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#!/usr/local/bin/perl
# mklink.pl
# The first command line argument is a non-empty relative path
# specifying the "from" directory.
# Each other argument is a file name not containing / and
# names a file in the current directory.
#
# For each of these files, we create in the "from" directory a link
# of the same name pointing to the local file.
#
# We assume that the directory structure is a tree, i.e. that it does
# not contain symbolic links and that the parent of / is never referenced.
# Apart from this, this script should be able to handle even the most
# pathological cases.
use Cwd;
my $from = shift;
my @files = @ARGV;
my @from_path = split(/[\\\/]/, $from);
my $pwd = getcwd();
chomp($pwd);
my @pwd_path = split(/[\\\/]/, $pwd);
my @to_path = ();
my $dirname;
foreach $dirname (@from_path) {
# In this loop, @to_path always is a relative path from
# @pwd_path (interpreted is an absolute path) to the original pwd.
# At the end, @from_path (as a relative path from the original pwd)
# designates the same directory as the absolute path @pwd_path,
# which means that @to_path then is a path from there to the original pwd.
next if ($dirname eq "" || $dirname eq ".");
if ($dirname eq "..") {
@to_path = (pop(@pwd_path), @to_path);
} else {
@to_path = ("..", @to_path);
push(@pwd_path, $dirname);
}
}
my $to = join('/', @to_path);
my $file;
$symlink_exists=eval {symlink("",""); 1};
foreach $file (@files) {
my $err = "";
if ($symlink_exists) {
unlink "$from/$file";
symlink("$to/$file", "$from/$file") or $err = " [$!]";
} else {
unlink "$from/$file";
open (OLD, "<$file") or die "Can't open $file: $!";
open (NEW, ">$from/$file") or die "Can't open $from/$file: $!";
binmode(OLD);
binmode(NEW);
while (<OLD>) {
print NEW $_;
}
close (OLD) or die "Can't close $file: $!";
close (NEW) or die "Can't close $from/$file: $!";
}
print $file . " => $from/$file$err\n";
}
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