From f0b65135c4a9d1b2a90ae446c27837b50ba6ba35 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 10 Oct 2014 13:25:31 +0300
Subject: [PATCH] Only get DataTransform directory contents when needed

---
 source/datatransform.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/source/datatransform.cpp b/source/datatransform.cpp
index 67b892e..31aaa37 100644
--- a/source/datatransform.cpp
+++ b/source/datatransform.cpp
@@ -28,15 +28,23 @@ void DataTransform::find_dependencies()
 	else
 	{
 		builder.get_logger().log("files", format("Reading imports from %s", path.str()));
-
-		list<string> dir_files = list_files(FS::dirname(path));
 		IO::File in(path.str());
 		DataFile::Parser parser(in, path.str());
+
+		list<string> dir_files;
 		while(!in.eof())
 		{
 			DataFile::Statement st = parser.parse();
 			if(st.keyword=="for_each")
 			{
+				// There's bound to be at least one file: the transform itself
+				if(dir_files.empty())
+				{
+					FS::Path dir = FS::dirname(path);
+					builder.get_logger().log("files", format("Traversing %s", dir.str()));
+					dir_files = list_files(dir);
+				}
+
 				for(DataFile::Statement::Arguments::const_iterator i=st.args.begin(); i!=st.args.end(); ++i)
 				{
 					Regex re(i->get<string>());
-- 
2.45.2