logmeow/log.cpp

#include <ctime>
#include <string>
#include <vector>
#include <iomanip>
#include <sstream>
#include <iostream>
#include <exception>
#include <system_error>

#include "log.h"

static time_t current_time() {
    static bool no_time_warned = false;
    struct timespec tp;

    if (!clock_gettime(CLOCK_REALTIME, &tp)) {
        return tp.tv_sec;
    }

    if (no_time_warned) {
        return 0;
    }
    no_time_warned = true;

    std::system_error e = std::system_error(errno, std::generic_category(), "clock_gettime()");
    log("Failed to get current time", std::move(e));
    return 0;
}


std::string log_entries;

void log(std::string entry, time_t time) {
    size_t last_newline_pos = 0, newline_pos;
    std::string line;
    char time_as_str[128] = {0};

    strftime(time_as_str, 127 * sizeof(char), "%c", localtime(&time));
    do {
        newline_pos = entry.find('\n', last_newline_pos);
        line = '[';
        line += time_as_str;
        line += "] ";
        line += entry.substr(last_newline_pos, newline_pos);

        printf("%s\n", line.c_str());
        if (!log_entries.empty()) {
            log_entries += '\n';
        }
        log_entries += std::move(line);
        last_newline_pos = newline_pos + 1;
    } while (last_newline_pos);
}

void log(std::string entry) {
    log(std::move(entry), current_time());
}

void log(std::string action, const std::exception& e, time_t time) {
    log(action + ": " + e.what(), time);
}

void log(std::string action, const std::exception& e) {
    log(std::move(action), e, current_time());
}

std::string quote(const std::string& str) {
    std::stringstream ss;
    ss << std::quoted(str);
    return ss.str();
}