Re-add some accidentally deleted docs.
These were accidentally deleted in
https://github.com/bazelbuild/bazel/commit/7dec00574aa91327693f6ba7e90bff5bc834253e.
RELNOTES: None
PiperOrigin-RevId: 158404948
diff --git a/site/docs/query.html b/site/docs/query.html
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--- a/site/docs/query.html
+++ b/site/docs/query.html
@@ -1235,6 +1235,64 @@
<code>@repo//foo/bar</code> while packages in the main repository are
formatted as <code>foo/bar</code>.
</p>
+<p>
+ In conjunction with the <code>deps(...)</code> query, this output
+ option can be used to find the set of packages that must be checked
+ out in order to build a given set of targets.
+</p>
+
+<h3 id="output-graph">Display a graph of the result</h3>
+<pre>--output graph</pre>
+<p>
+ This option causes the query result to be printed as a directed
+ graph in the popular AT&T GraphViz format. Typically the
+ result is saved to a file, such as <code>.png</code> or <code>.svg</code>.
+ (If the <code>dot</code> program is not installed on your workstation, you
+ can install it using the command <code>sudo apt-get install graphviz</code>.)
+ See the example section below for a sample invocation.
+</p>
+
+<p>
+ This output format is particularly useful for <code>allpath</code>,
+ <code>deps</code>, or <code>rdeps</code> queries, where the result
+ includes a <em>set of paths</em> that cannot be easily visualized when
+ rendered in a linear form, such as with <code>--output label</code>.
+</p>
+
+<p>
+ By default, the graph is rendered in a <em>factored</em> form. That is,
+ topologically-equivalent nodes are merged together into a single
+ node with multiple labels. This makes the graph more compact
+ and readable, because typical result graphs contain highly
+ repetitive patterns. For example, a <code>java_library</code> rule
+ may depend on hundreds of Java source files all generated by the
+ same <code>genrule</code>; in the factored graph, all these files
+ are represented by a single node. This behavior may be disabled
+ with the <code>--nograph:factored</code> option.
+</p>
+
+<h4><code>--graph:node_limit <var>n</var></code></h4>
+<p>
+ The option specifies the maximum length of the label string for a
+ graph node in the output. Longer labels will be truncated; -1
+ disables truncation. Due to the factored form in which graphs are
+ usually printed, the node labels may be very long. GraphViz cannot
+ handle labels exceeding 1024 characters, which is the default value
+ of this option. This option has no effect unless
+ <code>--output=graph</code> is being used.
+</p>
+
+<h4><code>--[no]graph:factored</code></h4>
+<p>
+ By default, graphs are displayed in factored form, as explained
+ <a href='#output-graph'>above</a>.
+ When <code>--nograph:factored</code> is specified, graphs are
+ printed without factoring. This makes visualization using GraphViz
+ impractical, but the simpler format may ease processing by other
+ tools (e.g. grep). This option has no effect
+ unless <code>--output=graph</code> is being used.
+</p>
+
<h3 id="output-xml">XML</h3>
<pre>--output xml</pre>
<p>
