From d96c632028a180c729a2cb3fbb232446b0f042c2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 26 Feb 2015 12:18:32 +0530
Subject: [PATCH] Add API to get absolute path to cover

---
 src/calibre/db/backend.py |  6 ++++++
 src/calibre/db/cache.py   | 19 +++++++++++++------
 2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/src/calibre/db/backend.py b/src/calibre/db/backend.py
index 0df7e939c8..1f25eae6b1 100644
--- a/src/calibre/db/backend.py
+++ b/src/calibre/db/backend.py
@@ -1230,6 +1230,12 @@ class DB(object):
             shutil.copyfile(candidates[0], fmt_path)
             return fmt_path
 
+    def cover_abspath(self, book_id, path):
+        path = os.path.join(self.library_path, path)
+        fmt_path = os.path.join(path, 'cover.jpg')
+        if os.path.exists(fmt_path):
+            return fmt_path
+
     def apply_to_format(self, book_id, path, fname, fmt, func, missing_value=None):
         path = self.format_abspath(book_id, fmt, fname, path)
         if path is None:
diff --git a/src/calibre/db/cache.py b/src/calibre/db/cache.py
index bffb792bfe..d665534715 100644
--- a/src/calibre/db/cache.py
+++ b/src/calibre/db/cache.py
@@ -708,20 +708,27 @@ class Cache(object):
         Instead use, :meth:`copy_format_to`.
 
         Currently used only in calibredb list, the viewer, edit book,
-        compare_format to original format and the catalogs (via
+        compare_format to original format, open with and the catalogs (via
         get_data_as_dict()).
 
-        Apart from the viewer and edit book, I don't believe any of the others
-        do any file write I/O with the results of this call.
+        Apart from the viewer, open with and edit book, I don't believe any of
+        the others do any file write I/O with the results of this call.
         '''
         fmt = (fmt or '').upper()
         try:
-            name = self.fields['formats'].format_fname(book_id, fmt)
             path = self._field_for('path', book_id).replace('/', os.sep)
         except:
             return None
-        if name and path:
-            return self.backend.format_abspath(book_id, fmt, name, path)
+        if path:
+            if fmt == '__COVER_INTERNAL__':
+                return self.backend.cover_abspath(book_id, path)
+            else:
+                try:
+                    name = self.fields['formats'].format_fname(book_id, fmt)
+                except:
+                    return None
+                if name:
+                    return self.backend.format_abspath(book_id, fmt, name, path)
 
     @read_api
     def has_format(self, book_id, fmt):