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prezto/modules/helper/functions/add-zsh-trap

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#
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# Provides for trapping UNIX signals and calling callback functions when a trap
# is triggered.
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#
# Authors:
# Sorin Ionescu <sorin.ionescu@gmail.com>
#
# Adds a function name to a list to be called when a trap is triggered.
function add-zsh-trap {
if (( $# < 2 )); then
print "usage: $0 type function" >&2
return 1
fi
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if [[ -z "$signals[(r)$1]" ]]; then
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print "$0: unknown signal: $1" >&2
return 1
fi
local trap_functions="TRAP${1}_FUNCTIONS"
if (( ! ${(P)+trap_functions} )); then
typeset -gaU "$trap_functions"
fi
eval "$trap_functions+="$2""
if (( ! $+functions[TRAP${1}] )); then
eval "
function TRAP${1} {
for trap_function in \"\$TRAP${1}_FUNCTIONS[@]\"; do
if (( \$+functions[\$trap_function] )); then
\"\$trap_function\" \"\$1\"
fi
done
return \$(( 128 + \$1 ))
}
"
fi
}
add-zsh-trap "$@"