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select.js
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Mon, Feb 10, 13:36

select.js
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'use strict';
const color = require('kleur');
const Prompt = require('./prompt');
const _require = require('../util'),
style = _require.style,
clear = _require.clear,
figures = _require.figures,
wrap = _require.wrap,
entriesToDisplay = _require.entriesToDisplay;
const _require2 = require('sisteransi'),
cursor = _require2.cursor;
/**
* SelectPrompt Base Element
* @param {Object} opts Options
* @param {String} opts.message Message
* @param {Array} opts.choices Array of choice objects
* @param {String} [opts.hint] Hint to display
* @param {Number} [opts.initial] Index of default value
* @param {Stream} [opts.stdin] The Readable stream to listen to
* @param {Stream} [opts.stdout] The Writable stream to write readline data to
* @param {Number} [opts.optionsPerPage=10] Max options to display at once
*/
class SelectPrompt extends Prompt {
constructor(opts = {}) {
super(opts);
this.msg = opts.message;
this.hint = opts.hint || '- Use arrow-keys. Return to submit.';
this.warn = opts.warn || '- This option is disabled';
this.cursor = opts.initial || 0;
this.choices = opts.choices.map((ch, idx) => {
if (typeof ch === 'string') ch = {
title: ch,
value: idx
};
return {
title: ch && (ch.title || ch.value || ch),
value: ch && (ch.value === undefined ? idx : ch.value),
description: ch && ch.description,
selected: ch && ch.selected,
disabled: ch && ch.disabled
};
});
this.optionsPerPage = opts.optionsPerPage || 10;
this.value = (this.choices[this.cursor] || {}).value;
this.clear = clear('', this.out.columns);
this.render();
}
moveCursor(n) {
this.cursor = n;
this.value = this.choices[n].value;
this.fire();
}
reset() {
this.moveCursor(0);
this.fire();
this.render();
}
exit() {
this.abort();
}
abort() {
this.done = this.aborted = true;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
submit() {
if (!this.selection.disabled) {
this.done = true;
this.aborted = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
} else this.bell();
}
first() {
this.moveCursor(0);
this.render();
}
last() {
this.moveCursor(this.choices.length - 1);
this.render();
}
up() {
if (this.cursor === 0) {
this.moveCursor(this.choices.length - 1);
} else {
this.moveCursor(this.cursor - 1);
}
this.render();
}
down() {
if (this.cursor === this.choices.length - 1) {
this.moveCursor(0);
} else {
this.moveCursor(this.cursor + 1);
}
this.render();
}
next() {
this.moveCursor((this.cursor + 1) % this.choices.length);
this.render();
}
_(c, key) {
if (c === ' ') return this.submit();
}
get selection() {
return this.choices[this.cursor];
}
render() {
if (this.closed) return;
if (this.firstRender) this.out.write(cursor.hide);else this.out.write(clear(this.outputText, this.out.columns));
super.render();
let _entriesToDisplay = entriesToDisplay(this.cursor, this.choices.length, this.optionsPerPage),
startIndex = _entriesToDisplay.startIndex,
endIndex = _entriesToDisplay.endIndex; // Print prompt
this.outputText = [style.symbol(this.done, this.aborted), color.bold(this.msg), style.delimiter(false), this.done ? this.selection.title : this.selection.disabled ? color.yellow(this.warn) : color.gray(this.hint)].join(' '); // Print choices
if (!this.done) {
this.outputText += '\n';
for (let i = startIndex; i < endIndex; i++) {
let title,
prefix,
desc = '',
v = this.choices[i]; // Determine whether to display "more choices" indicators
if (i === startIndex && startIndex > 0) {
prefix = figures.arrowUp;
} else if (i === endIndex - 1 && endIndex < this.choices.length) {
prefix = figures.arrowDown;
} else {
prefix = ' ';
}
if (v.disabled) {
title = this.cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
prefix = (this.cursor === i ? color.bold().gray(figures.pointer) + ' ' : ' ') + prefix;
} else {
title = this.cursor === i ? color.cyan().underline(v.title) : v.title;
prefix = (this.cursor === i ? color.cyan(figures.pointer) + ' ' : ' ') + prefix;
if (v.description && this.cursor === i) {
desc = ` - ${v.description}`;
if (prefix.length + title.length + desc.length >= this.out.columns || v.description.split(/\r?\n/).length > 1) {
desc = '\n' + wrap(v.description, {
margin: 3,
width: this.out.columns
});
}
}
}
this.outputText += `${prefix} ${title}${color.gray(desc)}\n`;
}
}
this.out.write(this.outputText);
}
}
module.exports = SelectPrompt;

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