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#autoload
# Usage:
# _combination [-s S] TAG STYLE \
# Ki1[:Ni1]=Pi1 Ki2[:Ni2]=Pi2 ... Kim[:Nim]=Pim Kj[:Nj] EXPL...
#
# STYLE should be of the form K1-K2-...-Kn.
#
# Example: telnet
#
# Assume an user sets the style `hosts-ports-users' as for the my-accounts
# tag:
#
# zstyle ':completion:*:*:telnet:*:my-accounts' hosts-ports-users \
# host0:: host1::user1 host2::user2
# mail-server:{smtp,pop3}:
# news-server:nntp:
# proxy-server:8000:
#
#
# `_telnet' completes hosts as:
#
# _combination my-accounts hosts-ports-users \
# ${opt_args[-l]:+users=${opt_args[-l]:q}} \
# hosts "$expl[@]"
#
# This completes `host1', `host2', `mail-server', `news-server' and
# `proxy-server' according to the user given with `-l' if it is exists.
# And if it is failed, `_hosts' is called.
#
# `_telnet' completes ports as:
#
# _combination my-accounts hosts-ports-users \
# ${opt_args[-l]:+users=${opt_args[-l]:q}} \
# hosts="${line[2]:q}" \
# ports "$expl[@]"
#
# This completes `smtp', `pop3', `nntp' and `8000' according to the
# host argument --- $line[2] and the user option argument if it is
# exists. And if it is failed, `_ports' is called.
#
# `_telnet' completes users for an argument of option `-l' as:
#
# _combination my-accounts hosts-ports-users \
# ${line[2]:+hosts="${line[2]:q}"} \
# ${line[3]:+ports="${line[3]:q}"} \
# users "$expl[@]"
#
# This completes `user1' and `user2' according to the host argument and
# the port argument if they are exist. And if it is failed, `_users' is
# called.
local sep tag style keys pats key num tmp
if [[ "$1" = -s ]]; then
sep="$2"
shift 2
else
sep=:
fi
tag="$1"
style="$2"
shift 2
keys=( ${(s/-/)style} )
pats=( "${(@)keys/*/*}" )
while [[ "$1" = *=* ]]; do
tmp="${1%%\=*}"
key="${tmp%:*}"
num="${${tmp##*:}:-1}"
pats[$keys[(in:num:)$key]]="${1#*\=}"
shift
done
key="${1%:*}"
num="${${1##*:}:-1}"
shift
if zstyle -a ":completion:${curcontext}:$tag" "$style" tmp; then
eval "tmp=( \"\${(@M)tmp:#\${(j($sep))~pats}}\" )"
if (( keys[(in:num:)$key] != 1 )); then
eval "tmp=( \${tmp#\${(j(${sep}))~\${(@)\${(@)keys[2,(rn:num:)\$key]}/*/*}}$sep} )"
fi
tmp=( ${tmp%%$sep*} )
compadd "$@" - $tmp || { (( $+functions[_$key] )) && "_$key" "$@" }
else
(( $+functions[_$key] )) && "_$key" "$@"
fi
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