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

Author: antonio-rojas

src/sage/cli/eval_cmd.py

@@ -3,6 +3,7 @@
 from sage.cli.options import CliOptions
 from sage.repl.preparse import preparse
 from sage.all import sage_globals
+import os, sys
 
 
 class EvalCmd:
@@ -36,6 +37,9 @@ def run(self) -> int:
         r"""
         Execute the given command.
         """
+        # Allow importing modules from the current directory, matching python behavior
+        sys.path.append(os.getcwd())
+
         code = preparse(self.options.command)
         eval(compile(code, "<cmdline>", "exec"), sage_globals())
         return 0

src/sage/cli/run_file_cmd.py

@@ -5,6 +5,7 @@
 from sage.repl.load import load_cython
 from sage.misc.temporary_file import tmp_filename
 from sage.all import sage_globals
+import os, sys
 
 
 class RunFileCmd:
@@ -40,6 +41,9 @@ def run(self) -> int:
         r"""
         Execute the given command.
         """
+        # Allow importing modules from the current directory, matching python behavior
+        sys.path.append(os.getcwd())
+
         input_file = self.options.file[0]
         if input_file.endswith('.sage'):
             input_file = str(preparse_file_named(input_file))