mirror of
https://github.com/gaschz/dotfiles.git
synced 2025-11-01 20:19:00 +01:00
45a0acb222
- Standardize capability usage with the terminfo database for portability. POSIX tput does declare only the basic options such as 'init', 'reset' and 'clear', leaving the rest unspecified, that is not ideal but hard coding escape sequences is way worse. - Set colorization options based on number of colors the terminal supports and not the TERM variable when possible. This is incomplete, terminal emulators may support or adapt more than it is advertised, but involves using DECRQSS queries and delays, as an example, 'resize' utility from XTerm uses 3 seconds as delay, this is worrisome. - Term with only '-direct' variants without ending with 256 means it only supports direct-color indexing, therefore 'tmux-direct' cannot be used, but the non-multiplexer terminal 'xterm-direct256' can.
106 lines
2.8 KiB
Bash
Executable File
106 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
|
|
|
|
## SPDX-FileCopyrightText: 2024 - 2025 Benjamin Grande M. S. <ben.grande.b@gmail.com>
|
|
##
|
|
## SPDX-License-Identifier: GFDL-1.3-or-later
|
|
##
|
|
## Credits: https://wiki.archlinux.org/title/Working_with_the_serial_console#Resizing_a_terminal
|
|
##
|
|
## Resize terminal columns and lines to current window size.
|
|
## Useful for terminals over link (serial console, socat's pty etc).
|
|
|
|
if test -n "${TERM_RESIZE_DISABLE:-}"; then
|
|
exit 0
|
|
fi
|
|
|
|
test -t 0 || exit 0
|
|
case "${TERM-}" in
|
|
dumb) exit 0;;
|
|
*);;
|
|
esac
|
|
|
|
## If argument is provided, allow user to bypass tty check.
|
|
if test "${#}" -eq 0; then
|
|
## Shells on graphical sessions (terminal emulators) are skipped.
|
|
test "${XDG_SESSION_TYPE:-}" = "tty" || exit 0
|
|
## Serial ports and devices are desired.
|
|
term_file="$(tty)"
|
|
term_file_wanted="ttyUSB ttyS"
|
|
## Consoles are desired.
|
|
if test -r /sys/class/tty/console/active; then
|
|
active_console="$(cat -- /sys/class/tty/console/active)"
|
|
term_file_wanted="${term_file_wanted} ${active_console}"
|
|
unset active_console
|
|
fi
|
|
term_file_active=0
|
|
for tf in $(printf '%s' "${term_file_wanted}"); do
|
|
case "${term_file}" in
|
|
*"/${tf}"*) term_file_active=1;;
|
|
*) ;;
|
|
esac
|
|
done
|
|
unset tf term_file term_file_wanted
|
|
## Terminal can handle screen resizing by itself.
|
|
if test "${term_file_active}" = "0"; then
|
|
unset term_file_active
|
|
exit 0
|
|
fi
|
|
unset term_file_active
|
|
fi
|
|
|
|
get_caps(){
|
|
sc="$(tput sc || printf '%b' '\0337')"
|
|
rc="$(tput rc || printf '%b' '\0338')"
|
|
cup="$(tput cup 99999 99999 || printf '%b' '\033[99999;99999H')"
|
|
csr="$(tput csr || printf '%b' '\033[r')"
|
|
gc="$(tput u7 || printf '%b' '\033[6n')"
|
|
}
|
|
|
|
## POSIX compliant.
|
|
# shellcheck disable=SC3045
|
|
if ! (printf '%s\n' "R" | read -r -t 1 -sd R 2>/dev/null); then
|
|
## Fast but depends on XTerm.
|
|
if has resize; then
|
|
resize_cmd="$(resize)"
|
|
eval "${resize_cmd}" >/dev/null
|
|
exit 0
|
|
fi
|
|
## Slow due to heavy stty calls.
|
|
get_caps
|
|
termios="$(stty -g)"
|
|
stty raw -echo min 0 time 1
|
|
printf '%s' "${sc}${csr}${cup}${gc}${rc}" >/dev/tty
|
|
IFS='[;R' read -r _ rows cols _ </dev/tty
|
|
stty "${termios}" cols "${cols}" rows "${rows}"
|
|
unset termios
|
|
exit 0
|
|
fi
|
|
|
|
msg_unsupported="error: cannot resize screen: unsupported terminal emulator"
|
|
## Non-POSIX compliant and fast.
|
|
get_caps
|
|
stty -echo
|
|
printf '%s' "${sc}${csr}${cup}${gc}${rc}" >/dev/tty
|
|
# shellcheck disable=3045,SC2034
|
|
IFS='[;R' read -r -t 1 -s -d R _ rows cols _ </dev/tty || {
|
|
printf '%s\n' "${msg_unsupported}" >&2
|
|
stty echo
|
|
unset rows cols
|
|
exit 1
|
|
}
|
|
|
|
if test "${COLUMNS}" = "${cols}" && test "${LINES}" = "${rows}";then
|
|
stty echo
|
|
unset rows cols
|
|
exit 0
|
|
elif test "${rows}" -gt 0 && test "${cols}" -gt 0;then
|
|
stty echo cols "${cols}" rows "${rows}"
|
|
unset rows cols
|
|
exit 0
|
|
fi
|
|
|
|
printf '%s\n' "${msg_unsupported}" >&2
|
|
stty echo
|
|
unset rows cols
|
|
exit 1
|