git-svn: ignore leading blank lines in svn:ignore

Subversion ignores all blank lines in svn:ignore properties.  The old
git-svn code ignored blank lines everywhere except for the first line
of the svn:ignore property.  This patch makes the "git svn
show-ignore" and "git svn create-ignore" commands ignore leading blank
lines, too.

Also include leading blank lines in the test suite.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Acked-by: Eric Wong <normalperson@yhbt.net>

git-svn.perl

@@ -764,6 +764,7 @@ sub cmd_show_ignore {
 		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";
@@ -801,6 +802,7 @@ sub cmd_create_ignore {
 		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.

t/t9101-git-svn-props.sh

@@ -142,7 +142,9 @@ test_expect_success 'test show-ignore' "
 	touch deeply/nested/directory/.keep &&
 	svn_cmd add deeply &&
 	svn_cmd up &&
-	svn_cmd propset -R svn:ignore 'no-such-file*' .
+	svn_cmd propset -R svn:ignore '
+no-such-file*
+' .
 	svn_cmd commit -m 'propset svn:ignore'
 	cd .. &&
 	git svn show-ignore > show-ignore.got &&
@@ -171,6 +173,7 @@ test_expect_success 'test create-ignore' "
 	"
 
 cat >prop.expect <<\EOF
+
 no-such-file*
 
 EOF