Merge branch 'master' of github.com:fnp/wolnelektury

[wolnelektury.git] / apps / search / index.py

diff --git a/apps/search/index.py b/apps/search/index.py
index e59c38b..a0bf715 100644 (file)
--- a/apps/search/index.py
+++ b/apps/search/index.py
@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
 
 from django.conf import settings
 # -*- coding: utf-8 -*-
 
 from django.conf import settings

-from lucene import SimpleFSDirectory, IndexWriter, CheckIndex, \
+from django.dispatch import Signal
+from lucene import SimpleFSDirectory, NIOFSDirectory, IndexWriter, IndexReader, IndexWriterConfig, CheckIndex, \

     File, Field, Integer, \
     NumericField, Version, Document, JavaError, IndexSearcher, \
     QueryParser, PerFieldAnalyzerWrapper, \
     File, Field, Integer, \
     NumericField, Version, Document, JavaError, IndexSearcher, \
     QueryParser, PerFieldAnalyzerWrapper, \


@@ -17,7 +18,7 @@ from lucene import SimpleFSDirectory, IndexWriter, CheckIndex, \
     # KeywordAnalyzer
 
 # Initialize jvm
     # KeywordAnalyzer
 
 # Initialize jvm

-JVM = initVM(CLASSPATH)
+JVM = initVM(CLASSPATH, maxheap=settings.JVM_MAXHEAP)

 
 import sys
 import os
 
 import sys
 import os


@@ -25,12 +26,16 @@ import re
 import errno
 from librarian import dcparser
 from librarian.parser import WLDocument
 import errno
 from librarian import dcparser
 from librarian.parser import WLDocument

+from lxml import etree

 import catalogue.models
 import catalogue.models

+from pdcounter.models import Author as PDCounterAuthor, BookStub as PDCounterBook

 from multiprocessing.pool import ThreadPool
 from threading import current_thread
 from multiprocessing.pool import ThreadPool
 from threading import current_thread

+from itertools import chain

 import atexit
 import traceback
 import atexit
 import traceback

-
+import logging
+log = logging.getLogger('search')

 
 class WLAnalyzer(PerFieldAnalyzerWrapper):
     def __init__(self):
 
 class WLAnalyzer(PerFieldAnalyzerWrapper):
     def __init__(self):


@@ -80,7 +85,7 @@ class IndexStore(object):
     """
     def __init__(self):
         self.make_index_dir()
     """
     def __init__(self):
         self.make_index_dir()

-        self.store = SimpleFSDirectory(File(settings.SEARCH_INDEX))
+        self.store = NIOFSDirectory(File(settings.SEARCH_INDEX))

 
     def make_index_dir(self):
         try:
 
     def make_index_dir(self):
         try:


@@ -90,6 +95,9 @@ class IndexStore(object):
                 pass
             else: raise
 
                 pass
             else: raise
 

+    def close(self):
+        self.store.close()
+

 
 class IndexChecker(IndexStore):
     def __init__(self):
 
 class IndexChecker(IndexStore):
     def __init__(self):


@@ -109,7 +117,7 @@ class Snippets(object):
     """
     SNIPPET_DIR = "snippets"
 
     """
     SNIPPET_DIR = "snippets"
 

-    def __init__(self, book_id):
+    def __init__(self, book_id, revision=None):

         try:
             os.makedirs(os.path.join(settings.SEARCH_INDEX, self.SNIPPET_DIR))
         except OSError as exc:
         try:
             os.makedirs(os.path.join(settings.SEARCH_INDEX, self.SNIPPET_DIR))
         except OSError as exc:


@@ -117,15 +125,32 @@ class Snippets(object):
                 pass
             else: raise
         self.book_id = book_id
                 pass
             else: raise
         self.book_id = book_id

+        self.revision = revision

         self.file = None
 
         self.file = None
 

+    @property
+    def path(self):
+        if self.revision: fn = "%d.%d" % (self.book_id, self.revision)
+        else: fn = "%d" % self.book_id
+
+        return os.path.join(settings.SEARCH_INDEX, self.SNIPPET_DIR, fn)
+

     def open(self, mode='r'):
         """
         Open the snippet file. Call .close() afterwards.
         """
         if not 'b' in mode:
             mode += 'b'
     def open(self, mode='r'):
         """
         Open the snippet file. Call .close() afterwards.
         """
         if not 'b' in mode:
             mode += 'b'

-        self.file = open(os.path.join(settings.SEARCH_INDEX, self.SNIPPET_DIR, str(self.book_id)), mode)
+
+        if 'w' in mode:
+            if os.path.exists(self.path):
+                self.revision = 1
+                while True:
+                    if not os.path.exists(self.path):
+                        break
+                    self.revision += 1
+
+        self.file = open(self.path, mode)

         self.position = 0
         return self
 
         self.position = 0
         return self
 


@@ -154,6 +179,17 @@ class Snippets(object):
         """Close snippet file"""
         self.file.close()
 
         """Close snippet file"""
         self.file.close()
 

+    def remove(self):
+        self.revision = None
+        try:
+            os.unlink(self.path)
+            self.revision = 0
+            while True:
+                self.revision += 1
+                os.unlink(self.path)
+        except OSError:
+            pass
+

 
 class BaseIndex(IndexStore):
     """
 
 class BaseIndex(IndexStore):
     """


@@ -167,11 +203,13 @@ class BaseIndex(IndexStore):
             analyzer = WLAnalyzer()
         self.analyzer = analyzer
 
             analyzer = WLAnalyzer()
         self.analyzer = analyzer
 

-    def open(self, analyzer=None):
+    def open(self, timeout=None):

         if self.index:
             raise Exception("Index is already opened")
         if self.index:
             raise Exception("Index is already opened")

-        self.index = IndexWriter(self.store, self.analyzer,\
-                                 IndexWriter.MaxFieldLength.LIMITED)
+        conf = IndexWriterConfig(Version.LUCENE_34, self.analyzer)
+        if timeout:
+            conf.setWriteLockTimeout(long(timeout))
+        self.index = IndexWriter(self.store, conf)

         return self.index
 
     def optimize(self):
         return self.index
 
     def optimize(self):


@@ -181,11 +219,15 @@ class BaseIndex(IndexStore):
         try:
             self.index.optimize()
         except JavaError, je:
         try:
             self.index.optimize()
         except JavaError, je:

-            print "Error during optimize phase, check index: %s" % je
+            log.error("Error during optimize phase, check index: %s" % je)

 
         self.index.close()
         self.index = None
 
 
         self.index.close()
         self.index = None
 

+        index_changed.send_robust(self)
+
+        super(BaseIndex, self).close()
+

     def __enter__(self):
         self.open()
         return self
     def __enter__(self):
         self.open()
         return self


@@ -194,6 +236,9 @@ class BaseIndex(IndexStore):
         self.close()
 
 
         self.close()
 
 

+index_changed = Signal()
+
+

 class Index(BaseIndex):
     """
     Class indexing books.
 class Index(BaseIndex):
     """
     Class indexing books.


