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bash: move __ghostty_preexec_hook into __ghostty_hook (#11674)

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We previously used a readonly variable (__ghostty_ps0) to define the
best __ghostty_preexec_hook expansion for the current bash version.

This worked pretty well, but it had the downside of managing another
variable (#11258).

We can instead simplify this a bit by moving this into __ghostty_hook. I
didn't take that approach originally because I wanted to avoid the bash
version check on each command, but slightly loosening our guard check to
just look for "__ghostty_preexec_hook" (rather than the full expansion
expression) means we can bury the bash version check to the cold path.

One small gap here is that we may not update PS0 to the correct syntax
if we start switching between significantly different bash versions in
interactive subshells, but that seems like a pretty rare case to handle
given the benefits of this approach.
This commit is contained in:
Mitchell Hashimoto
2026-03-19 20:13:46 -07:00
committed by GitHub
parent d2a29de959 2a952b4dfe
commit 7966740b48
1 changed files with 11 additions and 15 deletions
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26
src/shell-integration/bash/ghostty.bash
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@@ -278,24 +278,20 @@ if (( BASH_VERSINFO[0] > 4 || (BASH_VERSINFO[0] == 4 && BASH_VERSINFO[1] >= 4) )
[[ -n "$cmd" ]] && __ghostty_preexec "$cmd"
}
# Use function substitution in 5.3+. Otherwise, use command substitution.
# Any output (including escape sequences) goes to the terminal.
# Only define if not already set (allows re-sourcing).
if [[ -z "${__ghostty_ps0+x}" ]]; then
if (( BASH_VERSINFO[0] > 5 || (BASH_VERSINFO[0] == 5 && BASH_VERSINFO[1] >= 3) )); then
# shellcheck disable=SC2016
builtin readonly __ghostty_ps0='${ __ghostty_preexec_hook; }'
else
# shellcheck disable=SC2016
builtin readonly __ghostty_ps0='$(__ghostty_preexec_hook >/dev/tty)'
fi
fi
__ghostty_hook() {
builtin local ret=$?
__ghostty_precmd "$ret"
if [[ "$PS0" != *"$__ghostty_ps0"* ]]; then
PS0=$PS0"${__ghostty_ps0}"
# Append preexec hook to PS0 if not already present.
# Use function substitution in 5.3+, otherwise command substitution.
if [[ "$PS0" != *"__ghostty_preexec_hook"* ]]; then
if (( BASH_VERSINFO[0] > 5 || (BASH_VERSINFO[0] == 5 && BASH_VERSINFO[1] >= 3) )); then
# shellcheck disable=SC2016
PS0+='${ __ghostty_preexec_hook; }'
else
# shellcheck disable=SC2016
PS0+='$(__ghostty_preexec_hook >/dev/tty)'
fi
fi
}