Use OptionParser for command line options

README.md

@@ -23,33 +23,36 @@ After you've [installed](#installation) `gh-auth`, you can give me ssh access
 with:
 
 ```bash
-$ gh-auth add chrishunt
+$ gh-auth --add chrishunt
 Adding 2 key(s) to '/Users/chris/.ssh/authorized_keys'
 ```
 
 That was easy! When we're done working, you can revoke my access with:
 
 ```bash
-$ gh-auth remove chrishunt
+$ gh-auth --remove chrishunt
 Removing 2 key(s) from '/Users/chris/.ssh/authorized_keys'
 ```
 
 You can add and remove any number of users at the same time.
 
 ```bash
-$ gh-auth add chrishunt zachmargolis
+$ gh-auth --add chrishunt,zachmargolis
 Adding 4 key(s) to '/Users/chris/.ssh/authorized_keys'
 
-$ gh-auth list
+$ gh-auth --list
 Added users: chrishunt, zachmargolis
 
-$ gh-auth remove chrishunt
+$ gh-auth --remove chrishunt
 Removing 2 key(s) from '/Users/chris/.ssh/authorized_keys'
 
-$ gh-auth remove zachmargolis
+$ gh-auth --list
+Added users: zachmargolis
+
+$ gh-auth --remove zachmargolis
 Removing 2 key(s) from '/Users/chris/.ssh/authorized_keys'
 
-$ gh-auth list
+$ gh-auth --list
 Added users:
 ```
 
@@ -78,7 +81,13 @@ Added users:
 `gh-auth` can be used from the command line after the gem has been installed.
 
 ```bash
-usage: gh-auth [--version] [add|remove|list] <username>
+usage: gh-auth [--version] [--list] [--add|--remove] <username>
+
+options:
+        --add doug,sally             Add GitHub users
+        --remove doug,sally          Remove GitHub users
+        --list                       List all GitHub users added
+        --version                    Show version
 ```
 
 ### In Your Project
@@ -90,14 +99,10 @@ too.
 require 'github/auth'
 
 # Add keys for GitHub user 'chrishunt'
-Github::Auth::CLI.new(%w(
-  add chrishunt
-)).execute
+Github::Auth::CLI.new.execute %w(--add chrishunt)
 
 # Remove keys for GitHub user 'chrishunt'
-Github::Auth::CLI.new(%w(
-  remove chrishunt
-)).execute
+Github::Auth::CLI.new.execute %w(--remove chrishunt)
 ```
 
 ## Installation
@@ -108,7 +113,13 @@ Install the `github-auth` gem:
 $ gem install github-auth
 
 $ gh-auth
-usage: gh-auth [--version] [add|remove|list] <username>
+usage: gh-auth [--version] [--list] [--add|--remove] <username>
+
+options:
+        --add doug,sally             Add GitHub users
+        --remove doug,sally          Remove GitHub users
+        --list                       List all GitHub users added
+        --version                    Show version
 ```
 
 ### SSH Public Key Authentication (Mac OS X)
@@ -136,7 +147,7 @@ First, authorize yourself for ssh. (Make sure to replace 'chrishunt' with
 *your* GitHub username)
 
 ```bash
-$ gh-auth add chrishunt
+$ gh-auth --add chrishunt
 Adding 2 key(s) to '/Users/chris/.ssh/authorized_keys'
 ```
 
@@ -152,7 +163,7 @@ $ ssh -o PreferredAuthentications=publickey localhost
 Next, remove your public keys from the keys file:
 
 ```bash
-$ gh-auth remove chrishunt
+$ gh-auth --remove chrishunt
 Removing 2 key(s) from '/Users/chris/.ssh/authorized_keys'
 ```
 

Rakefile

@@ -12,6 +12,7 @@ desc 'Check code quality'
 Cane::RakeTask.new(:quality) do |task|
   task.abc_max = 9
   task.use Cane::HashCheck
+  task.abc_exclude = %w(Auth::Options#initialize)
 end
 
 task default: :spec

bin/gh-auth

@@ -2,4 +2,4 @@
 
 require 'github/auth'
 
-Github::Auth::CLI.new(ARGV).execute
+Github::Auth::CLI.new.execute(ARGV)

lib/github/auth.rb

@@ -2,4 +2,5 @@
 require 'github/auth/key'
 require 'github/auth/keys_client'
 require 'github/auth/keys_file'
+require 'github/auth/options'
 require 'github/auth/cli'

lib/github/auth/cli.rb

@@ -1,43 +1,21 @@
 module Github::Auth
   # Command Line Interface for parsing and executing commands
   class CLI
-    attr_reader :command, :usernames
+    attr_reader :options
 
-    COMMANDS = %w(add remove list)
-
-    def initialize(argv)
-      @command   = argv.shift
-      @usernames = argv
-    end
-
-    def execute
-      if COMMANDS.include?(command)
-        send command
-      elsif command == '--version'
-        print_version
-      else
-        print_usage
-      end
+    def execute(args)
+      @options = Options.new.parse(args)
+      send options.command
     end
 
     private
 
     def add
-      if usernames.empty?
-        print_usage
-        return
-      end
-
       on_keys_file :write!,
         "Adding #{keys.count} key(s) to '#{keys_file.path}'"
     end
 
     def remove
-      if usernames.empty?
-        print_usage
-        return
-      end
-
       on_keys_file :delete!,
         "Removing #{keys.count} key(s) from '#{keys_file.path}'"
     end
@@ -46,6 +24,14 @@ def list
       puts "Added users: #{keys_file.github_users.join(', ')}"
     end
 