@@ -201,39 +246,92 @@ class Index(BaseIndex):
     def __init__(self, analyzer=None):
         super(Index, self).__init__(analyzer)
 
     def __init__(self, analyzer=None):
         super(Index, self).__init__(analyzer)
 

-    def index_tags(self):
+    def index_tags(self, *tags, **kw):

         """
         Re-index global tag list.
         Removes all tags from index, then index them again.
         Indexed fields include: id, name (with and without polish stems), category
         """
         """
         Re-index global tag list.
         Removes all tags from index, then index them again.
         Indexed fields include: id, name (with and without polish stems), category
         """

-        q = NumericRangeQuery.newIntRange("tag_id", 0, Integer.MAX_VALUE, True, True)
-        self.index.deleteDocuments(q)
+        remove_only = kw.get('remove_only', False)
+        # first, remove tags from index.
+        if tags:
+            q = BooleanQuery()
+            for tag in tags:
+                b_id_cat = BooleanQuery()

 
 

-        for tag in catalogue.models.Tag.objects.all():
-            doc = Document()
-            doc.add(NumericField("tag_id", Field.Store.YES, True).setIntValue(tag.id))
-            doc.add(Field("tag_name", tag.name, Field.Store.NO, Field.Index.ANALYZED))
-            doc.add(Field("tag_name_pl", tag.name, Field.Store.NO, Field.Index.ANALYZED))
-            doc.add(Field("tag_category", tag.category, Field.Store.NO, Field.Index.NOT_ANALYZED))
-            self.index.addDocument(doc)
+                q_id = NumericRangeQuery.newIntRange("tag_id", tag.id, tag.id, True, True)
+                b_id_cat.add(q_id, BooleanClause.Occur.MUST)
+
+                if isinstance(tag, PDCounterAuthor):
+                    q_cat = TermQuery(Term('tag_category', 'pd_author'))
+                elif isinstance(tag, PDCounterBook):
+                    q_cat = TermQuery(Term('tag_category', 'pd_book'))
+                else:
+                    q_cat = TermQuery(Term('tag_category', tag.category))
+                b_id_cat.add(q_cat, BooleanClause.Occur.MUST)
+
+                q.add(b_id_cat, BooleanClause.Occur.SHOULD)
+        else:  # all
+            q = NumericRangeQuery.newIntRange("tag_id", 0, Integer.MAX_VALUE, True, True)
+            self.index.deleteDocuments(q)
+
+        if not remove_only:
+            # then add them [all or just one passed]
+            if not tags:
+                tags = chain(catalogue.models.Tag.objects.exclude(category='set'), \
+                    PDCounterAuthor.objects.all(), \
+                    PDCounterBook.objects.all())
+
+            for tag in tags:
+                if isinstance(tag, PDCounterAuthor):
+                    doc = Document()
+                    doc.add(NumericField("tag_id", Field.Store.YES, True).setIntValue(int(tag.id)))
+                    doc.add(Field("tag_name", tag.name, Field.Store.NO, Field.Index.ANALYZED))
+                    doc.add(Field("tag_name_pl", tag.name, Field.Store.NO, Field.Index.ANALYZED))
+                    doc.add(Field("tag_category", 'pd_author', Field.Store.YES, Field.Index.NOT_ANALYZED))
+                    doc.add(Field("is_pdcounter", 'true', Field.Store.YES, Field.Index.NOT_ANALYZED))
+                    self.index.addDocument(doc)
+                elif isinstance(tag, PDCounterBook):
+                    doc = Document()
+                    doc.add(NumericField("tag_id", Field.Store.YES, True).setIntValue(int(tag.id)))
+                    doc.add(Field("tag_name", tag.title, Field.Store.NO, Field.Index.ANALYZED))
+                    doc.add(Field("tag_name_pl", tag.title, Field.Store.NO, Field.Index.ANALYZED))
+                    doc.add(Field("tag_category", 'pd_book', Field.Store.YES, Field.Index.NOT_ANALYZED))
+                    doc.add(Field("is_pdcounter", 'true', Field.Store.YES, Field.Index.NOT_ANALYZED))
+                    self.index.addDocument(doc)
+                else:
+                    doc = Document()
+                    doc.add(NumericField("tag_id", Field.Store.YES, True).setIntValue(int(tag.id)))
+                    doc.add(Field("tag_name", tag.name, Field.Store.NO, Field.Index.ANALYZED))
+                    doc.add(Field("tag_name_pl", tag.name, Field.Store.NO, Field.Index.ANALYZED))
+                    doc.add(Field("tag_category", tag.category, Field.Store.NO, Field.Index.NOT_ANALYZED))
+                    self.index.addDocument(doc)

 
     def create_book_doc(self, book):
         """
         Create a lucene document referring book id.
         """
         doc = Document()
 
     def create_book_doc(self, book):
         """
         Create a lucene document referring book id.
         """
         doc = Document()

-        doc.add(NumericField("book_id", Field.Store.YES, True).setIntValue(book.id))
+        doc.add(NumericField("book_id", Field.Store.YES, True).setIntValue(int(book.id)))

         if book.parent is not None:
         if book.parent is not None:

-            doc.add(NumericField("parent_id", Field.Store.YES, True).setIntValue(book.parent.id))
+            doc.add(NumericField("parent_id", Field.Store.YES, True).setIntValue(int(book.parent.id)))

         return doc
 
         return doc
 

-    def remove_book(self, book):
+    def remove_book(self, book_or_id, remove_snippets=True):

         """Removes a book from search index.
         book - Book instance."""
         """Removes a book from search index.
         book - Book instance."""

-        q = NumericRangeQuery.newIntRange("book_id", book.id, book.id, True, True)
+        if isinstance(book_or_id, catalogue.models.Book):
+            book_id = book_or_id.id
+        else:
+            book_id = book_or_id
+
+        q = NumericRangeQuery.newIntRange("book_id", book_id, book_id, True, True)

         self.index.deleteDocuments(q)
 
         self.index.deleteDocuments(q)
 

+        if remove_snippets:
+            snippets = Snippets(book_id)
+            snippets.remove()
+

     def index_book(self, book, book_info=None, overwrite=True):
         """
         Indexes the book.
     def index_book(self, book, book_info=None, overwrite=True):
         """
         Indexes the book.


