git-svn: Teach dcommit --mergeinfo to handle multiple lines

"svn dcommit --mergeinfo" replaces the svn:mergeinfo property in an
upstream SVN repository with the given text. The svn:mergeinfo
property may contain commits originating on multiple branches,
separated by newlines.

Cause space characters in the mergeinfo to be replaced by newlines,
allowing a user to create history representing multiple branches being
merged into one.

Update the corresponding documentation and add a test for the new
functionality.

Signed-off-by: Bryan Jacobs <bjacobs@woti.com>
Acked-by: Sam Vilain <sam@vilain.net>
Acked-by: Eric Wong <normalperson@yhbt.net>

Documentation/git-svn.txt

@@ -222,8 +222,9 @@ discouraged.
 	Add the given merge information during the dcommit
 	(e.g. `--mergeinfo="/branches/foo:1-10"`). All svn server versions can
 	store this information (as a property), and svn clients starting from
-	version 1.5 can make use of it. 'git svn' currently does not use it
-	and does not set it automatically.
+	version 1.5 can make use of it. To specify merge information from multiple
+	branches, use a single space character between the branches
+	(`--mergeinfo="/branches/foo:1-10 /branches/bar:3,5-6,8"`)
 
 'branch'::
 	Create a branch in the SVN repository.

git-svn.perl

@@ -559,6 +559,9 @@ sub cmd_dcommit {
 	}
 	my $expect_url = $url;
 	Git::SVN::remove_username($expect_url);
+	if (defined($_merge_info)) {
+		$_merge_info =~ tr{ }{\n};
+	}
 	while (1) {
 		my $d = shift @$linear_refs or last;
 		unless (defined $last_rev) {

t/t9158-git-svn-mergeinfo.sh

@@ -38,4 +38,17 @@ test_expect_success 'verify svn:mergeinfo' '
 	test "$mergeinfo" = "/branches/foo:1-10"
 '
 
+test_expect_success 'change svn:mergeinfo multiline' '
+	touch baz &&
+	git add baz &&
+	git commit -m "baz" &&
+	git svn dcommit --mergeinfo="/branches/bar:1-10 /branches/other:3-5,8,10-11"
+'
+
+test_expect_success 'verify svn:mergeinfo multiline' '
+	mergeinfo=$(svn_cmd propget svn:mergeinfo "$svnrepo"/trunk)
+	test "$mergeinfo" = "/branches/bar:1-10
+/branches/other:3-5,8,10-11"
+'
+
 test_done