refactor: added utility to convert title into slug

community/lms/test_utils.py

@@ -0,0 +1,17 @@
+import unittest
+from .utils import slugify
+
+class TestSlugify(unittest.TestCase):
+    def test_simple(self):
+        self.assertEquals(slugify("hello-world"), "hello-world")
+        self.assertEquals(slugify("Hello World"), "hello-world")
+        self.assertEquals(slugify("Hello, World!"), "hello-world")
+
+    def test_duplicates(self):
+        self.assertEquals(
+            slugify("Hello World", ['hello-world']),
+            "hello-world-2")
+
+        self.assertEquals(
+            slugify("Hello World", ['hello-world', 'hello-world-2']),
+            "hello-world-3")

community/lms/utils.py

@@ -0,0 +1,30 @@
+import re
+
+RE_SLUG_NOTALLOWED = re.compile("[^a-z0-9]+")
+
+def slugify(title, used_slugs=[]):
+    """Converts title to a slug.
+
+    If a list of used slugs is specified, it will make sure the generated slug
+    is not one of them.
+
+        >>> slugify("Hello World!")
+        'hello-world'
+        >>> slugify("Hello World!", ['hello-world'])
+        'hello-world-2'
+        >>> slugify("Hello World!", ['hello-world', 'hello-world-2'])
+        'hello-world-3'
+    """
+    slug = RE_SLUG_NOTALLOWED.sub('-', title.lower()).strip('-')
+    used_slugs = set(used_slugs)
+
+    if slug not in used_slugs:
+        return slug
+
+    count = 2
+    while True:
+        new_slug = f"{slug}-{count}"
+        if new_slug not in used_slugs:
+            return new_slug
+        count = count+1
+