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package Git::SVN::Utils;
use strict;
use warnings;
use SVN::Core;
use base qw(Exporter);
our @EXPORT_OK = qw(
fatal
can_compress
canonicalize_path
canonicalize_url
join_paths
add_path_to_url
);
=head1 NAME
Git::SVN::Utils - utility functions used across Git::SVN
=head1 SYNOPSIS
use Git::SVN::Utils qw(functions to import);
=head1 DESCRIPTION
This module contains functions which are useful across many different
parts of Git::SVN. Mostly it's a place to put utility functions
rather than duplicate the code or have classes grabbing at other
classes.
=head1 FUNCTIONS
All functions can be imported only on request.
=head3 fatal
fatal(@message);
Display a message and exit with a fatal error code.
=cut
# Note: not certain why this is in use instead of die. Probably because
# the exit code of die is 255? Doesn't appear to be used consistently.
sub fatal (@) { print STDERR "@_\n"; exit 1 }
=head3 can_compress
my $can_compress = can_compress;
Returns true if Compress::Zlib is available, false otherwise.
=cut
my $can_compress;
sub can_compress {
return $can_compress if defined $can_compress;
return $can_compress = eval { require Compress::Zlib; };
}
=head3 canonicalize_path
my $canoncalized_path = canonicalize_path($path);
Converts $path into a canonical form which is safe to pass to the SVN
API as a file path.
=cut
# Turn foo/../bar into bar
sub _collapse_dotdot {
my $path = shift;
1 while $path =~ s{/[^/]+/+\.\.}{};
1 while $path =~ s{[^/]+/+\.\./}{};
1 while $path =~ s{[^/]+/+\.\.}{};
return $path;
}
sub canonicalize_path {
my $path = shift;
my $rv;
# The 1.7 way to do it
if ( defined &SVN::_Core::svn_dirent_canonicalize ) {
$path = _collapse_dotdot($path);
$rv = SVN::_Core::svn_dirent_canonicalize($path);
}
# The 1.6 way to do it
# This can return undef on subversion-perl-1.4.2-2.el5 (CentOS 5.2)
elsif ( defined &SVN::_Core::svn_path_canonicalize ) {
$path = _collapse_dotdot($path);
$rv = SVN::_Core::svn_path_canonicalize($path);
}
return $rv if defined $rv;
# No SVN API canonicalization is available, or the SVN API
# didn't return a successful result, do it ourselves
return _canonicalize_path_ourselves($path);
}
sub _canonicalize_path_ourselves {
my ($path) = @_;
my $dot_slash_added = 0;
if (substr($path, 0, 1) ne "/") {
$path = "./" . $path;
$dot_slash_added = 1;
}
$path =~ s#/+#/#g;
$path =~ s#/\.(?:/|$)#/#g;
$path = _collapse_dotdot($path);
$path =~ s#/$##g;
$path =~ s#^\./## if $dot_slash_added;
$path =~ s#^/##;
$path =~ s#^\.$##;
return $path;
}
=head3 canonicalize_url
my $canonicalized_url = canonicalize_url($url);
Converts $url into a canonical form which is safe to pass to the SVN
API as a URL.
=cut
sub canonicalize_url {
my $url = shift;
# The 1.7 way to do it
if ( defined &SVN::_Core::svn_uri_canonicalize ) {
return SVN::_Core::svn_uri_canonicalize($url);
}
# There wasn't a 1.6 way to do it, so we do it ourself.
else {
return _canonicalize_url_ourselves($url);
}
}
sub _canonicalize_url_path {
my ($uri_path) = @_;
my @parts;
foreach my $part (split m{/+}, $uri_path) {
$part =~ s/([^~\w.%+-]|%(?![a-fA-F0-9]{2}))/sprintf("%%%02X",ord($1))/eg;
push @parts, $part;
}
return join('/', @parts);
}
sub _canonicalize_url_ourselves {
my ($url) = @_;
if ($url =~ m#^([^:]+)://([^/]*)(.*)$#) {
my ($scheme, $domain, $uri) = ($1, $2, _canonicalize_url_path(canonicalize_path($3)));
$url = "$scheme://$domain$uri";
}
$url;
}
=head3 join_paths
my $new_path = join_paths(@paths);
Appends @paths together into a single path. Any empty paths are ignored.
=cut
sub join_paths {
my @paths = @_;
@paths = grep { defined $_ && length $_ } @paths;
return '' unless @paths;
return $paths[0] if @paths == 1;
my $new_path = shift @paths;
$new_path =~ s{/+$}{};
my $last_path = pop @paths;
$last_path =~ s{^/+}{};
for my $path (@paths) {
$path =~ s{^/+}{};
$path =~ s{/+$}{};
$new_path .= "/$path";
}
return $new_path .= "/$last_path";
}
=head3 add_path_to_url
my $new_url = add_path_to_url($url, $path);
Appends $path onto the $url. If $path is empty, $url is returned unchanged.
=cut
sub add_path_to_url {
my($url, $path) = @_;
return $url if !defined $path or !length $path;
# Strip trailing and leading slashes so we don't
# wind up with http://x.com///path
$url =~ s{/+$}{};
$path =~ s{^/+}{};
# If a path has a % in it, URI escape it so it's not
# mistaken for a URI escape later.
$path =~ s{%}{%25}g;
return join '/', $url, $path;
}
1;
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