feat: settings menu in tui

1 files changed, 106 insertions, 0 deletions

diff --git a/ui/tui.py b/ui/tui.py
index c73fb09..9047f36 100644
--- a/ui/tui.py
+++ b/ui/tui.py
@@ -726,6 +726,112 @@ def line_edit(scr, title: str, default: str,
 
 
 # ---------------------------------------------------------------------------
+# Widget: multi-field settings form with Save/Cancel buttons
+# ---------------------------------------------------------------------------
+
+def form(scr, title: str, fields: Sequence[dict],
+         back_value: object = None,
+         help_lines: Optional[Sequence[str]] = None) -> Optional[dict]:
+    """Edit several labeled fields on one screen, then Save or Cancel.
+
+    FIELDS is a list of dicts, one per row, shaped like::
+
+        {"key": "audio_format", "label": "Audio format",
+         "kind": "choice", "value": "m4b",
+         "choices": ["mp3", "m4b", "ogg", "flac"]}
+        {"key": "chunk_size", "label": "Chunk size",
+         "kind": "text", "value": "250",
+         "validate": lambda s: None if s.isdigit() else "digits only"}
+
+    Each field renders as a left-justified ``Label:  value`` row. Up/Down
+    (or k/j) move the cursor; Enter on a ``choice`` row opens a single
+    choice menu, Enter on a ``text`` row opens a line editor (reusing its
+    VALIDATE for that one field). Tab or the arrow keys move focus to the
+    Save/Cancel buttons; Enter on Save validates every text field (the
+    first failure flashes in red and re-focuses that row) and returns
+    ``{key: value}``, Enter on Cancel returns BACK_VALUE. Esc (or 'q')
+    returns BACK_VALUE / aborts as in menu(). Values are edited in place
+    in the FIELDS dicts, so Cancel simply discards them.
+    """
+    if not fields:
+        raise ValueError("form() needs at least one field")
+    frame = Frame(scr, title,
+                  "Up/Down = move  Enter = edit  Tab = Save/Cancel  "
+                  "Esc = cancel")
+    cursor = 0
+    on_buttons = False
+    btn_index = 0
+    edit_cancel = object()  # sentinel: backed out of a field editor
+    while True:
+        frame.rows = []
+        for line in help_lines or []:
+            frame.mark(line, frame.theme["dim"])
+        if help_lines:
+            frame.mark("")
+        base = len(frame.rows)
+        for field in fields:
+            frame.mark(f"{field['label']}:  {field['value']}",
+                       selectable=True, align="left")
+        frame.cursor = None if on_buttons else base + cursor
+        frame.buttons = (["Save", "Cancel"], btn_index if on_buttons else None)
+        frame.draw()
+        curses = frame.curses
+        key = frame.get_key(cancel_keys=())
+        if key == 27 and back_value is not None:
+            return back_value
+        if key in _CANCEL_KEYS:
+            raise WizardCancelled()
+        if on_buttons:
+            if key in (9, curses.KEY_BTAB, curses.KEY_UP, curses.KEY_DOWN):
+                on_buttons = False
+            elif key in (curses.KEY_LEFT, curses.KEY_RIGHT,
+                         ord("h"), ord("l")):
+                btn_index = 1 - btn_index
+            elif key in (10, 13):
+                if btn_index == 0:  # Save
+                    for index, field in enumerate(fields):
+                        validate = field.get("validate")
+                        if field.get("kind") == "text" and validate:
+                            error = validate(field["value"])
+                            if error is not None:
+                                on_buttons = False
+                                cursor = index
+                                frame.flash(error, "err")
+                                break
+                    else:
+                        return {field["key"]: field["value"]
+                                for field in fields}
+                else:  # Cancel
+                    return back_value
+        else:
+            moved = frame.motion(key, cursor, len(fields), wrap=True)
+            if moved is not None:
+                cursor = moved
+            elif key in (9, curses.KEY_BTAB, curses.KEY_LEFT,
+                         curses.KEY_RIGHT, ord("h"), ord("l")):
+                on_buttons = True
+                btn_index = 0
+            elif key in (10, 13):
+                field = fields[cursor]
+                if field.get("kind") == "choice":
+                    choices = list(field.get("choices") or [])
+                    default = choices.index(field["value"]) \
+                        if field["value"] in choices else 0
+                    chosen = menu(scr, field["label"],
+                                  [(c, c) for c in choices],
+                                  default_index=default,
+                                  back_value=edit_cancel)
+                    if chosen is not edit_cancel:
+                        field["value"] = chosen
+                else:
+                    edited = line_edit(scr, field["label"], field["value"],
+                                       validate=field.get("validate"),
+                                       back_value=edit_cancel)
+                    if edited is not edit_cancel:
+                        field["value"] = edited
+
+
+# ---------------------------------------------------------------------------
 # Widget: directory browser
 # ---------------------------------------------------------------------------