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d13a21a734
Echo can interpret operand as an option and checking every variable to be echoed is troublesome while with printf, if the format specifier is present before the operand, printing as string can be enforced.
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 "${rows}"
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unset termios
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exit 0
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fi
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## Non-POSIX compliant and fast.
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stty -echo
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printf '\e7\e[r\033[99999;99999H\e[6n\e8' >/dev/tty
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# shellcheck disable=3045,SC2034
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IFS='[;R' read -r -t 1 -s -d R _ rows cols _ </dev/tty || {
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printf '%s\n' "${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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