fix: pwsh autocompletion not returning command hints

.gitignore

@@ -12,3 +12,4 @@ htmlcov
 coverage.xml
 .coverage*
 .cache
+venv/

typer/_completion_classes.py

@@ -182,7 +182,13 @@ 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_split_arg_string(completion_args)
-        args = cwords[1:-1] if incomplete else cwords[1:]
+        # cwords[0] is the interpreter (e.g. "python"), cwords[1] is the
+        # prog name (e.g. "main.py") — skip both, same as bash/zsh do with
+        # their respective word splitting. Without this, the prog name leaks
+        # into args and Click can't resolve the command context, causing
+        # completions to silently return nothing (issue #266).
+
+        args = cwords[2:-1] if incomplete else cwords[2:]
         return args, incomplete
 
     def format_completion(self, item: click.shell_completion.CompletionItem) -> str:

typer/_completion_shared.py

@@ -55,9 +55,9 @@ class Shells(str, Enum):
         [System.Management.Automation.CompletionResult]::new(
             $command, $command, 'ParameterValue', $helpString)
     }
-    $Env:%(autocomplete_var)s = ""
-    $Env:_TYPER_COMPLETE_ARGS = ""
-    $Env:_TYPER_COMPLETE_WORD_TO_COMPLETE = ""
+    Remove-Item Env:%(autocomplete_var)s -ErrorAction SilentlyContinue
+    Remove-Item Env:_TYPER_COMPLETE_ARGS -ErrorAction SilentlyContinue
+    Remove-Item Env:_TYPER_COMPLETE_WORD_TO_COMPLETE -ErrorAction SilentlyContinue
 }
 Register-ArgumentCompleter -Native -CommandName %(prog_name)s -ScriptBlock $scriptblock
 """