Store: better comparable price function from Roman Mukhin.

src/calibre/gui2/store/search/models.py

@@ -22,13 +22,16 @@ from calibre.utils.icu import sort_key
 from calibre.utils.search_query_parser import SearchQueryParser
 
 def comparable_price(text):
-    text = re.sub(r'[^0-9.,]', '', text)
-    delimeter = (',', '.')
-    if len(text) < 3 or text[-3] not in delimeter:
-        text += '00'
-    text = re.sub(r'\D', '', text)
-    text = text.rjust(6, '0')
-    return text
+    # this keep thousand and fraction separators
+    match = re.search(r'(?:\d|[,.](?=\d))(?:\d*(?:[,.\' ](?=\d))?)+', text)
+    if match:
+        # replace all separators with '.'
+        m = re.sub(r'[.,\' ]', '.', match.group())
+        # remove all separators accept fraction, 
+        # leave only 2 digits in fraction
+        m = re.sub(r'\.(?!\d*$)', r'', m)
+        text = '{0:0>8.0f}'.format(float(m) * 100.)
+    return text  
 
 
 class Matches(QAbstractItemModel):