add stylus support

Signed-off-by: Timothée Peignier <timothee.peignier@tryphon.org>

docs/compilers.rst

@@ -88,6 +88,36 @@ To use it add this to your ``PIPELINE_COMPILERS`` ::
   Defaults to ``''``.
 
 
+Stylus compiler
+===============
+
+The Stylus compiler use `Stylus <http://learnboost.github.com/stylus/>`
+to compile your stylesheets.
+
+To use it add this to your ``PIPELINE_COMPILERS`` ::
+
+  PIPELINE_COMPILERS = (
+      'pipeline.compilers.stylus.StylusCompiler',
+  )
+
+
+``PIPELINE_STYLUS_BINARY``
+--------------------------
+
+  Command line to execute for stylus program.
+  You will most likely change this to the location of stylus on your system.
+ 
+  Defaults to ``'/usr/local/bin/stylus'``.
+
+``PIPELINE_STYLUS_ARGUMENTS``
+-----------------------------
+
+  Additional arguments to use when stylus is called.
+  
+  Defaults to ``''``.
+
+
+
 Write your own compiler class
 =============================
 

pipeline/compilers/stylus/__init__.py

+import os.path
+
+from pipeline.conf import settings
+from pipeline.compilers import SubProcessCompiler
+
+
+class StylusCompiler(SubProcessCompiler):
+    output_extension = 'css'
+
+    def match_file(self, filename):
+        return filename.endswith('.styl')
+
+    def compile_file(self, content, path):
+        command = "%s %s" % (
+            settings.PIPELINE_STYLUS_BINARY,
+            settings.PIPELINE_STYLUS_ARGUMENTS,
+        )
+        cwd = os.path.dirname(path)
+        return self.execute_command(command, content, cwd=cwd)

pipeline/conf/settings.py

@@ -54,6 +54,9 @@ PIPELINE_COFFEE_SCRIPT_ARGUMENTS = getattr(settings, 'PIPELINE_COFFEE_SCRIPT_ARG
 PIPELINE_SASS_BINARY = getattr(settings, 'PIPELINE_SASS_BINARY', '/usr/local/bin/sass')
 PIPELINE_SASS_ARGUMENTS = getattr(settings, 'PIPELINE_SASS_ARGUMENTS', '')
 
+PIPELINE_STYLUS_BINARY = getattr(settings, 'PIPELINE_STYLUS_BINARY', '/usr/local/bin/stylus')
+PIPELINE_STYLUS_ARGUMENTS = getattr(settings, 'PIPELINE_STYLUS_ARGUMENTS', '')
+
 PIPELINE_LESS_BINARY = getattr(settings, 'PIPELINE_LESS_BINARY', '/usr/local/bin/lessc')
 PIPELINE_LESS_ARGUMENTS = getattr(settings, 'PIPELINE_LESS_ARGUMENTS', '')