mirror of
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1ada95e04a
- Convert project to Javascript/Typescript - Allow custom headers to be passed in (optional) - Allow body to be optional
236 lines
6.5 KiB
JavaScript
236 lines
6.5 KiB
JavaScript
/*!
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* node-progress
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* Copyright(c) 2011 TJ Holowaychuk <tj@vision-media.ca>
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* MIT Licensed
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*/
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/**
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* Expose `ProgressBar`.
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*/
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exports = module.exports = ProgressBar;
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/**
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* Initialize a `ProgressBar` with the given `fmt` string and `options` or
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* `total`.
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*
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* Options:
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*
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* - `curr` current completed index
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* - `total` total number of ticks to complete
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* - `width` the displayed width of the progress bar defaulting to total
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* - `stream` the output stream defaulting to stderr
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* - `head` head character defaulting to complete character
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* - `complete` completion character defaulting to "="
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* - `incomplete` incomplete character defaulting to "-"
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* - `renderThrottle` minimum time between updates in milliseconds defaulting to 16
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* - `callback` optional function to call when the progress bar completes
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* - `clear` will clear the progress bar upon termination
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*
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* Tokens:
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*
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* - `:bar` the progress bar itself
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* - `:current` current tick number
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* - `:total` total ticks
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* - `:elapsed` time elapsed in seconds
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* - `:percent` completion percentage
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* - `:eta` eta in seconds
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* - `:rate` rate of ticks per second
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*
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* @param {string} fmt
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* @param {object|number} options or total
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* @api public
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*/
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function ProgressBar(fmt, options) {
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this.stream = options.stream || process.stderr;
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if (typeof(options) == 'number') {
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var total = options;
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options = {};
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options.total = total;
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} else {
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options = options || {};
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if ('string' != typeof fmt) throw new Error('format required');
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if ('number' != typeof options.total) throw new Error('total required');
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}
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this.fmt = fmt;
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this.curr = options.curr || 0;
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this.total = options.total;
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this.width = options.width || this.total;
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this.clear = options.clear
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this.chars = {
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complete : options.complete || '=',
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incomplete : options.incomplete || '-',
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head : options.head || (options.complete || '=')
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};
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this.renderThrottle = options.renderThrottle !== 0 ? (options.renderThrottle || 16) : 0;
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this.lastRender = -Infinity;
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this.callback = options.callback || function () {};
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this.tokens = {};
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this.lastDraw = '';
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}
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/**
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* "tick" the progress bar with optional `len` and optional `tokens`.
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*
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* @param {number|object} len or tokens
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* @param {object} tokens
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* @api public
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*/
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ProgressBar.prototype.tick = function(len, tokens){
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if (len !== 0)
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len = len || 1;
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// swap tokens
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if ('object' == typeof len) tokens = len, len = 1;
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if (tokens) this.tokens = tokens;
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// start time for eta
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if (0 == this.curr) this.start = new Date;
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this.curr += len
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// try to render
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this.render();
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// progress complete
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if (this.curr >= this.total) {
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this.render(undefined, true);
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this.complete = true;
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this.terminate();
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this.callback(this);
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return;
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}
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};
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/**
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* Method to render the progress bar with optional `tokens` to place in the
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* progress bar's `fmt` field.
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*
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* @param {object} tokens
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* @api public
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*/
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ProgressBar.prototype.render = function (tokens, force) {
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force = force !== undefined ? force : false;
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if (tokens) this.tokens = tokens;
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if (!this.stream.isTTY) return;
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var now = Date.now();
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var delta = now - this.lastRender;
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if (!force && (delta < this.renderThrottle)) {
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return;
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} else {
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this.lastRender = now;
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}
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var ratio = this.curr / this.total;
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ratio = Math.min(Math.max(ratio, 0), 1);
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var percent = Math.floor(ratio * 100);
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var incomplete, complete, completeLength;
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var elapsed = new Date - this.start;
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var eta = (percent == 100) ? 0 : elapsed * (this.total / this.curr - 1);
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var rate = this.curr / (elapsed / 1000);
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/* populate the bar template with percentages and timestamps */
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var str = this.fmt
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.replace(':current', this.curr)
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.replace(':total', this.total)
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.replace(':elapsed', isNaN(elapsed) ? '0.0' : (elapsed / 1000).toFixed(1))
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.replace(':eta', (isNaN(eta) || !isFinite(eta)) ? '0.0' : (eta / 1000)
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.toFixed(1))
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.replace(':percent', percent.toFixed(0) + '%')
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.replace(':rate', Math.round(rate));
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/* compute the available space (non-zero) for the bar */
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var availableSpace = Math.max(0, this.stream.columns - str.replace(':bar', '').length);
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if(availableSpace && process.platform === 'win32'){
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availableSpace = availableSpace - 1;
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}
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var width = Math.min(this.width, availableSpace);
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/* TODO: the following assumes the user has one ':bar' token */
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completeLength = Math.round(width * ratio);
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complete = Array(Math.max(0, completeLength + 1)).join(this.chars.complete);
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incomplete = Array(Math.max(0, width - completeLength + 1)).join(this.chars.incomplete);
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/* add head to the complete string */
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if(completeLength > 0)
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complete = complete.slice(0, -1) + this.chars.head;
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/* fill in the actual progress bar */
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str = str.replace(':bar', complete + incomplete);
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/* replace the extra tokens */
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if (this.tokens) for (var key in this.tokens) str = str.replace(':' + key, this.tokens[key]);
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if (this.lastDraw !== str) {
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this.stream.cursorTo(0);
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this.stream.write(str);
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this.stream.clearLine(1);
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this.lastDraw = str;
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}
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};
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/**
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* "update" the progress bar to represent an exact percentage.
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* The ratio (between 0 and 1) specified will be multiplied by `total` and
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* floored, representing the closest available "tick." For example, if a
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* progress bar has a length of 3 and `update(0.5)` is called, the progress
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* will be set to 1.
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*
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* A ratio of 0.5 will attempt to set the progress to halfway.
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*
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* @param {number} ratio The ratio (between 0 and 1 inclusive) to set the
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* overall completion to.
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* @api public
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*/
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ProgressBar.prototype.update = function (ratio, tokens) {
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var goal = Math.floor(ratio * this.total);
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var delta = goal - this.curr;
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this.tick(delta, tokens);
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};
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/**
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* "interrupt" the progress bar and write a message above it.
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* @param {string} message The message to write.
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* @api public
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*/
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ProgressBar.prototype.interrupt = function (message) {
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// clear the current line
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this.stream.clearLine();
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// move the cursor to the start of the line
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this.stream.cursorTo(0);
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// write the message text
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this.stream.write(message);
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// terminate the line after writing the message
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this.stream.write('\n');
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// re-display the progress bar with its lastDraw
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this.stream.write(this.lastDraw);
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};
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/**
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* Terminates a progress bar.
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*
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* @api public
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*/
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ProgressBar.prototype.terminate = function () {
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if (this.clear) {
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if (this.stream.clearLine) {
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this.stream.clearLine();
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this.stream.cursorTo(0);
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}
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} else {
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this.stream.write('\n');
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}
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};
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