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| -rw-r--r-- | perl/Git/SVN/Utils.pm | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/perl/Git/SVN/Utils.pm b/perl/Git/SVN/Utils.pm new file mode 100644 index 0000000..5ca09ab --- /dev/null +++ b/perl/Git/SVN/Utils.pm @@ -0,0 +1,232 @@ +package Git::SVN::Utils; + +use strict; +use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : (); + +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; + $path =~ s#^\.$##; + 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; |