add test_sort_by.py (and theme_compare.py and add function to

database.py)

test/theme_compare.py

@@ -0,0 +1,43 @@
+import re
+MATCH = re.compile(r'\d+')
+
+
+def compare_jk(j, k):
+    if j == k: return 0
+    else: return 1 if j < k else -1
+
+
+def semver_split(item):
+    split_list = [MATCH.search(i).group() if
+                  len(item) > 0 else '0' for i in item.split('.')]
+    if len(split_list) == 1: split_list.append('0')
+    if len(split_list) == 2: split_list.append('0')
+    return [int(x) for x in split_list]
+
+
+def compare_theme(x, y, sort_key):
+    if sort_key == 'sortByName':
+        return compare_jk(y['name'].lower(), x['name'].lower())
+
+    elif sort_key == 'sortByStars':
+        return compare_jk(int(x['stars']), int(y['stars']))
+
+    elif sort_key == 'sortByMinVer':
+        x_list = semver_split(x['min_ver'])
+        y_list = semver_split(y['min_ver'])
+        return compare_jk(x_list, y_list)
+
+    elif sort_key == 'sortByDate':
+        return compare_jk(x['date'], y['date'])
+
+    elif sort_key == 'sortByLicense':
+        return compare_jk(y['license'].lower(), x['license'].lower())
+
+    else:
+        return 0
+
+
+def theme_compare(a, b, y):
+    if len(y) == 0: return -1
+    rslt = compare_theme(a, b, y[0])
+    return theme_compare(a, b, y[1:]) if rslt == 0 else rslt