57 lines
1.6 KiB
TypeScript
57 lines
1.6 KiB
TypeScript
import { BufferLocation, BufferSize, Char, Color } from "./base.ts";
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import { Display } from "./display.ts";
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/**
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* ANSI terminal display
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*/
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export class AnsiTerminalDisplay implements Display {
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private palette_bg: readonly Uint8Array[] = [];
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private palette_fg: readonly Uint8Array[] = [];
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constructor(
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private writer: Deno.Writer = Deno.stdout,
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private reader: Deno.Reader = Deno.stdin,
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) {
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}
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async getSize(): Promise<BufferSize> {
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const size = Deno.consoleSize(Deno.stdout.rid);
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return {
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w: size.columns,
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h: size.rows,
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};
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}
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async setupPalette(colors: readonly Color[]): Promise<readonly Color[]> {
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// TODO handle not fully rgb compatible terminals
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const cr = (x: number) => Math.round(x * 255);
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this.palette_bg = colors.map((col) =>
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escape(`[48;2;${cr(col.r)};${cr(col.g)};${cr(col.b)}m`)
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);
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this.palette_fg = colors.map((col) =>
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escape(`[38;2;${cr(col.r)};${cr(col.g)};${cr(col.b)}m`)
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);
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return colors;
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}
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async clear(): Promise<void> {
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await this.writer.write(CLEAR);
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}
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async setChar(at: BufferLocation, char: Char): Promise<void> {
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// TODO do not move the cursor if already at good location
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// TODO do not change the color if already good
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const fg = this.palette_fg[char.fg];
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const bg = this.palette_bg[char.bg];
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await this.writer.write(fg);
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await this.writer.write(bg);
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await this.writer.write(escape(`[${at.y};${at.x}H${char.ch}`));
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}
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}
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function escape(sequence: string): Uint8Array {
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return new Uint8Array([0x1B, ...new TextEncoder().encode(sequence)]);
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}
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const CLEAR = escape("[2J");
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