add image selector field type, modal component, and new snippet widgets

shared/naturalcrit/codeEditor/helpers/widget-elements/image-selector/image-selector.jsx

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+require('./image-selector.less');
+const React = require('react');
+const ReactDOMClient = require('react-dom/client');
+const createClass = require('create-react-class');
+const Modal = require('../modal/modal.jsx');
+const { PATTERNS } = require('../constants.js');
+const CodeMirror = require('../../../code-mirror.js');
+const _ = require('lodash');
+
+const ImageSelector = createClass({
+	modalRef : React.createRef(),
+
+	getDefaultProps : function () {
+		return {
+			field : {},
+			cm    : {},
+			n     : undefined
+		};
+	},
+
+	getInitialState : function() {
+		return {
+			selected : undefined,
+		};
+	},
+
+	componentDidMount : function() {
+		const el = document.createElement('div');
+		const root = ReactDOMClient.createRoot(el);
+		document.querySelector('body').append(el);
+		this.setState({
+			el,
+			modalRoot : root
+		});
+	},
+
+	componentDidUpdate : function() {
+		const { name, preview, values } = this.props.field;
+		const { selected } = this.state;
+
+		const images = values.map((v, i)=>{
+			const className = selected === v ? 'selected' : '';
+			return <img key={i} className={className} src={preview(v)} alt={`${name} image ${v}`} onClick={()=>this.select(v)}/>;
+		});
+
+		this.state.modalRoot?.render(<Modal ref={this.modalRef} header={_.startCase(name)} save={this.save}>
+			<div className={'images'}>
+				{images}
+			</div>
+		</Modal>);
+	},
+
+	componentWillUnmount : function() {
+		this.state.el.remove();
+	},
+
+	save : function() {
+		const { cm, field, n } = this.props;
+		const { text } = cm.lineInfo(n);
+		const pattern = PATTERNS.field[field.type](field.name);
+		const [fullmatch, label, current] = text.match(pattern);
+		if(!fullmatch) {
+			console.warn('something is wrong... please report this warning with a screenshot');
+			return;
+		}
+		const currentText = `${label}${current ?? ''}`;
+		const index = 2;
+		const value = label + this.state.selected;
+		console.log(text, pattern, currentText, value, fullmatch, label, current);
+		cm.replaceRange(value, CodeMirror.Pos(n, index), CodeMirror.Pos(n, index + currentText.length), '+insert');
+	},
+
+	select : function(value) {
+		this.setState({
+			selected : value
+		});
+	},
+
+	render : function () {
+		return <React.Fragment>
+			<button onClick={()=>this.modalRef.current.setVisible(true)}>Select Image</button>
+		</React.Fragment>;
+	}
+});
+
+module.exports = ImageSelector;

shared/naturalcrit/codeEditor/helpers/widget-elements/image-selector/image-selector.less

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+.images {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+
+  img {
+    flex: 0 0 auto;
+    max-width: 10vw;
+    max-height: 20vh;
+    border-radius: 10px;
+
+    &:hover {
+      background-color: rgba(0, 0, 0, .1);
+    }
+
+    &.selected {
+      background-color: rgba(0, 0, 0, .175);
+    }
+  }
+}
+