Waybar/src/modules/memory.cpp

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#include "modules/memory.hpp"
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waybar::modules::Memory::Memory(const Json::Value& config)
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: ALabel(config, "{}%")
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{
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uint32_t interval = config_["interval"].isUInt() ? config_["interval"].asUInt() : 30;
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thread_ = [this, interval] {
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dp.emit();
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thread_.sleep_for(chrono::seconds(interval));
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};
}
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auto waybar::modules::Memory::update() -> void
{
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parseMeminfo();
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if (memtotal_ > 0 && memfree_ >= 0) {
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int used_ram_percentage = 100 * (memtotal_ - memfree_) / memtotal_;
label_.set_text(fmt::format(format_, used_ram_percentage));
auto used_ram_gigabytes = (memtotal_ - memfree_) / std::pow(1024, 2);
label_.set_tooltip_text(fmt::format("{:.{}f}Gb used", used_ram_gigabytes, 1));
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label_.set_name("memory");
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label_.show();
} else {
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label_.set_name("");
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label_.hide();
}
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}
void waybar::modules::Memory::parseMeminfo()
{
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long memfree = -1, membuffer = -1, memcache = -1, memavail = -1;
std::ifstream info(data_dir_);
if (!info.is_open()) {
throw std::runtime_error("Can't open " + data_dir_);
}
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std::string line;
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while (getline(info, line)) {
auto posDelim = line.find(":");
if (posDelim == std::string::npos) {
continue;
}
std::string name = line.substr(0, posDelim);
long value = std::stol(line.substr(posDelim + 1));
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if (name.compare("MemTotal") == 0) {
memtotal_ = value;
} else if (name.compare("MemAvailable") == 0) {
memavail = value;
} else if (name.compare("MemFree") == 0) {
memfree = value;
} else if (name.compare("Buffers") == 0) {
membuffer = value;
} else if (name.compare("Cached") == 0) {
memcache = value;
}
if (memtotal_ > 0 &&
(memavail >= 0 || (memfree > -1 && membuffer > -1 && memcache > -1))) {
break;
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}
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}
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memfree_ = memavail >= 0 ? memavail : memfree + membuffer + memcache;
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}