82 lines
1.9 KiB
JavaScript
82 lines
1.9 KiB
JavaScript
import Ansi from './ansi.ts';
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import Buffer from './buffer.ts';
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import {
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ctrl_key,
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importDefaultForRuntime,
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ITerminalSize,
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truncate,
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VERSION,
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} from '../mod.ts';
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export class Editor {
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#buffer: Buffer;
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#screenRows: number;
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#screenCols: number;
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constructor(terminalSize: ITerminalSize) {
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this.#buffer = new Buffer();
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this.#screenRows = terminalSize.rows;
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this.#screenCols = terminalSize.cols;
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}
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/**
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* Determine what to do based on input
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* @param input - the decoded chunk of stdin
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*/
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public processKeyPress(input: string): boolean {
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switch (input) {
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case ctrl_key('q'):
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this.clearScreen().then(() => {});
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return false;
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default:
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return true;
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}
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}
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// -------------------------------------------------------------------------------------------------------------------
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// Terminal Output / Drawing
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// -------------------------------------------------------------------------------------------------------------------
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/**
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* Clear the screen and write out the buffer
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*/
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public async refreshScreen(): Promise<void> {
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this.#buffer.append(Ansi.HideCursor);
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this.#buffer.append(Ansi.ResetCursor);
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this.drawRows();
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this.#buffer.append(Ansi.ShowCursor);
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await this.writeToScreen();
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}
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private async clearScreen(): Promise<void> {
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this.#buffer.append(Ansi.ClearScreen);
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this.#buffer.append(Ansi.ResetCursor);
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await this.writeToScreen();
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}
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private drawRows(): void {
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for (let y = 0; y < this.#screenRows; y++) {
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if (y === this.#screenRows / 3) {
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const message = `Kilo editor -- version ${VERSION}`;
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this.#buffer.append(truncate(message, this.#screenCols));
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} else {
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this.#buffer.append('~');
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}
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this.#buffer.append(Ansi.ClearLine);
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if (y < this.#screenRows - 1) {
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this.#buffer.appendLine('');
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}
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}
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}
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private async writeToScreen(): Promise<void> {
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const io = await importDefaultForRuntime('terminal_io');
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await io.write(this.#buffer.getBuffer());
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this.#buffer.clear();
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}
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}
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