Allow running the yacfg scripts directly; use absolute imports, add s…

…hebang, and fixup `sys.path` if needed

Shebang has been added at the beginning of yacfg_batch_cli.py and yacfg_cli.py to allow script execution. The import statements have been updated to avoid 'ImportError'. Unnecessary sys.path entries are removed to guard against import misdirection. Also, a script entry point check has been added at the end of yacfg_cli.py.

src/yacfg/cli/yacfg_cli.py

@@ -1,19 +1,16 @@
+#! /usr/bin/env -S python3 -sP
+
 import logging
 import os
 import sys
 
-from .. import NAME, __version__, logger_settings
+from yacfg import NAME, __version__, logger_settings
 from yacfg.cli.cli_arguments import boolize, parse_key_value_list, parser
-from ..config_data import RenderOptions
-from ..exceptions import GenerationError, ProfileError, TemplateError
-from ..output import (
-    export_tuning_variables,
-    new_profile,
-    new_profile_rendered,
-    new_template,
-)
-from ..query import list_profiles, list_templates
-from ..yacfg import generate
+from yacfg.config_data import RenderOptions
+from yacfg.exceptions import GenerationError, ProfileError, TemplateError
+from yacfg.output import export_tuning_variables, new_profile, new_profile_rendered, new_template
+from yacfg.query import list_profiles, list_templates
+from yacfg.yacfg import generate
 
 logger_settings.config_console_logger()
 
@@ -107,10 +104,10 @@ def run(self, args=None):
                     self.error(str(exc), 0)
 
         if (
-            options.new_profile
-            or options.new_profile_static
-            or options.export_tuning
-            or options.new_template
+                options.new_profile
+                or options.new_profile_static
+                or options.export_tuning
+                or options.new_template
         ):
             sys.exit(0)
 
@@ -148,3 +145,7 @@ def error(msg: str, ecode: int = 2) -> None:
 def main():
     app = CommandLineApp()
     app.run()
+
+
+if __name__ == '__main__':
+    main()

src/yacfg_batch/yacfg_batch_cli.py

@@ -1,13 +1,24 @@
+#! /usr/bin/env -S python3 -sP
+
 from __future__ import print_function
 
 import logging
+import pathlib
 import sys
 
+# `from yacfg_batch import ...` may target both src/yacfg/yacfg_batch/__init__.py
+# and src/yacfg/yacfg_batch/yacfg_batch.py (which is on sys.path when running
+# this file directly). Remove the undesirable sys.path entry to prevent `ImportError`s.
+try:
+    sys.path.remove(str(pathlib.Path(__file__).resolve().parent))
+except ValueError:
+    pass
+
 from yacfg import NAME, logger_settings
 
-from . import __version__
-from .cli_arguments import parser
-from .yacfg_batch import generate
+from yacfg_batch import __version__
+from yacfg_batch.cli_arguments import parser
+from yacfg_batch.yacfg_batch import generate
 
 logger_settings.config_console_logger()