('style');
 		styleTag.type = 'text/css';
 		styleTag.appendChild(document.createTextNode(css));

packages/app-desktop/gui/NoteEditor/NoteBody/CodeMirror/v5/Editor.tsx

@@ -283,7 +283,7 @@ function Editor(props: EditorProps, ref: any) {
 		}
 	}, [pluginOptions, editor]);
 
-	return <div className='codeMirrorEditor' style={props.style} ref={editorParent} />;
+	return <div className='codeMirrorEditor CodeMirror5' style={props.style} ref={editorParent} />;
 }
 
 export default forwardRef(Editor);

packages/app-desktop/gui/NoteEditor/NoteBody/CodeMirror/v6/Editor.tsx

@@ -98,6 +98,12 @@ const Editor = (props: Props, ref: ForwardedRef<CodeMirrorControl>) => {
 		const editor = createEditor(editorContainerRef.current, editorProps);
 		editor.addStyles({
 			'.cm-scroller': { overflow: 'auto' },
+			'&.CodeMirror': {
+				height: 'unset',
+				background: 'unset',
+				overflow: 'unset',
+				direction: 'unset',
+			},
 		});
 		setEditor(editor);
 

packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5BuiltInOptions.ts

@@ -0,0 +1,83 @@
+import { Compartment, Extension, RangeSetBuilder, StateEffect } from '@codemirror/state';
+import { Decoration, DecorationSet, EditorView, ViewPlugin, ViewUpdate } from '@codemirror/view';
+
+const activeLineDecoration = Decoration.line({ class: 'CodeMirror-activeline CodeMirror-activeline-background' });
+
+const optionToExtension: Record<string, Extension> = {
+	'styleActiveLine': [
+		ViewPlugin.fromClass(class {
+			public decorations: DecorationSet;
+
+			public constructor(view: EditorView) {
+				this.updateDecorations(view);
+			}
+
+			public update(update: ViewUpdate) {
+				this.updateDecorations(update.view);
+			}
+
+			private updateDecorations(view: EditorView) {
+				const builder = new RangeSetBuilder<Decoration>();
+				let lastLine = -1;
+
+				for (const selection of view.state.selection.ranges) {
+					const startLine = selection.from;
+					const line = view.state.doc.lineAt(startLine);
+
+					if (line.number !== lastLine) {
+						builder.add(line.from, line.from, activeLineDecoration);
+					}
+
+					lastLine = line.number;
+				}
+
+				this.decorations = builder.finish();
+			}
+		}, {
+			decorations: plugin => plugin.decorations,
+		}),
+		EditorView.baseTheme({
+			'&dark .CodeMirror-activeline-background': {
+				background: '#3304',
+				color: 'white',
+			},
+			'&light .CodeMirror-activeline-background': {
+				background: '#7ff4',
+				color: 'black',
+			},
+		}),
+	],
+};
+
+// Maps several CM5 options to CM6 extensions
+export default class CodeMirror5BuiltInOptions {
+	private activeOptions: string[] = [];
+	private extensionCompartment: Compartment = new Compartment();
+
+	public constructor(private editor: EditorView) {
+		editor.dispatch({
+			effects: StateEffect.appendConfig.of(this.extensionCompartment.of([])),
+		});
+	}
+
+	private updateExtensions() {
+		const extensions = this.activeOptions.map(option => optionToExtension[option]);
+		this.editor.dispatch({
+			effects: this.extensionCompartment.reconfigure(extensions),
+		});
+	}
+
+	public supportsOption(option: string) {
+		return optionToExtension.hasOwnProperty(option);
+	}
+
+	public setOption(optionName: string, value: boolean) {
+		this.activeOptions = this.activeOptions.filter(other => other !== optionName);
+
+		if (value) {
+			this.activeOptions.push(optionName);
+		}
+
+		this.updateExtensions();
+	}
+}

packages/editor/CodeMirror/CodeMirror5Emulation/CodeMirror5Emulation.ts

@@ -8,6 +8,7 @@ import { StateEffect } from '@codemirror/state';
 import { StreamParser } from '@codemirror/language';
 import Decorator, { LineWidgetOptions, MarkTextOptions } from './Decorator';
 import insertLineAfter from '../editorCommands/insertLineAfter';
+import CodeMirror5BuiltInOptions from './CodeMirror5BuiltInOptions';
 const { pregQuote } = require('@joplin/lib/string-utils-common');
 
 
@@ -52,6 +53,7 @@ export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
 	private _options: Record<string, CodeMirror5OptionRecord> = Object.create(null);
 	private _decorator: Decorator;
 	private _decoratorExtension: Extension;
+	private _builtInOptions: CodeMirror5BuiltInOptions;
 
 	// Used by some plugins to store state.
 	public state: Record<string, any> = Object.create(null);
@@ -70,6 +72,7 @@ export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
 		const { decorator, extension: decoratorExtension } = Decorator.create(editor);
 		this._decorator = decorator;
 		this._decoratorExtension = decoratorExtension;
+		this._builtInOptions = new CodeMirror5BuiltInOptions(editor);
 
 		editor.dispatch({
 			effects: StateEffect.appendConfig.of(this.makeCM6Extensions()),
@@ -129,10 +132,8 @@ export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
 				return { dom };
 			}),
 
-			// Note: We can allow legacy CM5 CSS to apply to the editor
-			// with a line similar to the following:
-			//    EditorView.editorAttributes.of({ class: 'CodeMirror' }),
-			// Many of these styles, however, don't work well with CodeMirror 6.
+			// Allows legacy CM5 CSS to apply to the editor:
+			EditorView.editorAttributes.of({ class: 'CodeMirror' }),
 		];
 	}
 
