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# Define a mathematical function with its definition and smart(ish)
# guessing of the number of arguments. Doesn't overload for different
# numbers of arguments, but that could be done. Type overloading would be
# more fraught.
emulate -L zsh
setopt extendedglob
if (( $# < 1 || $# > 2 )); then
print "Usage: $0 name [body]" >&2
return 1
fi
local mname=$1
local fname="zsh_math_func_$1"
if (( $# == 1 )); then
functions +M $mname && unfunction $fname
return 0
fi
integer iarg=0 ioptarg
local body=$2
# count compulsory arguments
while [[ $body = *'$'(\{|)$((iarg+1))(|[^:[:digit:]]*) ]]; do
(( iarg++ ))
done
# count optional arguments
(( ioptarg = iarg ))
while [[ $body = *'${'$((ioptarg+1))':-'* ]]; do
(( ioptarg++ ))
done
functions -M $mname $iarg $ioptarg $fname || return 1
# See if we need to autoload a math function from the standard
# library.
if ! zmodload -e zsh/mathfunc; then
local -a mathfuncs match mbegin mend loads
local mathfuncpat bodysearch
# generate pattern to match all known math functions
mathfuncs=(abs acos acosh asin asinh atan atanh cbrt ceil cos cosh erf erfc
exp expm1 fabs float floor gamma int j0 j1 lgamma log log10 log1p logb
sin sinh sqrt tan tanh y0 y1 signgam copysign fmod hypot nextafter jn yn
ldexp scalb rand48)
mathfuncpat="(${(j.|.)mathfuncs})"
bodysearch=$body
while [[ $bodysearch = (#b)(*[^[:alnum]]|)([[:alnum:]]##)\((*) ]]; do
# save worrying about search order...
bodysearch=$match[1]$match[3]
if [[ $match[2] = ${~mathfuncpat} ]]; then
# Uses function from math library.
loads+=($match[2])
fi
done
if (( ${#loads} )); then
zmodload -af zsh/mathfunc $loads
fi
fi
{
eval "$fname() { (( $body )) }"
} always {
# Remove math function if shell function definition failed.
if (( TRY_BLOCK_ERROR )); then
functions +M $mname
fi
}
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