+    def version
+      puts Github::Auth::VERSION
+    end
+
+    def usage
+      puts options.usage
+    end
+
     def on_keys_file(action, message)
       puts message
       rescue_keys_file_errors { keys_file.send action, keys }
@@ -54,45 +40,19 @@ def on_keys_file(action, message)
     def rescue_keys_file_errors
       yield
     rescue KeysFile::PermissionDeniedError
-      print_permission_denied
-    rescue KeysFile::FileDoesNotExistError
-      print_file_does_not_exist
-    end
-
-    def print_usage
-      puts "usage: gh-auth [--version] [#{COMMANDS.join '|'}] <username>"
-    end
-
-    def print_version
-      puts "gh-auth version #{Github::Auth::VERSION}"
-    end
-
-    def print_permission_denied
       puts 'Permission denied!'
       puts
       puts "Make sure you have write permissions for '#{keys_file.path}'"
-    end
-
-    def print_file_does_not_exist
+    rescue KeysFile::FileDoesNotExistError
       puts "Keys file does not exist!"
       puts
       puts "Create one now and try again:"
       puts
       puts "  $ touch #{keys_file.path}"
     end
 
-    def print_github_user_does_not_exist(username)
-      puts "Github user '#{username}' does not exist"
-    end
-
-    def print_github_unavailable
-      puts "Github appears to be unavailable :("
-      puts
-      puts "https://status.github.com"
-    end
-
     def keys
-      @keys ||= usernames.map { |username| keys_for username }.flatten.compact
+      @keys ||= options.usernames.map { |user| keys_for user }.flatten.compact
     end
 
     def keys_for(username)
@@ -101,9 +61,11 @@ def keys_for(username)
         username: username
       ).keys
     rescue Github::Auth::KeysClient::GithubUserDoesNotExistError
-      print_github_user_does_not_exist username
+      puts "Github user '#{username}' does not exist"
     rescue Github::Auth::KeysClient::GithubUnavailableError
-      print_github_unavailable
+      puts "Github appears to be unavailable :("
+      puts
+      puts "https://status.github.com"
     end
 
     def keys_file

lib/github/auth/options.rb

@@ -0,0 +1,64 @@
+require 'optparse'
+
+module Github::Auth
+  # Parses command line options
+  class Options
+    attr_reader :parser
+
+    def initialize
+      @parser = OptionParser.new do |opts|
+        opts.banner = [
+          'usage: gh-auth',
+          '[--version]',
+          '[--list]',
+          '[--add|--remove]',
+          '<username>'
+        ].join(' ')
+
+        opts.separator "\noptions:"
+
+        opts.on(
+          '--add doug,sally', Array, 'Add GitHub users'
+        ) do |usernames|
+          raise OptionParser::MissingArgument if usernames.empty?
+          @command = 'add'
+          @usernames = usernames
+        end
+
+        opts.on(
+          '--remove doug,sally', Array, 'Remove GitHub users'
+        ) do |usernames|
+          raise OptionParser::MissingArgument if usernames.empty?
+          @command = 'remove'
+          @usernames = usernames
+        end
+
+        opts.on('--list', 'List all GitHub users added') do
+          @command = 'list'
+        end
+
+        opts.on('--version', 'Show version') do
+          @command = 'version'
+        end
+      end
+    end
+
+    def command
+      @command ||= 'usage'
+    end
+
+    def usernames
+      @usernames ||= []
+    end
+
+    def usage
+      parser.help
+    end
+
+    def parse(args)
+      parser.parse(args)
+    ensure
+      return self
+    end
+  end
+end

spec/acceptance/github/auth/cli_spec.rb

@@ -11,8 +11,8 @@
 
     after { keys_file.unlink }
 
-    def cli(argv)
-      described_class.new(argv).tap do |cli|
+    def cli
+      described_class.new.tap do |cli|
         cli.stub(
           github_hostname: hostname,
           keys_file_path: keys_file.path
@@ -21,35 +21,43 @@ def cli(argv)
     end
 
     it 'adds and removes keys from the keys file' do
-      cli(%w(add chrishunt)).execute
+      cli.execute %w(--add chrishunt)
 
       keys_file.read.tap do |keys_file_content|
         keys.each { |key| expect(keys_file_content).to include key.to_s }
       end
 
-      cli(%w(remove chrishunt)).execute
+      cli.execute %w(--remove chrishunt)
 
       expect(keys_file.read).to be_empty
 
       keys_file.unlink
     end
 
     it 'lists users from the keys file' do
-      cli(%w(add chrishunt)).execute
+      cli.execute %w(--add chrishunt)
 
       output = capture_stdout do
-        cli(%w(list)).execute
+        cli.execute %w(--list)
       end
 
       expect(output).to include('chrishunt')
     end
 
     it 'prints version information' do
       output = capture_stdout do
-        cli(%w(--version)).execute
+        cli.execute %w(--version)
       end
 
       expect(output).to include Github::Auth::VERSION
     end
+
+    it 'prints usage for invalid arguments' do
+      [[], %w(invalid), %w(--add)].each do |invalid_arguments|
+        expect(
+          capture_stdout { cli.execute invalid_arguments }
+        ).to include 'usage: gh-auth'
+      end
+    end
   end
 end