Fix typer command cannot run scripts that imports other scripts

tests/assets/cli/import_other.py

@@ -0,0 +1,7 @@
+from imported_by_other import hello
+from subdir.imported_nested import echo
+
+
+def main(name: str):
+    hello(name)
+    echo(name)

tests/assets/cli/imported_by_other.py

@@ -0,0 +1,2 @@
+def hello(name):
+    print(f"Hello {name}")

tests/assets/cli/subdir/imported_nested.py

@@ -0,0 +1,2 @@
+def echo(arg):
+    print(f"echo: {arg}")

tests/test_cli/test_import_other.py

@@ -0,0 +1,22 @@
+import subprocess
+import sys
+
+
+def test_script():
+    result = subprocess.run(
+        [
+            sys.executable,
+            "-m",
+            "coverage",
+            "run",
+            "-m",
+            "typer",
+            "tests/assets/cli/import_other.py",
+            "run",
+            "Dr. Magic",
+        ],
+        capture_output=True,
+        encoding="utf-8",
+    )
+    assert "Hello Dr. Magic" in result.stdout
+    assert "echo: Dr. Magic" in result.stdout

typer/cli.py

@@ -122,6 +122,8 @@ def get_typer_from_state() -> Optional[typer.Typer]:
     if state.file:
         module_name = state.file.name
         spec = importlib.util.spec_from_file_location(module_name, str(state.file))
+        # the module may import other modules in the same directory
+        sys.path.append(str(state.file.parent))
     elif state.module:
         spec = importlib.util.find_spec(state.module)
     if spec is None: