cdg directory navigation scripts + bash completion

cdg.sh

# cdg command
# A smarter cd, works well with up: http://daniele.livejournal.com/76011.html

# Help: cdg -h
# Show all links: cdg
# Delete link: cdg -d foo
# Clear all: cdg -c
# Store link to working directory: cdg -w foo
# Go to link: cdg foo
function cdg() {
  mkdir -p ~/.cdg
  dir=""
  if [ -z "$1" ]; then
    ls -Al ~/.cdg
  elif [ "-h" == "$1" ]; then
    echo 'Usage: cdg [-h | <name> | -w <name> | -d name | -c]' >&2
    return
  elif [ "-c" == "$1" ]; then
    for name in $(ls ~/.cdg); do
      unlink ~/.cdg/${name}
    done
  elif [ "-w" == "$1" ]; then
    if [ -z "$2" ]; then
      echo 'Usage: cdg -w <name>' >&2
      return
    fi
    ln -s $(pwd) ~/.cdg/$2
  elif [ "-d" == "$1" ]; then
    if [ -z "$2" ]; then
      echo 'Usage: cdg -d <name>' >&2
      return
    fi
    unlink ~/.cdg/$2
  else
    cd -P ~/.cdg/$1
  fi
}

cdg_completion.sh

#!/bin/sh
# Bash completion for cdg
function _cdg() {
  mkdir -p ~/.cdg
  local word=${COMP_WORDS[COMP_CWORD]}
  local names=$(ls ~/.cdg/)
  COMPREPLY=($(compgen -W "${names}" -- "${word}"))
  if [ -z ${COMPREPLY} ]; then COMPREPLY=""; fi
}

complete -o nospace -o default -F _cdg cdg