/usr/share/zsh/functions/Misc/add-zsh-hook is in zsh-common 5.1.1-1ubuntu2.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | # 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 usage="Usage: $0 hook function\nValid hooks are:\n $hooktypes"
local opt
local -a autoopts
integer del list help
while getopts "dDhLUzk" opt; do
case $opt in
(d)
del=1
;;
(D)
del=2
;;
(h)
help=1
;;
(L)
list=1
;;
([Uzk])
autoopts+=(-$opt)
;;
(*)
return 1
;;
esac
done
shift $(( OPTIND - 1 ))
if (( list )); then
typeset -mp "(${1:-${(@j:|:)hooktypes}})_functions"
return $?
elif (( help || $# != 2 || ${hooktypes[(I)$1]} == 0 )); then
print -u$(( 2 - help )) $usage
return $(( 1 - help ))
fi
local hook="${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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