Initial commit

.gitignore

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+build

Makefile

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+build/batstat:src/*.cc
+	g++ -o build/batstat src/*.cc -Iinclude
+clean:
+	rm build/batstat

include/batteryinfo.h

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+#pragma once
+
+#include <filesystem>
+#include <string>
+
+namespace dlore
+{
+	struct
+	{
+		std::string Manufacturer;
+		std::string Model;
+		std::string Technology;
+		unsigned int CellSeriesCount;
+		unsigned int Capacity;
+		float Vnow;
+		float Vmin;
+		unsigned int ChargeNow;
+		unsigned int ChargeFull;
+		unsigned int ChargeFullDesign;
+	} typedef BatteryInfo;
+
+	BatteryInfo GetBatteryInfo(std::filesystem::path classPath);
+}

src/batteryinfo.cc

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+#include <batteryinfo.h>
+#include <fstream>
+#include <cmath>
+
+namespace dlore
+{
+	std::string readData(std::filesystem::path path)
+	{
+		std::ifstream file(path, std::ios::in);
+		if(!file) return "";
+		std::string ret;
+		std::getline(file, ret);
+		file.close();
+		return ret;
+	}
+
+	BatteryInfo GetBatteryInfo(std::filesystem::path classPath)
+	{
+		BatteryInfo info;
+		info.Manufacturer = readData(classPath / "manufacturer");
+		info.Model = readData(classPath / "model_name");
+		info.Technology = readData(classPath / "technology");
+
+		info.Capacity = std::stoi(readData(classPath / "capacity"));
+		info.ChargeNow = std::stoi(readData(classPath / "charge_now")) / 1000;
+		info.ChargeFull = std::stoi(readData(classPath / "charge_full")) / 1000;
+		info.ChargeFullDesign = std::stoi(readData(classPath / "charge_full_design")) / 1000;
+
+		int Vnow = std::stoi(readData(classPath / "voltage_now")) / 1000;
+		int Vmin = std::stoi(readData(classPath / "voltage_min_design")) / 1000;
+
+		info.Vnow = Vnow / 1000.0f;
+		info.Vmin = Vmin / 1000.0f;
+
+		info.CellSeriesCount = std::ceil(info.Vmin / 3.7f);
+		// LiPo and Li-Ion cells operate at 3.7V (with the exception of LiFePO4 cells, which operate
+		//                                        at 3.3V but are not used in laptops due to low voltage and charge)
+
+		return info;
+	}
+}

src/main.cc

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+#include <iostream>
+#include <fstream>
+#include <string>
+#include <filesystem>
+#include <iomanip>
+
+#include <batteryinfo.h>
+
+void printBattery(std::filesystem::path classPath)
+{
+	dlore::BatteryInfo bat = dlore::GetBatteryInfo(classPath);
+
+	std::cout << std::fixed << std::setprecision(2);
+
+	std::cout << "Battery " << bat.Manufacturer << bat.Model; // manufacturer has a trailing whitespace, so no additional space necessary
+	std::cout << std::endl << "\tTechnology:           " << bat.Technology;
+	std::cout << std::endl << "\tCell series count:    " << bat.CellSeriesCount << 's' << std::endl;
+	std::cout << std::endl << "\tCapacity:             " << bat.Capacity << '%';
+	std::cout << std::endl << "\tVmin:                 " << bat.Vmin << 'V';
+	std::cout << "  Per cell: " << bat.Vmin / bat.CellSeriesCount << 'V';
+	std::cout << std::endl << "\tVnow:                 " << bat.Vnow << 'V';
+	std::cout << "  Per cell: " << bat.Vnow / bat.CellSeriesCount << 'V';
+	std::cout << std::endl << "\tCharge now:           " << bat.ChargeNow << "mAh";
+	std::cout << std::endl << "\tCharge full:          " << bat.ChargeFull << "mAh";
+	std::cout << std::endl << "\tCharge full (design): " << bat.ChargeFullDesign << "mAh" << std::endl;
+}
+
+int main(int argc, const char** argv)
+{
+	for(const std::filesystem::directory_entry& entry : std::filesystem::directory_iterator("/sys/class/power_supply"))
+	{
+		std::filesystem::path path = entry.path();
+		if(path.filename().string().find("BAT") == std::string::npos) continue; // filename does not contain BAT, continue
+		printBattery(path);
+	}
+	return 0;
+}