how to optimize bash command with nested sub-command? - bash

Question

current code do work, is there any way to optimize it?
seems jq cmd cost lots of time to work result out of json struct.
which make autocomplete quite slow.
the code below try to define a nested shell command struct with json text, then use jq command to parse the json text, and parse autocomplete results.
function _auto_completion_linux_ext() {
COMPREPLY=()
local cmd="${COMP_WORDS[1]}"
local cur="${COMP_WORDS[COMP_CWORD]}"
local prev="${COMP_WORDS[COMP_CWORD-1]}"
local opts
# printf "\n[COMP_WORDS] -> ${COMP_WORDS}\n"
# printf "\n[COMP_CWORD] -> ${COMP_CWORD} -> ${cur}\n"
read -r -d '' var_basic_json << EOV
{
"init": {
"hostname": {}
},
"firewall": {
"enable": {},
"disable": {},
"reload": {},
"add": {
"tcp": {},
"udp": {}
},
"del": {
"tcp": {},
"udp": {}
},
"list": {}
},
"network": {
"ipv4": {
"dhcp": {},
"static": {}
},
"ipv6": {
"dhcp": {},
"static": {}
}
},
"status": {
"tcp": {},
"listening_port": {}
},
"upgrade": {}
}
EOV
case ${COMP_CWORD} in
1):
opts=$(echo ${var_basic_json} | jq -j ". | keys | join(\" \")")
;;
*):
local var_jq_idx=()
local var_jq_idx_str
for ((i = 1; i <= COMP_CWORD; i++)); do
var_jq_idx_str=$(echo ${var_jq_idx[#]} | tr " " ".")
if [[ $(echo ${var_basic_json} | jq -j ".${var_jq_idx} | has(\"${COMP_WORDS[i]}\")") ]]; then
var_jq_idx+=(${COMP_WORDS[i]})
else
break
fi
done
opts=$(echo ${var_basic_json} | jq -j ".${var_jq_idx_str} | keys | join(\" \")")
;;
esac
COMPREPLY=($(compgen -W "${opts}" -- ${cur}))
return 0;
}
complete -F _auto_completion_linux_ext system