Improve parsing inputs for download command

* Fix overzealous regex which caused video patterns to be identified as
  clips by testing for videos before clips.
* Allow URLs with or without `www.`.
* Add tests which verify this actually works.

fixes #28

Makefile

@@ -19,3 +19,6 @@ deb:
 
 man:
 	scdoc < twitch-dl.1.scd > twitch-dl.1.man
+
+test:
+	pytest

requirements-dev.txt

@@ -1,5 +1,3 @@
-pytest-cov~=2.4.0
-pytest~=3.0.0
-stdeb~=0.8.5
-twine~=1.8.1
-wheel~=0.29.0
+pytest
+twine
+wheel

tests/test_download.py

@@ -0,0 +1,45 @@
+import pytest
+
+from unittest.mock import patch
+from twitchdl.commands import download
+from collections import namedtuple
+
+Args = namedtuple("args", ["video"])
+
+
+TEST_VIDEO_PATTERNS = [
+    ("702689313", "702689313"),
+    ("702689313", "https://twitch.tv/videos/702689313"),
+    ("702689313", "https://www.twitch.tv/videos/702689313"),
+]
+
+TEST_CLIP_PATTERNS = {
+    ("AbrasivePlayfulMangoMau5", "AbrasivePlayfulMangoMau5"),
+    ("AbrasivePlayfulMangoMau5", "https://clips.twitch.tv/AbrasivePlayfulMangoMau5"),
+    ("AbrasivePlayfulMangoMau5", "https://www.twitch.tv/dracul1nx/clip/AbrasivePlayfulMangoMau5"),
+    ("AbrasivePlayfulMangoMau5", "https://twitch.tv/dracul1nx/clip/AbrasivePlayfulMangoMau5"),
+    ("HungryProudRadicchioDoggo", "HungryProudRadicchioDoggo"),
+    ("HungryProudRadicchioDoggo", "https://clips.twitch.tv/HungryProudRadicchioDoggo"),
+    ("HungryProudRadicchioDoggo", "https://www.twitch.tv/bananasaurus_rex/clip/HungryProudRadicchioDoggo?filter=clips&range=7d&sort=time"),
+    ("HungryProudRadicchioDoggo", "https://twitch.tv/bananasaurus_rex/clip/HungryProudRadicchioDoggo?filter=clips&range=7d&sort=time"),
+}
+
+
+@patch("twitchdl.commands._download_clip")
+@patch("twitchdl.commands._download_video")
+@pytest.mark.parametrize("expected,input", TEST_VIDEO_PATTERNS)
+def test_video_patterns(video_dl, clip_dl, expected, input):
+    args = Args(video=input)
+    download(args)
+    video_dl.assert_called_once_with(expected, args)
+    clip_dl.assert_not_called()
+
+
+@patch("twitchdl.commands._download_clip")
+@patch("twitchdl.commands._download_video")
+@pytest.mark.parametrize("expected,input", TEST_CLIP_PATTERNS)
+def test_clip_patterns(video_dl, clip_dl, expected, input):
+    args = Args(video=input)
+    download(args)
+    clip_dl.assert_called_once_with(expected, args)
+    video_dl.assert_not_called()

twitchdl/commands.py

@@ -164,29 +164,29 @@ def _crete_temp_dir(base_uri):
 
 VIDEO_PATTERNS = [
     r"^(?P<id>\d+)?$",
-    r"^https://www.twitch.tv/videos/(?P<id>\d+)(\?.+)?$",
+    r"^https://(www.)?twitch.tv/videos/(?P<id>\d+)(\?.+)?$",
 ]
 
 CLIP_PATTERNS = [
     r"^(?P<slug>[A-Za-z0-9]+)$",
-    r"^https://www.twitch.tv/\w+/clip/(?P<slug>[A-Za-z0-9]+)(\?.+)?$",
+    r"^https://(www.)?twitch.tv/\w+/clip/(?P<slug>[A-Za-z0-9]+)(\?.+)?$",
     r"^https://clips.twitch.tv/(?P<slug>[A-Za-z0-9]+)(\?.+)?$",
 ]
 
 
 def download(args):
-    for pattern in CLIP_PATTERNS:
-        match = re.match(pattern, args.video)
-        if match:
-            clip_slug = match.group('slug')
-            return _download_clip(clip_slug, args)
-
     for pattern in VIDEO_PATTERNS:
         match = re.match(pattern, args.video)
         if match:
             video_id = match.group('id')
             return _download_video(video_id, args)
 
+    for pattern in CLIP_PATTERNS:
+        match = re.match(pattern, args.video)
+        if match:
+            clip_slug = match.group('slug')
+            return _download_clip(clip_slug, args)
+
     raise ConsoleError("Invalid video: {}".format(args.video))