@@ -241,21 +339,26 @@ class Index(BaseIndex):
         and calls self.index_content() to index the contents of the book.
         """
         if overwrite:
         and calls self.index_content() to index the contents of the book.
         """
         if overwrite:

-            self.remove_book(book)
+            # we don't remove snippets, since they might be still needed by
+            # threads using not reopened index
+            self.remove_book(book, remove_snippets=False)

 
         book_doc = self.create_book_doc(book)
 
         book_doc = self.create_book_doc(book)

-        meta_fields = self.extract_metadata(book, book_info)
+        meta_fields = self.extract_metadata(book, book_info, dc_only=['source_name', 'authors', 'title'])
+        # let's not index it - it's only used for extracting publish date
+        if 'source_name' in meta_fields:
+            del meta_fields['source_name']
+        

         for f in meta_fields.values():
             if isinstance(f, list) or isinstance(f, tuple):
                 for elem in f:
                     book_doc.add(elem)
             else:
                 book_doc.add(f)
         for f in meta_fields.values():
             if isinstance(f, list) or isinstance(f, tuple):
                 for elem in f:
                     book_doc.add(elem)
             else:
                 book_doc.add(f)

-

         self.index.addDocument(book_doc)
         del book_doc
 
         self.index.addDocument(book_doc)
         del book_doc
 

-        self.index_content(book, book_fields=[meta_fields['title'], meta_fields['authors']])
+        self.index_content(book, book_fields=[meta_fields['title'], meta_fields['authors'], meta_fields['published_date']])

 
     master_tags = [
         'opowiadanie',
 
     master_tags = [
         'opowiadanie',


@@ -263,12 +366,23 @@ class Index(BaseIndex):
         'dramat_wierszowany_l',
         'dramat_wierszowany_lp',
         'dramat_wspolczesny', 'liryka_l', 'liryka_lp',
         'dramat_wierszowany_l',
         'dramat_wierszowany_lp',
         'dramat_wspolczesny', 'liryka_l', 'liryka_lp',

-        'wywiad'
+        'wywiad',
+        ]
+
+    ignore_content_tags = [
+        'uwaga', 'extra',
+        'zastepnik_tekstu', 'sekcja_asterysk', 'separator_linia', 'zastepnik_wersu',
+        'didaskalia',
+        'naglowek_aktu', 'naglowek_sceny', 'naglowek_czesc',

         ]
 
         ]
 

-    skip_header_tags = ['autor_utworu', 'nazwa_utworu', 'dzielo_nadrzedne']
+    footnote_tags = ['pa', 'pt', 'pr', 'pe']

 
 

-    def extract_metadata(self, book, book_info=None):
+    skip_header_tags = ['autor_utworu', 'nazwa_utworu', 'dzielo_nadrzedne', '{http://www.w3.org/1999/02/22-rdf-syntax-ns#}RDF']
+
+    published_date_re = re.compile("([0-9]+)[\]. ]*$")
+
+    def extract_metadata(self, book, book_info=None, dc_only=None):

         """
         Extract metadata from book and returns a map of fields keyed by fieldname
         """
         """
         Extract metadata from book and returns a map of fields keyed by fieldname
         """


@@ -283,6 +397,8 @@ class Index(BaseIndex):
 
         # validator, name
         for field in dcparser.BookInfo.FIELDS:
 
         # validator, name
         for field in dcparser.BookInfo.FIELDS:

+            if dc_only and field.name not in dc_only:
+                continue

             if hasattr(book_info, field.name):
                 if not getattr(book_info, field.name):
                     continue
             if hasattr(book_info, field.name):
                 if not getattr(book_info, field.name):
                     continue


@@ -308,6 +424,15 @@ class Index(BaseIndex):
                     fields[field.name] = Field(field.name, "%04d%02d%02d" %\
                                                (dt.year, dt.month, dt.day), Field.Store.NO, Field.Index.NOT_ANALYZED)
 
                     fields[field.name] = Field(field.name, "%04d%02d%02d" %\
                                                (dt.year, dt.month, dt.day), Field.Store.NO, Field.Index.NOT_ANALYZED)
 

+        # get published date
+        pd = None
+        if hasattr(book_info, 'source_name') and book_info.source_name:
+            match = self.published_date_re.search(book_info.source_name)
+            if match is not None:
+                pd = str(match.groups()[0])
+        if not pd: pd = ""
+        fields["published_date"] = Field("published_date", pd, Field.Store.YES, Field.Index.NOT_ANALYZED)
+

         return fields
 
     def add_gaps(self, fields, fieldname):
         return fields
 
     def add_gaps(self, fields, fieldname):


@@ -340,15 +465,33 @@ class Index(BaseIndex):
         if master is None:
             return []
 
         if master is None:
             return []
 

-        def walker(node):
-            yield node, None
-            for child in list(node):
-                for b, e in walker(child):
-                    yield b, e
-            yield None, node
+        def walker(node, ignore_tags=[]):
+
+            if node.tag not in ignore_tags:
+                yield node, None, None
+                if node.text is not None:
+                    yield None, node.text, None
+                for child in list(node):
+                    for b, t, e in walker(child):
+                        yield b, t, e
+                yield None, None, node
+
+            if node.tail is not None:
+                yield None, node.tail, None

             return
 
         def fix_format(text):
             return
 
         def fix_format(text):

+            #            separator = [u" ", u"\t", u".", u";", u","]
+            if isinstance(text, list):
+                # need to join it first
+                text = filter(lambda s: s is not None, content)
+                text = u' '.join(text)
+                # for i in range(len(text)):
+                #     if i > 0:
+                #         if text[i][0] not in separator\
+                #             and text[i - 1][-1] not in separator:
+                #          text.insert(i, u" ")
+

             return re.sub("(?m)/$", "", text)
 
         def add_part(snippets, **fields):
             return re.sub("(?m)/$", "", text)
 
         def add_part(snippets, **fields):


@@ -367,6 +510,8 @@ class Index(BaseIndex):
             snip_pos = snippets.add(fields["content"])
             doc.add(NumericField("snippets_position", Field.Store.YES, True).setIntValue(snip_pos[0]))
             doc.add(NumericField("snippets_length", Field.Store.YES, True).setIntValue(snip_pos[1]))
             snip_pos = snippets.add(fields["content"])
             doc.add(NumericField("snippets_position", Field.Store.YES, True).setIntValue(snip_pos[0]))
             doc.add(NumericField("snippets_length", Field.Store.YES, True).setIntValue(snip_pos[1]))

+            if snippets.revision:
+                doc.add(NumericField("snippets_revision", Field.Store.YES, True).setIntValue(snippets.revision))

 
             if 'fragment_anchor' in fields:
                 doc.add(Field("fragment_anchor", fields['fragment_anchor'],
 
             if 'fragment_anchor' in fields:
                 doc.add(Field("fragment_anchor", fields['fragment_anchor'],


@@ -401,24 +546,51 @@ class Index(BaseIndex):
 
                 if header.tag in self.skip_header_tags:
                     continue
 
                 if header.tag in self.skip_header_tags:
                     continue

+                if header.tag is etree.Comment:
+                    continue

 
 

