checkout: specify checkout directory if URL ends with /trunk

lib/svi.rb

@@ -8,6 +8,10 @@ module Svi
   class << self
 
     def checkout(url)
+      checkout_directory = []
+      if url =~ %r{/([^/]+)/trunk$}
+        checkout_directory << $1
+      end
       last_checkout_message = ""
       checked_out_paths = []
       clear_message = lambda do
@@ -23,7 +27,7 @@ module Svi
           last_checkout_message = ""
         end
       end
-      SvnRunner.run_svn("checkout", [url], allow_interactive: true) do |line|
+      SvnRunner.run_svn("checkout", [url] + checkout_directory, allow_interactive: true) do |line|
         if line =~ /^A.{4}(.*)$/
           path = $1
           checked_out_paths << path