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chromium / external / gitster / git-htmldocs / cf7310088e7328f8aa7ea2c5de767ef9499b5d78 / . / technical / api-tree-walking.html
blob: 0f52ea0b79dc470139865b9fa53431baff90756d [file] [log] [blame]
Junio C Hamano944ce252018-05-30 22:25:26[diff] [blame]1<?xml version="1.0" encoding="UTF-8"?>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]6<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
Junio C Hamano944ce252018-05-30 22:25:26[diff] [blame]7<meta name="generator" content="AsciiDoc 8.6.10" />
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]8<title>tree walking API</title>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]9<style type="text/css">
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]10/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]25}
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Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]31a {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]38
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]178 border: 1px solid #dddddd;
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Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]278
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Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]359div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]419
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]450}
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]452
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]481}
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]483table.tableblock.frame-topbot {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]513}
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]515
516/*
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]734</head>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]735<body class="article">
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]736<div id="header">
737<h1>tree walking API</h1>
738</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]739<div id="content">
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]740<div id="preamble">
741<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]742<div class="paragraph"><p>The tree walking API is used to traverse and inspect trees.</p></div>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]743</div>
744</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]745<div class="sect1">
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]746<h2 id="_data_structures">Data Structures</h2>
747<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]748<div class="dlist"><dl>
749<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]750<code>struct name_entry</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]751</dt>
752<dd>
753<p>
754 An entry in a tree. Each entry has a sha1 identifier, pathname, and
755 mode.
756</p>
757</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]758<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]759<code>struct tree_desc</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]760</dt>
761<dd>
762<p>
763 A semi-opaque data structure used to maintain the current state of the
764 walk.
765</p>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]766<div class="ulist"><ul>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]767<li>
768<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]769<code>buffer</code> is a pointer into the memory representation of the tree. It always
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]770points at the current entry being visited.
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]771</p>
772</li>
773<li>
774<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]775<code>size</code> counts the number of bytes left in the <code>buffer</code>.
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]776</p>
777</li>
778<li>
779<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]780<code>entry</code> points to the current entry being visited.
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]781</p>
782</li>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]783</ul></div>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]784</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]785<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]786<code>struct traverse_info</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]787</dt>
788<dd>
789<p>
790 A structure used to maintain the state of a traversal.
791</p>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]792<div class="ulist"><ul>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]793<li>
794<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]795<code>prev</code> points to the traverse_info which was used to descend into the
796current tree. If this is the top-level tree <code>prev</code> will point to
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]797a dummy traverse_info.
798</p>
799</li>
800<li>
801<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]802<code>name</code> is the entry for the current tree (if the tree is a subtree).
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]803</p>
804</li>
805<li>
806<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]807<code>pathlen</code> is the length of the full path for the current tree.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]808</p>
809</li>
810<li>
811<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]812<code>conflicts</code> can be used by callbacks to maintain directory-file conflicts.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]813</p>
814</li>
815<li>
816<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]817<code>fn</code> is a callback called for each entry in the tree. See Traversing for more
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]818information.
819</p>
820</li>
821<li>
822<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]823<code>data</code> can be anything the <code>fn</code> callback would want to use.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]824</p>
825</li>
Junio C Hamano53ba6d02010-08-22 07:25:12[diff] [blame]826<li>
827<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]828<code>show_all_errors</code> tells whether to stop at the first error or not.
Junio C Hamano53ba6d02010-08-22 07:25:12[diff] [blame]829</p>
830</li>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]831</ul></div>
832</dd>
833</dl></div>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]834</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]835</div>
836<div class="sect1">
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]837<h2 id="_initializing">Initializing</h2>
838<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]839<div class="dlist"><dl>
840<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]841<code>init_tree_desc</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]842</dt>
843<dd>
844<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]845 Initialize a <code>tree_desc</code> and decode its first entry. The buffer and
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]846 size parameters are assumed to be the same as the buffer and size
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]847 members of <code>struct tree</code>.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]848</p>
849</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]850<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]851<code>fill_tree_descriptor</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]852</dt>
853<dd>
854<p>
Junio C Hamano7526f0a2017-08-24 18:09:35[diff] [blame]855 Initialize a <code>tree_desc</code> and decode its first entry given the
856 object ID of a tree. Returns the <code>buffer</code> member if the latter
857 is a valid tree identifier and NULL otherwise.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]858</p>
859</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]860<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]861<code>setup_traverse_info</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]862</dt>
863<dd>
864<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]865 Initialize a <code>traverse_info</code> given the pathname of the tree to start
866 traversing from. The <code>base</code> argument is assumed to be the <code>path</code>
867 member of the <code>name_entry</code> being recursed into unless the tree is a
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]868 top-level tree in which case the empty string ("") is used.
