examples/functions/pathfuncs

   1 #From: "Simon J. Gerraty" <sjg@zen.void.oz.au>
   2 #Message-Id: <199510091130.VAA01188@zen.void.oz.au>
   3 #Subject: Re: a shell idea?
   4 #Date: Mon, 09 Oct 1995 21:30:20 +1000
   5
   6
   7 # NAME:
   8 #       add_path.sh - add dir to path
   9 #
  10 # DESCRIPTION:
  11 #       These functions originated in /etc/profile and ksh.kshrc, but
  12 #       are more useful in a separate file.
  13 #
  14 # SEE ALSO:
  15 #       /etc/profile
  16 #
  17 # AUTHOR:
  18 #       Simon J. Gerraty <sjg@zen.void.oz.au>
  19
  20 #       @(#)Copyright (c) 1991 Simon J. Gerraty
  21 #
  22 #       This file is provided in the hope that it will
  23 #       be of use.  There is absolutely NO WARRANTY.
  24 #       Permission to copy, redistribute or otherwise
  25 #       use this file is hereby granted provided that
  26 #       the above copyright notice and this notice are
  27 #       left intact.
  28
  29 # is $1 missing from $2 (or PATH) ?
  30 no_path() {
  31         eval "case :\$${2-PATH}: in *:$1:*) return 1;; *) return 0;; esac"
  32 }
  33 # if $1 exists and is not in path, append it
  34 add_path () {
  35   [ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="\$${2:-PATH}:$1"
  36 }
  37 # if $1 exists and is not in path, prepend it
  38 pre_path () {
  39   [ -d ${1:-.} ] && no_path $* && eval ${2:-PATH}="$1:\$${2:-PATH}"
  40 }
  41 # if $1 is in path, remove it
  42 del_path () {
  43   no_path $* || eval ${2:-PATH}=`eval echo :'$'${2:-PATH}: |
  44     sed -e "s;:$1:;:;g" -e "s;^:;;" -e "s;:\$;;"`
  45 }