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93 lines
2.5 KiB
Bash
Executable File
93 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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## SPDX-FileCopyrightText: 2024 Benjamin Grande M. S. <ben.grande.b@gmail.com>
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##
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## SPDX-License-Identifier: GFDL-1.3-or-later
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##
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## Credits: https://wiki.archlinux.org/title/Working_with_the_serial_console#Resizing_a_terminal
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##
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## Resize terminal columns and lines to current window size.
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## Useful for terminals over link (serial console, socat's pty etc).
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if test -n "${TERM_RESIZE_DISABLE:-}"; then
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exit 0
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fi
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test -t 0 || exit 0
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msg_unsupported="error: cannot resize screen: unsupported terminal emulator"
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## If argument is provided, allow user to bypass tty check.
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if test "${#}" -eq 0; then
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## Shells on graphical sessions (terminal emulators) are skipped.
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test "${XDG_SESSION_TYPE:-}" = "tty" || exit 0
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## Serial ports and devices are desired.
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term_file="$(tty)"
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term_file_wanted="ttyUSB ttyS"
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## Consoles are desired.
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if test -r /sys/class/tty/console/active; then
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active_console="$(cat -- /sys/class/tty/console/active)"
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term_file_wanted="${term_file_wanted} ${active_console}"
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unset active_console
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fi
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term_file_active=0
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for tf in $(printf '%s' "${term_file_wanted}"); do
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case "${term_file}" in
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*"/${tf}"*) term_file_active=1;;
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*) ;;
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esac
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done
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unset tf term_file term_file_wanted
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## Terminal can handle screen resizing by itself.
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if test "${term_file_active}" = "0"; then
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unset term_file_active
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exit 0
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fi
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unset term_file_active
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fi
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## POSIX compliant.
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# shellcheck disable=SC3045
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if ! printf '%s\n' "R" | read -r -t 1 -sd R 2>/dev/null; then
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## Fast but depends on XTerm.
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if has resize; then
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resize_cmd="$(resize)"
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eval "${resize_cmd}" >/dev/null
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exit 0
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fi
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## Slow due to heavy stty calls.
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termios="$(stty -g)"
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stty raw -echo min 0 time 1
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printf '\0337\033[r\033[99999;99999H\033[6n\0338' >/dev/tty
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IFS='[;R' read -r _ rows cols _ </dev/tty
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stty "${termios}" cols "${cols}" rows "${rows}"
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unset termios
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exit 0
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fi
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## Non-POSIX compliant and fast.
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stty -echo
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printf '\0337\033[r\033[99999;99999H\033[6n\0338' >/dev/tty
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# shellcheck disable=3045,SC2034
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IFS='[;R' read -r -t 1 -s -d R _ rows cols _ </dev/tty || {
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printf '%s\n' "${msg_unsupported}" >&2
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stty echo
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unset rows cols
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exit 1
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}
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if test "${COLUMNS}" = "${cols}" && test "${LINES}" = "${rows}";then
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stty echo
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unset rows cols
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exit 0
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elif test "${rows}" -gt 0 && test "${cols}" -gt 0;then
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stty echo cols "${cols}" rows "${rows}"
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unset rows cols
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exit 0
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fi
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printf '%s\n' "${msg_unsupported}" >&2
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stty echo
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unset rows cols
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exit 1
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