-                content = u' '.join([t for t in header.itertext()])
-                content = fix_format(content)
-
-                doc = add_part(snippets, header_index=position, header_type=header.tag, content=content)
-
-                self.index.addDocument(doc)
+                # section content
+                content = []
+                footnote = []
+
+                def all_content(text):
+                    for frag in fragments.values():
+                        frag['content'].append(text)
+                    content.append(text)
+                handle_text = [all_content]
+
+
+                for start, text, end in walker(header, ignore_tags=self.ignore_content_tags):
+                    # handle footnotes
+                    if start is not None and start.tag in self.footnote_tags:
+                        footnote = []
+                        def collect_footnote(t):
+                            footnote.append(t)
+                        handle_text.append(collect_footnote)
+                    elif end is not None and footnote is not [] and end.tag in self.footnote_tags:
+                        handle_text.pop()
+                        doc = add_part(snippets, header_index=position, header_type=header.tag,
+                                       content=u''.join(footnote),
+                                       is_footnote=Field("is_footnote", 'true', Field.Store.NO, Field.Index.NOT_ANALYZED))

                 
                 

-                for start, end in walker(header):
+                        self.index.addDocument(doc)
+                        #print "@ footnote text: %s" % footnote
+                        footnote = []
+                    
+                    # handle fragments and themes.

                     if start is not None and start.tag == 'begin':
                         fid = start.attrib['id'][1:]
                         fragments[fid] = {'content': [], 'themes': [], 'start_section': position, 'start_header': header.tag}
                     if start is not None and start.tag == 'begin':
                         fid = start.attrib['id'][1:]
                         fragments[fid] = {'content': [], 'themes': [], 'start_section': position, 'start_header': header.tag}

-                        fragments[fid]['content'].append(start.tail)
+
+                    # themes for this fragment

                     elif start is not None and start.tag == 'motyw':
                         fid = start.attrib['id'][1:]
                     elif start is not None and start.tag == 'motyw':
                         fid = start.attrib['id'][1:]

+                        handle_text.append(None)

                         if start.text is not None:
                             fragments[fid]['themes'] += map(str.strip, map(give_me_utf8, start.text.split(',')))
                         if start.text is not None:
                             fragments[fid]['themes'] += map(str.strip, map(give_me_utf8, start.text.split(',')))

-                        fragments[fid]['content'].append(start.tail)
+                    elif end is not None and end.tag == 'motyw':
+                        handle_text.pop()
+

                     elif start is not None and start.tag == 'end':
                         fid = start.attrib['id'][1:]
                         if fid not in fragments:
                     elif start is not None and start.tag == 'end':
                         fid = start.attrib['id'][1:]
                         if fid not in fragments:


@@ -428,26 +600,30 @@ class Index(BaseIndex):
                             continue  # empty themes list.
                         del fragments[fid]
 
                             continue  # empty themes list.
                         del fragments[fid]
 

-                        def jstr(l):
-                            return u' '.join(map(
-                                lambda x: x == None and u'(none)' or unicode(x),
-                                l))
-

                         doc = add_part(snippets,
                                        header_type=frag['start_header'],
                                        header_index=frag['start_section'],
                                        header_span=position - frag['start_section'] + 1,
                                        fragment_anchor=fid,
                         doc = add_part(snippets,
                                        header_type=frag['start_header'],
                                        header_index=frag['start_section'],
                                        header_span=position - frag['start_section'] + 1,
                                        fragment_anchor=fid,

-                                       content=u' '.join(filter(lambda s: s is not None, frag['content'])),
+                                       content=fix_format(frag['content']),

                                        themes=frag['themes'])
                                        themes=frag['themes'])

-
+                        #print '@ FRAG %s' % frag['content']

                         self.index.addDocument(doc)
                         self.index.addDocument(doc)

-                    elif start is not None:
-                        for frag in fragments.values():
-                            frag['content'].append(start.text)
-                    elif end is not None:
-                        for frag in fragments.values():
-                            frag['content'].append(end.tail)
+
+                        # Collect content.
+
+                    if text is not None and handle_text is not []:
+                        hdl = handle_text[-1]
+                        if hdl is not None:
+                            hdl(text)
+
+                        # in the end, add a section text.
+                doc = add_part(snippets, header_index=position, header_type=header.tag,
+                               content=fix_format(content))
+                #print '@ CONTENT: %s' % fix_format(content)
+
+                self.index.addDocument(doc)
+

         finally:
             snippets.close()
 
         finally:
             snippets.close()
 


@@ -457,7 +633,7 @@ def log_exception_wrapper(f):
         try:
             f(*a)
         except Exception, e:
         try:
             f(*a)
         except Exception, e:

-            print("Error in indexing thread: %s" % e)
+            log.error("Error in indexing thread: %s" % e)

             traceback.print_exc()
             raise e
     return _wrap
             traceback.print_exc()
             raise e
     return _wrap


@@ -473,12 +649,11 @@ class ReusableIndex(Index):
     """
     index = None
 
     """
     index = None
 

-    def open(self, analyzer=None, threads=4):
-        if ReusableIndex.index is not None:
+    def open(self, analyzer=None, **kw):
+        if ReusableIndex.index:

             self.index = ReusableIndex.index
         else:
             self.index = ReusableIndex.index
         else:

-            print("opening index")
-            Index.open(self, analyzer)
+            Index.open(self, analyzer, **kw)

             ReusableIndex.index = self.index
             atexit.register(ReusableIndex.close_reusable)
 
             ReusableIndex.index = self.index
             atexit.register(ReusableIndex.close_reusable)
 


@@ -488,13 +663,16 @@ class ReusableIndex(Index):
 
     @staticmethod
     def close_reusable():
 
     @staticmethod
     def close_reusable():

-        if ReusableIndex.index is not None:
+        if ReusableIndex.index:

             ReusableIndex.index.optimize()
             ReusableIndex.index.close()
             ReusableIndex.index = None
 
             ReusableIndex.index.optimize()
             ReusableIndex.index.close()
             ReusableIndex.index = None
 

+            index_changed.send_robust(None)
+

     def close(self):
     def close(self):

-        pass
+        if ReusableIndex.index:
+            ReusableIndex.index.commit()

 
 
 class JoinSearch(object):
 
 
 class JoinSearch(object):


@@ -541,48 +719,71 @@ class JoinSearch(object):
 
 
 class SearchResult(object):
 
 
 class SearchResult(object):

-    def __init__(self, searcher, scoreDocs, score=None, how_found=None, snippets=None):
+    def __init__(self, search, scoreDocs, score=None, how_found=None, snippets=None, searched=None, tokens_cache=None):
+        if tokens_cache is None: tokens_cache = {}
+

         if score:
         if score:

-            self.score = score
+            self._score = score

         else:
         else:

-            self.score = scoreDocs.score
+            self._score = scoreDocs.score
+
+        self.boost = 1.0

 
         self._hits = []
 
         self._hits = []

-        self.hits = None  # processed hits
+        self._processed_hits = None  # processed hits

 
 

-        stored = searcher.doc(scoreDocs.doc)
+        stored = search.searcher.doc(scoreDocs.doc)

         self.book_id = int(stored.get("book_id"))
 
         self.book_id = int(stored.get("book_id"))
 

+        pd = stored.get("published_date")
+        try:
+            self.published_date = int(pd)
+        except ValueError:
+            self.published_date = 0
+

         header_type = stored.get("header_type")
         header_type = stored.get("header_type")

