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custom formatter for numbers in 'pow' units format

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Guillaume Maudoux
2019-09-24 11:21:28 +02:00
parent 211b1c2785
commit f4d2ca2736
5 changed files with 105 additions and 39 deletions
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26
src/util/format.cpp
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@ -1,26 +0,0 @@
#include <sstream>
namespace waybar::util {
std::string pow_format(unsigned long long value, const std::string &unit, bool binary = false) {
auto base = binary ? 1024ull : 1000ull;
const char* units[] = { "", "k", "M", "G", "T", "P", nullptr};
auto fraction = (double) value;
int pow;
for (pow = 0; units[pow+1] != nullptr && fraction / base >= 2; ++pow) {
fraction /= base;
}
std::ostringstream ss;
if (pow > 0) {
auto quotient = (unsigned long long) fraction;
auto remainder = (unsigned long long) ((fraction - quotient) * 10);
ss << quotient << "." << remainder << units[pow] << (binary ? "i" : "") << unit;
} else {
ss << value << unit;
}
return ss.str();
};
}