@@ -316,6 +317,8 @@ export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
 			const oldValue = this._options[name].value;
 			this._options[name].value = value;
 			this._options[name].onUpdate(this, value, oldValue);
+		} else if (this._builtInOptions.supportsOption(name)) {
+			this._builtInOptions.setOption(name, value);
 		} else {
 			super.setOption(name, value);
 		}
@@ -329,6 +332,20 @@ export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
 		}
 	}
 
+	public override coordsChar(coords: { left: number; top: number }, mode?: 'div' | 'local'): DocumentPosition {
+		// codemirror-vim's API only supports "div" mode. Thus, we convert
+		// local to div:
+		if (mode !== 'div') {
+			const bbox = this.editor.contentDOM.getBoundingClientRect();
+			coords = {
+				left: coords.left - bbox.left,
+				top: coords.top - bbox.top,
+			};
+		}
+
+		return super.coordsChar(coords, 'div');
+	}
+
 	// codemirror-vim's API doesn't match the API docs here -- it expects addOverlay
 	// to return a SearchQuery. As such, this override returns "any".
 	public override addOverlay<State>(modeObject: OverlayType<State>): any {
@@ -353,7 +370,26 @@ export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
 	}
 
 	public addLineWidget(lineNumber: number, node: HTMLElement, options: LineWidgetOptions) {
-		this._decorator.addLineWidget(lineNumber, node, options);
+		return this._decorator.addLineWidget(lineNumber, node, options);
+	}
+
+	public addWidget(pos: DocumentPosition, node: HTMLElement) {
+		if (node.parentElement) {
+			node.remove();
+		}
+
+		const loc = posFromDocumentPosition(this.editor.state.doc, pos);
+		const screenCoords = this.editor.coordsAtPos(loc);
+		const bbox = this.editor.contentDOM.getBoundingClientRect();
+
+		node.style.position = 'absolute';
+
+		const left = screenCoords.left - bbox.left;
+		node.style.left = `${left}px`;
+		node.style.maxWidth = `${bbox.width - left}px`;
+		node.style.top = `${screenCoords.top + this.editor.scrollDOM.scrollTop}px`;
+
+		this.editor.scrollDOM.appendChild(node);
 	}
 
 	public markText(from: DocumentPosition, to: DocumentPosition, options?: MarkTextOptions) {

packages/editor/CodeMirror/CodeMirror5Emulation/Decorator.ts

@@ -68,6 +68,9 @@ class WidgetDecorationWrapper extends WidgetType {
 			container.classList.add(this.options.className);
 		}
 
+		// Applies margins and related CSS:
+		container.classList.add('cm-line');
+
 		return container;
 	}
 }

packages/editor/CodeMirror/markdown/decoratorExtension.ts

@@ -49,27 +49,27 @@ const blockQuoteDecoration = Decoration.line({
 });
 
 const header1LineDecoration = Decoration.line({
-	attributes: { class: 'cm-h1 cm-headerLine' },
+	attributes: { class: 'cm-h1 cm-headerLine cm-header' },
 });
 
 const header2LineDecoration = Decoration.line({
-	attributes: { class: 'cm-h2 cm-headerLine' },
+	attributes: { class: 'cm-h2 cm-headerLine cm-header' },
 });
 
 const header3LineDecoration = Decoration.line({
-	attributes: { class: 'cm-h3 cm-headerLine' },
+	attributes: { class: 'cm-h3 cm-headerLine cm-header' },
 });
 
 const header4LineDecoration = Decoration.line({
-	attributes: { class: 'cm-h4 cm-headerLine' },
+	attributes: { class: 'cm-h4 cm-headerLine cm-header' },
 });
 
 const header5LineDecoration = Decoration.line({
-	attributes: { class: 'cm-h5 cm-headerLine' },
+	attributes: { class: 'cm-h5 cm-headerLine cm-header' },
 });
 
 const header6LineDecoration = Decoration.line({
-	attributes: { class: 'cm-h6 cm-headerLine' },
+	attributes: { class: 'cm-h6 cm-headerLine cm-header' },
 });
 
 const tableHeaderDecoration = Decoration.line({

packages/editor/CodeMirror/pluginApi/PluginLoader.ts

@@ -132,7 +132,7 @@ export default class PluginLoader {
 				pluginId: plugin.pluginId,
 				contentScriptId: plugin.contentScriptId,
 			};
-			const loadedPlugin = exports.default(context);
+			const loadedPlugin = exports.default(context) ?? {};
 
 			loadedPlugin.plugin?.(this.editor);
 

packages/editor/CodeMirror/theme.ts

@@ -85,10 +85,12 @@ const createTheme = (theme: EditorTheme): Extension[] => {
 	};
 
 	const codeMirrorTheme = EditorView.theme({
-		'&': baseGlobalStyle,
+		// Include &.CodeMirror to handle the case where additional CodeMirror 5 styles
+		// need to be overridden.
+		'&, &.CodeMirror': baseGlobalStyle,
 
 		// These must be !important or more specific than CodeMirror's built-ins
-		'.cm-content': {
+		'& .cm-content': {
 			fontFamily: theme.fontFamily,
 			...baseContentStyle,
 			paddingBottom: theme.isDesktop ? '400px' : undefined,

packages/tools/cspell/dictionary4.txt

@@ -91,4 +91,5 @@ activatable
 titlewrapper
 notyf
 Notyf
-Prec
+activeline
+Prec