67 lines
1.6 KiB
Bash
67 lines
1.6 KiB
Bash
#
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# Defines helper functions.
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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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# Checks if a file can be autoloaded by trying to load it in a subshell.
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function autoloadable() {
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( unfunction $1 ; autoload -U +X $1 ) &> /dev/null
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}
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# Checks boolean variable for "true" (case insensitive "1", "y", "yes", "t", "true", "o", and "on").
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function is-true() {
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[[ -n "$1" && "$1" == (1|[Yy]([Ee][Ss]|)|[Tt]([Rr][Uu][Ee]|)|[Oo]([Nn]|)) ]]
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}
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# Prints the first non-empty string in the arguments array.
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function coalesce() {
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for arg in "$argv[@]"; do
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print "$arg"
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return 0
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done
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return 1
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}
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# Trap signals were generated with 'kill -l'.
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# DEBUG, EXIT, and ZERR are Zsh signals.
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TRAP_SIGNALS=(
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ABRT ALRM BUS CHLD CONT EMT FPE HUP ILL INFO INT IO KILL PIPE PROF QUIT
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SEGV STOP SYS TERM TRAP TSTP TTIN TTOU URG USR1 USR2 VTALRM WINCH XCPU XFSZ
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DEBUG EXIT ZERR
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)
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# Adds a function 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: $0 type function" >&2
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return 1
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fi
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if [[ -z "$TRAP_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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