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'use strict';
var _ = require('lodash');
var MuteStream = require('mute-stream');
var readline = require('readline');
/**
* Base interface class other can inherits from
*/
var UI = module.exports = function (opt) {
// Instantiate the Readline interface
// @Note: Don't reassign if already present (allow test to override the Stream)
if (!this.rl) {
this.rl = readline.createInterface(setupReadlineOptions(opt));
}
this.rl.resume();
this.onForceClose = this.onForceClose.bind(this);
// Make sure new prompt start on a newline when closing
process.on('exit', this.onForceClose);
// Terminate process on SIGINT (which will call process.on('exit') in return)
this.rl.on('SIGINT', this.onForceClose);
};
/**
* Handle the ^C exit
* @return {null}
*/
UI.prototype.onForceClose = function () {
this.close();
process.kill(process.pid, 'SIGINT');
console.log('');
};
/**
* Close the interface and cleanup listeners
*/
UI.prototype.close = function () {
// Remove events listeners
this.rl.removeListener('SIGINT', this.onForceClose);
process.removeListener('exit', this.onForceClose);
this.rl.output.unmute();
if (this.activePrompt && typeof this.activePrompt.close === 'function') {
this.activePrompt.close();
}
// Close the readline
this.rl.output.end();
this.rl.pause();
this.rl.close();
};
function setupReadlineOptions(opt) {
opt = opt || {};
// Default `input` to stdin
var input = opt.input || process.stdin;
// Add mute capabilities to the output
var ms = new MuteStream();
ms.pipe(opt.output || process.stdout);
var output = ms;
return _.extend({
terminal: true,
input: input,
output: output
}, _.omit(opt, ['input', 'output']));
}
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