[kwlug-disc] Sanity check of shell scripting approach

[Doug Moen]

I'd use jq for parsing JSON, so I'd probably write
    $ jq .appDomain <manifest.json
instead.

Although that doesn't do a 'trim', which probably requires doing a regex substitution in jq (which I haven't learned how to do).
Because I don't know that, I'd probably resort to a shell trick instead for the trim, like this:
  $ echo $(jq .appDomain <manifest.json)

Is that kind of shell trick insane? I dunno, whatever makes you productive and requires the least effort is good.

I recommend learning jq if you deal with JSON a lot, it seems easier than writing javascript code.

Doug.

On Tue, Apr 20, 2021, at 10:14 PM, Mikalai Birukou via kwlug-disc wrote:
> Sometimes, while in shell, I want to do manipulations that are simple in 
> node, and I have no idea how to do in shell. I find myself with 
> functions like:
> 
> app_domain_from_manifest() {
>      local manifest="$1"
>      node -e "
>          const m = fs.readFileSync('$manifest', { encoding: 'utf8' });
>          const appDomain = JSON.parse(m).appDomain.trim();
>          if (!appDomain) { throw new Error('appDomain field is not a 
> string'); }
>          console.log(appDomain);
>      " || exit $?
> }
> 
> Couple of lines passed to node -e.
> 
> Is it insane?
> 
> Do you do similar with python?
> 
> What's your milage?
> 
> 
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