Support --raw-output0

[pkoppstein]

The 1.0 beta announcement mentions support for the --nul-output command-line option.

Please note that jq 1.7rc1 has removed that option, and mentions instead:

      --raw-output0         implies -r and output NUL after each output;

It is generally expected that jq 1.7 will be released quite soon, and that the above remarks about jq 1.7rc1 will apply to 1.7 as well.

[baodrate]

Thanks for the heads up. This was introduced in jqlang/jq#2684. Worth noting that --raw-output0 bails when any outputs contain a NUL:

https://github.com/jqlang/jq/blob/a6920601299913ec5f9c9a8883517ec10dd71ffe/docs/content/manual/manual.yml#L150-L154

On top of renaming --nul-output to --raw-output0, we should add that check to remain consistent with jq.

note that the behavior of -j/--join-output was already inconsistent with jq (in jaq it does not imply -r). I matched that in --nul-output for internal consistency.

[01mf02]

For now, I have reverted your previous PR, @baod-rate, because of the change in jq.
I think that it would be great to have some option to set the "output terminator string"; let's call it --output-sep for the sake of discussion.
Then the default would be --output-sep "\n", --join would be equivalent to --output-sep "", and the --raw-output0 option would imply --output-sep "\0". On Windows, --output-sep "\r\n" could be useful.
Prohibiting certain characters in the output as foreseen by --raw-output0 seems difficult, though.