setup-python/node_modules/prompts/lib/elements/multiselect.js

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JavaScript
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2019-06-27 08:12:00 +07:00
'use strict';
const color = require('kleur');
const { cursor } = require('sisteransi');
const Prompt = require('./prompt');
const { clear, figures, style } = require('../util');
/**
* MultiselectPrompt 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 {String} [opts.warn] Hint shown for disabled choices
* @param {Number} [opts.max] Max choices
* @param {Number} [opts.cursor=0] Cursor start position
* @param {Stream} [opts.stdin] The Readable stream to listen to
* @param {Stream} [opts.stdout] The Writable stream to write readline data to
*/
class MultiselectPrompt extends Prompt {
constructor(opts={}) {
super(opts);
this.msg = opts.message;
this.cursor = opts.cursor || 0;
this.scrollIndex = opts.cursor || 0;
this.hint = opts.hint || '';
this.warn = opts.warn || '- This option is disabled -';
this.minSelected = opts.min;
this.showMinError = false;
this.maxChoices = opts.max;
this.value = 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 || idx),
selected: ch && ch.selected,
disabled: ch && ch.disabled
};
});
this.clear = clear('');
if (!opts.overrideRender) {
this.render();
}
}
reset() {
this.value.map(v => !v.selected);
this.cursor = 0;
this.fire();
this.render();
}
selected() {
return this.value.filter(v => v.selected);
}
abort() {
this.done = this.aborted = true;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
submit() {
const selected = this.value
.filter(e => e.selected);
if (this.minSelected && selected.length < this.minSelected) {
this.showMinError = true;
this.render();
} else {
this.done = true;
this.aborted = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
}
first() {
this.cursor = 0;
this.render();
}
last() {
this.cursor = this.value.length - 1;
this.render();
}
next() {
this.cursor = (this.cursor + 1) % this.value.length;
this.render();
}
up() {
if (this.cursor === 0) {
this.cursor = this.value.length - 1;
} else {
this.cursor--;
}
this.render();
}
down() {
if (this.cursor === this.value.length - 1) {
this.cursor = 0;
} else {
this.cursor++;
}
this.render();
}
left() {
this.value[this.cursor].selected = false;
this.render();
}
right() {
if (this.value.filter(e => e.selected).length >= this.maxChoices) return this.bell();
this.value[this.cursor].selected = true;
this.render();
}
handleSpaceToggle() {
const v = this.value[this.cursor];
if (v.selected) {
v.selected = false;
this.render();
} else if (v.disabled || this.value.filter(e => e.selected).length >= this.maxChoices) {
return this.bell();
} else {
v.selected = true;
this.render();
}
}
_(c, key) {
if (c === ' ') {
this.handleSpaceToggle();
} else {
return this.bell();
}
}
renderInstructions() {
return `
Instructions:
${figures.arrowUp}/${figures.arrowDown}: Highlight option
${figures.arrowLeft}/${figures.arrowRight}/[space]: Toggle selection
enter/return: Complete answer
`
}
renderOption(cursor, v, i) {
let title;
if (v.disabled) title = cursor === i ? color.gray().underline(v.title) : color.strikethrough().gray(v.title);
else title = cursor === i ? color.cyan().underline(v.title) : v.title;
return (v.selected ? color.green(figures.radioOn) : figures.radioOff) + ' ' + title
}
// shared with autocompleteMultiselect
paginateOptions(options) {
const c = this.cursor;
let styledOptions = options.map((v, i) => this.renderOption(c, v, i));
const numOfOptionsToRender = 10; // if needed, can add an option to change this.
let scopedOptions = styledOptions;
let hint = '';
if (styledOptions.length === 0) {
return color.red('No matches for this query.');
} else if (styledOptions.length > numOfOptionsToRender) {
let startIndex = c - (numOfOptionsToRender / 2);
let endIndex = c + (numOfOptionsToRender / 2);
if (startIndex < 0) {
startIndex = 0;
endIndex = numOfOptionsToRender;
} else if (endIndex > options.length) {
endIndex = options.length;
startIndex = endIndex - numOfOptionsToRender;
}
scopedOptions = styledOptions.slice(startIndex, endIndex);
hint = color.dim('(Move up and down to reveal more choices)');
}
return '\n' + scopedOptions.join('\n') + '\n' + hint;
}
// shared with autocomleteMultiselect
renderOptions(options) {
if (!this.done) {
return this.paginateOptions(options);
}
return '';
}
renderDoneOrInstructions() {
if (this.done) {
const selected = this.value
.filter(e => e.selected)
.map(v => v.title)
.join(', ');
return selected;
}
const output = [color.gray(this.hint), this.renderInstructions()];
if (this.value[this.cursor].disabled) {
output.push(color.yellow(this.warn));
}
return output.join(' ');
}
render() {
if (this.closed) return;
if (this.firstRender) this.out.write(cursor.hide);
super.render();
// print prompt
let prompt = [
style.symbol(this.done, this.aborted),
color.bold(this.msg),
style.delimiter(false),
this.renderDoneOrInstructions()
].join(' ');
if (this.showMinError) {
prompt += color.red(`You must select a minimum of ${this.minSelected} choices.`);
this.showMinError = false;
}
prompt += this.renderOptions(this.value);
this.out.write(this.clear + prompt);
this.clear = clear(prompt);
}
}
module.exports = MultiselectPrompt;