Implement LessCSSGenerator

pelican/generators.py

@@ -4,6 +4,7 @@ import math
 import random
 import logging
 import datetime
+import subprocess
 
 from collections import defaultdict
 from functools import partial
@@ -414,3 +415,38 @@ class PdfGenerator(Generator):
 
         for page in self.context['pages']:
             self._create_pdf(page, pdf_path)
+
+
+class LessCSSGenerator(Generator):
+    """Compile less css files. This assumes we have `lessc` in our PATH."""
+
+    def generate_context(self):
+        pass
+
+    def _compile(self, less_file, source_dir, dest_dir):
+        base = os.path.relpath(less_file, source_dir)
+        target = os.path.splitext(
+                os.path.join(self.output_path, base))[0] + '.css'
+        target_dir = os.path.dirname(target)
+
+        if not os.path.exists(target_dir):
+            try:
+                os.makedirs(target_dir)
+            except OSError:
+                logger.error("Couldn't create the pdf output folder in " +
+                        target_dir)
+                pass
+
+        cmd = ' '.join([self.settings['LESS_COMPILER'], less_file, target])
+        subprocess.call(cmd, shell=True)
+        logger.info(u' [ok] compiled %s' % base)
+
+    def generate_output(self, writer=None):
+        logger.info(u' Compiling less css')
+
+        for static_path in self.settings['STATIC_PATHS']:
+            for f in self.get_files(
+                    os.path.join(self.path, static_path),
+                    extensions=['less']):
+
+                self._compile(f, self.path, self.output_path)