[OpenWrt-Devel] Jsonfilter, return partial subobject?

[Michael Jones]

On Thu, Apr 23, 2020 at 12:55 PM Michael Jones <mike at meshplusplus.com>
wrote:

> I'm quite reluctant to do multiple processing sweeps. E.g. the following
> (probably syntax-error-full, and erroneous output) shell script is
> extremely unattractive
>
> json=`ubus call network.interface dump | jsonfilter -e '@.interface'`
> echo '['
> for itf in $(echo $json | jsonfilter -e '@[@.up=true].interface')
> do
>     echo "{ \"interface\" : \"$itf\" , \"uptime\" : $(echo $json |
> jsonfilter -e "@[@.interface=$itf].uptime") }," # Oh look, an unconditional
> trailing comma... that won't parse until JSON5...
> done
> echo ']'
>
>
I suppose I should follow my original email up with an acknowledgement of
the jshn.sh library (and jshn program).

So I know that the script could be improved to work (and work correctly)
like this:

. /usr/share/libubox/jshn.sh
json_init
json_add_array arr

jsonoutput=`ubus call network.interface dump | jsonfilter -e '@.interface'`

for itf in $(echo $jsonoutput | jsonfilter -e '@[@.up=true].interface')
do
    json_add_object
    json_add_string interface $itf
    json_add_int    uptime    $(echo $jsonoutput | jsonfilter -e
"@[@.interface='$itf'].uptime")
    json_close_object
done

json_close_array
json_dump | jsonfilter -e '@.arr'


But I didn't want to muddle the question of "can I do what I want with
jsonfilter by itself", because I don't want to involve the use of a shell
script at all if I can avoid it!
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