pyright/ruff error fixes. Autoinstall check of autocomplete

cli/src/zshell/__init__.py

@@ -1,5 +1,10 @@
 from __future__ import annotations
+import sys
+from pathlib import Path
+
+import click
 import typer
+from typer._completion_shared import install, _get_shell_name
 from zshell.subcommands import shell, scheme, screenshot, wallpaper, record
 
 app = typer.Typer(name="zshell-cli")
@@ -11,5 +16,34 @@ app.add_typer(wallpaper.app, name="wallpaper")
 app.add_typer(record.app, name="record")
 
 
+def _completion_installed() -> bool:
+    shell = _get_shell_name()
+    match shell:
+        case "zsh":
+            return (Path.home() / ".zfunc" / "_zshell-cli").exists()
+        case "bash":
+            return (Path.home() / ".bash_completions" / "zshell-cli.sh").exists()
+        case "fish":
+            return (Path.home() / ".config" / "fish" / "completions" / "zshell-cli.fish").exists()
+    return False
+
+
+def _auto_install_completion() -> None:
+    if not sys.stdout.isatty():
+        return
+    if _completion_installed():
+        return
+    shell = _get_shell_name()
+    if shell is None:
+        return
+    try:
+        _, path = install(prog_name="zshell-cli")
+        click.secho(f"zshell-cli: Shell completion installed ({shell}: {path})", fg="green")
+        click.echo("zshell-cli: Restart your shell or source the file to enable tab-completion.")
+    except Exception:
+        pass
+
+
 def main() -> None:
+    _auto_install_completion()
     app()