Command line todo list

03-command-line-todo-list/Gemfile

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+source "https://rubygems.org"
+
+gem 'thor', '~> 0.20.0'

03-command-line-todo-list/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    thor (0.20.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  thor (~> 0.20.0)
+
+BUNDLED WITH
+   1.16.1

03-command-line-todo-list/README.md

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+## Command line todo list
+
+### Description
+
+Write an command line application that helps you manage your tasks.
+
+The information can be stored in any prefered way. The program should be launched from the console with different attributes:
+
+```
+	-a or --add		adds an item into the list
+	-l or --list		displays the list
+	-r or --remove		removes the last n in the list
+	-c or --clear		clears the list
+	-h or --help		shows list of available commands
+```

03-command-line-todo-list/database.yaml

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+---
+:tasks:
+- Lick a car tire
+- Eat a whole piece of paper
+- Pick your friend’s nose
+- Get into a debate with a wall
+- Burp the alphabet
+- Eat a spoonful of mustard
+- Talk without closing your mouth

03-command-line-todo-list/lib/cli.rb

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+require "thor"
+require_relative "database"
+
+module Todo
+  class CLI < Thor
+    def initialize(*args)
+      @store = Todo::Database.new
+
+      super
+    end
+
+    desc "-a or --add [TASK]", "Adds an item into the list of tasks"
+    map %w[-a --add] => :add
+    def add(task)
+      @store.tasks = @store.tasks << task
+
+      pretty_print_tasks(@store.tasks)
+    end
+
+    desc "-d or --delete [NUMBER]", "Deletes task at index NUMBER from the list"
+    map %w[-d --delete] => :delete
+    def delete(item)
+      tasks = @store.tasks
+
+      if tasks.length < item.to_i
+          shell.say "Task at number #{item} does not exist\n\n"
+          return
+      end
+
+      shell.say "\n\"\e[1m#{tasks.delete_at(item.to_i - 1)}\"\e[0m [removed]\n\n"
+      @store.tasks = tasks
+    end
+
+    desc "-r or --remove [NUMBER]", "Removes the last NUMBER of items the list"
+    map %w[-r --remove] => :remove
+    def remove(items)
+      tasks = @store.tasks
+      clear and return if tasks.length <= items.to_i
+      @store.tasks = tasks - tasks.last(items.to_i)
+
+      tasks.last(items.to_i).each do |task|
+        shell.say "\"#{task}\" \e[1m[removed]\e[0m"
+      end
+    end
+
+    desc "-l or --list", "List the tasks"
+    map %w[-l --list] => :list
+    def list
+      pretty_print_tasks(@store.tasks)
+    end
+
+    desc "-c or --clear", "Clears all tasks"
+    map %w[-c --clear] => :clear
+    def clear
+      @store.tasks = []
+      pretty_print_tasks(@store.tasks)
+    end
+
+    desc "-h or --help", "Displays a list of possible commands"
+    map %w[-h --help] => :help
+    def help
+      super
+    end
+
+    protected
+
+    def pretty_print_tasks(tasks)
+      shell.say "\n\tThere are currently \e[1m#{tasks.length} tasks\e[0m\n\n"
+      tasks.each_with_index { |item, index| shell.say "\t%02d #{item}" % (index + 1) }
+      shell.say
+    end
+  end
+end

03-command-line-todo-list/lib/database.rb

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+require "yaml/store"
+
+module Todo
+  class Database
+    attr_accessor :store, :tasks
+
+    def initialize(db_name = 'database')
+      @store = YAML::Store.new("#{db_name}.yaml")
+      initialize_store
+    end
+
+    def initialize_store
+      @store.transaction do
+        @store[:tasks] ||= []
+        @store.commit
+      end
+    end
+
+    def tasks=(tasks)
+      @store.transaction do
+        @store[:tasks] = tasks
+        @tasks = tasks
+        @store.commit
+      end
+
+      @tasks
+    end
+
+    def tasks
+      tasks = []
+
+      @store.transaction do
+        tasks = @store[:tasks]
+      end
+
+      tasks
+    end
+  end
+end

03-command-line-todo-list/todo.rb

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+#!/usr/bin/env ruby
+
+require_relative "lib/cli"
+
+Todo::CLI.start(ARGV)