73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
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#include "ProgressBar.h"
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#include <algorithm>
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#include <future>
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#include <chrono>
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#include <format.h>
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#include <iostream>
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using std::string;
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ProgressBar::ProgressBar() {
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updateLoopFuture = std::async(std::launch::async, &ProgressBar::updateLoop, this);
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}
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ProgressBar::~ProgressBar() {
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done = true;
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updateLoopFuture.wait();
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}
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void ProgressBar::reportProgress(double value) {
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// Make sure value is in [0..1] range
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value = std::max(0.0, std::min(1.0, value));
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currentProgress = value;
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}
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void ProgressBar::updateLoop() {
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const int blockCount = 20;
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const std::chrono::milliseconds animationInterval(1000 / 8);
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const string animation = "|/-\\";
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while (!done) {
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int progressBlockCount = static_cast<int>(currentProgress * blockCount);
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int percent = static_cast<int>(currentProgress * 100);
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string text = fmt::format("[{0}{1}] {2:3}% {3}",
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string(progressBlockCount, '#'), string(blockCount - progressBlockCount, '-'),
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percent,
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animation[animationIndex++ % animation.size()]);
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updateText(text);
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std::this_thread::sleep_for(animationInterval);
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}
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updateText("");
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}
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void ProgressBar::updateText(const string& text) {
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// Get length of common portion
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int commonPrefixLength = 0;
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int commonLength = std::min(currentText.size(), text.size());
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while (commonPrefixLength < commonLength && text[commonPrefixLength] == currentText[commonPrefixLength]) {
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commonPrefixLength++;
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}
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// Construct output string
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string output;
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// ... backtrack to the first differing character
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output.append(currentText.size() - commonPrefixLength, '\b');
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// ... add new suffix
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output.append(text, commonPrefixLength, text.size() - commonPrefixLength);
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// ... if the new text is shorter than the old one: delete overlapping characters
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int overlapCount = currentText.size() - text.size();
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if (overlapCount > 0) {
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output.append(overlapCount, ' ');
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output.append(overlapCount, '\b');
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}
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std::cerr << output;
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currentText = text;
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}
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