Implement lists functionality

Author: Sahil

todo_cli/README.md

@@ -33,4 +33,21 @@ source venv/bin/activate
 7. `todo complete item_id`
 8. `todo incomplete item_id`
 9. `help`
-10. `quit`
+10. `quit`
+
+## JSON Files
+
+### lists.json
+
+- stores a list of todo lists
+- a todo list is a dict having title and created_at field
+
+OR
+
+- stores a dict of todo lists having title as key and file name and time of creation as nested dict
+
+### list.json
+
+- list refers to the todo list name
+- stores a list of todo item
+- each todo item is a dict having title, created_at, and completed field.

todo_cli/app.py

@@ -8,19 +8,49 @@ def parse(command):
   cmd_type = cmd_list[0]
   if (cmd_type == 'help' or cmd_type == 'quit'):
     return cmd_type, []
-  elif (cmd_type == 'list' or cmd_type == 'todo'):
-    return cmd_list[1], cmd_list[2:]
+  elif (cmd_type == 'list'):
+    cmd_name = cmd_list[1]
+    if (cmd_name in ['show', 'use', 'create']):
+      return cmd_name, cmd_list[2:]
+    else:
+      return 'invalid', []
+  elif (cmd_type == 'todo'):
+    cmd_name = cmd_list[1]
+    if (cmd_name in ['add', 'all', 'edit', 'remove', 'complete', 'incomplete']):
+      return cmd_name, cmd_list[2:]
+    else:
+      return 'invalid', []
   else:
     return 'invalid', []
 
 def main():
   print('Started the Todo application...')
-
+  current_list = ''
   while(1):
     # take the command as input from the user
-    command = input()
+    command = input('$ ')
     command_name, command_args = parse(command)
-    print(command_name, command_args)
+    # print(command_name, command_args)
+    if (command_name == 'quit'):
+      break
+    elif (command_name == 'help'):
+      with open('help.txt', 'r') as help_file:
+        print(help_file.read())
+    elif (command_name == 'invalid'):
+      print('Please enter a valid command, use help command to display all!')
+    elif (command_name == 'use'):
+      file_name = commands_dict[command_name](command_args)
+      if (file_name == -1):
+        print('This is not a valid list name!')
+        current_list = ''
+      else:
+        print('Successfuly chosen this list...')
+        current_list = file_name
+    elif (command[0] == 'todo'):
+      command_args.insert(0, current_list)
+      commands_dict[command_name](command_args)
+    else:
+      commands_dict[command_name](command_args)
 
 if __name__ == '__main__':
   main()

todo_cli/commands/lists.py

@@ -1,8 +1,54 @@
+import os.path
+import json
+from datetime import datetime
+
+FILE_NAME = 'lists.json'
+
 def show_lists(args):
-  print(args)
+  with open(FILE_NAME, 'r') as lists_json:
+    try:
+      data = json.load(lists_json)
+      for index, todo_list in enumerate(data.keys()):
+        print(index + 1, data[todo_list]['title'])
+    except:
+      print('Some error occurred!')
 
 def use_list(args):
-  print(args)
+  list_name = args[0]
+  with open(FILE_NAME, 'r') as lists_json:
+    try:
+      data = json.load(lists_json)
+      if (data.get(list_name)):
+        return f'{list_name}.json'
+      else:
+        return -1
+    except:
+      print('Some error occurred!')
 
 def create_list(args):
-  print(args)
+  list_name = args[0]
+  # print(os.path.abspath('.'))
+  new_list = {}
+  with open(FILE_NAME, 'r+') as lists_json:
+    try:
+      data = json.load(lists_json)
+      # print(data)
+      # check if file already exists
+      if (data.get(list_name)):
+        print('List already exists! Try a different name...')
+      else:
+        # update the new_list dict
+        new_list = {
+        'title': list_name,
+        'created_at': datetime.now().strftime("%d/%m/%Y %H:%M:%S")
+        }
+        data[list_name] = new_list
+        with open(f'lists/{list_name}.json', 'w') as new_list:
+          # empty list
+          new_list.write('[\n]')
+          print('Successfully created the new list!')
+        # add to the lists.json
+        lists_json.seek(0)
+        json.dump(data, lists_json, sort_keys=True, indent=True)
+    except:
+      print('Some error occurred!')

todo_cli/commands/todos.py

@@ -1,17 +1,22 @@
+def set_list(list_name):
+  if (list_name == ''):
+    print('Please select a given list before this action')
+    return
+
 def add_item(args):
-  print(args)
+  set_list(args[0])
 
 def show_items(args):
-  print(args)
+  set_list(args[0])
 
 def edit_item(args):
-  print(args)
+  set_list(args[0])
 
 def remove_item(args):
-  print(args)
+  set_list(args[0])
 
 def complete_item(args):
-  print(args)
+  set_list(args[0])
 
 def incomplete_item(args):
-  print(args)
+  set_list(args[0])

todo_cli/help.txt

@@ -0,0 +1,12 @@
+The following commands are available:
+1. list show => shows all the lists available
+2. list use list_name => use a given list
+3. list create list_name => create a list with given name
+3. todo add item_names => add a todo item to the selected list
+4. todo all => show all the todo items in the chosen list
+5. todo edit item_id new_item_name => edit the todo item providing the id and new title
+6. todo remove item_id => remove a todo item
+7. todo complete item_id => mark a todo item as completed
+8. todo incomplete item_id => mark a todo item as incomplete
+9. help => prints this...
+10. quit => exit the application

todo_cli/lists.json

@@ -0,0 +1,3 @@
+{
+  
+}