[split] Move bundler plugin to oh-my-fish/plugin-bundler

https://github.com/oh-my-fish/plugin-bundler

plugins/bundler/bundler.load

-# These methods override the default calls to append `bundle exec` if this gem
-# is available within the context of bundler.
-#
-# You can add more bundled executables in your config.fish:
-#
-#     set bundler_plugin_execs jekyll mustache
-#
-set -l execs annotate      \
-             cap           \
-             capify        \
-             cucumber      \
-             dashing       \
-             foreman       \
-             guard         \
-             kitchen       \
-             middleman     \
-             nanoc         \
-             puma          \
-             rackup        \
-             rainbows      \
-             rake          \
-             rspec         \
-             rubocop       \
-             ruby          \
-             shotgun       \
-             sidekiq       \
-             spec          \
-             spinach       \
-             spork         \
-             thin          \
-             thor          \
-             unicorn       \
-             unicorn_rails
-
-if set -q bundler_plugin_execs
-  set execs $execs $bundler_plugin_execs
-end
-
-# Fish 2.1.1+ has support for --inherit-variable
-set -l do_eval (echo $FISH_VERSION | grep 2.1.1-)
-
-for executable in $execs
-  if test -z "$do_eval"
-    eval "function $executable; __execute_as_bundler $executable \$argv; end"
-  else
-    function $executable --inherit-variable executable
-      __execute_as_bundler $executable $argv
-    end
-  end
-end
-
-function __execute_as_bundler
-  if __is_a_bundled_executable $argv[1]
-    command bundle exec $argv
-  else
-    eval command $argv
-  end
-end
-
-function __is_a_bundled_executable
-  set -l bindir (command bundle exec ruby -e 'puts Gem.bindir')
-  test -f "$bindir/$argv"
-end