import libxo-2.3.0

[phil]

Summary

I'm ready to import libxo-2.3.0 into freebsd and want review comments.

This diff is massive (220KLOD); you might have an easier time looking at the source on https://github.com/Juniper/libxo.git

Highlights in this delta include:

• llvm plugins:
  • "validate": validate libxo format strings during compilation, generating errors and warnings
  • "precompile": compile format strings into binary data, avoiding run-time parsing of format strings
• "--libxo filter=XXX" allows filtering of output using an xpath-like syntax
• "rtoon" is a variant of "toon, allowing a reduction in tokens when feeding data to LLMs
• support for FreeBSD's exterr infra in xo_err* functions

rtoon is an dynamically loader encoder; the filter module is also dynamically loader when needed

Test Plan

libxo contains an extensive test library. In addition, the libxo-enabled binaries are exersized by kyua.

[phil]

Docs are on libxo.readthedocs.io (latest)

Testing can be done using LD_LIBRARY_PATH=xxxx on a local build of the git repo.

Another feature: xo-logger(1) is compatible with logger(1) but support xo_syslog(3)-style format strings for generating ng-syslog messages

Thanks,
Phil

[phil]

Regenerate diffs without /tests/*, which turns out to be 75% of the size.

[phil]

Another feature worth pointing out: xohtml(1) runs a commnd using the HTML encoder and then wraps the HTML with enough CSS to make it look pretty and enough JS to make it useful (table views; sort by column, hovers showing field info, xpaths, types, etc)

Thanks,
Phil

[sjg]

Impressive ;-)
A few nits mostly around white-space and layout.
I skipped the bits I don't grok

filter/xo_xparse.c

157

Looks a bit ragged here, is it better in real life?
At least I see same number of TABs in most cases

libxo/xo_tolower.c

65

these comments would be more useful at the end of the relevant lines above

llvm-plugins/xocc.sh.in

209

indentation (in real diff) seems inconsistent. M-x untabify or M-x tabify would at least make it consistent