From 0d7d4cb142ecfe5c2cb0b9649fdecf106c4d9839 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gina=20H=C3=A4u=C3=9Fge?= <osd@foosel.net>
Date: Thu, 4 Jun 2015 09:06:04 +0200
Subject: [PATCH] Custom webassets filter that rewrites LESS imports

Need to point to ../less folder
---
 src/octoprint/server/__init__.py | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/octoprint/server/__init__.py b/src/octoprint/server/__init__.py
index c8707b39..115ed3f1 100644
--- a/src/octoprint/server/__init__.py
+++ b/src/octoprint/server/__init__.py
@@ -751,8 +751,29 @@ class Server():
 		css_libs_bundle = Bundle(*css_libs, output="webassets/packed_libs.css")
 		css_app_bundle = Bundle(*css_app, output="webassets/packed_app.css")
 
+		from webassets.filter import register_filter
+		from webassets.filter.cssrewrite.base import PatternRewriter
+		import re
+		class LessImportRewrite(PatternRewriter):
+			name = "less_importrewrite"
+
+			patterns = {
+				"import_rewrite": re.compile("(@import(\s+\(.*\))?\s+)\"(.*)\";")
+			}
+
+			def import_rewrite(self, m):
+				import_with_options = m.group(1)
+				import_url = m.group(3)
+
+				if not import_url.startswith("http:") and not import_url.startswith("https:") and not import_url.startswith("/"):
+					import_url = "../less/" + import_url
+
+				return "{import_with_options}\"{import_url}\";".format(**locals())
+
+		register_filter(LessImportRewrite)
+
 		all_css_bundle = Bundle(css_libs_bundle, css_app_bundle, output="webassets/packed.css")
-		all_less_bundle = Bundle(*less_app, output="webassets/packed.less")
+		all_less_bundle = Bundle(*less_app, output="webassets/packed.less", filters="less_importrewrite")
 
 		assets.register("all_js", all_js_bundle)
 		assets.register("all_css", all_css_bundle)