Added COMPRESS_VERSION_REMOVE_OLD setting to allow old versions of compressed…

Added COMPRESS_VERSION_REMOVE_OLD setting to allow old versions of compressed files to be preserved.

compress/conf/settings.py

@@ -6,6 +6,7 @@ COMPRESS_AUTO = getattr(settings, 'COMPRESS_AUTO', True)
 COMPRESS_VERSION = getattr(settings, 'COMPRESS_VERSION', False)
 COMPRESS_VERSION_PLACEHOLDER = getattr(settings, 'COMPRESS_VERSION_PLACEHOLDER', '?')
 COMPRESS_VERSION_DEFAULT = getattr(settings, 'COMPRESS_VERSION_DEFAULT', '0')
+COMPRESS_VERSION_REMOVE_OLD = getattr(settings, 'COMPRESS_VERSION_REMOVE_OLD', True)
 COMPRESS_VERSIONING = getattr(settings, 'COMPRESS_VERSIONING', 'compress.versioning.mtime.MTimeVersioning')
 
 COMPRESS_CSS_FILTERS = getattr(settings, 'COMPRESS_CSS_FILTERS', ['compress.filters.csstidy.CSSTidyFilter'])

compress/utils.py

@@ -120,7 +120,7 @@ def filter_common(obj, verbosity, filters, attr, separator, signal):
     
     filename = get_output_filename(obj['output_filename'], get_version(obj['source_filenames']))
 
-    if settings.COMPRESS_VERSION:
+    if settings.COMPRESS_VERSION and settings.COMPRESS_VERSION_REMOVE_OLD:
         remove_files(os.path.dirname(media_root(filename)), obj['output_filename'], verbosity)
 
     if verbosity >= 1:

docs/Configuration.textile

@@ -42,7 +42,8 @@ h3. Other settings
 
 * </tt>COMPRESS</tt>: When </tt>COMPRESS</tt> is </tt>True</tt>, CSS and JavaScripts will be concatenated and filtered. When </tt>False</tt>, the source-files will be used instead. Defaults to </tt>not DEBUG</tt> (compressed files will only be used in non-DEBUG-mode (production))
 * </tt>COMPRESS_AUTO</tt>: Auto-generate CSS and JavaScript files whenever needed, when the template tags are invoked. This setting will make sure that the outputted files always are up to date (assuming that you are using the provided templatetags to output the links to your files). If you disable this, you can use the management command to keep your files manually updated. Defaults to </tt>True</tt>.
-* </tt>COMPRESS_VERSION</tt>: regulates whether or not to add a "version number" to the outputted files filename with for use with “far future Expires”. For more information, see [FarFutureExpires]. When you specify </tt>COMPRESS_VERSION</tt> you will also need to add a placeholder (which by default is '?') for the version number in the </tt>output_filename</tt> setting. Files with new filenames will be generated if needed, and old outdated files will be removed at the same time. All files with a matching name e.g. </tt>output_filename</tt> where ? can be replaced by digits will be removed. If you for some reason have files named in the same way, you should consider moving them or putting the compressed files in their own directory.
+* </tt>COMPRESS_VERSION</tt>: Regulates whether or not to add a "version number" to the outputted files filename with for use with “far future Expires”. For more information, see [FarFutureExpires]. When you specify </tt>COMPRESS_VERSION</tt> you will also need to add a placeholder (which by default is '?') for the version number in the </tt>output_filename</tt> setting.
+* </tt>COMPRESS_VERSION_REMOVE_OLD</tt>: When </tt>True</tt>, old compressed files will be removed when new versions are generated. All files with a matching name e.g. </tt>output_filename</tt> where ? can be replaced by digits will be removed. If you for some reason have files named in the same way, you should consider moving them or putting the compressed files in their own directory. Defaults to </tt>True</tt>.
 
 </tt>COMPRESS_VERSION</tt> Example:
 <pre><code>
@@ -153,4 +154,4 @@ h4. YUI Compressor settings
 
 * </tt>COMPRESS_YUI_BINARY</tt>: command line to execute for the YUI program. Defaults to </tt>'java -jar yuicompressor.jar'</tt>. You will most likely change this to the location of yuicompressor on your system.
 * </tt>COMPRESS_YUI_CSS_ARGUMENTS</tt>: Additional arguments to use when compressing CSS. Defaults to </tt>''</tt>.
-* </tt>COMPRESS_YUI_JS_ARGUMENTS</tt>: Additional arguments to use when compressing JavaScript. Defaults to </tt>''</tt>.
\ No newline at end of file
+* </tt>COMPRESS_YUI_JS_ARGUMENTS</tt>: Additional arguments to use when compressing JavaScript. Defaults to </tt>''</tt>.