ce4c83ff
 wxy
初始提交
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/**
* Sticky bottom bar user interface
*/
var util = require('util');
var through = require('through');
var Base = require('./baseUI');
var rlUtils = require('../utils/readline');
var _ = require('lodash');
/**
* Module exports
*/
module.exports = Prompt;
/**
* Constructor
*/
function Prompt(opt) {
opt || (opt = {});
Base.apply(this, arguments);
this.log = through(this.writeLog.bind(this));
this.bottomBar = opt.bottomBar || '';
this.render();
}
util.inherits(Prompt, Base);
/**
* Render the prompt to screen
* @return {Prompt} self
*/
Prompt.prototype.render = function () {
this.write(this.bottomBar);
return this;
};
Prompt.prototype.clean = function () {
rlUtils.clearLine(this.rl, this.bottomBar.split('\n').length);
return this;
};
/**
* Update the bottom bar content and rerender
* @param {String} bottomBar Bottom bar content
* @return {Prompt} self
*/
Prompt.prototype.updateBottomBar = function (bottomBar) {
rlUtils.clearLine(this.rl, 1);
this.rl.output.unmute();
this.clean();
this.bottomBar = bottomBar;
this.render();
this.rl.output.mute();
return this;
};
/**
* Write out log data
* @param {String} data - The log data to be output
* @return {Prompt} self
*/
Prompt.prototype.writeLog = function (data) {
this.rl.output.unmute();
this.clean();
this.rl.output.write(this.enforceLF(data.toString()));
this.render();
this.rl.output.mute();
return this;
};
/**
* Make sure line end on a line feed
* @param {String} str Input string
* @return {String} The input string with a final line feed
*/
Prompt.prototype.enforceLF = function (str) {
return str.match(/[\r\n]$/) ? str : str + '\n';
};
/**
* Helper for writing message in Prompt
* @param {Prompt} prompt - The Prompt object that extends tty
* @param {String} message - The message to be output
*/
Prompt.prototype.write = function (message) {
var msgLines = message.split(/\n/);
this.height = msgLines.length;
// Write message to screen and setPrompt to control backspace
this.rl.setPrompt(_.last(msgLines));
if (this.rl.output.rows === 0 && this.rl.output.columns === 0) {
/* When it's a tty through serial port there's no terminal info and the render will malfunction,
so we need enforce the cursor to locate to the leftmost position for rendering. */
rlUtils.left(this.rl, message.length + this.rl.line.length);
}
this.rl.output.write(message);
};
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