Enable flake8-bugbear linting and fix raised issues

Signed-off-by: Alfred Wingate <parona@protonmail.com>

bin/euscan

@@ -283,8 +283,8 @@ def parse_args():
     # apply getopts to command line, show partial help on failure
     try:
         opts, args = getopt.getopt(sys.argv[1:], short_opts, long_opts)
-    except getopt.GetoptError:
-        raise ParseArgsError(opts_mode + "-options")
+    except getopt.GetoptError as exc:
+        raise ParseArgsError(opts_mode + "-options") from exc
 
     # set options accordingly
     option_switch(opts)

pyproject.toml

@@ -42,4 +42,4 @@ src_paths = ["bin/euscan", "src/euscan/"]
 extend-include = ["bin/euscan", "bin/euscan_patch_metadata"]
 
 [tool.ruff.lint]
-extend-select = ["E", "N", "UP", "W"]
+extend-select = ["B", "E", "N", "UP", "W"]

src/euscan/handlers/__init__.py

@@ -13,7 +13,7 @@ from euscan import CONFIG, output
 handlers = {"package": [], "url": [], "all": {}}
 
 # autoimport all modules in this directory and append them to handlers list
-for loader, module_name, is_pkg in pkgutil.walk_packages(__path__):
+for loader, module_name, _is_pkg in pkgutil.walk_packages(__path__):
     module = loader.find_spec(module_name).loader.load_module(module_name)
     if not hasattr(module, "HANDLER_NAME"):
         continue

src/euscan/helpers.py

@@ -92,7 +92,6 @@ def version_blacklisted(cp, version):
     for bv in BLACKLIST_VERSIONS:
         if dep.match_from_list(bv, [cpv]):
             rule = bv
-            None
 
     if rule:
         euscan.output.einfo(f"{cpv} is blacklisted by rule {rule}")
@@ -223,7 +222,7 @@ def gen_versions(components, level):
 
     for i in range(n, n - level, -1):
         increment_version(components, i - 1)
-        for j in range(depth):
+        for _j in range(depth):
             versions.append(list(components))
             increment_version(components, i - 1)