869</p>
870</dd>
871</dl></div>
872</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]873</div>
874<div class="sect1">
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]875<h2 id="_walking">Walking</h2>
876<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]877<div class="dlist"><dl>
878<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]879<code>tree_entry</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]880</dt>
881<dd>
882<p>
883 Visit the next entry in a tree. Returns 1 when there are more entries
884 left to visit and 0 when all entries have been visited. This is
885 commonly used in the test of a while loop.
886</p>
887</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]888<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]889<code>tree_entry_len</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]890</dt>
891<dd>
892<p>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]893 Calculate the length of a tree entry&#8217;s pathname. This utilizes the
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]894 memory structure of a tree entry to avoid the overhead of using a
895 generic strlen().
896</p>
897</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]898<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]899<code>update_tree_entry</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]900</dt>
901<dd>
902<p>
903 Walk to the next entry in a tree. This is commonly used in conjunction
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]904 with <code>tree_entry_extract</code> to inspect the current entry.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]905</p>
906</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]907<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]908<code>tree_entry_extract</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]909</dt>
910<dd>
911<p>
912 Decode the entry currently being visited (the one pointed to by
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]913 <code>tree_desc's</code> <code>entry</code> member) and return the sha1 of the entry. The
914 <code>pathp</code> and <code>modep</code> arguments are set to the entry&#8217;s pathname and mode
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]915 respectively.
916</p>
917</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]918<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]919<code>get_tree_entry</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]920</dt>
921<dd>
922<p>
923 Find an entry in a tree given a pathname and the sha1 of a tree to
924 search. Returns 0 if the entry is found and -1 otherwise. The third
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]925 and fourth parameters are set to the entry&#8217;s sha1 and mode
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]926 respectively.
927</p>
928</dd>
929</dl></div>
930</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]931</div>
932<div class="sect1">
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]933<h2 id="_traversing">Traversing</h2>
934<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]935<div class="dlist"><dl>
936<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]937<code>traverse_trees</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]938</dt>
939<dd>
940<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]941 Traverse <code>n</code> number of trees in parallel. The <code>fn</code> callback member of
942 <code>traverse_info</code> is called once for each tree entry.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]943</p>
944</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]945<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]946<code>traverse_callback_t</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]947</dt>
948<dd>
949<p>
950 The arguments passed to the traverse callback are as follows:
951</p>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]952<div class="ulist"><ul>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]953<li>
954<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]955<code>n</code> counts the number of trees being traversed.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]956</p>
957</li>
958<li>
959<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]960<code>mask</code> has its nth bit set if something exists in the nth entry.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]961</p>
962</li>
963<li>
964<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]965<code>dirmask</code> has its nth bit set if the nth tree&#8217;s entry is a directory.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]966</p>
967</li>
968<li>
969<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]970<code>entry</code> is an array of size <code>n</code> where the nth entry is from the nth tree.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]971</p>
972</li>
973<li>
974<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]975<code>info</code> maintains the state of the traversal.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]976</p>
977</li>
978</ul></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]979<div class="paragraph"><p>Returning a negative value will terminate the traversal. Otherwise the
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]980return value is treated as an update mask. If the nth bit is set the nth tree
981will be updated and if the bit is not set the nth tree entry will be the
982same in the next callback invocation.</p></div>
983</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]984<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]985<code>make_traverse_path</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]986</dt>
987<dd>
988<p>
989 Generate the full pathname of a tree entry based from the root of the
990 traversal. For example, if the traversal has recursed into another
991 tree named "bar" the pathname of an entry "baz" in the "bar"
992 tree would be "bar/baz".
993</p>
994</dd>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]995<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]996<code>traverse_path_len</code>
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]997</dt>
998<dd>
999<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1000 Calculate the length of a pathname returned by <code>make_traverse_path</code>.
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]1001 This utilizes the memory structure of a tree entry to avoid the
1002 overhead of using a generic strlen().
1003</p>
1004</dd>
1005</dl></div>
1006</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]1007</div>
1008<div class="sect1">
Junio C Hamanofd9274d2009-08-05 21:21:39[diff] [blame]1009<h2 id="_authors">Authors</h2>
1010<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]1011<div class="paragraph"><p>Written by Junio C Hamano &lt;<a href="mailto:gitster@pobox.com">gitster@pobox.com</a>&gt; and Linus Torvalds
1012&lt;<a href="mailto:torvalds@linux-foundation.org">torvalds@linux-foundation.org</a>&gt;</p></div>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]1013</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]1014</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]1015</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]1016<div id="footnotes"><hr /></div>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]1017<div id="footer">
1018<div id="footer-text">
Junio C Hamano2ef0ba32018-01-26 23:13:53[diff] [blame]1019Last updated
Junio C Hamanocf731002019-01-29 21:19:52[diff] [blame^]1020 2018-01-26 15:11:04 PST
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]1021</div>
1022</div>
1023</body>
1024</html>