forked from denoland/deno
-
Notifications
You must be signed in to change notification settings - Fork 0
/
41_prompt.js
81 lines (66 loc) · 1.64 KB
/
41_prompt.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
"use strict";
((window) => {
const { stdin } = window.__bootstrap.files;
const { isatty } = window.__bootstrap.tty;
const LF = "\n".charCodeAt(0);
const CR = "\r".charCodeAt(0);
const decoder = new TextDecoder();
const core = window.Deno.core;
function alert(message = "Alert") {
if (!isatty(stdin.rid)) {
return;
}
core.print(`${message} [Enter] `, false);
readLineFromStdinSync();
}
function confirm(message = "Confirm") {
if (!isatty(stdin.rid)) {
return false;
}
core.print(`${message} [y/N] `, false);
const answer = readLineFromStdinSync();
return answer === "Y" || answer === "y";
}
function prompt(message = "Prompt", defaultValue) {
defaultValue ??= null;
if (!isatty(stdin.rid)) {
return null;
}
core.print(`${message} `, false);
if (defaultValue) {
core.print(`[${defaultValue}] `, false);
}
return readLineFromStdinSync() || defaultValue;
}
function readLineFromStdinSync() {
const c = new Uint8Array(1);
const buf = [];
while (true) {
const n = stdin.readSync(c);
if (n === null || n === 0) {
break;
}
if (c[0] === CR) {
const n = stdin.readSync(c);
if (c[0] === LF) {
break;
}
buf.push(CR);
if (n === null || n === 0) {
break;
}
}
if (c[0] === LF) {
break;
}
buf.push(c[0]);
}
return decoder.decode(new Uint8Array(buf));
}
window.__bootstrap.prompt = {
alert,
confirm,
prompt,
};
})(this);