import { lockStdin } from "https://deno.land/x/ayonli_jsext@v0.9.72/esm/workerd/cli.js";
Requests the standard input to be used only by the given task until it is completed.
This function sets the stdin in raw mode, and excludes other parts of the
program from reading from it at the same time . This is important so that our
program won't be affected by other tasks, especially in a REPL environment.
Examples
Example 1
Example 1
// A simple program that reads a line of text from user input.
import process from "node:process";
import bytes, { equals } from "@ayonli/jsext/bytes";
import { chars } from "@ayonli/jsext/string";
import {
ControlKeys,
ControlSequences,
lockStdin,
readStdin,
writeStdout,
isTypingInput,
moveLeftBy,
} from "@ayonli/jsext/cli";
const input = await lockStdin(async () => {
await writeStdout(bytes("Type something: "));
const buf: string[] = []
while (true) {
const input = await readStdin();
if (equals(input, ControlKeys.CTRL_C) || equals(input, ControlKeys.ESC)) {
console.error("\nUser cancelled");
process.exit(1);
} else if (equals(input, ControlKeys.CR) || equals(input, ControlKeys.LF)) {
await writeStdout(ControlKeys.LF);
break;
} else if (equals(input, ControlKeys.BS) || equals(input, ControlKeys.DEL)) {
if (buf.length > 0) {
const char = buf.pop()!;
await moveLeftBy(char);
await writeStdout(ControlSequences.CLR_RIGHT);
}
} else if (isTypingInput(input)) {
buf.push(...chars(String(input)));
await writeStdout(input);
}
}
return buf.join("")
});
console.log(`You typed: ${input}`);