tec_utils.hpp

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// Time-stamp: <Last changed 2026-02-20 16:07:01 by magnolia>
/*----------------------------------------------------------------------
------------------------------------------------------------------------
Copyright (c) 2020-2026 The Emacs Cat (https://github.com/olddeuteronomy/tec).
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
------------------------------------------------------------------------
----------------------------------------------------------------------*/
#pragma once
 
#include <chrono>
#include <cstdio>
#include <string>
 
#include "tec/tec_def.hpp" // IWYU pragma: keep
 
 
namespace tec {
 
 
using Clock = std::chrono::steady_clock;
 
using Seconds = std::chrono::seconds;
 
using TimePointSec = std::chrono::time_point<Clock, Seconds>;
 
using MilliSec = std::chrono::milliseconds;
 
using TimePointMs = std::chrono::time_point<Clock, MilliSec>;
 
using MicroSec = std::chrono::microseconds;
 
using TimePointMu = std::chrono::time_point<Clock, MicroSec>;
 
template <typename Duration>
Duration now() {
    return std::chrono::duration_cast<Duration>(Clock::now() - std::chrono::time_point<Clock, Duration>());
}
 
template <typename Duration>
Duration since(Duration start) {
    return now<Duration>() - start;
}
 
constexpr const char* time_unit(Seconds) { return "s"; }
constexpr const char* time_unit(MilliSec) { return "ms"; }
constexpr const char* time_unit(MicroSec) { return "mu"; }
 
constexpr Seconds one_hour() { return Seconds(60 * 60); }
 
constexpr Seconds one_day() { return Seconds(24 * 60 * 60); }
 
 
template <typename Duration = MilliSec>
class Timer {
private:
    Duration src_; 
 
public:
    Timer() {
        start();
    }
 
    void start() {
        src_ = now<Duration>();
    }
 
    Duration stop() {
        return now<Duration>() - src_;
    }
};
 
 
#if !(defined(__TEC_WINDOWS__) || defined(__TEC_MINGW__))
 
#include <unistd.h>
#include <pwd.h>
 
#if defined(__TEC_APPLE__)
#include <sys/syslimits.h>
#else
#include <linux/limits.h>
#endif
 
inline std::string getcomputername() {
    char host[PATH_MAX];
    if (gethostname(host, sizeof(host)) == 0)
        return host;
    else
        return "";
}
 
inline std::string getusername() {
    uid_t uid = geteuid();
    struct passwd* pw = getpwuid(uid);
    if (pw != NULL)
        return pw->pw_name;
    else
        return "";
}
 
#endif // !(__TEC_WINDOWS__ || __TEC_MINGW__)
 
 
} // namespace tec
 
#if defined(__TEC_WINDOWS__) || defined(__TEC_MINGW__)
// MS Windows stuff goes here. NOT YET!
#include "tec/mswin/tec_win_utils.hpp"
#endif // __TEC_WINDOWS__