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Used by `hermes tools` and `hermes skills` for interactive checklists.
Provides a curses multi-select with keyboard navigation, plus a
text-based numbered fallback for terminals without curses support.
"""
import sys
from typing import Callable, List, Optional, Set
from hermes_cli.colors import Colors, color
def flush_stdin() -> None:
"""Flush any stray bytes from the stdin input buffer.
Must be called after ``curses.wrapper()`` (or any terminal-mode library
like simple_term_menu) returns, **before** the next ``input()`` /
``getpass.getpass()`` call. ``curses.endwin()`` restores the terminal
but does NOT drain the OS input buffer — leftover escape-sequence bytes
(from arrow keys, terminal mode-switch responses, or rapid keypresses)
remain buffered and silently get consumed by the next ``input()`` call,
corrupting user data (e.g. writing ``^[^[`` into .env files).
On non-TTY stdin (piped, redirected) or Windows, this is a no-op.
"""
try:
if not sys.stdin.isatty():
return
import termios
termios.tcflush(sys.stdin, termios.TCIFLUSH)
except Exception:
pass
def curses_checklist(
title: str,
items: List[str],
selected: Set[int],
*,
cancel_returns: Set[int] | None = None,
status_fn: Optional[Callable[[Set[int]], str]] = None,
) -> Set[int]:
"""Curses multi-select checklist. Returns set of selected indices.
Args:
title: Header line displayed above the checklist.
items: Display labels for each row.
selected: Indices that start checked (pre-selected).
cancel_returns: Returned on ESC/q. Defaults to the original *selected*.
status_fn: Optional callback ``f(chosen_indices) -> str`` whose return
value is rendered on the bottom row of the terminal. Use this for
live aggregate info (e.g. estimated token counts).
"""
if cancel_returns is None:
cancel_returns = set(selected)
# Safety: curses and input() both hang or spin when stdin is not a
# terminal (e.g. subprocess pipe). Return defaults immediately.
if not sys.stdin.isatty():
return cancel_returns
try:
import curses
chosen = set(selected)
result_holder: list = [None]
def _draw(stdscr):
curses.curs_set(0)
if curses.has_colors():
curses.start_color()
curses.use_default_colors()
curses.init_pair(1, curses.COLOR_GREEN, -1)
curses.init_pair(2, curses.COLOR_YELLOW, -1)
curses.init_pair(3, 8, -1) # dim gray
cursor = 0
scroll_offset = 0
while True:
stdscr.clear()
max_y, max_x = stdscr.getmaxyx()
# Reserve bottom row for status bar when status_fn provided
footer_rows = 1 if status_fn else 0
# Header
try:
hattr = curses.A_BOLD
if curses.has_colors():
hattr |= curses.color_pair(2)
stdscr.addnstr(0, 0, title, max_x - 1, hattr)
stdscr.addnstr(
1, 0,
" ↑↓ navigate SPACE toggle ENTER confirm ESC cancel",
max_x - 1, curses.A_DIM,
)
except curses.error:
pass
# Scrollable item list
visible_rows = max_y - 3 - footer_rows
if cursor < scroll_offset:
scroll_offset = cursor
elif cursor >= scroll_offset + visible_rows:
scroll_offset = cursor - visible_rows + 1
for draw_i, i in enumerate(
range(scroll_offset, min(len(items), scroll_offset + visible_rows))
):
y = draw_i + 3
if y >= max_y - 1 - footer_rows:
break
check = "✓" if i in chosen else " "
arrow = "→" if i == cursor else " "
line = f" {arrow} [{check}] {items[i]}"
attr = curses.A_NORMAL
if i == cursor:
attr = curses.A_BOLD
if curses.has_colors():
attr |= curses.color_pair(1)
try:
stdscr.addnstr(y, 0, line, max_x - 1, attr)
except curses.error:
pass
# Status bar (bottom row, right-aligned)
if status_fn:
try:
status_text = status_fn(chosen)
if status_text:
# Right-align on the bottom row
sx = max(0, max_x - len(status_text) - 1)
sattr = curses.A_DIM
if curses.has_colors():
sattr |= curses.color_pair(3)
stdscr.addnstr(max_y - 1, sx, status_text, max_x - sx - 1, sattr)
except curses.error:
pass
stdscr.refresh()
key = stdscr.getch()
if key in (curses.KEY_UP, ord("k")):
cursor = (cursor - 1) % len(items)
elif key in (curses.KEY_DOWN, ord("j")):
cursor = (cursor + 1) % len(items)
elif key == ord(" "):
chosen.symmetric_difference_update({cursor})
elif key in (curses.KEY_ENTER, 10, 13):
result_holder[0] = set(chosen)
return
elif key in (27, ord("q")):
result_holder[0] = cancel_returns
return
curses.wrapper(_draw)
flush_stdin()
return result_holder[0] if result_holder[0] is not None else cancel_returns
except Exception:
return _numbered_fallback(title, items, selected, cancel_returns, status_fn)
def curses_radiolist(
title: str,
items: List[str],
selected: int = 0,
*,
cancel_returns: int | None = None,
) -> int:
"""Curses single-select radio list. Returns the selected index.
