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# Add to HOOK the given FUNCTION.
# HOOK is one of chpwd, precmd, preexec, periodic, zshaddhistory,
# zshexit, zsh_directory_name (the _functions subscript is not required).
#
# With -d, remove the function from the hook instead; delete the hook
# variable if it is empty.
#
# -D behaves like -d, but pattern characters are active in the
# function name, so any matching function will be deleted from the hook.
#
# Without -d, the FUNCTION is marked for autoload; -U is passed down to
# autoload if that is given, as are -z and -k. (This is harmless if the
# function is actually defined inline.)
emulate -L zsh
local -a hooktypes
hooktypes=(
chpwd precmd preexec periodic zshaddhistory zshexit
zsh_directory_name
)
local opt
local -a autoopts
integer del
while getopts "dDUzk" opt; do
case $opt in
(d)
del=1
;;
(D)
del=2
;;
([Uzk])
autoopts+=(-$opt)
;;
(*)
return 1
;;
esac
done
shift $(( OPTIND - 1 ))
if (( $# != 2 || ${hooktypes[(I)$1]} == 0 )); then
print "Usage: $0 hook function\nValid hooks are:\n $hooktypes"
return 1
fi
local hook="${1}_functions"
local fn="$2"
if (( del )); then
# delete, if hook is set
if (( ${(P)+hook} )); then
if (( del == 2 )); then
set -A $hook ${(P)hook:#${~fn}}
else
set -A $hook ${(P)hook:#$fn}
fi
# unset if no remaining entries --- this can give better
# performance in some cases
if (( ! ${(P)#hook} )); then
unset $hook
fi
fi
else
if (( ${(P)+hook} )); then
if (( ${${(P)hook}[(I)$fn]} == 0 )); then
set -A $hook ${(P)hook} $fn
fi
else
set -A $hook $fn
fi
autoload $autoopts -- $fn
fi
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