Release 1.2.1: auto-select single NIC

- Auto-select the network adapter when only one is found (configurable via auto_select_single; asked on first run)

src/netswitch/app.py

@@ -18,7 +18,7 @@ from .update_check  import check_for_update
 from .network       import list_adapters, set_static_ip, revert_to_dhcp, get_current_ipv4
 
 
-def _pick_adapter(console: Console) -> dict | None:
+def _pick_adapter(console: Console, auto_single: bool = True) -> dict | None:
     adapters = list_adapters()
     if not adapters:
         console.print(f"[red]{t('no_adapters')}[/]")
@@ -29,6 +29,10 @@ def _pick_adapter(console: Console) -> dict | None:
         ip = a.get("IPv4") or "—"
         console.print(f"  {i}) [{a['Status']:<12}] {a['Name']}  ({a['Description']})  {ip}")
 
+    if auto_single and len(adapters) == 1:
+        console.print(f"[green]{t('only_adapter', name=adapters[0]['Name'])}[/]")
+        return adapters[0]
+
     while True:
         s = Prompt.ask(t("select_adapter")).strip()
         if s.isdigit() and 1 <= int(s) <= len(adapters):
@@ -80,7 +84,7 @@ def main() -> None:
         console.print(title)
     console.print()
 
-    nic = _pick_adapter(console)
+    nic = _pick_adapter(console, cfg_data.get("auto_select_single", True))
     if not nic:
         input(t("press_enter")); return
 

src/netswitch/config.py

@@ -19,16 +19,25 @@ CONFIG_HEADER = """\
 # ---------------------------------------------------------------------------
 # netswitch configuration
 #
-# To change the interface language, edit the 'language' value below.
+# language            : interface language. Valid: en, ru
-# Valid values: en, ru
+# auto_select_single  : auto-pick the network adapter when only one is found,
+#                       without asking (yes/no).
 #
-# Чтобы сменить язык интерфейса, измените значение 'language' ниже.
+# language            : язык интерфейса. Допустимо: en, ru
-# Допустимые значения: en, ru
+# auto_select_single  : автоматически выбирать сетевой адаптер, если он
+#                       единственный, не спрашивая (yes/no).
 # ---------------------------------------------------------------------------
 
 """
 
 
+def _to_bool(s: str, default: bool) -> bool:
+    s = (s or "").strip().lower()
+    if s in ("yes", "true", "y", "1", "on"):  return True
+    if s in ("no",  "false", "n", "0", "off"): return False
+    return default
+
+
 def app_dir() -> Path:
     """Directory holding the running executable (or source folder when run via python)."""
     if getattr(sys, "frozen", False):
@@ -57,10 +66,26 @@ def _ask_language() -> str:
         print("Please enter 1 or 2 / Введите 1 или 2")
 
 
-def _write_config(lang: str) -> None:
+def _ask_auto_select() -> bool:
+    """First-run prompt — auto-select a lone adapter? Bilingual stdin."""
+    print()
+    print("Auto-select the network adapter when only one is found? (y/n)")
+    print("Автовыбор сетевого адаптера, если он единственный? (y/n)")
+    while True:
+        try:
+            c = input("> ").strip().lower()
+        except (EOFError, KeyboardInterrupt):
+            return True
+        if c in ("y", "yes", "д", "да", "1"):  return True
+        if c in ("n", "no",  "н", "нет", "0"): return False
+        print("y / n")
+
+
+def _write_config(lang: str, auto_select: bool) -> None:
     path = config_path()
     cp = configparser.ConfigParser()
-    cp["General"] = {"language": lang}
+    cp["General"] = {"language": lang,
+                     "auto_select_single": "yes" if auto_select else "no"}
     with path.open("w", encoding="utf-8") as f:
         f.write(CONFIG_HEADER)
         cp.write(f)
@@ -70,19 +95,21 @@ def load_config() -> dict:
     path = config_path()
     if not path.exists():
         lang = _ask_language()
+        auto = _ask_auto_select()
         try:
-            _write_config(lang)
+            _write_config(lang, auto)
         except OSError:
             pass
-        return {"language": lang}
+        return {"language": lang, "auto_select_single": auto}
 
     cp = configparser.ConfigParser()
     try:
         cp.read(path, encoding="utf-8")
     except (configparser.Error, OSError):
-        return {"language": DEFAULT_LANG}
+        return {"language": DEFAULT_LANG, "auto_select_single": True}
 
     lang = (cp.get("General", "language", fallback=DEFAULT_LANG) or DEFAULT_LANG).strip().lower()
     if lang not in SUPPORTED_LANGS:
         lang = DEFAULT_LANG
-    return {"language": lang}
+    auto = _to_bool(cp.get("General", "auto_select_single", fallback="yes"), True)
+    return {"language": lang, "auto_select_single": auto}

src/netswitch/i18n.py

@@ -14,6 +14,7 @@ STRINGS: dict[str, dict[str, str]] = {
         "no_adapters":        "No physical wired adapters found.",
         "press_enter":        "Press Enter to exit",
         "available_adapters": "Available adapters:",
+        "only_adapter":       "Only one adapter, auto-selected: {name}",
         "select_adapter":     "Select adapter number",
         "invalid_selection":  "Invalid selection.",
         "selected":           "Selected: {name}",
@@ -40,6 +41,7 @@ STRINGS: dict[str, dict[str, str]] = {
         "no_adapters":        "Подходящие проводные адаптеры не найдены.",
         "press_enter":        "Нажмите Enter для выхода",
         "available_adapters": "Доступные адаптеры:",
+        "only_adapter":       "Адаптер один, выбран автоматически: {name}",
         "select_adapter":     "Введите номер адаптера",
         "invalid_selection":  "Неверный выбор.",
         "selected":           "Выбрано: {name}",