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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 20:01:36 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 20:01:36 +0000 |
commit | 62e4c68907d8d33709c2c1f92a161dff00b3d5f2 (patch) | |
tree | adbbaf3acf88ea08f6eeec4b75ee98ad3b07fbdc /src/base/humanize.cc | |
parent | Initial commit. (diff) | |
download | lnav-62e4c68907d8d33709c2c1f92a161dff00b3d5f2.tar.xz lnav-62e4c68907d8d33709c2c1f92a161dff00b3d5f2.zip |
Adding upstream version 0.11.2.upstream/0.11.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/base/humanize.cc')
-rw-r--r-- | src/base/humanize.cc | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/base/humanize.cc b/src/base/humanize.cc new file mode 100644 index 0000000..5e96bf3 --- /dev/null +++ b/src/base/humanize.cc @@ -0,0 +1,110 @@ +/** + * Copyright (c) 2019, Timothy Stack + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * * Neither the name of Timothy Stack nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <cmath> +#include <vector> + +#include "humanize.hh" + +#include "config.h" +#include "fmt/format.h" + +namespace humanize { + +std::string +file_size(file_ssize_t value, alignment align) +{ + static const double LN1024 = log(1024.0); + static const std::vector<const char*> UNITS = { + " ", + "K", + "M", + "G", + "T", + "P", + "E", + }; + + if (value < 0) { + return "Unknown"; + } + + if (value == 0) { + switch (align) { + case alignment::none: + return "0B"; + case alignment::columnar: + return "0.0 B"; + } + } + + auto exp + = floor(std::min(log(value) / LN1024, (double) (UNITS.size() - 1))); + auto divisor = pow(1024, exp); + + if (align == alignment::none && divisor <= 1) { + return fmt::format(FMT_STRING("{}B"), value, UNITS[exp]); + } + return fmt::format(FMT_STRING("{:.1f}{}B"), + divisor == 0 ? value : value / divisor, + UNITS[exp]); +} + +const std::string& +sparkline(double value, nonstd::optional<double> upper_opt) +{ + static const std::string ZERO = " "; + static const std::string BARS[] = { + "\u2581", + "\u2582", + "\u2583", + "\u2584", + "\u2585", + "\u2586", + "\u2587", + "\u2588", + }; + static const double BARS_COUNT = std::distance(begin(BARS), end(BARS)); + + if (value <= 0.0) { + return ZERO; + } + + auto upper = upper_opt.value_or(100.0); + + if (value >= upper) { + return BARS[(size_t) BARS_COUNT - 1]; + } + + size_t index = ceil((value / upper) * BARS_COUNT) - 1; + + return BARS[index]; +} + +} // namespace humanize |