Improve self-documentation of 3llo by adding a --help switch, show …

…errors without confusing tracebacks

bin/3llo

@@ -10,10 +10,29 @@ $container.register(:api_client, Tr3llo::HTTP::Client)
 prompt = TTY::Prompt.new
 $container.register(:interface, Tr3llo::Interface.new(prompt, $stdout))
 
+def print_help(flavour)
+  Tr3llo::Presenter::HelpPresenter
+    .new($container.resolve(:interface), flavour)
+    .print!
+end
+
+unless ARGV.empty?
+  if ARGV[0] =~ /^-h|--help$/
+    print_help(Tr3llo::Presenter::FLAVOUR_HELP_CLI)
+    exit
+  end
+end
+
 configuration = Tr3llo::Configuration.new
-configuration.user_id = ENV.fetch('TRELLO_USER') { raise "Have you set TRELLO_USER?" }
-configuration.api_key = ENV.fetch('TRELLO_KEY') { raise "Have you set TRELLO_KEY?" }
-configuration.api_token = ENV.fetch('TRELLO_TOKEN') { raise "Have you set TRELLO_TOKEN?" }
+begin
+  configuration.user_id = ENV.fetch('TRELLO_USER') { raise "Have you set TRELLO_USER?" }
+  configuration.api_key = ENV.fetch('TRELLO_KEY') { raise "Have you set TRELLO_KEY?" }
+  configuration.api_token = ENV.fetch('TRELLO_TOKEN') { raise "Have you set TRELLO_TOKEN?" }
+rescue => error
+  puts "\e[31mInvalid configuration: \e[1m#{error.message}\e[0m"
+  exit!
+end
+
 configuration.finalize!
 
 $container.register(
@@ -24,8 +43,6 @@ $container.register(
 user = Tr3llo::API::User.find($container.resolve(:configuration).user_id)
 $container.register(:user, user)
 
-Tr3llo::Presenter::HelpPresenter
-  .new($container.resolve(:interface))
-  .print!
+print_help(Tr3llo::Presenter::FLAVOUR_HELP_INDENTED)
 
 Tr3llo::Controller.new.start

lib/3llo/presenter/help.rb

@@ -1,13 +1,21 @@
 module Tr3llo
   module Presenter
+    FLAVOUR_HELP_INDENTED = 1
+    FLAVOUR_HELP_CLI = 2
+
     class HelpPresenter
-      def initialize(interface)
+      def initialize(interface, flavour = FLAVOUR_HELP_INDENTED)
         @interface = interface
+        @flavour = flavour
       end
 
       def print!
         interface.print_frame do
-          interface.puts menu_text
+          text = menu_text
+          if @flavour == FLAVOUR_HELP_CLI
+            text = text.split("\n").map(&:lstrip).drop(1).join("\n")
+          end
+          interface.puts text
         end
       end