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.. index:: --libxo, xo
The "xo" Utility
================
The `xo` utility allows command line access to the functionality of
the libxo library. Using `xo`, shell scripts can emit XML, JSON, and
HTML using the same commands that emit text output.
The style of output can be selected using a specific option: "-X" for
XML, "-J" for JSON, "-H" for HTML, or "-T" for TEXT, which is the
default. The "--style <style>" option can also be used. The standard
set of "--libxo" options are available (see :ref:`options`), as well
as the `LIBXO_OPTIONS`_ environment variable.
.. _`LIBXO_OPTIONS`: :ref:`libxo-options`
The `xo` utility accepts a format string suitable for `xo_emit` and
a set of zero or more arguments used to supply data for that string::
xo "The {k:name} weighs {:weight/%d} pounds.\n" fish 6
TEXT:
The fish weighs 6 pounds.
XML:
<name>fish</name>
<weight>6</weight>
JSON:
"name": "fish",
"weight": 6
HTML:
<div class="line">
<div class="text">The </div>
<div class="data" data-tag="name">fish</div>
<div class="text"> weighs </div>
<div class="data" data-tag="weight">6</div>
<div class="text"> pounds.</div>
</div>
The `--wrap $path` option can be used to wrap emitted content in a
specific hierarchy. The path is a set of hierarchical names separated
by the '/' character::
xo --wrap top/a/b/c '{:tag}' value
XML:
<top>
<a>
<b>
<c>
<tag>value</tag>
</c>
</b>
</a>
</top>
JSON:
"top": {
"a": {
"b": {
"c": {
"tag": "value"
}
}
}
}
The `--open $path` and `--close $path` can be used to emit
hierarchical information without the matching close and open
tag. This allows a shell script to emit open tags, data, and
then close tags. The `--depth` option may be used to set the
depth for indentation. The `--leading-xpath` may be used to
prepend data to the XPath values used for HTML output style::
EXAMPLE;
#!/bin/sh
xo --open top/data
xo --depth 2 '{tag}' value
xo --close top/data
XML:
<top>
<data>
<tag>value</tag>
</data>
</top>
JSON:
"top": {
"data": {
"tag": "value"
}
}
Command Line Options
--------------------
::
Usage: xo [options] format [fields]
--close <path> Close tags for the given path
--depth <num> Set the depth for pretty printing
--help Display this help text
--html OR -H Generate HTML output
--json OR -J Generate JSON output
--leading-xpath <path> Add a prefix to generated XPaths (HTML)
--open <path> Open tags for the given path
--pretty OR -p Make 'pretty' output (add indent, newlines)
--style <style> Generate given style (xml, json, text, html)
--text OR -T Generate text output (the default style)
--version Display version information
--warn OR -W Display warnings in text on stderr
--warn-xml Display warnings in xml on stdout
--wrap <path> Wrap output in a set of containers
--xml OR -X Generate XML output
--xpath Add XPath data to HTML output);
Example
-------
::
% xo 'The {:product} is {:status}\n' stereo "in route"
The stereo is in route
% ./xo/xo -p -X 'The {:product} is {:status}\n' stereo "in route"
<product>stereo</product>
<status>in route</status>
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