-        if not header_type:
-            return
+        # we have a content hit in some header of fragment
+        if header_type is not None:
+            sec = (header_type, int(stored.get("header_index")))
+            header_span = stored.get('header_span')
+            header_span = header_span is not None and int(header_span) or 1

 
 

-        sec = (header_type, int(stored.get("header_index")))
-        header_span = stored.get('header_span')
-        header_span = header_span is not None and int(header_span) or 1
+            fragment = stored.get("fragment_anchor")

 
 

-        fragment = stored.get("fragment_anchor")
+            if snippets:
+                snippets = snippets.replace("/\n", "\n")
+            hit = (sec + (header_span,), fragment, scoreDocs.score, {'how_found': how_found, 'snippets': snippets and [snippets] or []})

 
 

-        if snippets:
-            snippets = snippets.replace("/\n", "\n")
-        hit = (sec + (header_span,), fragment, scoreDocs.score, {'how_found': how_found, 'snippets': snippets and [snippets] or []})
+            self._hits.append(hit)
+
+        self.search = search
+        self.searched = searched
+        self.tokens_cache = tokens_cache

 
 

-        self._hits.append(hit)
+    @property
+    def score(self):
+        return self._score * self.boost

 
     def merge(self, other):
         if self.book_id != other.book_id:
             raise ValueError("this search result is or book %d; tried to merge with %d" % (self.book_id, other.book_id))
         self._hits += other._hits
         if other.score > self.score:
 
     def merge(self, other):
         if self.book_id != other.book_id:
             raise ValueError("this search result is or book %d; tried to merge with %d" % (self.book_id, other.book_id))
         self._hits += other._hits
         if other.score > self.score:

-            self.score = other.score
+            self._score = other._score

         return self
 
     def get_book(self):
         return self
 
     def get_book(self):

+        if hasattr(self, '_book'):
+            return self._book

         return catalogue.models.Book.objects.get(id=self.book_id)
 
     book = property(get_book)
 
         return catalogue.models.Book.objects.get(id=self.book_id)
 
     book = property(get_book)
 

-    def process_hits(self):
+    @property
+    def hits(self):
+        if self._processed_hits is not None:
+            return self._processed_hits
+

         POSITION = 0
         FRAGMENT = 1
         POSITION_INDEX = 1
         POSITION = 0
         FRAGMENT = 1
         POSITION_INDEX = 1


@@ -592,7 +793,10 @@ class SearchResult(object):
 
         # to sections and fragments
         frags = filter(lambda r: r[FRAGMENT] is not None, self._hits)
 
         # to sections and fragments
         frags = filter(lambda r: r[FRAGMENT] is not None, self._hits)

+

         sect = filter(lambda r: r[FRAGMENT] is None, self._hits)
         sect = filter(lambda r: r[FRAGMENT] is None, self._hits)

+
+        # sections not covered by fragments

         sect = filter(lambda s: 0 == len(filter(
             lambda f: s[POSITION][POSITION_INDEX] >= f[POSITION][POSITION_INDEX]
             and s[POSITION][POSITION_INDEX] < f[POSITION][POSITION_INDEX] + f[POSITION][POSITION_SPAN],
         sect = filter(lambda s: 0 == len(filter(
             lambda f: s[POSITION][POSITION_INDEX] >= f[POSITION][POSITION_INDEX]
             and s[POSITION][POSITION_INDEX] < f[POSITION][POSITION_INDEX] + f[POSITION][POSITION_SPAN],


@@ -600,15 +804,20 @@ class SearchResult(object):
 
         hits = []
 
 
         hits = []
 

-        # remove duplicate fragments
-        fragments = {}
-        for f in frags:
-            fid = f[FRAGMENT]
-            if fid in fragments:
-                if fragments[fid][SCORE] >= f[SCORE]:
-                    continue
-            fragments[fid] = f
-        frags = fragments.values()
+        def remove_duplicates(lst, keyfn, compare):
+            els = {}
+            for e in lst:
+                eif = keyfn(e)
+                if eif in els:
+                    if compare(els[eif], e) >= 1:
+                        continue
+                els[eif] = e
+            return els.values()
+
+        # remove fragments with duplicated fid's and duplicated snippets
+        frags = remove_duplicates(frags, lambda f: f[FRAGMENT], lambda a, b: cmp(a[SCORE], b[SCORE]))
+        frags = remove_duplicates(frags, lambda f: f[OTHER]['snippets'] and f[OTHER]['snippets'][0] or f[FRAGMENT],
+                                  lambda a, b: cmp(a[SCORE], b[SCORE]))

 
         # remove duplicate sections
         sections = {}
 
         # remove duplicate sections
         sections = {}


@@ -629,20 +838,39 @@ class SearchResult(object):
         hits = sections.values()
 
         for f in frags:
         hits = sections.values()
 
         for f in frags:

-            frag = catalogue.models.Fragment.objects.get(anchor=f[FRAGMENT])
+            try:
+                frag = catalogue.models.Fragment.objects.get(anchor=f[FRAGMENT], book__id=self.book_id)
+            except catalogue.models.Fragment.DoesNotExist:
+                # stale index
+                continue
+
+            # Figure out if we were searching for a token matching some word in theme name.
+            themes = frag.tags.filter(category='theme')
+            themes_hit = []
+            if self.searched is not None:
+                tokens = self.search.get_tokens(self.searched, 'POLISH', cached=self.tokens_cache)
+                for theme in themes:
+                    name_tokens = self.search.get_tokens(theme.name, 'POLISH')
+                    for t in tokens:
+                        if t in name_tokens:
+                            if not theme in themes_hit:
+                                themes_hit.append(theme)
+                            break
+

             m = {'score': f[SCORE],
                  'fragment': frag,
                  'section_number': f[POSITION][POSITION_INDEX] + 1,
             m = {'score': f[SCORE],
                  'fragment': frag,
                  'section_number': f[POSITION][POSITION_INDEX] + 1,

-                 'themes': frag.tags.filter(category='theme')
+                 'themes': themes,
+                 'themes_hit': themes_hit

                  }
             m.update(f[OTHER])
             hits.append(m)
 
         hits.sort(lambda a, b: cmp(a['score'], b['score']), reverse=True)
 
                  }
             m.update(f[OTHER])
             hits.append(m)
 
         hits.sort(lambda a, b: cmp(a['score'], b['score']), reverse=True)
 

-        self.hits = hits
+        self._processed_hits = hits

 
 

-        return self
+        return hits

 
     def __unicode__(self):
         return u'SearchResult(book_id=%d, score=%d)' % (self.book_id, self.score)
 
     def __unicode__(self):
         return u'SearchResult(book_id=%d, score=%d)' % (self.book_id, self.score)


@@ -654,13 +882,17 @@ class SearchResult(object):
             for r in rl:
                 if r.book_id in books:
                     books[r.book_id].merge(r)
             for r in rl:
                 if r.book_id in books:
                     books[r.book_id].merge(r)

