rootiest
608b0227cb
fish's `read` invokes its interactive line editor on a TTY, which (1) prints a `read> ` prompt below the panel, (2) intercepts Tab and arrow keys for its own line editing so they never reach the switch, and (3) shifts the cursor down a line, throwing off the `\e[14A` redraw so top borders stacked on every keypress. Plain keys (j/k/q/space) passed through, masking the problem. Add __config_toggle_read_key: puts the terminal in raw, no-echo mode (`stty raw -echo min 1 time 1`), reads one keypress from /dev/tty, and returns a normalized token (up/down/left/right/tab/space/escape/quit or the literal char) by decoding the bytes via od. Arrow keys and Tab now work, there is no stray prompt, and the redraw stays aligned. Ctrl-C in raw mode arrives as byte 3 and maps to quit; bare Esc exits after the 0.1s inter-byte timer. Rewrite the event loop to consume these tokens and restore Esc to the help text.
90 lines
3.0 KiB
Fish
90 lines
3.0 KiB
Fish
# Copyright (C) 2026 Rootiest
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# SPDX-License-Identifier: AGPL-3.0-or-later
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# SYNOPSIS
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# __config_toggle_read_key
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#
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# DESCRIPTION
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# Reads a single keypress directly from the controlling terminal in raw
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# mode and echoes a normalized token naming the key. Bypasses fish's
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# `read` builtin, whose interactive line editor swallows Tab and arrow
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# keys (and prints a `read> ` prompt) — none of which is usable for a TUI.
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#
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# The terminal is put into raw, no-echo mode with a 0.1s inter-byte timer
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# (`stty raw -echo min 1 time 1`) so a multi-byte escape sequence (e.g.
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# an arrow key, ESC [ A) is captured in one read while a lone key returns
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# promptly. Original terminal settings are always restored before return.
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#
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# In raw mode Ctrl-C does not raise SIGINT; it arrives as byte 3 (ETX),
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# which is reported as the token "quit".
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#
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# ARGUMENTS
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# (none)
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#
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# RETURNS
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# 0 A key was read; one of these tokens is printed to stdout:
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# up down left right arrow keys
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# space tab enter escape
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# quit Ctrl-C (byte 3) in raw mode
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# <char> any other single printable character
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# "" nothing decodable was read
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# 1 The terminal could not be put into raw mode (stdin is not a TTY)
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#
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# EXAMPLE
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# set -l key (__config_toggle_read_key)
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# or return # not a TTY — bail
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# switch $key
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# case up; echo "moved up"
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# case space; echo "toggled"
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# end
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function __config_toggle_read_key
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# Snapshot current terminal settings; failure means stdin is not a TTY.
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set -l saved (stty -g </dev/tty 2>/dev/null)
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or return 1
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# Raw, no-echo. min 1 / time 1: block for the first byte, then wait up to
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# 0.1s for the rest of a burst (escape sequence) before returning.
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stty raw -echo min 1 time 1 </dev/tty 2>/dev/null
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# One read() of up to 3 bytes — covers ESC [ A style sequences. od emits
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# the bytes as space-separated decimal codes.
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set -l codes (dd if=/dev/tty bs=3 count=1 2>/dev/null \
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| od -An -tu1 2>/dev/null | string trim | string split -n ' ')
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# Restore the terminal before doing anything else.
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stty $saved </dev/tty 2>/dev/null
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switch (string join ' ' $codes)
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case '27 91 65'
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echo up
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case '27 91 66'
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echo down
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case '27 91 67'
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echo right
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case '27 91 68'
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echo left
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case 27
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echo escape
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case 9
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echo tab
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case 32
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echo space
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case 10 13
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echo enter
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case 3
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echo quit
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case ''
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echo ''
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case '*'
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# Single printable byte → emit its character; ignore stray
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# multi-byte sequences we do not recognise. The two-step octal
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# form avoids fish mangling a one-shot '\\%03o' format string.
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if test (count $codes) -eq 1
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set -l oct (printf '%03o' $codes[1])
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printf '%b\n' "\\$oct"
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else
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echo ''
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end
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end
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end
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