145 lines
3.6 KiB
JavaScript
145 lines
3.6 KiB
JavaScript
'use strict';
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const color = require('kleur');
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const Prompt = require('./prompt');
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const { style, clear, figures } = require('../util');
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const { erase, cursor } = require('sisteransi');
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/**
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* SelectPrompt Base Element
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* @param {Object} opts Options
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* @param {String} opts.message Message
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* @param {Array} opts.choices Array of choice objects
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* @param {String} [opts.hint] Hint to display
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* @param {Number} [opts.initial] Index of default value
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* @param {Stream} [opts.stdin] The Readable stream to listen to
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* @param {Stream} [opts.stdout] The Writable stream to write readline data to
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*/
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class SelectPrompt extends Prompt {
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constructor(opts={}) {
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super(opts);
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this.msg = opts.message;
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this.hint = opts.hint || '- Use arrow-keys. Return to submit.';
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this.warn = opts.warn || '- This option is disabled';
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this.cursor = opts.initial || 0;
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this.choices = opts.choices.map((ch, idx) => {
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if (typeof ch === 'string')
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ch = {title: ch, value: idx};
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return {
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title: ch && (ch.title || ch.value || ch),
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value: ch && (ch.value || idx),
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selected: ch && ch.selected,
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disabled: ch && ch.disabled
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};
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});
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this.value = (this.choices[this.cursor] || {}).value;
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this.clear = clear('');
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this.render();
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}
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moveCursor(n) {
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this.cursor = n;
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this.value = this.choices[n].value;
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this.fire();
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}
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reset() {
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this.moveCursor(0);
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this.fire();
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this.render();
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}
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abort() {
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this.done = this.aborted = true;
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this.fire();
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this.render();
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this.out.write('\n');
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this.close();
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}
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submit() {
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if (!this.selection.disabled) {
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this.done = true;
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this.aborted = false;
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this.fire();
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this.render();
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this.out.write('\n');
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this.close();
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} else
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this.bell();
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}
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first() {
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this.moveCursor(0);
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this.render();
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}
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last() {
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this.moveCursor(this.choices.length - 1);
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this.render();
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}
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up() {
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if (this.cursor === 0) return this.bell();
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this.moveCursor(this.cursor - 1);
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this.render();
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}
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down() {
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if (this.cursor === this.choices.length - 1) return this.bell();
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this.moveCursor(this.cursor + 1);
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this.render();
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}
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next() {
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this.moveCursor((this.cursor + 1) % this.choices.length);
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this.render();
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}
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_(c, key) {
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if (c === ' ') return this.submit();
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}
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get selection() {
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return this.choices[this.cursor];
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}
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render() {
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if (this.closed) return;
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if (this.firstRender) this.out.write(cursor.hide);
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else this.out.write(erase.lines(this.choices.length + 1));
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super.render();
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// Print prompt
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this.out.write([
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style.symbol(this.done, this.aborted),
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color.bold(this.msg),
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style.delimiter(false),
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this.done ? this.selection.title : this.selection.disabled
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? color.yellow(this.warn) : color.gray(this.hint)
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].join(' '));
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// Print choices
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if (!this.done) {
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this.out.write(
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'\n' +
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this.choices
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.map((v, i) => {
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let title, prefix;
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if (v.disabled) {
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title = this.cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
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prefix = this.cursor === i ? color.bold().gray(figures.pointer) + ' ' : ' ';
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} else {
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title = this.cursor === i ? color.cyan().underline(v.title) : v.title;
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prefix = this.cursor === i ? color.cyan(figures.pointer) + ' ' : ' ';
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}
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return `${prefix} ${title}`;
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})
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.join('\n')
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);
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}
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}
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}
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module.exports = SelectPrompt;
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