59 lines
1.1 KiB
Perl
59 lines
1.1 KiB
Perl
;# pwd.pl - keeps track of current working directory in PWD environment var
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;#
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;# $RCSfile: pwd.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:11 $
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;#
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;# $Log: pwd.pl,v $
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;#
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;# Usage:
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;# require "pwd.pl";
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;# &initpwd;
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;# ...
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;# &chdir($newdir);
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package pwd;
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sub main'initpwd {
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if ($ENV{'PWD'}) {
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local($dd,$di) = stat('.');
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local($pd,$pi) = stat($ENV{'PWD'});
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if ($di != $pi || $dd != $pd) {
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chop($ENV{'PWD'} = `pwd`);
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}
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}
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else {
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chop($ENV{'PWD'} = `pwd`);
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}
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if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) {
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local($pd,$pi) = stat($2);
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local($dd,$di) = stat($1);
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if ($di == $pi && $dd == $pd) {
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$ENV{'PWD'}="$2$3";
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}
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}
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}
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sub main'chdir {
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local($newdir) = shift;
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$newdir =~ s|/{2,}|/|g;
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if (chdir $newdir) {
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if ($newdir =~ m#^/#) {
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$ENV{'PWD'} = $newdir;
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}
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else {
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local(@curdir) = split(m#/#,$ENV{'PWD'});
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@curdir = '' unless @curdir;
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foreach $component (split(m#/#, $newdir)) {
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next if $component eq '.';
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pop(@curdir),next if $component eq '..';
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push(@curdir,$component);
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}
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$ENV{'PWD'} = join('/',@curdir) || '/';
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}
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}
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else {
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0;
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}
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}
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1;
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