view .shell.d/00.path_manipulation.sh @ 135:de6d0a9a7e3f

path_manipulation: more flexible so it can be used on non-PATH items
author Augie Fackler <durin42@gmail.com>
date Tue, 18 Aug 2009 13:43:57 -0500
parents 62bfb554ab85
children 7dfb7799567f
line wrap: on
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# Functions for manipulating $PATH. Split out so I can use them in .zshenv if I want.

function insert_path_element() {
  insert_element_into_var $1 PATH
}

function remove_path_element() {
  remove_path_element $1 PATH
}

function insert_element_into_var () {
  eval varcontents=\$"$2"
  eval varname="$2"
  newcomp="$1"
  if echo "$varcontents" | grep "$newcomp:" >> /dev/null; then
    true
  elif [[ "$varcontents" == "" ]] ; then
    export $varname="$newcomp"
  else
    export $varname="$newcomp:$varcontents"
  fi
}

function remove_element_from_var() {
  eval varcontents=\$"$2"
  eval varname="$2"
  newcomp="$1"
  if echo "$varcontents" | grep "$newcomp:" >> /dev/null; then
    export $varname="`echo $varcontents | sed s%$newcomp:%%`"
  elif [[ "$varcontents" == "$newcomp" ]] ; then
    unset $varname
  else
    echo $1 not in $varname
  fi
}