| 1 | ;# pwd.pl - keeps track of current working directory in PWD environment var |
| 2 | ;# |
| 3 | ;# $RCSfile: pwd.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:11 $ |
| 4 | ;# |
| 5 | ;# $Log: pwd.pl,v $ |
| 6 | ;# |
| 7 | ;# Usage: |
| 8 | ;# require "pwd.pl"; |
| 9 | ;# &initpwd; |
| 10 | ;# ... |
| 11 | ;# &chdir($newdir); |
| 12 | |
| 13 | package pwd; |
| 14 | |
| 15 | sub main'initpwd { |
| 16 | if ($ENV{'PWD'}) { |
| 17 | local($dd,$di) = stat('.'); |
| 18 | local($pd,$pi) = stat($ENV{'PWD'}); |
| 19 | if ($di != $pi || $dd != $pd) { |
| 20 | chop($ENV{'PWD'} = `pwd`); |
| 21 | } |
| 22 | } |
| 23 | else { |
| 24 | chop($ENV{'PWD'} = `pwd`); |
| 25 | } |
| 26 | if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) { |
| 27 | local($pd,$pi) = stat($2); |
| 28 | local($dd,$di) = stat($1); |
| 29 | if ($di == $pi && $dd == $pd) { |
| 30 | $ENV{'PWD'}="$2$3"; |
| 31 | } |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | sub main'chdir { |
| 36 | local($newdir) = shift; |
| 37 | $newdir =~ s|/{2,}|/|g; |
| 38 | if (chdir $newdir) { |
| 39 | if ($newdir =~ m#^/#) { |
| 40 | $ENV{'PWD'} = $newdir; |
| 41 | } |
| 42 | else { |
| 43 | local(@curdir) = split(m#/#,$ENV{'PWD'}); |
| 44 | @curdir = '' unless @curdir; |
| 45 | foreach $component (split(m#/#, $newdir)) { |
| 46 | next if $component eq '.'; |
| 47 | pop(@curdir),next if $component eq '..'; |
| 48 | push(@curdir,$component); |
| 49 | } |
| 50 | $ENV{'PWD'} = join('/',@curdir) || '/'; |
| 51 | } |
| 52 | } |
| 53 | else { |
| 54 | 0; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | 1; |