buildscripts/walk.sh

   1 #!@SHELL@
   2 # walk.sh
   3 # ugh
   4 # print reversed relative path to $1
   5
   6 function base ()
   7 {
   8     expr "$1" : "\(/[^/]*\)"
   9 }
  10
  11 function unbase ()
  12 {
  13     expr "$1" : "/[^/]*\(.*\)"
  14 }
  15
  16 function walk ()
  17 {
  18     if expr "$1" : '/' > /dev/null 2>&1; then
  19         c=../
  20     fi
  21     from=`(cd "$1" && pwd) | sed 's://*:/:g'`
  22     to=`pwd | sed 's://*:/:g'`
  23     t=`base "$to"`
  24     f=`base "$from"`
  25     while [ -n "$t" -a "$t" = "$f" ]; do
  26         to=`unbase "$to"`
  27         from=`unbase "$from"`
  28         t=`base "$to"`
  29         f=`base "$from"`
  30     done
  31     i=`echo $from | sed -e 's:[^/]\+:..:g'`
  32     i=`echo $i | sed -e 's:/[.][.]:..:'`
  33     echo $c$i$to
  34 }
  35
  36 walk $1
  37