A spot of refactoring

src/calibre/db/cli/cmd_list.py

@@ -7,10 +7,10 @@ from __future__ import absolute_import, division, print_function, unicode_litera
 import json
 import os
 import sys
-import unicodedata
 from textwrap import TextWrapper
 
 from calibre import prints
+from calibre.db.utils import str_width
 from calibre.ebooks.metadata import authors_to_string
 from calibre.utils.date import isoformat
 
@@ -172,12 +172,6 @@ def do_list(
     output_table = prepare_output_table(fields, book_ids, data, metadata)
     widths = list(map(lambda x: 0, fields))
 
-    def chr_width(x):
-        return 1 + unicodedata.east_asian_width(x).startswith('W')
-
-    def str_width(x):
-        return sum(map(chr_width, x))
-
     for record in output_table:
         for j in range(len(fields)):
             widths[j] = max(widths[j], str_width(record[j]))

src/calibre/db/cli/utils.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python2
+# vim:fileencoding=utf-8
+# License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
+
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import unicodedata
+
+eaw = unicodedata.east_asian_width
+
+
+def chr_width(x):
+    return 1 + eaw(x).startswith('W')
+
+
+def str_width(x):
+    return sum(map(chr_width, x))