-                    #print(u"already have one with score %f, and this one has score %f" % (books[book.id][0], found.score))

                 else:
                     books[r.book_id] = r
         return books.values()
 
     def __cmp__(self, other):
                 else:
                     books[r.book_id] = r
         return books.values()
 
     def __cmp__(self, other):

-        return cmp(self.score, other.score)
+        c = cmp(self.score, other.score)
+        if c == 0:
+            # this is inverted, because earlier date is better
+            return cmp(other.published_date, self.published_date)
+        else:
+            return c

 
 
 class Hint(object):
 
 
 class Hint(object):


@@ -766,12 +998,31 @@ class Search(IndexStore):
         IndexStore.__init__(self)
         self.analyzer = WLAnalyzer()  # PolishAnalyzer(Version.LUCENE_34)
         # self.analyzer = WLAnalyzer()
         IndexStore.__init__(self)
         self.analyzer = WLAnalyzer()  # PolishAnalyzer(Version.LUCENE_34)
         # self.analyzer = WLAnalyzer()

-        self.searcher = IndexSearcher(self.store, True)
+        reader = IndexReader.open(self.store, True)
+        self.searcher = IndexSearcher(reader)

         self.parser = QueryParser(Version.LUCENE_34, default_field,
                                   self.analyzer)
 
         self.parent_filter = TermsFilter()
         self.parent_filter.addTerm(Term("is_book", "true"))
         self.parser = QueryParser(Version.LUCENE_34, default_field,
                                   self.analyzer)
 
         self.parent_filter = TermsFilter()
         self.parent_filter.addTerm(Term("is_book", "true"))

+        index_changed.connect(self.reopen)
+
+    def close(self):
+        reader = self.searcher.getIndexReader()
+        self.searcher.close()
+        reader.close()
+        super(Search, self).close()
+        index_changed.disconnect(self.reopen)
+
+    def reopen(self, **unused):
+        reader = self.searcher.getIndexReader()
+        rdr = reader.reopen()
+        if not rdr.equals(reader):
+            log.debug('Reopening index')
+            oldsearch = self.searcher
+            self.searcher = IndexSearcher(rdr)
+            oldsearch.close()
+            reader.close()

 
     def query(self, query):
         """Parse query in default Lucene Syntax. (for humans)
 
     def query(self, query):
         """Parse query in default Lucene Syntax. (for humans)


@@ -790,11 +1041,14 @@ class Search(IndexStore):
             bks.append(catalogue.models.Book.objects.get(id=doc.get("book_id")))
         return (bks, tops.totalHits)
 
             bks.append(catalogue.models.Book.objects.get(id=doc.get("book_id")))
         return (bks, tops.totalHits)
 

-    def get_tokens(self, searched, field='content'):
+    def get_tokens(self, searched, field='content', cached=None):

         """returns tokens analyzed by a proper (for a field) analyzer
         argument can be: StringReader, string/unicode, or tokens. In the last case
         they will just be returned (so we can reuse tokens, if we don't change the analyzer)
         """
         """returns tokens analyzed by a proper (for a field) analyzer
         argument can be: StringReader, string/unicode, or tokens. In the last case
         they will just be returned (so we can reuse tokens, if we don't change the analyzer)
         """

+        if cached is not None and field in cached:
+            return cached[field]
+

         if isinstance(searched, str) or isinstance(searched, unicode):
             searched = StringReader(searched)
         elif isinstance(searched, list):
         if isinstance(searched, str) or isinstance(searched, unicode):
             searched = StringReader(searched)
         elif isinstance(searched, list):


@@ -806,9 +1060,14 @@ class Search(IndexStore):
         while tokens.incrementToken():
             cta = tokens.getAttribute(CharTermAttribute.class_)
             toks.append(cta.toString())
         while tokens.incrementToken():
             cta = tokens.getAttribute(CharTermAttribute.class_)
             toks.append(cta.toString())

+
+        if cached is not None:
+            cached[field] = toks
+

         return toks
 
         return toks
 

-    def fuzziness(self, fuzzy):
+    @staticmethod
+    def fuzziness(fuzzy):

         """Helper method to sanitize fuzziness"""
         if not fuzzy:
             return None
         """Helper method to sanitize fuzziness"""
         if not fuzzy:
             return None


@@ -829,7 +1088,6 @@ class Search(IndexStore):
                 fuzzterms = []
 
                 while True:
                 fuzzterms = []
 
                 while True:

-                    #                    print("fuzz %s" % unicode(fuzzterm.term()).encode('utf-8'))

                     ft = fuzzterm.term()
                     if ft:
                         fuzzterms.append(ft)
                     ft = fuzzterm.term()
                     if ft:
                         fuzzterms.append(ft)


@@ -846,7 +1104,8 @@ class Search(IndexStore):
                 phrase.add(term)
         return phrase
 
                 phrase.add(term)
         return phrase
 

-    def make_term_query(self, tokens, field='content', modal=BooleanClause.Occur.SHOULD, fuzzy=False):
+    @staticmethod
+    def make_term_query(tokens, field='content', modal=BooleanClause.Occur.SHOULD, fuzzy=False):

         """
         Returns term queries joined by boolean query.
         modal - applies to boolean query
         """
         Returns term queries joined by boolean query.
         modal - applies to boolean query


@@ -862,9 +1121,40 @@ class Search(IndexStore):
             q.add(BooleanClause(term, modal))
         return q
 
             q.add(BooleanClause(term, modal))
         return q
 

-    # def content_query(self, query):
-    #     return BlockJoinQuery(query, self.parent_filter,
-    #                           BlockJoinQuery.ScoreMode.Total)
+    def search_phrase(self, searched, field, book=True, max_results=20, fuzzy=False,
+                      filters=None, tokens_cache=None, boost=None, snippets=False, slop=2):
+        if filters is None: filters = []
+        if tokens_cache is None: tokens_cache = {}
+
+        tokens = self.get_tokens(searched, field, cached=tokens_cache)
+
+        query = self.make_phrase(tokens, field=field, fuzzy=fuzzy, slop=slop)
+        if book:
+            filters.append(self.term_filter(Term('is_book', 'true')))
+        top = self.searcher.search(query, self.chain_filters(filters), max_results)
+
+        return [SearchResult(self, found, snippets=(snippets and self.get_snippets(found, query) or None), searched=searched) for found in top.scoreDocs]
+
+    def search_some(self, searched, fields, book=True, max_results=20, fuzzy=False,
+                    filters=None, tokens_cache=None, boost=None, snippets=True):
+        if filters is None: filters = []
+        if tokens_cache is None: tokens_cache = {}
+
+        if book:
+            filters.append(self.term_filter(Term('is_book', 'true')))
+
+        query = BooleanQuery()
+
+        for fld in fields:
+            tokens = self.get_tokens(searched, fld, cached=tokens_cache)
+
+            query.add(BooleanClause(self.make_term_query(tokens, field=fld,
+                                fuzzy=fuzzy), BooleanClause.Occur.SHOULD))
+
+        top = self.searcher.search(query, self.chain_filters(filters), max_results)
+
+        return [SearchResult(self, found, searched=searched, tokens_cache=tokens_cache,
+                             snippets=(snippets and self.get_snippets(found, query) or None)) for found in top.scoreDocs]

 
     def search_perfect_book(self, searched, max_results=20, fuzzy=False, hint=None):
         """
 
     def search_perfect_book(self, searched, max_results=20, fuzzy=False, hint=None):
         """


