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#autoload
## Recommended usage:
# {
# _shadow fname
# function fname {
# # Do your new thing
# }
# # Invoke callers of fname
# } always {
# _unshadow fname
# }
## Alternate usage:
# {
# _shadow -s suffix fname
# function fname {
# # Do other stuff
# fname@suffix new args for fname
# }
# # Invoke callers of fname
# } always {
# _unshadow -s suffix fname
# }
##
# BUGS:
# * `functions -c` acts like `autoload +X`
# * name collisions are possible in alternate usage
# * functions that examine $0 probably misfire
zmodload zsh/parameter # Or what?
# This probably never comes up, but protect ourself from recursive call
# chains that may duplicate the top elements of $funcstack by creating
# a counter of _shadow calls and using it to make shadow names unique.
typeset -gHi _shadowdepth=0
# Create a copy of each fname so that a caller may redefine
_shadow() {
local -A fsfx=( -s ${funcstack[2]}:${functrace[2]}:$((_shadowdepth+1)) )
local fname
zparseopts -K -A fsfx -D s:
for fname; do
local shadowname=${fname}@${fsfx[-s]}
(( ${+functions[$fname]} )) &&
builtin functions -c $fname $shadowname
done
((_shadowdepth++))
}
# Remove the redefined function and shadowing name
_unshadow() {
local -A fsfx=( -s ${funcstack[2]}:${functrace[2]}:${_shadowdepth} )
local fname
zparseopts -K -A fsfx -D s:
for fname; do
local shadowname=${fname}@${fsfx[-s]}
if (( ${+functions[$shadowname]} )); then
builtin functions -c $shadowname $fname
builtin unfunction $shadowname
elif (( ${+functions[$fname]} )); then
builtin unfunction $fname
fi
done
((_shadowdepth--))
}
# This is tricky. When we call _shadow recursively from autoload,
# there's an extra level of stack in $functrace that will confuse
# the later call to _unshadow. Fool ourself into working correctly.
(( ARGC )) && _shadow -s ${funcstack[2]}:${functrace[2]}:1 "$@"
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