Added stemming support.

taggit/contrib/suggest/README.txt

@@ -4,17 +4,28 @@ taggit.contrib.suggest
 
 This add on module allows you to easily associate keywords and regular 
 expressions with a Tag object. This is useful to help keep your database
-getting filled up with several similar tags that really represent the same thing.
+getting filled up with several similar tags that really represent the same 
+thing.
 
 For example, if your site is a humor site you might want to collapse all of 
 #fun, #funny, #funnies, #hilarious, #rofl, and #lol into one tag #funny.  The
 suggest_tags() function in taggit.contrib.suggest.utils will give you a list
 of tags that seem appropriate for the text content given to it.  
 
+Usage
+=====
+
+Put 'taggit.contrib.suggest' into INSTALLED_APPS and run a syncdb to create 
+the necessary models.  This will add Keywords and Regular Expression inlines
+to the default django-taggit admin.  Once you've populated those based on your
+site you can do a simple: 
+
+from taggit.contrib.suggest.utils import suggest_tags 
+
+tags = suggest_tags(content='Some textual content...')
+
 TODO
 ====
 
-* Basic stemming of the keywords for you! Which will require the Python NLTK. 
-
 * In a later version I hope to a simple way to help determine keywords for you
 automatically, by learning from your past tags and content. 

taggit/contrib/suggest/models.py

@@ -4,15 +4,29 @@ from django.db import models
 from django.core.exceptions import ValidationError 
 from taggit.models import Tag 
 
+HAS_PYSTEMMER = True 
+try: 
+    import Stemmer
+except ImportError: 
+    HAS_PYSTEMMER = False 
 
 class TagKeyword(models.Model): 
     """ Model to associate simple keywords to a Tag """ 
     tag = models.ForeignKey(Tag, related_name='keywords')
     keyword = models.CharField(max_length=30)
+    stem = models.CharField(max_length=30)
 
     def __unicode__(self): 
         return "Keyword '%s' for Tag '%s'" % (self.keyword, self.tag.name)
 
+    def save(self, *args, **kwargs): 
+        """ Stem the keyword on save if they have PyStemmer """ 
+        language = kwargs.pop('stemmer-language', 'english')
+        if not self.id and not self.stem and HAS_PYSTEMMER: 
+            stemmer = Stemmer.Stemmer(language)
+            self.stem = stemmer.stemWord(self.keyword)
+        super(TagKeyword,self).save(*args,**kwargs)
+
 def validate_regexp(value): 
     """ Make sure we have a valid regular expression """ 
     try: 

taggit/contrib/suggest/utils.py

@@ -4,12 +4,6 @@ from taggit.contrib.suggest.models import TagKeyword, TagRegExp
 from django.conf import settings 
 
 
-HAS_NLTK = True 
-try: 
-    from nltk.stemmer.porter import PorterStemmer
-except ImportError: 
-    HAS_NLTK = False 
-
 def _suggest_keywords(content=None):
     """ Suggest by keywords """ 
     suggested_keywords = set()