# disable sort when completing options of any command
zstyle ':completion:complete:*:options' sort false

# use input as query string when completing zlua
zstyle ':fzf-tab:complete:_zlua:*' query-string input

# (experimental, may change in the future)
# some boilerplate code to define the variable `extract` which will be used later
# please remember to copy them
local extract="
# trim input(what you select)
local in=\${\${\"\$(<{f})\"%\$'\0'*}#*\$'\0'}
# get ctxt for current completion(some thing before or after the current word)
local -A ctxt=(\"\${(@ps:\2:)CTXT}\")
# real path
local realpath=\${ctxt[IPREFIX]}\${ctxt[hpre]}\$in
realpath=\${(Qe)~realpath}
"

# give a preview of commandline arguments when completing `kill`
zstyle ':completion:*:*:*:*:processes' command "ps -u $USER -o pid,user,comm,cmd -w -w"
zstyle ':fzf-tab:complete:kill:argument-rest' extra-opts --preview=$extract'ps --pid=$in[(w)1] -o cmd --no-headers -w -w' --preview-window=down:3:wrap

# give a preview of directory by exa when completing cd
zstyle ':fzf-tab:complete:cd:*' extra-opts --preview=$extract'exa -1 --color=always $realpath'