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I am trying to create a portfolio for my JavaScript projects. And in order to display the last write time of each index file, I use C++ and write directly to the file. However, because of how I wrote the code, the file that is read and written to is the same. So basically, if I compile my code once, the write time is displayed once. If compiled 2 times, the time is displayed twice, etc.

Question: How can I fix my C++ so that my last_write_time is always displayed once?

index.html:

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE-edge">
        <meta name="viewport", content="width=device-width, initial-scale=1.0">
        <title>My Portfolio!</title>
    </head>

    <body>
        <div id="navigation-bar">
            <a href="index.html">Home</a>
        </div>

        <div id="main-display">
            <div id="games-display">
                <h1>Games</h1>
                <a href="games.html"><img src="./Images/Games Display Background.jpg"></a>
            </div>

            <div id="non-games-display">
                <h1>Non-Games</h1>
                <a href="non-games.html"><img src="./Images/Non-Games Display Background.jpg"></a>
            </div>    
        </div>   
    </body>
</html>

non-games.html:

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE-edge">
        <meta name="viewport", content="width=device-width, initial-scale=1.0">
        <title>Non-Games</title>
    </head>

    <body>
        <div id="navigation-bar">
            <a href="index.html">Home</a>
        </div>

        <div id="non-games" style="width: 100vw; height: 100vh; font-size: 18pt; font-family: Arial, Helvetica, sans-serif; margin-left: 15px;">
            <a href="../JavaScript Non-Games/Analog Clock/index.html">Analog Clock</a><br>
            <a href="../JavaScript Non-Games/Bouncy Balls/Bouncy Balls.html">Bouncy Balls</a><br>
            <a href="../JavaScript Non-Games/Brick Layer/index.html">Brick Layer</a><br>
            <a href="../JavaScript Non-Games/Checklist/index.html">Checklist</a><br>
            <a href="../JavaScript Non-Games/DateToDay/index.html">Convert date to weekday</a><br>
            <a href="../JavaScript Non-Games/First Quiz/First Quiz.html">First Quiz</a><br>
            <a href="../JavaScript Non-Games/Growing Squares/index.html">Growing Squares</a><br>
            <a href="../JavaScript Non-Games/Jukebox remastered/Jukebox.html">Jukebox</a><br>
            <a href="../JavaScript Non-Games/Mouse Grid/index.html">Mouse Grid</a><br>
            <a href="../JavaScript Non-Games/My first graphic/Good canvas.htm">My First Graphic</a><br>
            <a href="../JavaScript Non-Games/NewTime/index.html">Convert a Current Time to a New Time</a><br>
            <a href="../JavaScript Non-Games/Paint Splatter/index.html">Paint Splatter</a><br>
            <a href="../JavaScript Non-Games/Random Group Assignment (Matt's version)/index.html">Random Group Assignment</a><br>
            <a href="../JavaScript Non-Games/Random number/Random number.htm">Random Number Generator</a><br>
            <a href="../JavaScript Non-Games/Snake Eyes/Snake Eyes.html">Snake Eyes</a><br>
            <a href="../JavaScript Non-Games/StopWatch/index.html">Stop Watch</a><br>
            <a href="../JavaScript Non-Games/TimeDifference/index.html">Length Between Two Times</a><br>
        </div>

        <script></script>
    </body>
</html>

games.html:

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE-edge">
        <meta name="viewport", content="width=device-width, initial-scale=1.0">
        <title>Games</title>
    </head>

    <body>
        <div id="navigation-bar">
            <a href="index.html">Home</a>
        </div>

        <div id="games" style="width: 100vw; height: 100vh; font-size: 18pt; font-family: Arial, Helvetica, sans-serif; margin-left: 15px; border-right: 1px solid black;">
            <a href="../JavaScript Games/Cookie Clicker game/index.html">Cookie Clicker</a><br>
            <a href="../JavaScript Games/Fighting Game/Fighting Game.html">Fighting Game</a><br>
            <a href="../JavaScript Games/Guess That Word!/index.html">Guess That Word!</a><br>
            <a href="../JavaScript Games/Rock Paper Scissors/Rock Paper Scissors Game.htm">Rock Paper Scissors</a><br>
            <a href="../JavaScript Games/Whac-a-mole/Whac-a-mole.htm">Whac-a-Mole</a><br>
        </div>  

        <script></script>
    </body>
</html>

main.cpp:

#include <iostream>
#include <filesystem>
#include <fstream>
#include <chrono>
#include <string>
#include <sstream>
#include <iomanip>
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif

namespace fs = std::filesystem;

std::string format_time(fs::file_time_type ftime) {
    auto sctp = std::chrono::time_point_cast<std::chrono::system_clock::duration>(
        ftime - fs::file_time_type::clock::now() + std::chrono::system_clock::now()
    );
    std::time_t cftime = std::chrono::system_clock::to_time_t(sctp);
    std::tm* tm = std::localtime(&cftime);
    std::ostringstream oss;
    oss << std::put_time(tm, "%A %B %d, %Y At %H:%M:%S");
    return oss.str();
}

void update_html(const std::string& html_path, const std::string& base_dir) {
    std::ifstream infile(html_path);
    std::ostringstream buffer;
    buffer << infile.rdbuf();
    std::string html_content = buffer.str();
    infile.close();

    std::string updated_content;
    std::istringstream iss(html_content);
    std::string line;
    while (std::getline(iss, line)) {
        size_t pos = line.find("<a href="");
        if (pos != std::string::npos) {
            size_t start = pos + 9; // Skip '<a href="'
            size_t end = line.find(""", start);
            std::string relative_path = line.substr(start, end - start);
            fs::path filepath = fs::path(base_dir) / relative_path;

            if (fs::exists(filepath)) {
                std::string last_write_time = format_time(fs::last_write_time(filepath));
                size_t close_tag_pos = line.find("</a>", end);
                if (close_tag_pos != std::string::npos) {
                    line.insert(close_tag_pos, " (Last Updated On " + last_write_time + ")");
                }
            }
        }
        updated_content += line + "n";
    }

    std::ofstream outfile(html_path);
    outfile << updated_content;
    outfile.close();
}

void open_html(const std::string& file_path) {
    std::string command;
#ifdef _WIN32
    command = "start " + file_path;
#else
    command = "xdg-open " + file_path;
#endif
    system(command.c_str());
}

int main() {
    std::string games_html = "games.html";
    std::string non_games_html = "non-games.html";
    std::string games_dir = "../JavaScript Games";
    std::string non_games_dir = "../JavaScript Non-Games";

    update_html(games_html, games_dir);
    update_html(non_games_html, non_games_dir);

    open_html("index.html");

    return 0;
}

I have tried to make a temp file, but I didn’t know how to do it correctly. Based on how my code is written, I’m not quite sure how to do it. I was going to try and just use C++ to write each file, but I wanted to try to make this work first.

An example of 2 compilations:
Whac-a-mole (Last Updated On DATE At TIME)(Last Updated On DATE At TIME)

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Danh mục

How can I stop my C++ from appending multiple times to html?