/**
* Rainbow Editor - highlights "ultrathink" with animated shine effect
*
* Usage: pi --extension ./examples/extensions/rainbow-editor.ts
*/
import { CustomEditor, type ExtensionAPI } from "@earendil-works/pi-coding-agent";
// Base colors (coral → yellow → green → teal → blue → purple → pink)
const COLORS: [number, number, number][] = [
[233, 137, 115], // coral
[228, 186, 103], // yellow
[141, 192, 122], // green
[102, 194, 179], // teal
[121, 157, 207], // blue
[157, 134, 195], // purple
[206, 130, 172], // pink
];
const RESET = "\x1b[0m";
function brighten(rgb: [number, number, number], factor: number): string {
const [r, g, b] = rgb.map((c) => Math.round(c + (255 - c) * factor));
return `\x1b[38;2;${r};${g};${b}m`;
}
function colorize(text: string, shinePos: number): string {
return (
[...text]
.map((c, i) => {
const baseColor = COLORS[i % COLORS.length]!;
// 3-letter shine: center bright, adjacent dimmer
let factor = 0;
if (shinePos >= 0) {
const dist = Math.abs(i - shinePos);
if (dist === 0) factor = 0.7;
else if (dist === 1) factor = 0.35;
}
return `${brighten(baseColor, factor)}${c}`;
})
.join("") + RESET
);
}
class RainbowEditor extends CustomEditor {
private animationTimer?: ReturnType<typeof setInterval>;
private frame = 0;
private hasUltrathink(): boolean {
return /ultrathink/i.test(this.getText());
}
private startAnimation(): void {
if (this.animationTimer) return;
this.animationTimer = setInterval(() => {
this.frame++;
this.tui.requestRender();
}, 60);
}
private stopAnimation(): void {
if (this.animationTimer) {
clearInterval(this.animationTimer);
this.animationTimer = undefined;
}
}
handleInput(data: string): void {
super.handleInput(data);
if (this.hasUltrathink()) {
this.startAnimation();
} else {
this.stopAnimation();
}
}
render(width: number): string[] {
// Cycle: 10 shine positions + 10 pause frames
const cycle = this.frame % 20;
const shinePos = cycle < 10 ? cycle : -1; // -1 means no shine (pause)
return super.render(width).map((line) => line.replace(/ultrathink/gi, (m) => colorize(m, shinePos)));
}
}
export default function (pi: ExtensionAPI) {
pi.on("session_start", (_event, ctx) => {
ctx.ui.setEditorComponent((tui, theme, kb) => new RainbowEditor(tui, theme, kb));
});
}