Args:
title: Header line displayed above the list.
items: Display labels for each row.
selected: Index that starts selected (pre-selected).
cancel_returns: Returned on ESC/q. Defaults to the original *selected*.
"""
if cancel_returns is None:
cancel_returns = selected
if not sys.stdin.isatty():
return cancel_returns
try:
import curses
result_holder: list = [None]
def _draw(stdscr):
curses.curs_set(0)
if curses.has_colors():
curses.start_color()
curses.use_default_colors()
curses.init_pair(1, curses.COLOR_GREEN, -1)
curses.init_pair(2, curses.COLOR_YELLOW, -1)
cursor = selected
scroll_offset = 0
while True:
stdscr.clear()
max_y, max_x = stdscr.getmaxyx()
# Header
try:
hattr = curses.A_BOLD
if curses.has_colors():
hattr |= curses.color_pair(2)
stdscr.addnstr(0, 0, title, max_x - 1, hattr)
stdscr.addnstr(
1, 0,
" \u2191\u2193 navigate ENTER/SPACE select ESC cancel",
max_x - 1, curses.A_DIM,
)
except curses.error:
pass
# Scrollable item list
visible_rows = max_y - 4
if cursor < scroll_offset:
scroll_offset = cursor
elif cursor >= scroll_offset + visible_rows:
scroll_offset = cursor - visible_rows + 1
for draw_i, i in enumerate(
range(scroll_offset, min(len(items), scroll_offset + visible_rows))
):
y = draw_i + 3
if y >= max_y - 1:
break
radio = "\u25cf" if i == selected else "\u25cb"
arrow = "\u2192" if i == cursor else " "
line = f" {arrow} ({radio}) {items[i]}"
attr = curses.A_NORMAL
if i == cursor:
attr = curses.A_BOLD
if curses.has_colors():
attr |= curses.color_pair(1)
try:
stdscr.addnstr(y, 0, line, max_x - 1, attr)
except curses.error:
pass
stdscr.refresh()
key = stdscr.getch()
if key in (curses.KEY_UP, ord("k")):
cursor = (cursor - 1) % len(items)
elif key in (curses.KEY_DOWN, ord("j")):
cursor = (cursor + 1) % len(items)
elif key in (ord(" "), curses.KEY_ENTER, 10, 13):
result_holder[0] = cursor
return
elif key in (27, ord("q")):
result_holder[0] = cancel_returns
return
curses.wrapper(_draw)
flush_stdin()
return result_holder[0] if result_holder[0] is not None else cancel_returns
except Exception:
return _radio_numbered_fallback(title, items, selected, cancel_returns)
def _radio_numbered_fallback(
title: str,
items: List[str],
selected: int,
cancel_returns: int,
) -> int:
"""Text-based numbered fallback for radio selection."""
print(color(f"\n {title}", Colors.YELLOW))
print(color(" Select by number, Enter to confirm.\n", Colors.DIM))
for i, label in enumerate(items):
marker = color("(\u25cf)", Colors.GREEN) if i == selected else "(\u25cb)"
print(f" {marker} {i + 1:>2}. {label}")
print()
try:
val = input(color(f" Choice [default {selected + 1}]: ", Colors.DIM)).strip()
if not val:
return selected
idx = int(val) - 1
if 0 <= idx < len(items):
return idx
return selected
except (ValueError, KeyboardInterrupt, EOFError):
return cancel_returns
def curses_single_select(
title: str,
items: List[str],
default_index: int = 0,
*,
cancel_label: str = "Cancel",
) -> int | None:
"""Curses single-select menu. Returns selected index or None on cancel.
