Simple gem set switching for ruby

gemset.fish

function gemset --description 'Switches gemset'
	set gemset_name $argv[1]
  if [ -n "$gemset_name" ]
    set gem_dir "$HOME/.gems-switcher/$gemset_name" 
    echo "Using gemset: $gemset_name (location: '$gem_dir')"
    mkdir -p "$gem_dir/bin"
    set -xg PATH "$gem_dir/bin" $GEMLESS_PATH
    set -xg GEM_HOME "$gem_dir"
    set -xg GEM_PATH "$gem_dir"
  else
    echo "Using default gemset."
    set -e GEM_HOME
    set -e GEM_PATH
    set PATH $GEMLESS_PATH 
  end

end

gemset.sh

export GEMLESS_PATH=$PATH

function gemset {
  GEMSET_NAME="$1"
  if [  -n "$GEMSET_NAME" ]
  then
    GEMSET_DIR="$HOME/.gems-switcher/$GEMSET_NAME"
    echo "Using gemset: $GEMSET_NAME (location: '$GEMSET_DIR')"
    mkdir -p $GEMSET_DIR/bin
    export PATH="$GEMSET_DIR/bin:$GEMLESS_PATH"
    export GEM_HOME=$GEMSET_DIR
    export GEM_PATH=$GEMSET_DIR
  else
    echo "Using default gemset."
    unset GEM_HOME
    unset GEM_PATH
    export PATH=$GEMLESS_PATH
  fi
}