scroll/src/common/editor/editor.ts

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import Ansi from './ansi.ts';
import Buffer from './buffer.ts';
import { importDefaultForRuntime } from '../runtime.ts';
import { ctrl_key } from '../strings.ts';
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export class Editor {
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#buffer: Buffer;
constructor() {
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this.#buffer = new Buffer();
}
/**
* Determine what to do based on input
* @param input - the decoded chunk of stdin
*/
public processKeyPress(input: string): boolean {
switch (input) {
case ctrl_key('q'):
this.clearScreen();
return false;
default:
return true;
}
}
/**
* Clear the screen and write out the buffer
*/
public async refreshScreen(): Promise<void> {
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const { write } = await importDefaultForRuntime('terminal_io');
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this.clearScreen();
this.drawRows();
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await write(this.#buffer.getBuffer());
this.#buffer.clear();
}
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private drawRows(): void {
for (let y = 0; y <= 24; y++) {
this.#buffer.appendLine('~');
}
}
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private clearScreen(): void {
this.#buffer.append(Ansi.ClearScreen);
this.#buffer.append(Ansi.ResetCursor);
}
}