Fix a bug with installing new vim plugin from the command line

Fixes #328

bin/yadr/vundle.rb

@@ -7,7 +7,8 @@ module Vundle
 
     vundles = vundles_from_file
     last_bundle_dir = vundles.rindex{ |line| line =~ /^Bundle / }
-    vundles.insert last_bundle_dir+1, "Bundle \"#{plugin_repo}\""
+    last_bundle_dir = last_bundle_dir ? last_bundle_dir+1 : 0
+    vundles.insert last_bundle_dir, "Bundle \"#{plugin_repo}\""
     write_vundles_to_file vundles
   end
 
@@ -25,16 +26,18 @@ module Vundle
   end
 
   def self.update_vundle
-    system "vim --noplugin -u vim/vundles.vim -N \"+set hidden\" \"+syntax on\" +BundleClean +BundleInstall +qall"
+    system "vim --noplugin -u #{ENV['HOME']}/.vim/vundles.vim -N \"+set hidden\" \"+syntax on\" +BundleClean +BundleInstall +qall"
   end
 
 
   private
   def self.contains_vundle?(vundle_name)
+    FileUtils.touch(@vundles_path) unless File.exists? @vundles_path
     File.read(@vundles_path).include?(vundle_name)
   end
 
   def self.vundles_from_file
+    FileUtils.touch(@vundles_path) unless File.exists? @vundles_path
     File.read(@vundles_path).split("\n")
   end
 

vim/after/plugin/dune-ctags.vim

@@ -0,0 +1 @@
+set tags+=tags,gems.tags,stdlib.tags