add bins and alternatives

data/home/.local/bin/prefix.ts

@@ -0,0 +1,33 @@
+#!/bin/env -S deno run
+
+import { crayon } from "https://deno.land/x/crayon@3.3.3/mod.ts";
+
+async function read_line() {
+  const buf = new Uint8Array(1024);
+  const n = await Deno.stdin.read(buf);
+  if (n === null) return null;
+  const line = new TextDecoder().decode(buf.subarray(0, n));
+  return line;
+}
+
+function pick<T>(arr: T[]) {
+  const index = Math.floor(arr.length * Math.random());
+  return arr[index];
+}
+
+const [prefix] = Deno.args;
+const colors = [
+  crayon.red,
+  crayon.green,
+  crayon.blue,
+  crayon.yellow,
+  crayon.magenta,
+];
+const color = pick(colors);
+
+while (true) {
+  let line = await read_line();
+  if (line == null) break;
+  line = line.substring(0, line.length - 1);
+  console.log(`${color(`[${prefix}]`)} ${line}`);
+}