Allow passing the inline jq script after --

[emanuele6]

jq previously only allowed passing the inline script before -- (as if they were options) even though one would expect the inline script to be a positional argument.

Since jq previously also refused to run with a usage error if the script was passed after -- (It was not assuming . as script as it does when no arguments are passed), and positional arguments are allowed before -- and even before other options, it should not be a breaking change to change that weird behaviour, and allow the script to appear after --.

It also simplifies the option parsing code a bunch.

Fixes #2918

[emanuele6]

I could add a test for this in shtest.done
Is there some documentation that I should change that I missing?

[emanuele6]

Editing this code made me realise that --args and --jsonargs are not mutually exclusive; you can pass file inputs even if you use one of those options, and you can even pass file inputs, string arguments, json arguments at the same time to jq as long as they don't look like options:

jq '$ARGS.positional + [ .foo ]' file1 file2 --args str1 str2 --jsonargs '"json1"' '"json2"' '"json3"' --args str3

I never realised that, that's funny. =)

[nicowilliams]

Thanks!

[emanuele6]

Oops, I should have said "after", not "before" in the title.