From 50f2cd295f8da11218ecbdd4af7abdafdff2725e Mon Sep 17 00:00:00 2001
From: Meir Kriheli <mkriheli@gmail.com>
Date: Sun, 15 Apr 2012 02:20:20 +0300
Subject: [PATCH] Implement LessCSSGenerator

---
 pelican/__init__.py   |  4 +++-
 pelican/generators.py | 36 ++++++++++++++++++++++++++++++++++++
 pelican/settings.py   |  2 ++
 3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/pelican/__init__.py b/pelican/__init__.py
index c2766646..bb9819cd 100644
--- a/pelican/__init__.py
+++ b/pelican/__init__.py
@@ -6,7 +6,7 @@ import logging
 import argparse
 
 from pelican.generators import (ArticlesGenerator, PagesGenerator,
-        StaticGenerator, PdfGenerator)
+        StaticGenerator, PdfGenerator, LessCSSGenerator)
 from pelican.log import init
 from pelican.settings import read_settings, _DEFAULT_CONFIG
 from pelican.utils import clean_output_dir, files_changed
@@ -133,6 +133,8 @@ class Pelican(object):
         generators = [ArticlesGenerator, PagesGenerator, StaticGenerator]
         if self.settings['PDF_GENERATOR']:
             generators.append(PdfGenerator)
+        if self.settings['LESS_GENERATOR']:
+            generators.append(LessCSSGenerator)
         return generators
 
     def get_writer(self):
diff --git a/pelican/generators.py b/pelican/generators.py
index d7ebb0b0..5b90ad96 100644
--- a/pelican/generators.py
+++ b/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)
diff --git a/pelican/settings.py b/pelican/settings.py
index c0e30815..418634a0 100644
--- a/pelican/settings.py
+++ b/pelican/settings.py
@@ -67,6 +67,8 @@ _DEFAULT_CONFIG = {'PATH': '.',
                    'DEFAULT_STATUS': 'published',
                    'ARTICLE_PERMALINK_STRUCTURE': '',
                    'TYPOGRIFY': False,
+                   'LESS_GENERATOR': False,
+                   'LESS_COMPILER': '/usr/bin/lessc',
                    }