texteditor.py

try:
    import tkinter as tk
except:
    import Tkinter as tk

try:
    import messagebox as pop_up
except:
    import tkinter.messagebox as pop_up

import time

def txt():
    
    EMPTY_TITLE_ERROR_MESSAGE_SAVE = "Please write the name of the file you want to save in the given field."
    EMPTY_TITLE_ERROR_MESSAGE_OPEN = "Please write the name of the file you want to open in the given field."
    FILE_NOT_FOUND_ERROR_MESSAGE = "No file with the given title was found, remember that this text editor can only read files in its directory."
    SAVING_SUCCESS_MESSAGE = "Your text is now stored in the {filename} file"
    SIGNATURE_TXT_NOT_FOUND_MESSAGE = "Please be sure that the file you want to open exists and that it is in the same folder of this editor."


    def _open():
        if not file_title.get():
            pop_up.showerror("Title is empty.",EMPTY_TITLE_ERROR_MESSAGE_OPEN)
            return 1

        if not ".txt" in file_title.get():
            filename = file_title.get() + ".txt"

        try:
            with open(filename) as f:
                main_text.delete("1.0",tk.END)
                main_text.insert(tk.INSERT, f.read(), "a")
        except IOError:
            pop_up.showerror("File not found.",FILE_NOT_FOUND_ERROR_MESSAGE)

    def save():
        if not file_title.get():
            pop_up.showerror("No title.",EMPTY_TITLE_ERROR_MESSAGE_SAVE)
            return 1

        if not ".txt" in file_title.get():
            filename = file_title.get() + ".txt"

        with open(filename,"w+") as f:
            f.write(main_text.get(1.0,tk.END))
        pop_up.showinfo("File saved succesfully.",SAVING_SUCCESS_MESSAGE.format(filename=filename))

    def add_date():
        full_date = time.localtime()
        day = str(full_date.tm_mday)
        month = str(full_date.tm_mon)
        year = str(full_date.tm_year)
        date = "\n"+day+'/'+month+'/'+year
        main_text.insert(tk.INSERT, date, "a")

    def add_signature():
        try:
            with open("signature.txt") as f:
                main_text.insert(tk.INSERT, "\n"+f.read(), "a")
        except IOError:
            MESSAGE = SIGNATURE_TXT_NOT_FOUND_MESSAGE
            pop_up.showerror("\"signature.txt\" not found.",MESSAGE)
            
    def close_txt():
        root.destroy()

    root = tk.Tk()
    root.resizable(width=False, height=False)
    root.title('Text Editor')

    menubar = tk.Menu(root)
    menubar.add_command(label="Open", command=_open)
    menubar.add_command(label="Save", command=save)
    menubar.add_command(label="Add signature",command=add_signature)
    menubar.add_command(label="Add date",command=add_date)
    menubar.add_command(label="Exit", command=close_txt)


    root.config(menu=menubar)

    top = tk.Frame(root)
    temp = tk.Label(root,text="Title:")
    temp.pack(in_ = top,side=tk.LEFT)

    file_title = tk.Entry(root)
    file_title.pack(in_ = top,side=tk.RIGHT)

    top.pack()

    main_text = tk.Text(root)
    main_text.pack()

    tk.mainloop()