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# /etc/bash/bashrc.d/10-gentoo-title.bash
# For information regarding the control sequences used, please refer to
# https://invisible-island.net/xterm/ctlseqs/ctlseqs.html.
genfun_set_win_title() {
# Advertise the fact that the presently running interactive shell will
# update the title. Doing so allows for its subprocesses to determine
# whether it is safe to set the title of their own accord. Note that 0
# refers to the value of Ps within the OSC Ps ; Pt BEL sequence.
export SHELL_SETS_TITLE=0
# Sets the window title with the Set Text Parameters control sequence.
# For screen, the sequence defines the hardstatus (%h) and for tmux, the
# pane_title (#T). For graphical terminal emulators, it is normal for
# the title bar to be affected.
genfun_set_win_title() {
local prompt
if [[ ${PROMPT_DIRTRIM} ]]; then
# Respect the value of PROMPT_DIRTRIM. If set as 0, the
# current working directory shall be shown in full.
prompt='\u@\h \w'
else
# Show the basename of the current working directory.
prompt='\u@\h \W'
fi
printf '\033]0;%s\007' "${prompt@P}"
}
genfun_set_win_title
}
unset -v SHELL_SETS_TITLE
# Determine whether the terminal can handle the Set Text Parameters sequence.
# The only terminals permitted here are those for which there is empirical
# evidence that the sequence is supported and that the UTF-8 character encoding
# is handled correctly. Quite rightly, this precludes many vintage terminals.
case ${TERM} in
alacritty*|contour|foot*|tmux*|xterm-ghostty)
# The terminal emulator also supports XTWINOPS. If the PTY was
# created by sshd(8) then push the current window title to the
# stack and arrange for it to be popped upon exiting. Xterm also
# supports this but there are far too many terminal emulators
# that falsely identify as being xterm-compatible.
if [[ ${SSH_TTY} && ${SSH_TTY} == "$(tty)" ]]; then
trap 'printf "\033[23;0t"' EXIT
printf '\033[22;0t'
fi
;;
rxvt-unicode*|st-256color|xterm*)
# If the PTY was created by sshd(8) then proceed no further.
# Alas, there exist many operating environments in which the
# title would otherwise not be restored upon ssh(1) exiting.
# Those wanting for the title to be set regardless may adjust
# ~/.bashrc or create a bashrc.d drop-in to set PROMPT_COMMAND.
# For example, PROMPT_COMMAND=(genfun_set_win_title).
if [[ ${SSH_TTY} && ${SSH_TTY} == "$(tty)" ]]; then
return
fi
;;
screen*)
# If the PTY was created by sshd(8) and screen(1) was launched
# prior to the SSH session beginning, as opposed to afterwards,
# proceed no further. It is another case in which there would be
# no guarantee of the title being restored upon ssh(1) exiting.
if [[ ! ${WINDOW} && ${SSH_TTY} && ${SSH_TTY} == "$(tty)" ]]; then
return
fi
;;
*)
return
esac
# Arrange for the title to be updated each time the primary prompt is displayed.
PROMPT_COMMAND+=('genfun_set_win_title')
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