Replace normalize_name with canonicalize_name

Per @dims:
    pip removed some of the code find_missing_reqs.pya needed
    pypa/pip@8c67bcc#diff-ab583908279e865537dec218246edcfc

    So pip_check_reqs fails with latest pip versions

This commit replaces it with `canonicalize_name` from the _packaging_
distribution.

Author: wcooley

pip_check_reqs/common.py

@@ -5,9 +5,9 @@
 import os
 import re
 
+from packaging.utils import canonicalize_name
 from pip.download import PipSession
 from pip.req import parse_requirements
-from pip.utils import normalize_name
 
 log = logging.getLogger(__name__)
 
@@ -129,7 +129,7 @@ def find_required_modules(options):
             log.debug('ignoring requirement: %s', requirement.name)
         else:
             log.debug('found requirement: %s', requirement.name)
-            explicit.add(normalize_name(requirement.name))
+            explicit.add(canonicalize_name(requirement.name))
     return explicit
 
 

pip_check_reqs/find_extra_reqs.py

@@ -4,8 +4,9 @@
 import os
 import sys
 
+from packaging.utils import canonicalize_name
 from pip.commands.show import search_packages_info
-from pip.utils import get_installed_distributions, normalize_name
+from pip.utils import get_installed_distributions
 
 from pip_check_reqs import common
 
@@ -38,7 +39,7 @@ def find_extra_reqs(options):
     for modname, info in used_modules.items():
         # probably standard library if it's not in the files list
         if info.filename in installed_files:
-            used_name = normalize_name(installed_files[info.filename])
+            used_name = canonicalize_name(installed_files[info.filename])
             log.debug('used module: %s (from package %s)', modname,
                 installed_files[info.filename])
             used[used_name].append(info)

pip_check_reqs/find_missing_reqs.py

@@ -4,10 +4,11 @@
 import os
 import sys
 
+from packaging.utils import canonicalize_name
 from pip.commands.show import search_packages_info
 from pip.download import PipSession
 from pip.req import parse_requirements
-from pip.utils import get_installed_distributions, normalize_name
+from pip.utils import get_installed_distributions
 
 from pip_check_reqs import common
 
@@ -40,7 +41,7 @@ def find_missing_reqs(options):
     for modname, info in used_modules.items():
         # probably standard library if it's not in the files list
         if info.filename in installed_files:
-            used_name = normalize_name(installed_files[info.filename])
+            used_name = canonicalize_name(installed_files[info.filename])
             log.debug('used module: %s (from package %s)', modname,
                 installed_files[info.filename])
             used[used_name].append(info)
@@ -54,7 +55,7 @@ def find_missing_reqs(options):
     for requirement in parse_requirements('requirements.txt',
             session=PipSession()):
         log.debug('found requirement: %s', requirement.name)
-        explicit.add(normalize_name(requirement.name))
+        explicit.add(canonicalize_name(requirement.name))
 
     return [(name, used[name]) for name in used
         if name not in explicit]

setup.py

@@ -38,4 +38,8 @@
             'pip-extra-reqs=pip_check_reqs.find_extra_reqs:main',
         ],
     },
+    install_requires=[
+        'packaging',
+        'pip',
+    ],
 )