git-svn: give show-ignore HEAD smarts, like dcommit and log
This allows the user to run git-svn show-ignore on there current HEAD without needing to remember which branch/ref they branched from with -i. Also, find_by_url should correctly handle cases where the URL passed to it is not valid. Signed-off-by: Eric Wong <normalperson@yhbt.net>
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		@ -425,7 +425,8 @@ sub cmd_rebase {
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}
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sub cmd_show_ignore {
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	my $gs = Git::SVN->new;
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	my $url = (::working_head_info('HEAD'))[0];
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	my $gs = Git::SVN->find_by_url($url) || Git::SVN->new;
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	my $r = (defined $_revision ? $_revision : $gs->ra->get_latest_revnum);
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	$gs->traverse_ignore(\*STDOUT, '', $r);
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}
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@ -1034,6 +1035,7 @@ sub init_remote_config {
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sub find_by_url { # repos_root and, path are optional
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	my ($class, $full_url, $repos_root, $path) = @_;
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	return undef unless defined $full_url;
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	my $remotes = read_all_remotes();
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	if (defined $full_url && defined $repos_root && !defined $path) {
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		$path = $full_url;
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