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autocompleteMultiselect.js
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Wed, Feb 19, 03:21

autocompleteMultiselect.js
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'use strict';
const color = require('kleur');
const { cursor } = require('sisteransi');
const MultiselectPrompt = require('./multiselect');
const { clear, style, figures } = 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 AutocompleteMultiselectPrompt extends MultiselectPrompt {
constructor(opts={}) {
opts.overrideRender = true;
super(opts);
this.inputValue = '';
this.clear = clear('', this.out.columns);
this.filteredOptions = this.value;
this.render();
}
last() {
this.cursor = this.filteredOptions.length - 1;
this.render();
}
next() {
this.cursor = (this.cursor + 1) % this.filteredOptions.length;
this.render();
}
up() {
if (this.cursor === 0) {
this.cursor = this.filteredOptions.length - 1;
} else {
this.cursor--;
}
this.render();
}
down() {
if (this.cursor === this.filteredOptions.length - 1) {
this.cursor = 0;
} else {
this.cursor++;
}
this.render();
}
left() {
this.filteredOptions[this.cursor].selected = false;
this.render();
}
right() {
if (this.value.filter(e => e.selected).length >= this.maxChoices) return this.bell();
this.filteredOptions[this.cursor].selected = true;
this.render();
}
delete() {
if (this.inputValue.length) {
this.inputValue = this.inputValue.substr(0, this.inputValue.length - 1);
this.updateFilteredOptions();
}
}
updateFilteredOptions() {
const currentHighlight = this.filteredOptions[this.cursor];
this.filteredOptions = this.value
.filter(v => {
if (this.inputValue) {
if (typeof v.title === 'string') {
if (v.title.toLowerCase().includes(this.inputValue.toLowerCase())) {
return true;
}
}
if (typeof v.value === 'string') {
if (v.value.toLowerCase().includes(this.inputValue.toLowerCase())) {
return true;
}
}
return false;
}
return true;
});
const newHighlightIndex = this.filteredOptions.findIndex(v => v === currentHighlight)
this.cursor = newHighlightIndex < 0 ? 0 : newHighlightIndex;
this.render();
}
handleSpaceToggle() {
const v = this.filteredOptions[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();
}
}
handleInputChange(c) {
this.inputValue = this.inputValue + c;
this.updateFilteredOptions();
}
_(c, key) {
if (c === ' ') {
this.handleSpaceToggle();
} else {
this.handleInputChange(c);
}
}
renderInstructions() {
if (this.instructions === undefined || this.instructions) {
if (typeof this.instructions === 'string') {
return this.instructions;
}
return `
Instructions:
${figures.arrowUp}/${figures.arrowDown}: Highlight option
${figures.arrowLeft}/${figures.arrowRight}/[space]: Toggle selection
[a,b,c]/delete: Filter choices
enter/return: Complete answer
`;
}
return '';
}
renderCurrentInput() {
return `
Filtered results for: ${this.inputValue ? this.inputValue : color.gray('Enter something to filter')}\n`;
}
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
}
renderDoneOrInstructions() {
if (this.done) {
return this.value
.filter(e => e.selected)
.map(v => v.title)
.join(', ');
}
const output = [color.gray(this.hint), this.renderInstructions(), this.renderCurrentInput()];
if (this.filteredOptions.length && this.filteredOptions[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.filteredOptions);
this.out.write(this.clear + prompt);
this.clear = clear(prompt, this.out.columns);
}
}
module.exports = AutocompleteMultiselectPrompt;

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