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autocomplete.js
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Mon, Feb 10, 21:15

autocomplete.js
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'use strict';
const color = require('kleur');
const Prompt = require('./prompt');
const { erase, cursor } = require('sisteransi');
const { style, clear, figures, wrap, entriesToDisplay } = require('../util');
const getVal = (arr, i) => arr[i] && (arr[i].value || arr[i].title || arr[i]);
const getTitle = (arr, i) => arr[i] && (arr[i].title || arr[i].value || arr[i]);
const getIndex = (arr, valOrTitle) => {
const index = arr.findIndex(el => el.value === valOrTitle || el.title === valOrTitle);
return index > -1 ? index : undefined;
};
/**
* TextPrompt Base Element
* @param {Object} opts Options
* @param {String} opts.message Message
* @param {Array} opts.choices Array of auto-complete choices objects
* @param {Function} [opts.suggest] Filter function. Defaults to sort by title
* @param {Number} [opts.limit=10] Max number of results to show
* @param {Number} [opts.cursor=0] Cursor start position
* @param {String} [opts.style='default'] Render style
* @param {String} [opts.fallback] Fallback message - initial to default value
* @param {String} [opts.initial] Index of the default value
* @param {Boolean} [opts.clearFirst] The first ESCAPE keypress will clear the input
* @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.noMatches] The no matches found label
*/
class AutocompletePrompt extends Prompt {
constructor(opts={}) {
super(opts);
this.msg = opts.message;
this.suggest = opts.suggest;
this.choices = opts.choices;
this.initial = typeof opts.initial === 'number'
? opts.initial
: getIndex(opts.choices, opts.initial);
this.select = this.initial || opts.cursor || 0;
this.i18n = { noMatches: opts.noMatches || 'no matches found' };
this.fallback = opts.fallback || this.initial;
this.clearFirst = opts.clearFirst || false;
this.suggestions = [];
this.input = '';
this.limit = opts.limit || 10;
this.cursor = 0;
this.transform = style.render(opts.style);
this.scale = this.transform.scale;
this.render = this.render.bind(this);
this.complete = this.complete.bind(this);
this.clear = clear('', this.out.columns);
this.complete(this.render);
this.render();
}
set fallback(fb) {
this._fb = Number.isSafeInteger(parseInt(fb)) ? parseInt(fb) : fb;
}
get fallback() {
let choice;
if (typeof this._fb === 'number')
choice = this.choices[this._fb];
else if (typeof this._fb === 'string')
choice = { title: this._fb };
return choice || this._fb || { title: this.i18n.noMatches };
}
moveSelect(i) {
this.select = i;
if (this.suggestions.length > 0)
this.value = getVal(this.suggestions, i);
else this.value = this.fallback.value;
this.fire();
}
async complete(cb) {
const p = (this.completing = this.suggest(this.input, this.choices));
const suggestions = await p;
if (this.completing !== p) return;
this.suggestions = suggestions
.map((s, i, arr) => ({ title: getTitle(arr, i), value: getVal(arr, i), description: s.description }));
this.completing = false;
const l = Math.max(suggestions.length - 1, 0);
this.moveSelect(Math.min(l, this.select));
cb && cb();
}
reset() {
this.input = '';
this.complete(() => {
this.moveSelect(this.initial !== void 0 ? this.initial : 0);
this.render();
});
this.render();
}
exit() {
if (this.clearFirst && this.input.length > 0) {
this.reset();
} else {
this.done = this.exited = true;
this.aborted = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
}
abort() {
this.done = this.aborted = true;
this.exited = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
submit() {
this.done = true;
this.aborted = this.exited = false;
this.fire();
this.render();
this.out.write('\n');
this.close();
}
_(c, key) {
let s1 = this.input.slice(0, this.cursor);
let s2 = this.input.slice(this.cursor);
this.input = `${s1}${c}${s2}`;
this.cursor = s1.length+1;
this.complete(this.render);
this.render();
}
delete() {
if (this.cursor === 0) return this.bell();
let s1 = this.input.slice(0, this.cursor-1);
let s2 = this.input.slice(this.cursor);
this.input = `${s1}${s2}`;
this.complete(this.render);
this.cursor = this.cursor-1;
this.render();
}
deleteForward() {
if(this.cursor*this.scale >= this.rendered.length) return this.bell();
let s1 = this.input.slice(0, this.cursor);
let s2 = this.input.slice(this.cursor+1);
this.input = `${s1}${s2}`;
this.complete(this.render);
this.render();
}
first() {
this.moveSelect(0);
this.render();
}
last() {
this.moveSelect(this.suggestions.length - 1);
this.render();
}
up() {
if (this.select === 0) {
this.moveSelect(this.suggestions.length - 1);
} else {
this.moveSelect(this.select - 1);
}
this.render();
}
down() {
if (this.select === this.suggestions.length - 1) {
this.moveSelect(0);
} else {
this.moveSelect(this.select + 1);
}
this.render();
}
next() {
if (this.select === this.suggestions.length - 1) {
this.moveSelect(0);
} else this.moveSelect(this.select + 1);
this.render();
}
nextPage() {
this.moveSelect(Math.min(this.select + this.limit, this.suggestions.length - 1));
this.render();
}
prevPage() {
this.moveSelect(Math.max(this.select - this.limit, 0));
this.render();
}
left() {
if (this.cursor <= 0) return this.bell();
this.cursor = this.cursor-1;
this.render();
}
right() {
if (this.cursor*this.scale >= this.rendered.length) return this.bell();
this.cursor = this.cursor+1;
this.render();
}
renderOption(v, hovered, isStart, isEnd) {
let desc;
let prefix = isStart ? figures.arrowUp : isEnd ? figures.arrowDown : ' ';
let title = hovered ? color.cyan().underline(v.title) : v.title;
prefix = (hovered ? color.cyan(figures.pointer) + ' ' : ' ') + prefix;
if (v.description) {
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 })
}
}
return prefix + ' ' + title + color.gray(desc || '');
}
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 { startIndex, endIndex } = entriesToDisplay(this.select, this.choices.length, this.limit);
this.outputText = [
style.symbol(this.done, this.aborted, this.exited),
color.bold(this.msg),
style.delimiter(this.completing),
this.done && this.suggestions[this.select]
? this.suggestions[this.select].title
: this.rendered = this.transform.render(this.input)
].join(' ');
if (!this.done) {
const suggestions = this.suggestions
.slice(startIndex, endIndex)
.map((item, i) => this.renderOption(item,
this.select === i + startIndex,
i === 0 && startIndex > 0,
i + startIndex === endIndex - 1 && endIndex < this.choices.length))
.join('\n');
this.outputText += `\n` + (suggestions || color.gray(this.fallback.title));
}
this.out.write(erase.line + cursor.to(0) + this.outputText);
}
}
module.exports = AutocompletePrompt;

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