From 9267bb6f2e39c9242604ee44482869b49dfb31bb Mon Sep 17 00:00:00 2001
From: Jannis Leidel <jannis@leidel.info>
Date: Mon, 18 Apr 2011 11:24:57 +0200
Subject: [PATCH] Stop overwriting the CompileFilter's options attribute in the
 __init__ method. Added optional test for the CSSTidy filter. Fixes issue #33.

---
 compressor/filters/base.py   |  5 +++--
 compressor/tests/tests.py    | 18 +++++++++++++++++-
 compressor/utils/__init__.py | 29 +++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/compressor/filters/base.py b/compressor/filters/base.py
index bfcc016..3c1a9ca 100644
--- a/compressor/filters/base.py
+++ b/compressor/filters/base.py
@@ -31,14 +31,15 @@ class CompilerFilter(FilterBase):
     external commands.
     """
     command = None
+    options = {}
 
-    def __init__(self, content, filter_type=None, verbose=0, command=None):
+    def __init__(self, content, filter_type=None, verbose=0, command=None, **kwargs):
         super(CompilerFilter, self).__init__(content, filter_type, verbose)
         if command:
             self.command = command
+        self.options.update(kwargs)
         if self.command is None:
             raise FilterError("Required command attribute not set")
-        self.options = {}
         self.stdout = subprocess.PIPE
         self.stdin = subprocess.PIPE
         self.stderr = subprocess.PIPE
diff --git a/compressor/tests/tests.py b/compressor/tests/tests.py
index 5fdcbd3..9e9580d 100644
--- a/compressor/tests/tests.py
+++ b/compressor/tests/tests.py
@@ -19,7 +19,7 @@ from compressor.conf import settings
 from compressor.css import CssCompressor
 from compressor.js import JsCompressor
 from compressor.management.commands.compress import Command as CompressCommand
-
+from compressor.utils import find_command
 
 class CompressorTestCase(TestCase):
 
@@ -419,3 +419,19 @@ class OfflineGenerationTestCase(TestCase):
             u'<script type="text/javascript" src="/media/CACHE/js/bf53fa5b13e2.js" charset="utf-8"></script>',
         ], result)
         settings.COMPRESS_OFFLINE_CONTEXT = self._old_offline_context
+
+
+if find_command(settings.COMPRESS_CSSTIDY_BINARY):
+
+    class CssTidyTestCase(TestCase):
+
+        def test_tidy(self):
+            content = """
+/* Some comment */
+font,th,td,p{
+    color: black;
+}
+"""
+            from compressor.filters.csstidy import CSSTidyFilter
+            self.assertEqual(
+                "font,th,td,p{color:#000;}", CSSTidyFilter(content).output())
diff --git a/compressor/utils/__init__.py b/compressor/utils/__init__.py
index 2c13265..699e37d 100644
--- a/compressor/utils/__init__.py
+++ b/compressor/utils/__init__.py
@@ -57,3 +57,32 @@ def walk(root, topdown=True, onerror=None, followlinks=False):
                 if os.path.islink(p):
                     for link_dirpath, link_dirnames, link_filenames in walk(p):
                         yield (link_dirpath, link_dirnames, link_filenames)
+
+
+def find_command(cmd, paths=None, pathext=None):
+    """
+    Searches the PATH for the given command and returns its path
+    """
+    if paths is None:
+        paths = os.environ.get('PATH', []).split(os.pathsep)
+    if isinstance(paths, basestring):
+        paths = [paths]
+    # check if there are funny path extensions for executables, e.g. Windows
+    if pathext is None:
+        pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD')
+    pathext = [ext for ext in pathext.lower().split(os.pathsep)]
+    # don't use extensions if the command ends with one of them
+    if os.path.splitext(cmd)[1].lower() in pathext:
+        pathext = ['']
+    # check if we find the command on PATH
+    for path in paths:
+        # try without extension first
+        cmd_path = os.path.join(path, cmd)
+        for ext in pathext:
+            # then including the extension
+            cmd_path_ext = cmd_path + ext
+            if os.path.isfile(cmd_path_ext):
+                return cmd_path_ext
+        if os.path.isfile(cmd_path):
+            return cmd_path
+    return None