@@ -887,7 +1177,7 @@ class Search(IndexStore):
                 self.chain_filters([only_in, self.term_filter(Term('is_book', 'true'))]),
                 max_results)
             for found in top.scoreDocs:
                 self.chain_filters([only_in, self.term_filter(Term('is_book', 'true'))]),
                 max_results)
             for found in top.scoreDocs:

-                books.append(SearchResult(self.searcher, found, how_found="search_perfect_book"))
+                books.append(SearchResult(self, found, how_found="search_perfect_book"))

         return books
 
     def search_book(self, searched, max_results=20, fuzzy=False, hint=None):
         return books
 
     def search_book(self, searched, max_results=20, fuzzy=False, hint=None):


@@ -913,13 +1203,13 @@ class Search(IndexStore):
                                    self.chain_filters([only_in, self.term_filter(Term('is_book', 'true'))]),
             max_results)
         for found in top.scoreDocs:
                                    self.chain_filters([only_in, self.term_filter(Term('is_book', 'true'))]),
             max_results)
         for found in top.scoreDocs:

-            books.append(SearchResult(self.searcher, found, how_found="search_book"))
+            books.append(SearchResult(self, found, how_found="search_book"))

 
         return books
 
     def search_perfect_parts(self, searched, max_results=20, fuzzy=False, hint=None):
         """
 
         return books
 
     def search_perfect_parts(self, searched, max_results=20, fuzzy=False, hint=None):
         """

-        Search for book parts which containt a phrase perfectly matching (with a slop of 2, default for make_phrase())
+        Search for book parts which contains a phrase perfectly matching (with a slop of 2, default for make_phrase())

         some part/fragment of the book.
         """
         qrys = [self.make_phrase(self.get_tokens(searched), field=fld, fuzzy=fuzzy) for fld in ['content']]
         some part/fragment of the book.
         """
         qrys = [self.make_phrase(self.get_tokens(searched), field=fld, fuzzy=fuzzy) for fld in ['content']]


@@ -935,16 +1225,17 @@ class Search(IndexStore):
                                                            flt]),
                                        max_results)
             for found in top.scoreDocs:
                                                            flt]),
                                        max_results)
             for found in top.scoreDocs:

-                books.append(SearchResult(self.searcher, found, snippets=self.get_snippets(found, q), how_found='search_perfect_parts'))
+                books.append(SearchResult(self, found, snippets=self.get_snippets(found, q), how_found='search_perfect_parts'))

 
         return books
 
 
         return books
 

-    def search_everywhere(self, searched, max_results=20, fuzzy=False, hint=None):
+    def search_everywhere(self, searched, max_results=20, fuzzy=False, hint=None, tokens_cache=None):

         """
         Tries to use search terms to match different fields of book (or its parts).
         E.g. one word can be an author survey, another be a part of the title, and the rest
         are some words from third chapter.
         """
         """
         Tries to use search terms to match different fields of book (or its parts).
         E.g. one word can be an author survey, another be a part of the title, and the rest
         are some words from third chapter.
         """

+        if tokens_cache is None: tokens_cache = {}

         books = []
         only_in = None
 
         books = []
         only_in = None
 


@@ -954,8 +1245,8 @@ class Search(IndexStore):
         # content only query : themes x content
         q = BooleanQuery()
 
         # content only query : themes x content
         q = BooleanQuery()
 

-        tokens_pl = self.get_tokens(searched, field='content')
-        tokens = self.get_tokens(searched, field='SIMPLE')
+        tokens_pl = self.get_tokens(searched, field='content', cached=tokens_cache)
+        tokens = self.get_tokens(searched, field='SIMPLE', cached=tokens_cache)

 
         # only search in themes when we do not already filter by themes
         if hint is None or hint.just_search_in(['themes']) != []:
 
         # only search in themes when we do not already filter by themes
         if hint is None or hint.just_search_in(['themes']) != []:


@@ -967,8 +1258,7 @@ class Search(IndexStore):
 
         topDocs = self.searcher.search(q, only_in, max_results)
         for found in topDocs.scoreDocs:
 
         topDocs = self.searcher.search(q, only_in, max_results)
         for found in topDocs.scoreDocs:

-            books.append(SearchResult(self.searcher, found, how_found='search_everywhere_themesXcontent'))
-            print "* %s theme x content: %s" % (searched, books[-1]._hits)
+            books.append(SearchResult(self, found, how_found='search_everywhere_themesXcontent', searched=searched))

 
         # query themes/content x author/title/tags
         q = BooleanQuery()
 
         # query themes/content x author/title/tags
         q = BooleanQuery()


@@ -986,8 +1276,7 @@ class Search(IndexStore):
 
         topDocs = self.searcher.search(q, only_in, max_results)
         for found in topDocs.scoreDocs:
 
         topDocs = self.searcher.search(q, only_in, max_results)
         for found in topDocs.scoreDocs:

-            books.append(SearchResult(self.searcher, found, how_found='search_everywhere'))
-            print "* %s scatter search: %s" % (searched, books[-1]._hits)
+            books.append(SearchResult(self, found, how_found='search_everywhere', searched=searched))

 
         return books
 
 
         return books
 


@@ -1042,18 +1331,40 @@ class Search(IndexStore):
 
         stored = self.searcher.doc(scoreDoc.doc)
 
 
         stored = self.searcher.doc(scoreDoc.doc)
 

+        position = stored.get('snippets_position')
+        length = stored.get('snippets_length')
+        if position is None or length is None:
+            return None
+        revision = stored.get('snippets_revision')
+        if revision: revision = int(revision)
+

         # locate content.
         # locate content.

-        snippets = Snippets(stored.get('book_id')).open()
+        book_id = int(stored.get('book_id'))
+        snippets = Snippets(book_id, revision=revision)
+

         try:
         try:

-            text = snippets.get((int(stored.get('snippets_position')),
-                                 int(stored.get('snippets_length'))))
-        finally:
-            snippets.close()
+            snippets.open()
+        except IOError, e:
+            log.error("Cannot open snippet file for book id = %d [rev=%d], %s" % (book_id, revision, e))
+            return []
+
+        try:
+            try:
+                text = snippets.get((int(position),
+                                     int(length)))
+            finally:
+                snippets.close()

 
 

-        tokenStream = TokenSources.getAnyTokenStream(self.searcher.getIndexReader(), scoreDoc.doc, field, self.analyzer)
-        #  highlighter.getBestTextFragments(tokenStream, text, False, 10)
-        snip = highlighter.getBestFragments(tokenStream, text, 3, "...")
+            tokenStream = TokenSources.getAnyTokenStream(self.searcher.getIndexReader(), scoreDoc.doc, field, self.analyzer)
+            #  highlighter.getBestTextFragments(tokenStream, text, False, 10)
+            snip = highlighter.getBestFragments(tokenStream, text, 3, "...")

