view .shell.d/00.path_manipulation.sh @ 326:bfb70ab95398

hg: enable shelve extension
author Augie Fackler <raf@durin42.com>
date Tue, 11 Mar 2014 13:52:54 -0400
parents 7dfb7799567f
children c85072e620a8
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_element_from_var $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
}