Implement remove_formats()

src/calibre/db/backend.py

@@ -26,7 +26,7 @@ from calibre.utils.date import utcfromtimestamp, parse_date
 from calibre.utils.filenames import (is_case_sensitive, samefile, hardlink_file, ascii_filename,
                                      WindowsAtomicFolderMove)
 from calibre.utils.magick.draw import save_cover_data_to
-from calibre.utils.recycle_bin import delete_tree
+from calibre.utils.recycle_bin import delete_tree, delete_file
 from calibre.db.tables import (OneToOneTable, ManyToOneTable, ManyToManyTable,
         SizeTable, FormatsTable, AuthorsTable, IdentifiersTable, PathTable,
         CompositeTable, LanguagesTable, UUIDTable)
@@ -940,6 +940,15 @@ class DB(object):
     def has_format(self, book_id, fmt, fname, path):
         return self.format_abspath(book_id, fmt, fname, path) is not None
 
+    def remove_format(self, book_id, fmt, fname, path):
+        path = self.format_abspath(book_id, fmt, fname, path)
+        if path is not None:
+            try:
+                delete_file(path)
+            except:
+                import traceback
+                traceback.print_exc()
+
     def copy_cover_to(self, path, dest, windows_atomic_move=None, use_hardlink=False):
         path = os.path.abspath(os.path.join(self.library_path, path, 'cover.jpg'))
         if windows_atomic_move is not None:

src/calibre/db/cache.py

@@ -984,7 +984,7 @@ class Cache(object):
         del stream
 
         max_size = self.fields['formats'].table.update_fmt(book_id, fmt, fname, size, self.backend)
-        self.fields['size'].table.update_size(book_id, max_size)
+        self.fields['size'].table.update_sizes({book_id: max_size})
         self._update_last_modified((book_id,))
 
         if run_hooks:
@@ -994,6 +994,33 @@ class Cache(object):
 
         return True
 
+    @write_api
+    def remove_formats(self, formats_map, db_only=False):
+        table = self.fields['formats'].table
+        formats_map = {book_id:frozenset((f or '').upper() for f in fmts) for book_id, fmts in formats_map.iteritems()}
+        size_map = table.remove_formats(formats_map, self.backend)
+        self.fields['size'].table.update_sizes(size_map)
+
+        for book_id, fmts in formats_map.iteritems():
+            for fmt in fmts:
+                self.format_metadata_cache[book_id].pop(fmt, None)
+
+        if not db_only:
+            for book_id, fmts in formats_map.iteritems():
+                try:
+                    path = self._field_for('path', book_id).replace('/', os.sep)
+                except:
+                    continue
+                for fmt in fmts:
+                    try:
+                        name = self.fields['formats'].format_fname(book_id, fmt)
+                    except:
+                        continue
+                    if name and path:
+                        self.backend.remove_format(book_id, fmt, name, path)
+
+        self._update_last_modified(tuple(formats_map.iterkeys()))
+
     # }}}
 
 class SortKey(object):  # {{{

src/calibre/db/tables.py

@@ -99,8 +99,8 @@ class SizeTable(OneToOneTable):
                 'WHERE data.book=books.id) FROM books'):
             self.book_col_map[row[0]] = self.unserialize(row[1])
 
-    def update_size(self, book_id, size):
-        self.book_col_map[book_id] = size
+    def update_sizes(self, size_map):
+        self.book_col_map.update(size_map)
 
 class UUIDTable(OneToOneTable):
 
@@ -220,6 +220,26 @@ class FormatsTable(ManyToManyTable):
         db.conn.execute('UPDATE data SET name=? WHERE book=? AND format=?',
                         (fname, book_id, fmt))
 
+    def remove_formats(self, formats_map, db):
+        for book_id, fmts in formats_map.iteritems():
+            self.book_col_map[book_id] = [fmt for fmt in self.book_col_map.get(book_id, []) if fmt not in fmts]
+            for m in (self.fname_map, self.size_map):
+                m[book_id] = {k:v for k, v in m[book_id].iteritems() if k not in fmts}
+            for fmt in fmts:
+                try:
+                    self.col_book_map[fmt].discard(book_id)
+                except KeyError:
+                    pass
+        db.conn.executemany('DELETE FROM data WHERE book=? AND format=?',
+            [(book_id, fmt) for book_id, fmts in formats_map.iteritems() for fmt in fmts])
+        def zero_max(book_id):
+            try:
+                return max(self.size_map[book_id].itervalues())
+            except ValueError:
+                return 0
+
+        return {book_id:zero_max(book_id) for book_id in formats_map}
+
     def update_fmt(self, book_id, fmt, fname, size, db):
         fmts = list(self.book_col_map.get(book_id, []))
         try:
@@ -259,3 +279,4 @@ class LanguagesTable(ManyToManyTable):
 
     def read_id_maps(self, db):
         ManyToManyTable.read_id_maps(self, db)
+

src/calibre/db/tests/add_remove.py

@@ -7,6 +7,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
+import os
 from io import BytesIO
 from tempfile import NamedTemporaryFile
 
@@ -98,4 +99,43 @@ class AddRemoveTest(BaseTest):
 
     # }}}
 
+    def test_remove_formats(self):  # {{{
+        'Test removal of formats from book records'
+        af, ae, at = self.assertFalse, self.assertEqual, self.assertTrue
+
+        cache = self.init_cache()
+
+        # Test removal of non-existing format does nothing
+        formats = {bid:tuple(cache.formats(bid)) for bid in (1, 2, 3)}
+        cache.remove_formats({1:{'NF'}, 2:{'NF'}, 3:{'NF'}})
+        nformats = {bid:tuple(cache.formats(bid)) for bid in (1, 2, 3)}
+        ae(formats, nformats)
+
+        # Test full removal of format
+        af(cache.format(1, 'FMT1') is None)
+        at(cache.has_format(1, 'FMT1'))
+        cache.remove_formats({1:{'FMT1'}})
+        at(cache.format(1, 'FMT1') is None)
+        af(bool(cache.format_metadata(1, 'FMT1')))
+        af(bool(cache.format_metadata(1, 'FMT1', allow_cache=False)))
+        af('FMT1' in cache.formats(1))
+        af(cache.has_format(1, 'FMT1'))
+
+        # Test db only removal
+        at(cache.has_format(1, 'FMT2'))
+        ap = cache.format_abspath(1, 'FMT2')
+        if ap and os.path.exists(ap):
+            cache.remove_formats({1:{'FMT2'}})
+            af(bool(cache.format_metadata(1, 'FMT2')))
+            af(cache.has_format(1, 'FMT2'))
+            at(os.path.exists(ap))
+
+        # Test that the old interface agrees
+        db = self.init_old()
+        at(db.format(1, 'FMT1', index_is_id=True) is None)
+
+        db.close()
+        del db
+    # }}}
+