Throw a more specific excetion on unsupported file format

changelog.md

@@ -1,6 +1,13 @@
 
 # Changelog
 
+## [1.2.8] - 24 August 2020
+
+### Added
+
+- mglib.exceptions module introduced
+
+
 ## [1.2.7] - 17 August 2020
 
 ### Changed

mglib/exceptions.py

@@ -0,0 +1,8 @@
+"""
+Global mglib exception and warning classes.
+"""
+
+
+class FileTypeNotSupported(Exception):
+    """File type not supported"""
+    pass

mglib/pdfinfo.py

@@ -4,6 +4,7 @@ import subprocess
 import logging
 
 from .conf import settings
+from .exceptions import FileTypeNotSupported
 
 """
 Uses command line pdfinfo utility (from poppler pakage) for various
@@ -74,7 +75,7 @@ def get_pagecount(filepath):
         return get_tiff_pagecount(filepath)
 
     if ext and ext.lower() not in ('.pdf', '.tiff'):
-        raise ValueError(
+        raise FileTypeNotSupported(
             "Only jpeg, png, pdf and tiff are handlerd by this"
             " method"
         )

setup.py

@@ -6,7 +6,7 @@ with open("README.md", "r") as fh:
 
 setup(
     name="mglib",
-    version="1.2.7",
+    version="1.2.8",
     author="Eugen Ciur",
     author_email="eugen@papermerge.com",
     url="https://github.com/papermerge/mglib",