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<title>[30091] trunk/src: Introduce some actions and filters which aid plugins in revisioning post meta.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/30091">30091</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/30091","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>johnbillion</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2014-10-29 19:01:15 +0000 (Wed, 29 Oct 2014)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Introduce some actions and filters which aid plugins in revisioning post meta.
* `wp_save_post_revision_post_has_changed` filter which can be used to determine if a post has been changed, and therefore if a revision should be created for a post.
* `wp_get_revision_ui_diff` filter which can be used to filter the fields displayed in the post revision diff UI.
* `wp_creating_autosave` action which is fired just before an autosave is created.
See <a href="https://core.trac.wordpress.org/ticket/20564">#20564</a>.
Props mattheu, adamsilverstein.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludespostphp">trunk/src/wp-admin/includes/post.php</a></li>
<li><a href="#trunksrcwpadminincludesrevisionphp">trunk/src/wp-admin/includes/revision.php</a></li>
<li><a href="#trunksrcwpincludesrevisionphp">trunk/src/wp-includes/revision.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpadminincludespostphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/post.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/post.php 2014-10-29 18:36:41 UTC (rev 30090)
+++ trunk/src/wp-admin/includes/post.php 2014-10-29 19:01:15 UTC (rev 30091)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1541,6 +1541,15 @@
</span><span class="cx" style="display: block; padding: 0 10px"> return 0;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * Fires before an autosave is stored.
+ *
+ * @since 4.1.0
+ *
+ * @param array $new_autosave Post array - the autosave that is about to be saved.
+ */
+ do_action( 'wp_creating_autosave', $new_autosave );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> return wp_update_post( $new_autosave );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre></div>
<a id="trunksrcwpadminincludesrevisionphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/revision.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/revision.php 2014-10-29 18:36:41 UTC (rev 30090)
+++ trunk/src/wp-admin/includes/revision.php 2014-10-29 19:01:15 UTC (rev 30091)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -92,7 +92,18 @@
</span><span class="cx" style="display: block; padding: 0 10px"> );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return $return;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ /**
+ * Filter the fields displayed in the post revision diff UI.
+ *
+ * @since 4.1.0
+ *
+ * @param array $return Revision UI fields. Each item is an array of id, name and diff.
+ * @param WP_Post $compare_from The revision post to compare from.
+ * @param WP_Post $compare_to The revision post to compare to.
+ */
+ return apply_filters( 'wp_get_revision_ui_diff', $return, $compare_from, $compare_to );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span></span></pre></div>
<a id="trunksrcwpincludesrevisionphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/revision.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/revision.php 2014-10-29 18:36:41 UTC (rev 30090)
+++ trunk/src/wp-includes/revision.php 2014-10-29 19:01:15 UTC (rev 30091)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -133,9 +133,26 @@
</span><span class="cx" style="display: block; padding: 0 10px"> break;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ /**
+ * Filter whether a post has changed.
+ *
+ * By default a revision is saved only if one of the revisioned fields has changed.
+ * This filter allows for additional checks to determine if there were changes.
+ *
+ * @since 4.1.0
+ *
+ * @param bool $post_has_changed Whether the post has changed.
+ * @param WP_Post $last_revision The the last revision post object.
+ * @param WP_Post $post The post object.
+ *
+ */
+ $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> //don't save revision if post unchanged
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if( ! $post_has_changed )
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if( ! $post_has_changed ) {
</ins><span class="cx" style="display: block; padding: 0 10px"> return;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre>
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