1 files changed, 74 insertions, 0 deletions
diff --git a/urpm/util.pm b/urpm/util.pm
new file mode 100644
index 00000000..cbfcb06b
--- /dev/null
+++ b/urpm/util.pm
@@ -0,0 +1,74 @@
+package urpm::util;
+
+use strict;
+use Exporter;
+our @ISA = 'Exporter';
+our @EXPORT = qw(quotespace unquotespace
+    remove_internal_name
+    reduce_pathname offset_pathname);
+
+#- quoting/unquoting a string that may be containing space chars.
+sub quotespace		 { my $x = $_[0] || ''; $x =~ s/(\s)/\\$1/g; $x }
+sub unquotespace	 { my $x = $_[0] || ''; $x =~ s/\\(\s)/$1/g; $x }
+sub remove_internal_name { my $x = $_[0] || ''; $x =~ s/\(\S+\)$/$1/g; $x }
+
+#- reduce pathname by removing <something>/.. each time it appears (or . too).
+sub reduce_pathname {
+    my ($url) = @_;
+
+    #- clean url to remove any macro (which cannot be solved now).
+    #- take care if this is a true url and not a simple pathname.
+    my ($host, $dir) = $url =~ m|([^:/]*://[^/]*/)?(.*)|;
+
+    #- remove any multiple /s or trailing /.
+    #- then split all components of pathname.
+    $dir =~ s|/+|/|g; $dir =~ s|/$||;
+    my @paths = split '/', $dir;
+
+    #- reset $dir, recompose it, and clean trailing / added by algorithm.
+    $dir = '';
+    foreach (@paths) {
+	if ($_ eq '..') {
+	    if ($dir =~ s|([^/]+)/$||) {
+		if ($1 eq '..') {
+		    $dir .= "../../";
+		}
+	    } else {
+		$dir .= "../";
+	    }
+	} elsif ($_ ne '.') {
+	    $dir .= "$_/";
+	}
+    }
+    $dir =~ s|/$||;
+    $dir ||= '/';
+
+    $host . $dir;
+}
+
+#- offset pathname by returning the right things to add to a relative directory
+#- to make no change. url is needed to resolve going before to top base.
+sub offset_pathname {
+    my ($url, $offset) = map { reduce_pathname($_) } @_;
+
+    #- clean url to remove any macro (which cannot be solved now).
+    #- take care if this is a true url and not a simple pathname.
+    my (undef, $dir) = $url =~ m|([^:/]*://[^/]*/)?(.*)|;
+    my @paths = split '/', $dir;
+    my @offpaths = reverse split '/', $offset;
+    my @corrections;
+    my $result = '';
+
+    foreach (@offpaths) {
+	if ($_ eq '..') {
+	    push @corrections, pop @paths;
+	} else {
+	    $result .= '../';
+	}
+    }
+    $result . join('/', reverse @corrections);
+}
+
+1;
+
+__END__