plugins/bundler/bundler.plugin.zsh
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 alias be="bundle exec"
 alias bi="bundle install"
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 alias bl="bundle list"
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 alias bu="bundle update"
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 # The following is based on https://github.com/gma/bundler-exec
 
 bundled_commands=(cap capify cucumber heroku rackup rails rake rspec ruby shotgun spec spork thin unicorn unicorn_rails)
 
 ## Functions
 
 _bundler-installed() {
   which bundle > /dev/null 2>&1
 }
 
 _within-bundled-project() {
   local check_dir=$PWD
   while [ "$(dirname $check_dir)" != "/" ]; do
     [ -f "$check_dir/Gemfile" ] && return
     check_dir="$(dirname $check_dir)"
   done
   false
 }
 
 _run-with-bundler() {
   local command="$1"
   shift
   if _bundler-installed && _within-bundled-project; then
     bundle exec $command "$@"
   else
     $command "$@"
   fi
 }
 
 ## Main program
 for cmd in $bundled_commands; do
   alias $cmd="_run-with-bundler $cmd"
 done