fix: allow for caps in file name suffixes #206

@schinkelg ran aground of this one and I took the opportunity to add a
test to catch this sort of thing for next time.

src/paperless_tesseract/signals.py

@@ -5,7 +5,7 @@ from .parsers import RasterisedDocumentParser
 
 class ConsumerDeclaration(object):
 
-    MATCHING_FILES = re.compile("^.*\.(pdf|jpg|gif|png|tiff|pnm|bmp)$")
+    MATCHING_FILES = re.compile("^.*\.(pdf|jpg|gif|png|tiff?|pnm|bmp)$")
 
     @classmethod
     def handle(cls, sender, **kwargs):
@@ -14,7 +14,7 @@ class ConsumerDeclaration(object):
     @classmethod
     def test(cls, doc):
 
-        if cls.MATCHING_FILES.match(doc):
+        if cls.MATCHING_FILES.match(doc.lower()):
             return {
                 "parser": RasterisedDocumentParser,
                 "weight": 0

src/paperless_tesseract/tests/test_signals.py

@@ -0,0 +1,36 @@
+from django.test import TestCase
+
+from ..signals import ConsumerDeclaration
+
+
+class SignalsTestCase(TestCase):
+
+    def test_test_handles_various_file_names_true(self):
+
+        prefixes = (
+            "doc", "My Document", "Μυ Γρεεκ Δοψθμεντ", "Doc -with - tags",
+            "A document with a . in it", "Doc with -- in it"
+        )
+        suffixes = (
+            "pdf", "jpg", "gif", "png", "tiff", "tif", "pnm", "bmp",
+            "PDF", "JPG", "GIF", "PNG", "TIFF", "TIF", "PNM", "BMP",
+            "pDf", "jPg", "gIf", "pNg", "tIff", "tIf", "pNm", "bMp",
+        )
+
+        for prefix in prefixes:
+            for suffix in suffixes:
+                name = "{}.{}".format(prefix, suffix)
+                self.assertTrue(ConsumerDeclaration.test(name))
+
+    def test_test_handles_various_file_names_false(self):
+
+        prefixes = ("doc",)
+        suffixes = ("txt", "markdown", "",)
+
+        for prefix in prefixes:
+            for suffix in suffixes:
+                name = "{}.{}".format(prefix, suffix)
+                self.assertFalse(ConsumerDeclaration.test(name))
+
+        self.assertFalse(ConsumerDeclaration.test(""))
+        self.assertFalse(ConsumerDeclaration.test("doc"))