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text.js
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Fri, Feb 14, 06:07

text.js
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const color = require('kleur');
const Prompt = require('./prompt');
const { erase, cursor } = require('sisteransi');
const { style, clear, lines, figures } = require('../util');
/**
* TextPrompt Base Element
* @param {Object} opts Options
* @param {String} opts.message Message
* @param {String} [opts.style='default'] Render style
* @param {String} [opts.initial] Default value
* @param {Function} [opts.validate] Validate function
* @param {Stream} [opts.stdin] The Readable stream to listen to
* @param {Stream} [opts.stdout] The Writable stream to write readline data to
* @param {String} [opts.error] The invalid error label
*/
class TextPrompt extends Prompt {
constructor(opts={}) {
super(opts);
this.transform = style.render(opts.style);
this.scale = this.transform.scale;
this.msg = opts.message;
this.initial = opts.initial || ``;
this.validator = opts.validate || (() => true);
this.value = ``;
this.errorMsg = opts.error || `Please Enter A Valid Value`;
this.cursor = Number(!!this.initial);
this.cursorOffset = 0;
this.clear = clear(``, this.out.columns);
this.render();
}
set value(v) {
if (!v && this.initial) {
this.placeholder = true;
this.rendered = color.gray(this.transform.render(this.initial));
} else {
this.placeholder = false;
this.rendered = this.transform.render(v);
}
this._value = v;
this.fire();
}
get value() {
return this._value;
}
reset() {
this.value = ``;
this.cursor = Number(!!this.initial);
this.cursorOffset = 0;
this.fire();
this.render();
}
exit() {
this.abort();
}
abort() {
this.value = this.value || this.initial;
this.done = this.aborted = true;
this.error = false;
this.red = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
async validate() {
let valid = await this.validator(this.value);
if (typeof valid === `string`) {
this.errorMsg = valid;
valid = false;
}
this.error = !valid;
}
async submit() {
this.value = this.value || this.initial;
this.cursorOffset = 0;
this.cursor = this.rendered.length;
await this.validate();
if (this.error) {
this.red = true;
this.fire();
this.render();
return;
}
this.done = true;
this.aborted = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
next() {
if (!this.placeholder) return this.bell();
this.value = this.initial;
this.cursor = this.rendered.length;
this.fire();
this.render();
}
moveCursor(n) {
if (this.placeholder) return;
this.cursor = this.cursor+n;
this.cursorOffset += n;
}
_(c, key) {
let s1 = this.value.slice(0, this.cursor);
let s2 = this.value.slice(this.cursor);
this.value = `${s1}${c}${s2}`;
this.red = false;
this.cursor = this.placeholder ? 0 : s1.length+1;
this.render();
}
delete() {
if (this.isCursorAtStart()) return this.bell();
let s1 = this.value.slice(0, this.cursor-1);
let s2 = this.value.slice(this.cursor);
this.value = `${s1}${s2}`;
this.red = false;
if (this.isCursorAtStart()) {
this.cursorOffset = 0
} else {
this.cursorOffset++;
this.moveCursor(-1);
}
this.render();
}
deleteForward() {
if(this.cursor*this.scale >= this.rendered.length || this.placeholder) return this.bell();
let s1 = this.value.slice(0, this.cursor);
let s2 = this.value.slice(this.cursor+1);
this.value = `${s1}${s2}`;
this.red = false;
if (this.isCursorAtEnd()) {
this.cursorOffset = 0;
} else {
this.cursorOffset++;
}
this.render();
}
first() {
this.cursor = 0;
this.render();
}
last() {
this.cursor = this.value.length;
this.render();
}
left() {
if (this.cursor <= 0 || this.placeholder) return this.bell();
this.moveCursor(-1);
this.render();
}
right() {
if (this.cursor*this.scale >= this.rendered.length || this.placeholder) return this.bell();
this.moveCursor(1);
this.render();
}
isCursorAtStart() {
return this.cursor === 0 || (this.placeholder && this.cursor === 1);
}
isCursorAtEnd() {
return this.cursor === this.rendered.length || (this.placeholder && this.cursor === this.rendered.length + 1)
}
render() {
if (this.closed) return;
if (!this.firstRender) {
if (this.outputError)
this.out.write(cursor.down(lines(this.outputError, this.out.columns) - 1) + clear(this.outputError, this.out.columns));
this.out.write(clear(this.outputText, this.out.columns));
}
super.render();
this.outputError = '';
this.outputText = [
style.symbol(this.done, this.aborted),
color.bold(this.msg),
style.delimiter(this.done),
this.red ? color.red(this.rendered) : this.rendered
].join(` `);
if (this.error) {
this.outputError += this.errorMsg.split(`\n`)
.reduce((a, l, i) => a + `\n${i ? ' ' : figures.pointerSmall} ${color.red().italic(l)}`, ``);
}
this.out.write(erase.line + cursor.to(0) + this.outputText + cursor.save + this.outputError + cursor.restore + cursor.move(this.cursorOffset, 0));
}
}
module.exports = TextPrompt;

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