pixwhile/file.h

#pragma once

#include <cstdio>
#include <string>

#include "misc.h"

static void try_close(FILE* file);

class File {
public:
    // https://stackoverflow.com/a/2173764
    File(const File&) = delete;
    File& operator=(const File&) = delete;

    inline File(File&& other) {
        try_close(this->_file);
        this->_file = other._file;
        other._file = nullptr;
    }
    inline File& operator=(File&& other) {
        if (this == &other) {
            return *this;
        }

        try_close(this->_file);
        this->_file = other._file;
        other._file = nullptr;

        return *this;
    }

    File(const char* __restrict path, const char* __restrict mode) {
        using namespace std::string_literals;

        this->_file = fopen(path, mode);
        if (!this->_file) {
            throw_system_error("fopen("s + quote(path) + ')');
        }
    }
    ~File() {
        try_close(this->_file);
    }

    void write(const char* data, size_t length) {
        if (fwrite(data, 1, length, this->_file) != length) {
            throw_system_error("fwrite()");
        }
    }
    inline void write(const std::string& str) {
        this->write(str.data(), str.size());
    }
    inline constexpr FILE* get() const noexcept {
        return this->_file;
    }

protected:
    FILE* _file = nullptr;
};

static void try_close(FILE* file) {
    if (file && fclose(file)) {
        perror("Failed to close a file: fclose()");
    }
}