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/*!
* node-progress
* Copyright(c) 2011 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Expose `ProgressBar`.
*/
exports = module.exports = ProgressBar;
/**
* Initialize a `ProgressBar` with the given `fmt` string and `options` or
* `total`.
*
* Options:
*
* - `curr` current completed index
* - `total` total number of ticks to complete
* - `width` the displayed width of the progress bar defaulting to total
* - `stream` the output stream defaulting to stderr
* - `head` head character defaulting to complete character
* - `complete` completion character defaulting to "="
* - `incomplete` incomplete character defaulting to "-"
* - `renderThrottle` minimum time between updates in milliseconds defaulting to 16
* - `callback` optional function to call when the progress bar completes
* - `clear` will clear the progress bar upon termination
*
* Tokens:
*
* - `:bar` the progress bar itself
* - `:current` current tick number
* - `:total` total ticks
* - `:elapsed` time elapsed in seconds
* - `:percent` completion percentage
* - `:eta` eta in seconds
* - `:rate` rate of ticks per second
*
* @param {string} fmt
* @param {object|number} options or total
* @api public
*/
function ProgressBar(fmt, options) {
this.stream = options.stream || process.stderr;
if (typeof(options) == 'number') {
var total = options;
options = {};
options.total = total;
} else {
options = options || {};
if ('string' != typeof fmt) throw new Error('format required');
if ('number' != typeof options.total) throw new Error('total required');
}
this.fmt = fmt;
this.curr = options.curr || 0;
this.total = options.total;
this.width = options.width || this.total;
this.clear = options.clear
this.chars = {
complete : options.complete || '=',
incomplete : options.incomplete || '-',
head : options.head || (options.complete || '=')
};
this.renderThrottle = options.renderThrottle !== 0 ? (options.renderThrottle || 16) : 0;
this.lastRender = -Infinity;
this.callback = options.callback || function () {};
this.tokens = {};
this.lastDraw = '';
}
/**
* "tick" the progress bar with optional `len` and optional `tokens`.
*
* @param {number|object} len or tokens
* @param {object} tokens
* @api public
*/
ProgressBar.prototype.tick = function(len, tokens){
if (len !== 0)
len = len || 1;
// swap tokens
if ('object' == typeof len) tokens = len, len = 1;
if (tokens) this.tokens = tokens;
// start time for eta
if (0 == this.curr) this.start = new Date;
this.curr += len
// try to render
this.render();
// progress complete
if (this.curr >= this.total) {
this.render(undefined, true);
this.complete = true;
this.terminate();
this.callback(this);
return;
}
};
/**
* Method to render the progress bar with optional `tokens` to place in the
* progress bar's `fmt` field.
*
* @param {object} tokens
* @api public
*/
ProgressBar.prototype.render = function (tokens, force) {
force = force !== undefined ? force : false;
if (tokens) this.tokens = tokens;
if (!this.stream.isTTY) return;
var now = Date.now();
var delta = now - this.lastRender;
if (!force && (delta < this.renderThrottle)) {
return;
} else {
this.lastRender = now;
}
var ratio = this.curr / this.total;
ratio = Math.min(Math.max(ratio, 0), 1);
var percent = Math.floor(ratio * 100);
var incomplete, complete, completeLength;
var elapsed = new Date - this.start;
var eta = (percent == 100) ? 0 : elapsed * (this.total / this.curr - 1);
var rate = this.curr / (elapsed / 1000);
/* populate the bar template with percentages and timestamps */
var str = this.fmt
.replace(':current', this.curr)
.replace(':total', this.total)
.replace(':elapsed', isNaN(elapsed) ? '0.0' : (elapsed / 1000).toFixed(1))
.replace(':eta', (isNaN(eta) || !isFinite(eta)) ? '0.0' : (eta / 1000)
.toFixed(1))
.replace(':percent', percent.toFixed(0) + '%')
.replace(':rate', Math.round(rate));
/* compute the available space (non-zero) for the bar */
var availableSpace = Math.max(0, this.stream.columns - str.replace(':bar', '').length);
if(availableSpace && process.platform === 'win32'){
availableSpace = availableSpace - 1;
}
var width = Math.min(this.width, availableSpace);
/* TODO: the following assumes the user has one ':bar' token */
completeLength = Math.round(width * ratio);
complete = Array(Math.max(0, completeLength + 1)).join(this.chars.complete);
incomplete = Array(Math.max(0, width - completeLength + 1)).join(this.chars.incomplete);
/* add head to the complete string */
if(completeLength > 0)
complete = complete.slice(0, -1) + this.chars.head;
/* fill in the actual progress bar */
str = str.replace(':bar', complete + incomplete);
/* replace the extra tokens */
if (this.tokens) for (var key in this.tokens) str = str.replace(':' + key, this.tokens[key]);
if (this.lastDraw !== str) {
this.stream.cursorTo(0);
this.stream.write(str);
this.stream.clearLine(1);
this.lastDraw = str;
}
};
/**
* "update" the progress bar to represent an exact percentage.
* The ratio (between 0 and 1) specified will be multiplied by `total` and
* floored, representing the closest available "tick." For example, if a
* progress bar has a length of 3 and `update(0.5)` is called, the progress
* will be set to 1.
*
* A ratio of 0.5 will attempt to set the progress to halfway.
*
* @param {number} ratio The ratio (between 0 and 1 inclusive) to set the
* overall completion to.
* @api public
*/
ProgressBar.prototype.update = function (ratio, tokens) {
var goal = Math.floor(ratio * this.total);
var delta = goal - this.curr;
this.tick(delta, tokens);
};
/**
* "interrupt" the progress bar and write a message above it.
* @param {string} message The message to write.
* @api public
*/
ProgressBar.prototype.interrupt = function (message) {
// clear the current line
this.stream.clearLine();
// move the cursor to the start of the line
this.stream.cursorTo(0);
// write the message text
this.stream.write(message);
// terminate the line after writing the message
this.stream.write('\n');
// re-display the progress bar with its lastDraw
this.stream.write(this.lastDraw);
};
/**
* Terminates a progress bar.
*
* @api public
*/
ProgressBar.prototype.terminate = function () {
if (this.clear) {
if (this.stream.clearLine) {
this.stream.clearLine();
this.stream.cursorTo(0);
}
} else {
this.stream.write('\n');
}
};