MFC r334068 (phil):
Import libxo-0.9.0:
- Add xo_format_is_numeric() with improved logic to decide if format
strings are numeric, so json output quotes them
- Convert docs to sphinx/rst
- update tests

PR: 221676
Approved by: re (marius)
Sponsored by: The FreeBSD Foundation

Import libxo-0.8.4 from HEAD into stable/11

Submitted by: phil

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Submitted by: phil
Reviewed by: sjg (mentor)
Approved by: sjg

Import to 0.6.1
0.5.0:
document "trim" modifier
add xo_emit_field functions
Add xo_set_file{,_h} functions
Fix LIBXO_* variables; add -L and -I as needed
add --disable-silent-rules and an explicit make; s/PACKAGE-NAME/PACKAGE_NAME/; add /download/ to 'url'
fix silliness where xo_flush_h emitted closing tag (html); make the caller (xo_message) do it
flush after transitions; fix flush call in xo_do_emit
mkdir the version-specific packaging dir
use "XO_" instead of LIBXO_

0.6.0:
Add --with-retain-size to set the size (in bits) of the retain hash buckets
Add The Argument Modifier ({a:})
Add retain and no-retain to --libxo
autoconf: Add test for monitor.h
Document quote heuristic
go deep with nroff backslashes
Use "ULL" for 32 bit check
add xo_retain_clear and xo_retain_clear_all
docs: combine two 'handles' section; move command line argument section
handle GETTEXT when msgfmt isn't where it's supposed to be (FreeBSD)
make 'retain' a flag (XOEF_RETAIN) instead of a role; it's simpler, and doesn't feel as tacky. "{R:}" was painful to document, which means it's painful to use.
new xo_emit_f functions
nuke some unused UNUSEDs
test code: path must be static
update test cases

0.6.1:
fix version number (missed a commit during new-release)

Reviewed by: sjg
Approved by: sjg (mentor)

import libxo-0.4.7
Fix bug w/ {e:} in html, where no default encoding format was built
docs: "t" == "trim" (typo) (cf svn commit: r290445 - head/contrib/libxo/libxo)

Reviewed by: sjg
Approved by: sjg (mentor)

Merge libxo 0.4.6

Reviewed by: sjg
Approved by: sjg (mentor)

Upgrade libxo to 0.4.5.

Local changes incorporated by 0.4.5: r284340
Local changes retained: r276260, r282117

Obtained from: https://github.com/Juniper/libxo

Unbreak libxo's handling of characters not representable in current locale

The xo_format_string_direct function loops forever never advancing the
processed string pointer when it encounters a character that makes
mbrtowc fail. Make it emit '?' character instead, as it seems this is
what the code intent was, sans bugs.

Differential Revision: https://reviews.freebsd.org/D2802
Reviewed by: marcel

Fix build breakage with GCC.

Pointed out by: bz@

Upgrade libxo to 0.3.2.

Obtained from: https://github.com/Juniper/libxo/tree/0.3.2
Requested by: Phil Shafer <phil@juniper.net>

This import incorporates local change 279966.
Local change 276260 has been merged-in.

Upgrade libxo to 0.2.0.

Obtained from: https://github.com/Juniper/libxo
Requested by: Phil Shafer <phil@juniper.net>

Revisions 276253 & 276273 were incorporated into 0.2.0.
Revision 276260 has been merged-in.

Output strerror from xo_warn

Reported by: bapt
Reviewed by: bapt, ngie

Differential Revision: https://reviews.freebsd.org/D1378

Upgrade libxo to 0.1.6.

Summary of changes:
1. Coverity defect fixes

Obtained from: https://github.com/Juniper/libxo/releases/tag/0.1.6

Upgrade libxo to 0.1.5

Obtained from: https://github.com/Juniper/libxo

Import libxo 0.1.4

Obtained from: https://github.com/Juniper/libxo
Sponsored by: Juniper Networks, Inc.