rationalize exceptions

pipeline/compilers/__init__.py

@@ -4,11 +4,11 @@ import os
 import subprocess
 
 from django.contrib.staticfiles import finders
-
 from django.core.files.base import ContentFile
 from django.utils.encoding import smart_str
 
 from pipeline.conf import settings
+from pipeline.exceptions import CompilerError
 from pipeline.storage import default_storage
 from pipeline.utils import to_class
 
@@ -75,10 +75,6 @@ class CompilerBase(object):
         return content
 
 
-class CompilerError(Exception):
-    pass
-
-
 class SubProcessCompiler(CompilerBase):
     def execute_command(self, command, content=None, cwd=None):
         pipe = subprocess.Popen(command, shell=True, cwd=cwd,

pipeline/compressors/__init__.py

@@ -13,6 +13,7 @@ from django.utils.encoding import smart_bytes, force_text
 from pipeline.conf import settings
 from pipeline.storage import default_storage
 from pipeline.utils import to_class, relpath
+from pipeline.exceptions import CompressorError
 
 URL_DETECTOR = r'url\([\'"]?([^\s)]+\.[a-z]+[\?\#\d\w]*)[\'"]?\)'
 URL_REPLACER = r'url\(__EMBED__(.+?)(\?\d+)?\)'
@@ -224,11 +225,6 @@ class CompressorBase(object):
         raise NotImplementedError
 
 
-class CompressorError(Exception):
-    """This exception is raised when a filter fails"""
-    pass
-
-
 class SubProcessCompressor(CompressorBase):
     def execute_command(self, command, content):
         pipe = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE,

pipeline/exceptions.py

+from __future__ import unicode_literals
+
+
+class PipelineException(Exception):
+    pass
+
+
+class PackageNotFound(PipelineException):
+    pass
+
+
+class CompilerError(PipelineException):
+    pass
+
+
+class CompressorError(PipelineException):
+    pass

pipeline/packager.py

@@ -4,9 +4,10 @@ from django.contrib.staticfiles.finders import find
 from django.core.files.base import ContentFile
 from django.utils.encoding import smart_str
 
-from pipeline.conf import settings
 from pipeline.compilers import Compiler
 from pipeline.compressors import Compressor
+from pipeline.conf import settings
+from pipeline.exceptions import PackageNotFound
 from pipeline.glob import glob
 from pipeline.signals import css_compressed, js_compressed
 from pipeline.storage import default_storage
@@ -121,7 +122,3 @@ class Packager(object):
         for name in config:
             packages[name] = Package(config[name])
         return packages
-
-
-class PackageNotFound(Exception):
-    pass