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# This function is the common guts of the gen-applied-string /
# gen-unapplied-string / set-patch-format dance of several backends.
#
# Parameters:
# $1 - name of an array parameter to be the argument to gen-applied-string
# $2 - name of a parameter to store the applied-string in
# $3 - name of an array parameter to be the argument to gen-unapplied-string
# $4 - name of a parameter to store the unapplied-string in
{
local REPLY
if VCS_INFO_hook 'gen-applied-string' "${(@P)1}"; then
if (( ${(P)#1} )); then
REPLY=${(P)1[1]}
else
REPLY=""
fi
else
REPLY=${hook_com[applied-string]}
fi
: ${(P)2::=$REPLY}
hook_com=()
if VCS_INFO_hook 'gen-unapplied-string' "${(@P)3}"; then
REPLY=${(P)#3}
else
REPLY=${hook_com[unapplied-string]}
fi
: ${(P)4::=$REPLY}
hook_com=()
}
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