Set SASS numerical precision via LIBSASS_PRECISION

Added settings.LIBSASS_PRECISION, which accepts an int to change the
default precision for numbers. For example,

    # settings.py
    LIBSASS_PRECISION = 10

will increase the numerical precision to 10 digits, default being 5.

Author: ccwang002

CHANGELOG.txt

@@ -1,6 +1,10 @@
 Changelog
 =========
 
+0.7 (xx.xx.xxxx)
+~~~~~~~~~~~~~~~~
+ * Added LIBSASS_PRECISION setting (Liang-Bo Wang)
+
 0.6 (21.11.2015)
 ~~~~~~~~~~~~~~~~
  * Fixed call to FilterBase super for django-compressor 1.6 compatibility (Dennis Vermeulen)

README.rst

@@ -47,6 +47,7 @@ The following settings can be used to control django-libsass's behaviour:
 * ``LIBSASS_OUTPUT_STYLE`` - SASS output style. Options are ``'nested'``, ``'expanded'``, ``'compact'`` and ``'compressed'``, although as of libsass 3.0.2 only ``'nested'`` and ``'compressed'`` are implemented. Default is 'nested'. See `SASS documentation for output styles <http://sass-lang.com/documentation/file.SASS_REFERENCE.html#output_style>`_. Note that `django-compressor's settings <http://django-compressor.readthedocs.org/en/latest/settings/>`_ may also affect the formatting of the resulting CSS.
 * ``LIBSASS_CUSTOM_FUNCTIONS`` - A mapping of custom functions to be made available within the SASS compiler. By default, a ``static`` function is provided, analogous to Django's ``static`` template tag.
 * ``LIBSASS_SOURCEMAPS`` - Enable embedding sourcemaps into file output.
+* ``LIBSASS_PRECISION`` - Number of digits of numerical precision (default: 5)
 
 Custom functions
 ~~~~~~~~~~~~~~~~

django_libsass.py

@@ -23,6 +23,7 @@ def static(path):
 SOURCE_COMMENTS = getattr(settings, 'LIBSASS_SOURCE_COMMENTS', settings.DEBUG)
 CUSTOM_FUNCTIONS = getattr(settings, 'LIBSASS_CUSTOM_FUNCTIONS', {'static': static})
 SOURCEMAPS = getattr(settings, 'LIBSASS_SOURCEMAPS', False)
+PRECISION = getattr(settings, 'LIBSASS_PRECISION', None)  # None use libsass default
 
 
 INCLUDE_PATHS = None  # populate this on first call to 'get_include_paths'
@@ -102,6 +103,8 @@ def embed_sourcemap(output, sourcemap):
 def compile(**kwargs):
     """Perform sass.compile, but with the appropriate include_paths for Django added"""
     kwargs = kwargs.copy()
+    if PRECISION is not None:
+        kwargs['precision'] = PRECISION
     kwargs['include_paths'] = (kwargs.get('include_paths') or []) + get_include_paths()
 
     custom_functions = CUSTOM_FUNCTIONS.copy()