Cleanup get_path usage in favor of pkg_resources.

ebook_converter/ebooks/lrf/fonts.py

@@ -5,29 +5,40 @@ __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
 from PIL import ImageFont
 
+from ebook_converter.utils.fonts.scanner import font_scanner
+
 '''
 Default fonts used in the PRS500
 '''
 
 
-LIBERATION_FONT_MAP = {
-            'Swis721 BT Roman'     : 'LiberationSans-Regular',
-            'Dutch801 Rm BT Roman' : 'LiberationSerif-Regular',
-            'Courier10 BT Roman'   : 'LiberationMono-Regular',
-            }
-
+LIBERATION_FONT_MAP = {'Swis721 BT Roman': 'Liberation Sans Regular',
+                       'Dutch801 Rm BT Roman': 'Liberation Serif Regular',
+                       'Courier10 BT Roman': 'Liberation Mono Regular'}
+_LIB_CACHE = {}
 FONT_FILE_MAP = {}
 
 
 def get_font(name, size, encoding='unic'):
-    '''
+    """
     Get an ImageFont object by name.
     @param size: Font height in pixels. To convert from pts:
                  sz in pixels = (dpi/72) * size in pts
-    @param encoding: Font encoding to use. E.g. 'unic', 'symbol', 'ADOB', 'ADBE', 'aprm'
-    @param manager: A dict that will store the PersistentTemporary
-    '''
+    @param encoding: Font encoding to use. E.g. 'unic', 'symbol', 'ADOB',
+                     'ADBE', 'aprm'
+    """
     if name in LIBERATION_FONT_MAP:
-        return ImageFont.truetype(P('fonts/liberation/%s.ttf' % LIBERATION_FONT_MAP[name]), size, encoding=encoding)
+        if not _LIB_CACHE:
+            for key in font_scanner.cache['fonts']:
+                record = font_scanner.cache['fonts'][key]
+                _LIB_CACHE[record['family_name'] + ' ' +
+                           record['subfamily_name']] = record['path']
+
+        fpath = _LIB_CACHE.get(LIBERATION_FONT_MAP[name])
+        if not fpath:
+            raise ValueError('There is no liberation font existing in the '
+                             'system. Please install them before converter '
+                             'use.')
+        return ImageFont.truetype(fpath, size, encoding=encoding)
     elif name in FONT_FILE_MAP:
         return ImageFont.truetype(FONT_FILE_MAP[name], size, encoding=encoding)