@sertxudeveloper/markdown-editor/src/plugins/unordered-list/UnorderedList.ts

A customizable markdown editor for your projects

import { insertText } from '../../utils/Utils';
import ListStyle from '../ListStyle';
import Plugin from '../Plugin';

import icon from './icon.svg';

export default class UnorderedList extends Plugin {
    getKey(): string {
        return 'unordered-list';
    }

    getIcon(): string {
        return icon;
    }

    getTitle(): string {
        return 'List (Ctrl+Alt+8)';
    }

    onKeyDown(event: KeyboardEvent): void {
        if (event.ctrlKey && event.altKey && event.key === '8') {
            event.preventDefault();
            this.execute();
        }

        if (event.key === 'Enter') {
            const textarea = this.editor.textarea;
            if (!this.editor.textarea) return;

            const line = textarea.value.slice(0, textarea.selectionStart).split('\n').pop();

            // If the previous line is a list item, then we want to add a list item
            if (line && line.startsWith('- ') && line.trim().length > 1) {
                event.preventDefault();
                insertText(textarea, {
                    text: '\n- ',
                    selectionStart: textarea.selectionStart + 3,
                    selectionEnd: textarea.selectionStart + 3,
                });
            }

            // If the current line is an empty list item, then we want to remove the list item
            else if (line && line.startsWith('- ') && line.trim().length === 1) {
                event.preventDefault();

                textarea.selectionStart -= 2;
                insertText(textarea, {
                    text: '',
                    selectionStart: textarea.selectionStart,
                    selectionEnd: textarea.selectionStart,
                });
            }
        }
    }

    execute(value: string = ''): void {
        if (!this.editor.textarea) return;
        const textarea = this.editor.textarea;

        ListStyle.applyStyle(textarea, { prefix: '- ', unorderedList: true });
    }
}