CHRUBY_VERSION="0.3.9"

RUBIES=()

for dir in "$PREFIX/opt/rubies" "$HOME/.rubies"; do

[[ -d "$dir" && -n "$(command ls -A "$dir")" ]] && RUBIES+=("$dir"/*)

done

unset dir

function chruby_reset()

{

[[ -z "$RUBY_ROOT" ]] && return

PATH=":$PATH:"; PATH="${PATH//:$RUBY_ROOT\/bin:/:}"

[[ -n "$GEM_ROOT" ]] && PATH="${PATH//:$GEM_ROOT\/bin:/:}"

if (( UID != 0 )); then

[[ -n "$GEM_HOME" ]] && PATH="${PATH//:$GEM_HOME\/bin:/:}"

GEM_PATH=":$GEM_PATH:"

[[ -n "$GEM_HOME" ]] && GEM_PATH="${GEM_PATH//:$GEM_HOME:/:}"

[[ -n "$GEM_ROOT" ]] && GEM_PATH="${GEM_PATH//:$GEM_ROOT:/:}"

GEM_PATH="${GEM_PATH#:}"; GEM_PATH="${GEM_PATH%:}"

unset GEM_HOME

[[ -z "$GEM_PATH" ]] && unset GEM_PATH

fi

PATH="${PATH#:}"; PATH="${PATH%:}"

unset RUBY_ROOT RUBY_ENGINE RUBY_VERSION RUBYOPT GEM_ROOT

hash -r

}

function chruby_use()

{

if [[ ! -x "$1/bin/ruby" ]]; then

echo "chruby: $1/bin/ruby not executable" >&2

return 1

fi

[[ -n "$RUBY_ROOT" ]] && chruby_reset

export RUBY_ROOT="$1"

export RUBYOPT="$2"

export PATH="$RUBY_ROOT/bin:$PATH"

eval "$(RUBYGEMS_GEMDEPS="" "$RUBY_ROOT/bin/ruby" - <<EOF

puts "export RUBY_ENGINE=#{Object.const_defined?(:RUBY_ENGINE) ? RUBY_ENGINE : 'ruby'};"

puts "export RUBY_VERSION=#{RUBY_VERSION};"

begin; require 'rubygems'; puts "export GEM_ROOT=#{Gem.default_dir.inspect};"; rescue LoadError; end

EOF

)"

export PATH="${GEM_ROOT:+$GEM_ROOT/bin:}$PATH"

if (( UID != 0 )); then

export GEM_HOME="$HOME/.gem/$RUBY_ENGINE/$RUBY_VERSION"

export GEM_PATH="$GEM_HOME${GEM_ROOT:+:$GEM_ROOT}${GEM_PATH:+:$GEM_PATH}"

export PATH="$GEM_HOME/bin:$PATH"

fi

hash -r

}

function chruby()

{

case "$1" in

-h|--help)

echo "usage: chruby [RUBY|VERSION|system] [RUBYOPT...]"

;;

-V|--version)

echo "chruby: $CHRUBY_VERSION"

;;

"")

local dir ruby

for dir in "${RUBIES[@]}"; do

dir="${dir%%/}"; ruby="${dir##*/}"

if [[ "$dir" == "$RUBY_ROOT" ]]; then

echo " * ${ruby} ${RUBYOPT}"

else

echo " ${ruby}"

fi

done

;;

system) chruby_reset ;;

*)

local dir ruby match

for dir in "${RUBIES[@]}"; do

dir="${dir%%/}"; ruby="${dir##*/}"

case "$ruby" in

"$1") match="$dir" && break ;;

*"$1"*) match="$dir" ;;

esac

done

if [[ -z "$match" ]]; then

echo "chruby: unknown Ruby: $1" >&2

return 1

fi

shift

chruby_use "$match" "$*"

;;

esac

}