const color = require('kleur'); const Prompt = require('./prompt'); const { erase, cursor } = require('sisteransi'); const { style, clear, lines, figures } = require('../util'); /** * TextPrompt Base Element * @param {Object} opts Options * @param {String} opts.message Message * @param {String} [opts.style='default'] Render style * @param {String} [opts.initial] Default value * @param {Function} [opts.validate] Validate function * @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.error] The invalid error label */ class TextPrompt extends Prompt { constructor(opts={}) { super(opts); this.transform = style.render(opts.style); this.scale = this.transform.scale; this.msg = opts.message; this.initial = opts.initial || ``; this.validator = opts.validate || (() => true); this.value = ``; this.errorMsg = opts.error || `Please Enter A Valid Value`; this.cursor = Number(!!this.initial); this.cursorOffset = 0; this.clear = clear(``, this.out.columns); this.render(); } set value(v) { if (!v && this.initial) { this.placeholder = true; this.rendered = color.gray(this.transform.render(this.initial)); } else { this.placeholder = false; this.rendered = this.transform.render(v); } this._value = v; this.fire(); } get value() { return this._value; } reset() { this.value = ``; this.cursor = Number(!!this.initial); this.cursorOffset = 0; this.fire(); this.render(); } exit() { this.abort(); } abort() { this.value = this.value || this.initial; this.done = this.aborted = true; this.error = false; this.red = false; this.fire(); this.render(); this.out.write('\n'); this.close(); } async validate() { let valid = await this.validator(this.value); if (typeof valid === `string`) { this.errorMsg = valid; valid = false; } this.error = !valid; } async submit() { this.value = this.value || this.initial; this.cursorOffset = 0; this.cursor = this.rendered.length; await this.validate(); if (this.error) { this.red = true; this.fire(); this.render(); return; } this.done = true; this.aborted = false; this.fire(); this.render(); this.out.write('\n'); this.close(); } next() { if (!this.placeholder) return this.bell(); this.value = this.initial; this.cursor = this.rendered.length; this.fire(); this.render(); } moveCursor(n) { if (this.placeholder) return; this.cursor = this.cursor+n; this.cursorOffset += n; } _(c, key) { let s1 = this.value.slice(0, this.cursor); let s2 = this.value.slice(this.cursor); this.value = `${s1}${c}${s2}`; this.red = false; this.cursor = this.placeholder ? 0 : s1.length+1; this.render(); } delete() { if (this.isCursorAtStart()) return this.bell(); let s1 = this.value.slice(0, this.cursor-1); let s2 = this.value.slice(this.cursor); this.value = `${s1}${s2}`; this.red = false; if (this.isCursorAtStart()) { this.cursorOffset = 0 } else { this.cursorOffset++; this.moveCursor(-1); } this.render(); } deleteForward() { if(this.cursor*this.scale >= this.rendered.length || this.placeholder) return this.bell(); let s1 = this.value.slice(0, this.cursor); let s2 = this.value.slice(this.cursor+1); this.value = `${s1}${s2}`; this.red = false; if (this.isCursorAtEnd()) { this.cursorOffset = 0; } else { this.cursorOffset++; } this.render(); } first() { this.cursor = 0; this.render(); } last() { this.cursor = this.value.length; this.render(); } left() { if (this.cursor <= 0 || this.placeholder) return this.bell(); this.moveCursor(-1); this.render(); } right() { if (this.cursor*this.scale >= this.rendered.length || this.placeholder) return this.bell(); this.moveCursor(1); this.render(); } isCursorAtStart() { return this.cursor === 0 || (this.placeholder && this.cursor === 1); } isCursorAtEnd() { return this.cursor === this.rendered.length || (this.placeholder && this.cursor === this.rendered.length + 1) } render() { if (this.closed) return; if (!this.firstRender) { if (this.outputError) this.out.write(cursor.down(lines(this.outputError, this.out.columns) - 1) + clear(this.outputError, this.out.columns)); this.out.write(clear(this.outputText, this.out.columns)); } super.render(); this.outputError = ''; this.outputText = [ style.symbol(this.done, this.aborted), color.bold(this.msg), style.delimiter(this.done), this.red ? color.red(this.rendered) : this.rendered ].join(` `); if (this.error) { this.outputError += this.errorMsg.split(`\n`) .reduce((a, l, i) => a + `\n${i ? ' ' : figures.pointerSmall} ${color.red().italic(l)}`, ``); } this.out.write(erase.line + cursor.to(0) + this.outputText + cursor.save + this.outputError + cursor.restore + cursor.move(this.cursorOffset, 0)); } } module.exports = TextPrompt;