100 lines
2.3 KiB
JavaScript
100 lines
2.3 KiB
JavaScript
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'use strict';
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const _ = {
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extend: require('lodash/extend'),
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omit: require('lodash/omit'),
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};
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const MuteStream = require('mute-stream');
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const readline = require('readline');
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/**
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* Base interface class other can inherits from
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*/
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class UI {
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constructor(opt) {
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// Instantiate the Readline interface
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// @Note: Don't reassign if already present (allow test to override the Stream)
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if (!this.rl) {
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this.rl = readline.createInterface(setupReadlineOptions(opt));
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}
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this.rl.resume();
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this.onForceClose = this.onForceClose.bind(this);
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// Make sure new prompt start on a newline when closing
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process.on('exit', this.onForceClose);
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// Terminate process on SIGINT (which will call process.on('exit') in return)
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this.rl.on('SIGINT', this.onForceClose);
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}
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/**
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* Handle the ^C exit
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* @return {null}
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*/
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onForceClose() {
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this.close();
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process.kill(process.pid, 'SIGINT');
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console.log('');
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}
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/**
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* Close the interface and cleanup listeners
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*/
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close() {
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// Remove events listeners
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this.rl.removeListener('SIGINT', this.onForceClose);
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process.removeListener('exit', this.onForceClose);
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this.rl.output.unmute();
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if (this.activePrompt && typeof this.activePrompt.close === 'function') {
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this.activePrompt.close();
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}
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// Close the readline
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this.rl.output.end();
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this.rl.pause();
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this.rl.close();
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}
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}
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function setupReadlineOptions(opt) {
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opt = opt || {};
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// Inquirer 8.x:
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// opt.skipTTYChecks = opt.skipTTYChecks === undefined ? opt.input !== undefined : opt.skipTTYChecks;
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opt.skipTTYChecks = opt.skipTTYChecks === undefined ? true : opt.skipTTYChecks;
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// Default `input` to stdin
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const input = opt.input || process.stdin;
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// Check if prompt is being called in TTY environment
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// If it isn't return a failed promise
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if (!opt.skipTTYChecks && !input.isTTY) {
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const nonTtyError = new Error(
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'Prompts can not be meaningfully rendered in non-TTY environments'
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);
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nonTtyError.isTtyError = true;
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throw nonTtyError;
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}
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// Add mute capabilities to the output
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const ms = new MuteStream();
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ms.pipe(opt.output || process.stdout);
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const output = ms;
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return _.extend(
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{
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terminal: true,
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input,
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output,
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},
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_.omit(opt, ['input', 'output'])
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);
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}
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module.exports = UI;
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