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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label_.set_name("memory");
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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();
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));
}
void waybar::modules::Memory::parseMeminfo()
{
int memtotal, memfree, memavail, membuffer, memcache;
FILE* info = fopen("/proc/meminfo","r");
if(fscanf (info, "MemTotal: %d kB MemFree: %d kB Buffers: %d kB Cached: %d kB",&memtotal, &memfree, &membuffer, &memcache) < 4) { // Old meminfo format
rewind(info);
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if(fscanf(info, "MemTotal: %d kB MemFree: %d kB MemAvailable: %d kB Buffers: %d kB Cached: %d kB",&memtotal, &memfree, &memavail, &membuffer, &memcache) < 5) { // Current meminfo format
memtotal_ = -1;
memfree_ = -1;
} else {
memtotal_ = memtotal;
memfree_ = memavail;
}
} else {
memtotal_ = memtotal;
memfree_ = memfree + (membuffer + memcache);
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}
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fclose(info);
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}