Handling some error cases when calling for help.

lib/gitlab/help.rb

@@ -5,19 +5,35 @@ module Gitlab::Help
   extend Gitlab::CLI::Helpers
 
   def self.get_help(methods,cmd=nil)
+    help = ''
     if cmd.nil? || cmd === 'help'
-      puts actions_table
+      help = actions_table
     else
-      namespace = methods.select {|m| m[:name] === cmd }.map {|m| m[:owner]+'.'+m[:name] }.shift
-      if namespace
-        begin
-          puts `ri -T #{namespace}`
-        rescue => e
-          puts  e.message
+      ri_cmd = `which ri`.chomp
+      if $? == 0
+        namespace = methods.select {|m| m[:name] === cmd }.map {|m| m[:owner]+'.'+m[:name] }.shift
+        if namespace
+          begin
+            ri_output = `#{ri_cmd} -T #{namespace} 2>&1`.chomp
+            if $? == 0 
+              ri_output.gsub!(/#{cmd}\((.*)\)/, cmd+' \1')
+              ri_output.gsub!(/Gitlab\./,'gitlab> ')
+              ri_output.gsub!(/Gitlab\..+$/,'')
+              ri_output.gsub!(/\,/,'')
+              help = ri_output
+            else
+              help = "Ri docs not found for #{namespace}, please install the docs to use 'help'" 
+            end
+          rescue => e
+            puts e.message
+          end
+        else
+          help = "Unknown command: #{cmd}"
         end
       else
-        puts "Unknown command: #{cmd}"
+        help = "'ri' tool not found in your PATH, please install it to use the help."
       end
     end
+    puts help
   end
 end