Works inside prompt_toolkit because curses.wrapper() restores the terminal
safely, unlike simple_term_menu which conflicts with /dev/tty.
"""
if not sys.stdin.isatty():
return None
try:
import curses
result_holder: list = [None]
all_items = list(items) + [cancel_label]
cancel_idx = len(items)
def _draw(stdscr):
curses.curs_set(0)
if curses.has_colors():
curses.start_color()
curses.use_default_colors()
curses.init_pair(1, curses.COLOR_GREEN, -1)
curses.init_pair(2, curses.COLOR_YELLOW, -1)
cursor = min(default_index, len(all_items) - 1)
scroll_offset = 0
while True:
stdscr.clear()
max_y, max_x = stdscr.getmaxyx()
try:
hattr = curses.A_BOLD
if curses.has_colors():
hattr |= curses.color_pair(2)
stdscr.addnstr(0, 0, title, max_x - 1, hattr)
stdscr.addnstr(
1, 0,
" ↑↓ navigate ENTER confirm ESC/q cancel",
max_x - 1, curses.A_DIM,
)
except curses.error:
pass
visible_rows = max_y - 3
if cursor < scroll_offset:
scroll_offset = cursor
elif cursor >= scroll_offset + visible_rows:
scroll_offset = cursor - visible_rows + 1
for draw_i, i in enumerate(
range(scroll_offset, min(len(all_items), scroll_offset + visible_rows))
):
y = draw_i + 3
if y >= max_y - 1:
break
arrow = "→" if i == cursor else " "
line = f" {arrow} {all_items[i]}"
attr = curses.A_NORMAL
if i == cursor:
attr = curses.A_BOLD
if curses.has_colors():
attr |= curses.color_pair(1)
try:
stdscr.addnstr(y, 0, line, max_x - 1, attr)
except curses.error:
pass
stdscr.refresh()
key = stdscr.getch()
if key in (curses.KEY_UP, ord("k")):
cursor = (cursor - 1) % len(all_items)
elif key in (curses.KEY_DOWN, ord("j")):
cursor = (cursor + 1) % len(all_items)
elif key in (curses.KEY_ENTER, 10, 13):
result_holder[0] = cursor
return
elif key in (27, ord("q")):
result_holder[0] = None
return
curses.wrapper(_draw)
flush_stdin()
if result_holder[0] is not None and result_holder[0] >= cancel_idx:
return None
return result_holder[0]
except Exception:
all_items = list(items) + [cancel_label]
cancel_idx = len(items)
return _numbered_single_fallback(title, all_items, cancel_idx)
def _numbered_single_fallback(
title: str,
items: List[str],
cancel_idx: int,
) -> int | None:
"""Text-based numbered fallback for single-select."""
print(f"\n {title}\n")
for i, label in enumerate(items, 1):
print(f" {i}. {label}")
print()
try:
val = input(f" Choice [1-{len(items)}]: ").strip()
if not val:
return None
idx = int(val) - 1
if 0 <= idx < len(items) and idx < cancel_idx:
return idx
if idx == cancel_idx:
return None
except (ValueError, KeyboardInterrupt, EOFError):
pass
return None
def _numbered_fallback(
title: str,
items: List[str],
selected: Set[int],
cancel_returns: Set[int],
status_fn: Optional[Callable[[Set[int]], str]] = None,
) -> Set[int]:
"""Text-based toggle fallback for terminals without curses."""
chosen = set(selected)
print(color(f"\n {title}", Colors.YELLOW))
print(color(" Toggle by number, Enter to confirm.\n", Colors.DIM))
while True:
for i, label in enumerate(items):
marker = color("[✓]", Colors.GREEN) if i in chosen else "[ ]"
print(f" {marker} {i + 1:>2}. {label}")
if status_fn:
status_text = status_fn(chosen)
if status_text:
print(color(f"\n {status_text}", Colors.DIM))
print()
try:
val = input(color(" Toggle # (or Enter to confirm): ", Colors.DIM)).strip()
if not val:
break
idx = int(val) - 1
if 0 <= idx < len(items):
chosen.symmetric_difference_update({idx})
except (ValueError, KeyboardInterrupt, EOFError):
return cancel_returns
print()
return chosen
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