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#! /bin/bash

DIRS="$HOME/.gtDirs"
if test ! -e $DIRS
then
  touch $DIRS
fi

gt () {  case $1 in
      -d)
          temp=`mktemp -t .gtDirs-XXXXXX`
          sed "/^$2=/"d $DIRS > $temp
          mv $temp $DIRS
          rm -f $temp
          ;;
      -a)
          validate_bookmark_name "$@"
          if [ -z "$result" ]; then
              CURDIR=$PWD
               echo "$2=$CURDIR" >> $DIRS
          fi
          ;;
      -l)
          cat $DIRS
          ;;
      -h)
          print_usage
          ;;
      *)
          if [ -z $1 ]; then
              print_usage
          elif [[ ! -z `awk -F '=' '/^'"$1"'=/ {print $2 }' $DIRS` ]]; then
              cd `awk -F '=' '/^'"$1"'=/ {print $2 }' $DIRS`
              else
              echo 'error: bookmark name not found'

          fi

  esac
}

#validate names
function validate_bookmark_name {  result=""
  if [ -z $2 ]; then
      result='error: bookmark name required!'
      echo $result
  elif [ -z `echo $2 | sed 's/[^A-Za-z0-9_]//g' ` ]; then
      result='error: bookmark name is invalid!'
      echo $result
  fi

}

function print_usage {      echo  'Usage:'
          echo  '-a <bookmark_name> - Saves the current directory as "bookmark_name"'
          echo  '-d <bookmark_name> - Deletes the bookmark'
          echo  '-l                 - Lists all available bookmarks'
          echo  '-h(-help,--help)   - Lists usage'
          echo  '<bookmark_name>    - Jump to the bookmark'
}

function _l {  awk -F '=' ' {print $1} ' $DIRS
}

function _comp {    local curw
    COMPREPLY=()
    curw=${COMP_WORDS[COMP_CWORD]}
    COMPREPLY=($(compgen -W '`_l`' -- $curw))
    return 0
}

# ZSH completion command
function _compzsh {    reply=($(_l))
}

if [ $ZSH_VERSION ]; then
  compctl -K _compzsh gt
else
  shopt -s progcomp
  complete -F _comp gt
fi

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current_user:~$ cd sourcecode/study/
current_user:~/sourcecode/study$ gt -a study
current_user:~/sourcecode/study$ cd ~
current_user:~$ gt study
current_user:~/sourcecode/study$ gt -l
goAgent=/Users/twer/sourcecode/goagent/goagent-goagent-9c1edd3/local
octopress=/Users/twer/sourcecode/octopress
goShell=/Users/twer/sourcecode/shell/goShell
study=/Users/twer/sourcecode/study

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current_user:~/sourcecode/study$ gt -d study
current_user:~/sourcecode/study$ gt -l
goAgent=/Users/twer/sourcecode/goagent/goagent-goagent-9c1edd3/local
octopress=/Users/twer/sourcecode/octopress
goShell=/Users/twer/sourcecode/shell/goShell

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current_user:~/sourcecode/study$ gt -h
Usage:
-a <bookmark_name> - Saves the current directory as "bookmark_name"
-d <bookmark_name> - Deletes the bookmark
-l                 - Lists all available bookmarks
-h(-help,--help)   - Lists usage
<bookmark_name>    - Jump to the bookmark

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current_user:~/sourcecode/study$ gt go<Tab>
goAgent  goShell
current_user:~/sourcecode/study$ gt goShell