Fix #2581: The search doesn't work if language="es" (spanish)

CHANGES

@@ -68,6 +68,7 @@ Bugs fixed
 * #2576: ``sphinx.ext.imgmath`` crashes if subprocess raises error
 * #2577: ``sphinx.ext.imgmath``: Invalid argument are passed to dvisvgm
 * #2556: Xapian search does not work with Python 3
+* #2581: The search doesn't work if language="es" (spanish)
 
 
 Release 1.4.1 (released Apr 12, 2016)

sphinx/search/__init__.py

@@ -362,7 +362,7 @@ class IndexBuilder(object):
             try:
                 return self._stem_cache[word]
             except KeyError:
-                self._stem_cache[word] = self.lang.stem(word)
+                self._stem_cache[word] = self.lang.stem(word).lower()
                 return self._stem_cache[word]
         _filter = self.lang.word_filter
 

sphinx/search/de.py

@@ -311,5 +311,4 @@ class SearchGerman(SearchLanguage):
         self.stemmer = snowballstemmer.stemmer('german')
 
     def stem(self, word):
-        word = word.lower()
         return self.stemmer.stemWord(word)

sphinx/search/en.py

@@ -237,7 +237,6 @@ class SearchEnglish(SearchLanguage):
                 make at least the stem method nicer.
                 """
                 def stem(self, word):
-                    word = word.lower()
                     return PorterStemmer.stem(self, word, 0, len(word) - 1)
 
         self.stemmer = Stemmer()

sphinx/search/ja.py

@@ -556,4 +556,4 @@ class SearchJapanese(SearchLanguage):
         return len(stemmed_word) > 1
 
     def stem(self, word):
-        return word.lower()
+        return word

sphinx/search/zh.py

@@ -256,7 +256,6 @@ class SearchChinese(SearchLanguage):
                 make at least the stem method nicer.
                 """
                 def stem(self, word):
-                    word = word.lower()
                     return PorterStemmer.stem(self, word, 0, len(word) - 1)
 
         self.stemmer = Stemmer()