git-svn: use svn:global-ignores to create .gitignore

`svn:global-ignores` contains a list of file patterns that should
not be tracked in version control. The syntax of these patterns is
the same as `svn:ignore`. Their semantics differ: patterns in
`svn:global-ignores` apply to all paths under the directory where
they apply, while `svn:ignore` only applies to the directory's
immediate children.

Signed-off-by: Alex Galvin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: av-gal

git-svn.perl

@@ -1279,12 +1279,20 @@ sub cmd_show_ignore {
 	$gs->prop_walk($gs->path, $r, sub {
 		my ($gs, $path, $props) = @_;
 		print STDOUT "\n# $path\n";
-		my $s = $props->{'svn:ignore'} or return;
-		$s =~ s/[\r\n]+/\n/g;
-		$s =~ s/^\n+//;
-		chomp $s;
-		$s =~ s#^#$path#gm;
-		print STDOUT "$s\n";
+		if (my $s = $props->{'svn:ignore'}) {
+			$s =~ s/[\r\n]+/\n/g;
+			$s =~ s/^\n+//;
+			chomp $s;
+			$s =~ s#^#$path#gm;
+			print STDOUT "$s\n";
+		}
+		if (my $s = $props->{'svn:global-ignores'}) {
+			$s =~ s/[\r\n]+/\n/g;
+			$s =~ s/^\n+//;
+			chomp $s;
+			$s =~ s#^#$path**/#gm;
+			print STDOUT "$s\n";
+		}
 	});
 }
 
@@ -1315,16 +1323,25 @@ sub cmd_create_ignore {
 		# which git won't track
 		mkpath([$path]) unless -d $path;
 		my $ignore = $path . '.gitignore';
-		my $s = $props->{'svn:ignore'} or return;
 		open(GITIGNORE, '>', $ignore)
 		  or fatal("Failed to open `$ignore' for writing: $!");
-		$s =~ s/[\r\n]+/\n/g;
-		$s =~ s/^\n+//;
-		chomp $s;
-		# Prefix all patterns so that the ignore doesn't apply
-		# to sub-directories.
-		$s =~ s#^#/#gm;
-		print GITIGNORE "$s\n";
+		if (my $s = $props->{'svn:ignore'}) {
+			$s =~ s/[\r\n]+/\n/g;
+			$s =~ s/^\n+//;
+			chomp $s;
+			# Prefix all patterns so that the ignore doesn't apply
+			# to sub-directories.
+			$s =~ s#^#/#gm;
+			print GITIGNORE "$s\n";
+		}
+		if (my $s = $props->{'svn:global-ignores'}) {
+			$s =~ s/[\r\n]+/\n/g;
+			$s =~ s/^\n+//;
+			chomp $s;
+			# Global ignores apply to sub-directories, so they are
+			# not prefixed.
+			print GITIGNORE "$s\n";
+		}
 		close(GITIGNORE)
 		  or fatal("Failed to close `$ignore': $!");
 		command_noisy('add', '-f', $ignore);