Fiz esse programa pela necessidade de criar, modificar e gerenciar notas rapidamente pelo terminal, tirando a necessidade de abrir um programa com interface gráfica apenas para isso. Repositório no GitHub: https://github.com/artrabelo/cup

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#!/usr/bin/env python3
# -*- coding:utf-8 -*-

import sys
import argparse
import os
import logging
import datetime
import json

logging.basicConfig(
   filename="logfile.log",
   filemode="w",
   format="[%(levelname)s] %(asctime)s - line %(lineno)s - %(message)s",
   level=logging.INFO)

# -----------------------------------------------------------------------
# Default variables

default = "notes"
fp = default + ".json"
wdir = os.path.dirname(os.path.realpath(__file__))
logging.debug(f"Working directory: {wdir}")

# -----------------------------------------------------------------------

class Notebook:
   """
   Defines a Notebook object."""

   def __init__(self, title=default, path=None, notes=[], last_updated=None):
      self.title = title
      if path is None:      
         self.path = os.path.join(wdir, title + ".json")
      else:
         self.path = path
      self.notes = notes
      self.last_updated = last_updated
      
   def update_changes(self):
      """
      Updates unsaved changes to file.
      This method should be called whenever a change is made."""

      # Fix for notes ids getting messed up when removing a note
      for note in self.notes:
         note_index = self.notes.index(note) + 1
         if note["id"] != note_index:
            note["id"] = note_index
      
      # Update JSON file
      data = self.__dict__
      logging.debug(f"Data to be written: '{data}'")

      with open(self.path, "w", encoding="utf-8") as f:
         json.dump(data, f, indent=2)
         logging.info("Sucessfully updated file")

      """except Exception as e:
         logging.error(f"couldn't update json file: {e}")
         print(f"'{self.title}' notebook couldn't be updated ({e})")"""

   def get_note(self, note_id):
      """Returns a note with index N."""

      if self.notes:
         if note_id > 0: note_id -= 1
         try:
            note = self.notes[note_id]
            logging.info(f"Getting note with id {note_id}")
            return note
         except IndexError:
            logging.error(f"A note with id ({note_id}) was not found")
            print(f"Note ({note_id+1}) not found.")
      
   def current_time(self):
      """Get current time."""

      return datetime.datetime.now()
   
   def create_note(self, content, title=None):
      """Creates a new note."""

      note_id = 1 if not self.notes else len(self.notes) + 1
      created = self.current_time().strftime("%Y%m%d%H%M%S")
      title = "Untitled" if title is None else title[0]
      content_data = {"id": note_id, "created": created, "title": title, "content": content}

      self.notes.append(content_data)
      self.last_updated = content_data["created"]
      print("Note created.")
      self.update_changes()
   
   def edit_note(self, note_id):
      """Edits a note with index N."""

      note = self.get_note(note_id)
      if note:
         try:
            note["title"] = input("New title: ")
            if not note["title"]:
               note["title"] = "Untitled"
            note["content"] = input("Note:\n")
            print("Note edited.")
            note["last_edited"] = self.current_time().strftime("%Y%m%d%H%M%S")
            self.update_changes()
         except KeyboardInterrupt:
            print("\nAborting.")
   
   def read_note(self, note_id, card=False):
      """Reads a note with index N."""

      note = self.get_note(note_id)
      if note:
         index, text, title = note["id"], note["content"], note["title"]
         edited = note["created"] if not "edited" in note.keys() else note["edited"]
         last_edited = datetime.datetime.strptime(edited, "%Y%m%d%H%M%S")
         time = last_edited.strftime("%Y-%m-%d, %H:%M")

         if card:
            """
            If running using note index, i.e. "cup.py rd 1",
            it will print the full content.

            ---------------------------------------------
            Title
            -----
            This is an example and contains a title.
            
            Last edited: 2022-05-27, 21:59.
            ---------------------------------------------
            """
            print(f"{title}")
            print("-" * len(title))
            print("".join(text))
            if text and not text[len(text)-1].endswith("\n"):
               print()
            print(f"Last edited: {time}.")

         else:
            """
            By default, it will print notes in list view.
            -----------------------------------------------
            [1] 2022-05-27, 21:59 - This is another example
            -----------------------------------------------
            """

            if title == "Untitled":
               if "\n" in text:
                  text = text.splitlines()[0] + "(...)"
               title = text

            print(f"[{index}] {time} - {title}")

   def show_notes(self):
      """Prints notes to the terminal."""

      if self.notes:
         print("Your notes:")
         for i in range(1, len(self.notes)+1):
            self.read_note(i)
      else:
         print("You don't have any notes yet.")
         print(f"Try adding a note with 'cup.py add [note]'")
      
   def delete_note(self, note_id):
      """Deletes a note with index N."""

      note = self.get_note(note_id)
      if note:
         logging.info(f"Removing note ({note_id})")
         self.notes.remove(note)
         self.update_changes()
         self.show_notes()

def load_notebook():
   """Check if a notebook already exists."""
   if os.path.exists(fp):
      with open(fp, "r") as filepath:
         content = filepath.read()
      return json.loads(content)
   else:
      return None

def get_args():
   parser = argparse.ArgumentParser(prog="cup", description="A simple command-line note manager.")
   subparser = parser.add_subparsers(dest="com")

   add = subparser.add_parser("add", help="creates a new note")
   add.add_argument("text", nargs="?", help="note's content")
   add.add_argument("-t", nargs="+", help="note's title")

   ed = subparser.add_parser("ed", help="edits a note")
   ed.add_argument("id", type=int, help="note's ID")
   rd = subparser.add_parser("cat", help="reads a note")
   rd.add_argument("id", type=int, help="note's ID")
   rm = subparser.add_parser("rm", help="removes a note")
   rm.add_argument("id", type=int, help="note's ID")

   args = parser.parse_args()
   return args

def main():

   # Check if a notebook already exists in directory
   data = load_notebook()
   if data is None:
      n = Notebook()
   else:
      n = Notebook(**data)

   if len(sys.argv) == 1:
      n.show_notes()
   else:
      args = get_args()
      if args.com == "add":
         text, title = args.text, None if not args.t else args.t
         n.create_note(text, title)
         n.show_notes()
      
      elif args.com in ["cat", "ed", "rm"]:
         funcs = {
            "cat": n.read_note,
            "ed": n.edit_note ,
            "rm": n.delete_note }
         if args.com == "cat":
            funcs[args.com](note_id=args.id, card=True)
         else:
            funcs[args.com](note_id=args.id)

if __name__ == "__main__":
   main()

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