 
 

+        except Exception, e:
+            e2 = e
+            if hasattr(e, 'getJavaException'):
+                e2 = unicode(e.getJavaException())
+            raise Exception("Problem fetching snippets for book %d, @%d len=%d" % (book_id, int(position), int(length)),
+                e2)

         return snip
 
     @staticmethod
         return snip
 
     @staticmethod


@@ -1073,33 +1384,56 @@ class Search(IndexStore):
         if terms:
             return JArray('object')(terms, Term)
 
         if terms:
             return JArray('object')(terms, Term)
 

-    def search_tags(self, query, filter=None, max_results=40):
+    def search_tags(self, query, filt=None, max_results=40, pdcounter=False):

         """
         Search for Tag objects using query.
         """
         """
         Search for Tag objects using query.
         """

-        tops = self.searcher.search(query, filter, max_results)
+        if not pdcounter:
+            filters = self.chain_filters([filt, self.term_filter(Term('is_pdcounter', 'true'), inverse=True)])
+        tops = self.searcher.search(query, filt, max_results)

 
         tags = []
         for found in tops.scoreDocs:
             doc = self.searcher.doc(found.doc)
 
         tags = []
         for found in tops.scoreDocs:
             doc = self.searcher.doc(found.doc)

-            tag = catalogue.models.Tag.objects.get(id=doc.get("tag_id"))
-            tags.append(tag)
-            print "%s (%d) -> %f" % (tag, tag.id, found.score)
+            is_pdcounter = doc.get('is_pdcounter')
+            category = doc.get('tag_category')
+            try:
+                if is_pdcounter == 'true':
+                    if category == 'pd_author':
+                        tag = PDCounterAuthor.objects.get(id=doc.get('tag_id'))
+                    elif category == 'pd_book':
+                        tag = PDCounterBook.objects.get(id=doc.get('tag_id'))
+                        tag.category = 'pd_book'  # make it look more lik a tag.
+                    else:
+                        print "Warning. cannot get pdcounter tag_id=%d from db; cat=%s" % (int(doc.get('tag_id')), category)
+                else:
+                    tag = catalogue.models.Tag.objects.get(id=doc.get("tag_id"))
+                    # don't add the pdcounter tag if same tag already exists
+
+                tags.append(tag)
+
+            except catalogue.models.Tag.DoesNotExist: pass
+            except PDCounterAuthor.DoesNotExist: pass
+            except PDCounterBook.DoesNotExist: pass
+
+        log.debug('search_tags: %s' % tags)

 
         return tags
 
 
         return tags
 

-    def search_books(self, query, filter=None, max_results=10):
+    def search_books(self, query, filt=None, max_results=10):

         """
         Searches for Book objects using query
         """
         bks = []
         """
         Searches for Book objects using query
         """
         bks = []

-        tops = self.searcher.search(query, filter, max_results)
+        tops = self.searcher.search(query, filt, max_results)

         for found in tops.scoreDocs:
             doc = self.searcher.doc(found.doc)
         for found in tops.scoreDocs:
             doc = self.searcher.doc(found.doc)

-            bks.append(catalogue.models.Book.objects.get(id=doc.get("book_id")))
+            try:
+                bks.append(catalogue.models.Book.objects.get(id=doc.get("book_id")))
+            except catalogue.models.Book.DoesNotExist: pass

         return bks
 
         return bks
 

-    def create_prefix_phrase(self, toks, field):
+    def make_prefix_phrase(self, toks, field):

         q = MultiPhraseQuery()
         for i in range(len(toks)):
             t = Term(field, toks[i])
         q = MultiPhraseQuery()
         for i in range(len(toks)):
             t = Term(field, toks[i])


@@ -1125,7 +1459,7 @@ class Search(IndexStore):
 
         return only_term
 
 
         return only_term
 

-    def hint_tags(self, string, max_results=50):
+    def hint_tags(self, string, max_results=50, pdcounter=True, prefix=True, fuzzy=False):

         """
         Return auto-complete hints for tags
         using prefix search.
         """
         Return auto-complete hints for tags
         using prefix search.


@@ -1134,14 +1468,17 @@ class Search(IndexStore):
         top = BooleanQuery()
 
         for field in ['tag_name', 'tag_name_pl']:
         top = BooleanQuery()
 
         for field in ['tag_name', 'tag_name_pl']:

-            q = self.create_prefix_phrase(toks, field)
+            if prefix:
+                q = self.make_prefix_phrase(toks, field)
+            else:
+                q = self.make_term_query(toks, field, fuzzy=fuzzy)

             top.add(BooleanClause(q, BooleanClause.Occur.SHOULD))
 
         no_book_cat = self.term_filter(Term("tag_category", "book"), inverse=True)
 
             top.add(BooleanClause(q, BooleanClause.Occur.SHOULD))
 
         no_book_cat = self.term_filter(Term("tag_category", "book"), inverse=True)
 

-        return self.search_tags(top, no_book_cat, max_results=max_results)
+        return self.search_tags(top, no_book_cat, max_results=max_results, pdcounter=pdcounter)

 
 

-    def hint_books(self, string, max_results=50):
+    def hint_books(self, string, max_results=50, prefix=True, fuzzy=False):

         """
         Returns auto-complete hints for book titles
         Because we do not index 'pseudo' title-tags.
         """
         Returns auto-complete hints for book titles
         Because we do not index 'pseudo' title-tags.


@@ -1149,7 +1486,10 @@ class Search(IndexStore):
         """
         toks = self.get_tokens(string, field='SIMPLE')
 
         """
         toks = self.get_tokens(string, field='SIMPLE')
 

-        q = self.create_prefix_phrase(toks, 'title')
+        if prefix:
+            q = self.make_prefix_phrase(toks, 'title')
+        else:
+            q = self.make_term_query(toks, 'title', fuzzy=fuzzy)

 
         return self.search_books(q, self.term_filter(Term("is_book", "true")), max_results=max_results)
 
 
         return self.search_books(q, self.term_filter(Term("is_book", "true")), max_results=max_results)
 


@@ -1159,7 +1499,7 @@ class Search(IndexStore):
         Chains a filter list together
         """
         filters = filter(lambda x: x is not None, filters)
         Chains a filter list together
         """
         filters = filter(lambda x: x is not None, filters)

-        if not filters:
+        if not filters or filters is []:

             return None
         chf = ChainedFilter(JArray('object')(filters, Filter), op)
         return chf
             return None
         chf = ChainedFilter(JArray('object')(filters, Filter), op)
         return chf