lib/genomer/runtime.rb in genomer-0.0.8 vs lib/genomer/runtime.rb in genomer-0.0.9

@@ -1,54 +1,82 @@
 require 'unindent'
 require 'tempfile'
 require 'md2man'
 
+require 'genomer/version'
+
 class Genomer::Runtime
 
   attr :command
   attr :arguments
   attr :flags
 
+  MESSAGES = {
+    :error  => {
+      :init_again =>
+        "This directory contains a 'Gemfile' and already appears to be a genomer project."
+  },
+    :output => {
+      :version => "Genomer version #{Genomer::VERSION}",
+      :not_project =>
+        "Use `genomer init NAME` to create a new genomer project called NAME",
+      :simple_help =>
+        "genomer COMMAND [options]\nrun `genomer help` for a list of available commands",
+      :man =>
+        "genomer man COMMAND\nrun `genomer help` for a list of available commands"
+    }
+  }
+
+
+  def message(type,msg)
+    content = MESSAGES[type][msg]
+    type == :error ? raise(Genomer::Error, content) : content
+  end
+
+
   def initialize(settings)
     @command   = settings.rest.shift
     @arguments = settings.rest
     @flags     = settings
   end
 
   def execute!
-    case command
-    when nil    then short_help
-    when "help" then help
-    when "init" then init
-    when "man"  then man
-    else             run_plugin
+    return message :output, :version if flags[:version]
+
+    if genomer_project?
+      case command
+      when nil    then message :output, :simple_help
+      when "help" then help
+      when "init" then message :error, :init_again
+      when "man"  then man
+      else             run_plugin
+      end
+    else
+      case command
+      when "init" then init
+      else             message :output, :not_project
+      end
     end
   end
 
-  def short_help
-    msg =<<-EOF
-      genomer COMMAND [options]
-      run `genomer help` for a list of available commands
-    EOF
-    msg.unindent
-  end
-
   def help
     msg =<<-EOF
       genomer COMMAND [options]
 
       Available commands:
         init        Create a new genomer project
         man         View man page for the specified plugin
     EOF
     msg.unindent!
 
-    msg << Genomer::Plugin.plugins.inject(String.new) do |str,p|
-      str << '  '
-      str << p.name.gsub("genomer-plugin-","").ljust(12)
-      str << p.summary
-      str << "\n"
+    if File.exists?('Gemfile')
+      msg << Genomer::Plugin.plugins.inject(String.new) do |str,p|
+        str << '  '
+        str << p.name.gsub("genomer-plugin-","").ljust(12)
+        str << p.summary
+        str << "\n"
+      end
     end
     msg.strip
   end
 
   def man
@@ -63,16 +91,11 @@
         raise Genomer::Error, "No manual entry for command '#{arguments.join(' ')}'"
       end
 
       Kernel.exec "man #{groffed_man_file(location).path}"
     else
-      msg =<<-EOF
-        genomer man COMMAND
-        run `genomer help` for a list of available commands
-      EOF
-      msg.unindent!
-      msg.strip
+      message :output, :man
     end
   end
 
   def man_file(arguments)
     plugin = arguments.first
@@ -108,13 +131,16 @@
         file.print Genomer::Files.send(name.gsub('.','_').to_sym)
       end
     end
 
     "Genomer project '#{project_name}' created.\n"
-
   end
 
   def run_plugin
     Genomer::Plugin[command].new(arguments,flags).run
+  end
+
+  def genomer_project?
+    File.exists?('Gemfile')
   end
 
 end