added ssh config for host completion

.zsh/lib/completion.zsh

@@ -36,10 +36,12 @@ cdpath=(.)
 [ -r /etc/ssh/ssh_known_hosts ] && _global_ssh_hosts=(${${${${(f)"$(</etc/ssh/ssh_known_hosts)"}:#[\|]*}%%\ *}%%,*}) || _ssh_hosts=()
 [ -r ~/.ssh/known_hosts ] && _ssh_hosts=(${${${${(f)"$(<$HOME/.ssh/known_hosts)"}:#[\|]*}%%\ *}%%,*}) || _ssh_hosts=()
 [ -r /etc/hosts ] && : ${(A)_etc_hosts:=${(s: :)${(ps:\t:)${${(f)~~"$(</etc/hosts)"}%%\#*}##[:blank:]#[^[:blank:]]#}}} || _etc_hosts=()
+[ -r ~/.ssh/config ] && _ssh_config=($(cat ~/.ssh/config | sed -ne 's/Host[=\t ]//p')) || _ssh_config=()
 hosts=(
   "$_global_ssh_hosts[@]"
   "$_ssh_hosts[@]"
   "$_etc_hosts[@]"
+  "$_ssh_config[@]"
   "$HOST"
   localhost
 )