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