Zstd: Add information about supported formats to cli's output

[ib]

This allows parsing the information if necessary and is informative to the user as well.

[Cyan4973]

That's a good point @ib,
though, to be complete, we would probably have to mention
when cli supports .gz and .xz formats too

[ib]

though, to be complete, we would probably have to mention
when cli supports .gz and .xz formats too

This can already easily be parsed and seen from the cli's help output (--format=), but a new and compact Supports: line would be okay as well.

[ib]

Something like this:

*** zstd command line interface 32-bits v1.3.0, by Yann Collet
    supporting zstd formats v0.4+, gzip, lzma, xz ***

or this:

*** zstd command line interface 32-bits v1.3.0, by Yann Collet
*** supporting zstd formats v0.4+, gzip, lzma, xz

[Cyan4973]

Yes, something like the 2nd example looks great

[ib]

Here you are.

[Cyan4973]

Thanks @ib, it's pretty good,
though note that ZSTD_LEGACY_SUPPORT==0 means "no legacy support"

[ib]

Oops, missed the header (which btw had no range check so far).

[ib]

On top of that some beautification.

[ib]

@Cyan4973, are you going to apply this?

[Cyan4973]

yes, it's in the list

[Cyan4973]

The proposed patch makes zstdcli.c dependant on zstd_legacy.h.
However, it should be possible to compile zstdcli.c without legacy support, hence without availability of zstd_legacy.h.

Let's find another way...

[Cyan4973]

In your patch, you propose this information to be displayed under usage_advanced(), which is triggered by -h command. In which case, it also displays additional instructions.

I was considering to trigger it under "verbose Version", which would be triggered by -vV. It would basically limit the output to the 2 lines mentioned.
What do you think ?

[ib]

-vV sounds good to me.

[ib]

This should do the job.

[Cyan4973]

Thanks @ib .

806 implements the requested feature, based on your suggested patch.

Branch displayVersion can be used to test it.