Select multiple files and concatenate their content into a single plain-text file for AI input.

README.md

FileJoinerGPT — Prepare Your Code for GPT

FileJoinerGPT is a lightweight Python GUI tool that lets you select multiple source code or text files, view the selected list, and concatenate their contents into a single file — perfect for feeding into GPT or other large language models (LLMs).

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🧠 Why use it?

LLMs like GPT often work best when given the full picture in a single input prompt. FileJoinerGPT helps you:

• Combine multiple .py, .txt, .json, etc. files
• Keep a persistent list of selected files across sessions
• Export the full combined content into one .txt file
• Stay focused: no distractions, no bloat, just what you need

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⚙️ Features

• ✅ Select multiple files through GUI
• ✅ View full file list inside the app
• ✅ Automatically remembers your last selection
• ✅ One-click export to output.txt with filenames and content
• ✅ Written in pure Python using tkinter (no dependencies)

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🚀 How to run

🐍 Requirements

• Python 3.6+
• Tkinter (usually preinstalled)

On Ubuntu/Debian:

sudo apt install python3-tk
python3 ./FileJoinerGPT.py

FileJoinerGPT.py

#sudo apt update
#sudo apt install python3-tk

import os
import json
import tempfile
import tkinter as tk
from tkinter import filedialog, messagebox, scrolledtext

# Paths
SAVE_FILE = os.path.join(tempfile.gettempdir(), "selected_files.json")
OUTPUT_FILE = "output.txt"

def load_file_list():
    if os.path.exists(SAVE_FILE):
        with open(SAVE_FILE, "r", encoding="utf-8") as f:
            return json.load(f)
    return []

def save_file_list(file_list):
    with open(SAVE_FILE, "w", encoding="utf-8") as f:
        json.dump(file_list, f, indent=2)

def select_files():
    files = filedialog.askopenfilenames(title="Select files")
    if files:
        file_list.clear()
        file_list.extend(files)
        update_display()
        save_file_list(file_list)

def update_display():
    display_text.delete(1.0, tk.END)
    for f in file_list:
        display_text.insert(tk.END, f + "\n")

def export_to_text():
    if not file_list:
        messagebox.showwarning("No files", "Please select files first.")
        return

    with open(OUTPUT_FILE, "w", encoding="utf-8") as out:
        for file_path in file_list:
            filename = os.path.basename(file_path)
            try:
                with open(file_path, "r", encoding="utf-8") as f:
                    content = f.read()
            except Exception as e:
                content = f"⚠️ Error reading file: {e}"

            out.write(f"File {filename}:\n")
            out.write("```\n")
            out.write(content)
            out.write("\n```\n\n")

    messagebox.showinfo("Done", f"Content saved to {OUTPUT_FILE}")

def clear_file_list():
    file_list.clear()
    update_display()
    save_file_list(file_list)

# GUI
root = tk.Tk()
root.title("CodeConcat — Prepare Your Code for GPT")

file_list = load_file_list()

tk.Button(root, text="Select Files", command=select_files).pack(pady=5)
tk.Button(root, text="Export to output.txt", command=export_to_text).pack(pady=5)
tk.Button(root, text="Clear List", command=clear_file_list).pack(pady=5)

display_text = scrolledtext.ScrolledText(root, width=80, height=20)
display_text.pack(padx=10, pady=10)
update_display()

root.mainloop()