Toggle SSH key/password fields by auth method and add key file browser

Show only the SSH key path input (with Browse button) when auth method
is "key", and only the password input when auth method is "password".
Adds a FilePicker widget for browsing SSH key files, defaulting to
~/.ssh directory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tui/gniza.tcss

@@ -241,3 +241,47 @@ Switch {
     color: #00cc00;
     margin: 1 0 0 0;
 }
+
+/* SSH key browse row */
+#re-key-row {
+    height: auto;
+    margin: 0 0 1 0;
+}
+
+#re-key-row Input {
+    width: 1fr;
+}
+
+#re-key-row Button {
+    width: auto;
+    min-width: 12;
+    margin: 0 0 0 1;
+}
+
+/* File picker */
+#file-picker {
+    width: 70;
+    height: 30;
+    padding: 1;
+    background: $panel;
+    border: thick $accent;
+}
+
+#fip-title {
+    text-style: bold;
+    color: #00cc00;
+    margin: 0 0 1 0;
+}
+
+#fip-tree {
+    height: 1fr;
+}
+
+#fip-buttons {
+    height: auto;
+    margin: 1 0 0 0;
+}
+
+#fip-buttons Button {
+    margin: 0 1 0 0;
+}

tui/screens/remote_edit.py

@@ -1,4 +1,5 @@
 import re
+from pathlib import Path
 from textual.app import ComposeResult
 from textual.screen import Screen
 from textual.widgets import Header, Footer, Static, Button, Input, Select, RadioSet, RadioButton
@@ -6,6 +7,7 @@ from textual.containers import Vertical, Horizontal
 
 from tui.config import parse_conf, write_conf, CONFIG_DIR
 from tui.models import Remote
+from tui.widgets import FilePicker
 
 _NAME_RE = re.compile(r'^[a-zA-Z][a-zA-Z0-9_-]{0,31}$')
 
@@ -54,10 +56,12 @@ class RemoteEditScreen(Screen):
                 value=remote.auth_method,
                 classes="ssh-field",
             )
-            yield Static("SSH Key path:", id="lbl-key", classes="ssh-field")
-            yield Input(value=remote.key, placeholder="~/.ssh/id_rsa", id="re-key", classes="ssh-field")
-            yield Static("Password:", id="lbl-password", classes="ssh-field")
-            yield Input(value=remote.password, placeholder="SSH password", password=True, id="re-password", classes="ssh-field")
+            yield Static("SSH Key path:", id="lbl-key", classes="ssh-field ssh-key-field")
+            with Horizontal(id="re-key-row", classes="ssh-field ssh-key-field"):
+                yield Input(value=remote.key, placeholder="~/.ssh/id_rsa", id="re-key")
+                yield Button("Browse...", id="btn-browse-key")
+            yield Static("Password:", id="lbl-password", classes="ssh-field ssh-password-field")
+            yield Input(value=remote.password, placeholder="SSH password", password=True, id="re-password", classes="ssh-field ssh-password-field")
             # Common fields
             yield Static("Base path:")
             yield Input(value=remote.base, placeholder="/backups", id="re-base")
@@ -90,25 +94,43 @@ class RemoteEditScreen(Screen):
         self._update_field_visibility()
 
     def on_select_changed(self, event: Select.Changed) -> None:
-        if event.select.id == "re-type":
+        if event.select.id in ("re-type", "re-auth"):
             self._update_field_visibility()
 
     def _update_field_visibility(self) -> None:
         type_sel = self.query_one("#re-type", Select)
         rtype = str(type_sel.value) if isinstance(type_sel.value, str) else "ssh"
+        is_ssh = rtype == "ssh"
         for w in self.query(".ssh-field"):
-            w.display = rtype == "ssh"
+            w.display = is_ssh
         for w in self.query(".s3-field"):
             w.display = rtype == "s3"
         for w in self.query(".gdrive-field"):
             w.display = rtype == "gdrive"
+        # Toggle key vs password fields based on auth method
+        if is_ssh:
+            auth_sel = self.query_one("#re-auth", Select)
+            auth = str(auth_sel.value) if isinstance(auth_sel.value, str) else "key"
+            for w in self.query(".ssh-key-field"):
+                w.display = auth == "key"
+            for w in self.query(".ssh-password-field"):
+                w.display = auth == "password"
 
     def on_button_pressed(self, event: Button.Pressed) -> None:
         if event.button.id == "btn-cancel":
             self.dismiss(None)
+        elif event.button.id == "btn-browse-key":
+            self.app.push_screen(
+                FilePicker("Select SSH key file", start=str(Path.home() / ".ssh")),
+                callback=self._key_file_selected,
+            )
         elif event.button.id == "btn-save":
             self._save()
 
+    def _key_file_selected(self, path: str | None) -> None:
+        if path:
+            self.query_one("#re-key", Input).value = path
+
     def _save(self) -> None:
         if self._is_new:
             name = self.query_one("#re-name", Input).value.strip()

tui/widgets/__init__.py

@@ -1,3 +1,4 @@
 from tui.widgets.folder_picker import FolderPicker
+from tui.widgets.file_picker import FilePicker
 from tui.widgets.confirm_dialog import ConfirmDialog
 from tui.widgets.operation_log import OperationLog

tui/widgets/file_picker.py

@@ -0,0 +1,46 @@
+from pathlib import Path
+
+from textual.app import ComposeResult
+from textual.screen import ModalScreen
+from textual.widgets import DirectoryTree, Static, Button
+from textual.containers import Horizontal, Vertical
+
+
+class FilePicker(ModalScreen[str | None]):
+
+    BINDINGS = [("escape", "cancel", "Cancel")]
+
+    def __init__(self, title: str = "Select file", start: str = "/"):
+        super().__init__()
+        self._title = title
+        self._start = start
+
+    def compose(self) -> ComposeResult:
+        with Vertical(id="file-picker"):
+            yield Static(self._title, id="fip-title")
+            yield DirectoryTree(self._start, id="fip-tree")
+            with Horizontal(id="fip-buttons"):
+                yield Button("Select", variant="primary", id="fip-select")
+                yield Button("Cancel", variant="default", id="fip-cancel")
+
+    def _get_selected_path(self) -> Path | None:
+        tree = self.query_one("#fip-tree", DirectoryTree)
+        node = tree.cursor_node
+        if node and node.data and node.data.path:
+            return node.data.path
+        return None
+
+    def on_button_pressed(self, event: Button.Pressed) -> None:
+        if event.button.id == "fip-select":
+            path = self._get_selected_path()
+            if path and path.is_file():
+                self.dismiss(str(path))
+            elif path and path.is_dir():
+                self.notify("Please select a file, not a directory", severity="warning")
+            else:
+                self.dismiss(None)
+        else:
+            self.dismiss(None)
+
+    def action_cancel(self) -> None:
+        self.dismiss(None)