🐛 Fix PowerShell completion with incomplete word (#360)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: svlandeg <svlandeg@github.com>

tests/test_tutorial/test_options_autocompletion/test_tutorial003.py

@@ -9,7 +9,7 @@
 runner = CliRunner()
 
 
-def test_completion():
+def test_completion_zsh():
     result = subprocess.run(
         [sys.executable, "-m", "coverage", "run", mod.__file__, " "],
         capture_output=True,
@@ -25,6 +25,23 @@ def test_completion():
     assert "Sebastian" in result.stdout
 
 
+def test_completion_powershell():
+    result = subprocess.run(
+        [sys.executable, "-m", "coverage", "run", mod.__file__, " "],
+        capture_output=True,
+        encoding="utf-8",
+        env={
+            **os.environ,
+            "_TUTORIAL003.PY_COMPLETE": "complete_powershell",
+            "_TYPER_COMPLETE_ARGS": "tutorial003.py --name Seb",
+            "_TYPER_COMPLETE_WORD_TO_COMPLETE": "Seb",
+        },
+    )
+    assert "Camila" not in result.stdout
+    assert "Carlos" not in result.stdout
+    assert "Sebastian" in result.stdout
+
+
 def test_1():
     result = runner.invoke(mod.app, ["--name", "Camila"])
     assert result.exit_code == 0

tests/test_tutorial/test_options_autocompletion/test_tutorial003_an.py

@@ -9,7 +9,7 @@
 runner = CliRunner()
 
 
-def test_completion():
+def test_completion_zsh():
     result = subprocess.run(
         [sys.executable, "-m", "coverage", "run", mod.__file__, " "],
         capture_output=True,
@@ -25,6 +25,23 @@ def test_completion():
     assert "Sebastian" in result.stdout
 
 
+def test_completion_powershell():
+    result = subprocess.run(
+        [sys.executable, "-m", "coverage", "run", mod.__file__, " "],
+        capture_output=True,
+        encoding="utf-8",
+        env={
+            **os.environ,
+            "_TUTORIAL003_AN.PY_COMPLETE": "complete_powershell",
+            "_TYPER_COMPLETE_ARGS": "tutorial003.py --name Seb",
+            "_TYPER_COMPLETE_WORD_TO_COMPLETE": "Seb",
+        },
+    )
+    assert "Camila" not in result.stdout
+    assert "Carlos" not in result.stdout
+    assert "Sebastian" in result.stdout
+
+
 def test_1():
     result = runner.invoke(mod.app, ["--name", "Camila"])
     assert result.exit_code == 0

typer/_completion_classes.py

@@ -175,7 +175,7 @@ def get_completion_args(self) -> Tuple[List[str], str]:
         completion_args = os.getenv("_TYPER_COMPLETE_ARGS", "")
         incomplete = os.getenv("_TYPER_COMPLETE_WORD_TO_COMPLETE", "")
         cwords = click.parser.split_arg_string(completion_args)
-        args = cwords[1:]
+        args = cwords[1:-1] if incomplete else cwords[1:]
         return args, incomplete
 
     def format_completion(self, item: click.shell_completion.CompletionItem) -> str: