feat: add basic interface to create a new project

lib/lenna/cli/app.rb

@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2023, by Aristóteles Coutinho.
+
+require 'optparse'
+
+require 'lennarb/version'
+
+module Lenna
+	module Cli
+		# Mediator class for CLI
+		#
+		# @private `Since v0.1.0`
+		#
+		class App
+			# @return [Array] Arguments passed to CLI
+			#
+			attr_reader :args
+
+			# Initialize a new instance of the class
+			#
+			# @parameter args [Array] Arguments passed to CLI
+			#
+			def initialize(args)
+				@args = args
+			end
+
+			# Execute the command
+			#
+			# @return [void]
+			#
+			def execute(strategy)
+				strategy.is_a?(Commands::Interface) or fail ::ArgumentError
+
+				parser!(@args).then { strategy.execute(_1) }
+			end
+
+			private
+
+			# Parse the options passed to CLI
+			#
+			# @parameter args [Array] Arguments passed to CLI
+			#
+			# @return [Hash] Options passed to CLI
+			#
+			def parser!(args)
+				options = {}
+				OptionParser.new do |opts|
+					opts.banner = 'Usage: lenna [options]'
+
+					opts.on('-v', '--version', 'Print version') do
+						puts Lenna::VERSION
+						exit
+					end
+
+					opts.on('-h', '--help', 'Print help') do
+						puts opts
+						exit
+					end
+
+					opts.on('-n', '--new', 'Create a new app') do
+						options[:new] = true
+					end
+				end.parser!(args)
+
+				options
+			end
+		end
+	end
+end

lib/lenna/cli/commands/create_project.rb

@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require 'colorize'
+require 'erb'
+require 'fileutils'
+require 'lenna/cli/commands/interface'
+require 'lennarb/version'
+
+module Lenna
+	module Cli
+		module Commands
+			# Command for creating a new app
+			#
+			# @private `Since v0.1.0`
+			#
+			module CreateProject
+				extend Lenna::Cli::Commands::Interface, self
+				# Execute the command
+				#
+				# @parameter app_name [String] The name of the app
+				#
+				# @return [void]
+				#
+				def execute(app_name)
+					return puts 'Please specify an app name' if app_name.nil?
+
+					puts "Creating a new app named #{app_name}".green
+					create_app(app_name)
+					create_gemfile(app_name)
+				end
+
+				private
+
+				# Create a directory for the app
+				#
+				# @parameter app_name [String] The name of the app
+				#
+				# @return [void]
+				#
+				def create_app(app_name) = FileUtils.mkdir_p(app_name)
+
+				# Create a new Gemfile for the app. This will be use template
+				# file in the `templates` directory.
+				#
+				# @parameter app_name [String] The name of the app
+				#
+				# @return [void]
+				#
+				def create_gemfile(app_name)
+					FileUtils.cd(app_name).tap do
+						template_data = { version: Lennarb::VERSION }
+
+						erb_template =
+							Lennarb.root.join('lib/lenna/cli/templates/gemfile.erb')
+							.then { File.read(_1) }
+							.then { ERB.new(_1) }
+
+						File.write('Gemfile', erb_template.result_with_hash(template_data))
+					end
+				end
+			end
+		end
+	end
+end

lib/lenna/cli/commands/interface.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module Lenna
+	module Cli
+		module Commands
+			module Interface
+				def self.execute(args)
+					raise NotImplementedError
+				end
+			end
+		end
+	end
+end

lib/lenna/cli/templates/gemfile.erb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# [https://rubygems.org/gems/lennarb]
+# Lenna is a lightweight and experimental web framework for Ruby. It's designed
+# to be modular and easy to use. Also, that's how I affectionately call my wife.
+gem 'lennarb', '~> <%= version %>'
+# [https://rubygems.org/gems/falcon]
+# A fast, asynchronous, rack-compatible web server.
+gem 'falcon', '~> 0.42.3'
+
+group :development, :test do
+end