sagemathgh-40912: cli: Allow importing modules from the current directory when running a command or a file.
    
Matches python behavior, and fixes another regression with respect to
the bash script

Fixes sagemath#40908

### ⌛ Dependencies

sagemath#40872
    
URL: sagemath#40912
Reported by: Antonio Rojas
Reviewer(s): Tobias Diez

Author: Release Manager

pyproject.toml

@@ -103,7 +103,7 @@ content-type = "text/markdown"
 file = "README.md"
 
 [project.scripts]
-sage = "sage.cli:main"
+sage = "sage.cli.__main__:main"
 
 [tool.conda-lock]
 platforms = ['linux-64', 'linux-aarch64', 'osx-64', 'osx-arm64']

src/sage/cli/__main__.py

@@ -1,5 +1,9 @@
+import os
 import sys
 
+# Allow importing modules from the current directory, matching python behavior
+sys.path.append(os.getcwd())
+
 from sage.cli import main
 
 sys.exit(main())

src/sage/cli/run_file_cmd.py

@@ -1,4 +1,5 @@
 import argparse
+import sys
 
 from sage.cli.options import CliOptions
 from sage.repl.preparse import preparse_file_named
@@ -33,7 +34,6 @@ def __init__(self, options: CliOptions):
         """
         self.options = options
         # shift sys.argv for compatibility with the old sage bash script and python command when consuming arguments from the command line
-        import sys
         del sys.argv[0]
 
     def run(self) -> int: