700 lines
38 KiB
HTML
700 lines
38 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 1.5.8">
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<title>diff API</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
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/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
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@media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}}
|
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</style>
|
|
</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>diff API</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The diff API is for programs that compare two sets of files (e.g. two
|
|
trees, one tree and the index) and present the found difference in
|
|
various ways. The calling program is responsible for feeding the API
|
|
pairs of files, one from the "old" set and the corresponding one from
|
|
"new" set, that are different. The library called through this API is
|
|
called diffcore, and is responsible for two things.</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>finding total rewrites (<code>-B</code>), renames (<code>-M</code>) and copies (<code>-C</code>), and
|
|
changes that touch a string (<code>-S</code>), as specified by the caller.</p>
|
|
</li>
|
|
<li>
|
|
<p>outputting the differences in various formats, as specified by the
|
|
caller.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_calling_sequence">Calling sequence</h2>
|
|
<div class="sectionbody">
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>Prepare <code>struct diff_options</code> to record the set of diff options, and
|
|
then call <code>repo_diff_setup()</code> to initialize this structure. This
|
|
sets up the vanilla default.</p>
|
|
</li>
|
|
<li>
|
|
<p>Fill in the options structure to specify desired output format, rename
|
|
detection, etc. <code>diff_opt_parse()</code> can be used to parse options given
|
|
from the command line in a way consistent with existing git-diff
|
|
family of programs.</p>
|
|
</li>
|
|
<li>
|
|
<p>Call <code>diff_setup_done()</code>; this inspects the options set up so far for
|
|
internal consistency and make necessary tweaking to it (e.g. if
|
|
textual patch output was asked, recursive behaviour is turned on);
|
|
the callback set_default in diff_options can be used to tweak this more.</p>
|
|
</li>
|
|
<li>
|
|
<p>As you find different pairs of files, call <code>diff_change()</code> to feed
|
|
modified files, <code>diff_addremove()</code> to feed created or deleted files,
|
|
or <code>diff_unmerge()</code> to feed a file whose state is <em>unmerged</em> to the
|
|
API. These are thin wrappers to a lower-level <code>diff_queue()</code> function
|
|
that is flexible enough to record any of these kinds of changes.</p>
|
|
</li>
|
|
<li>
|
|
<p>Once you finish feeding the pairs of files, call <code>diffcore_std()</code>.
|
|
This will tell the diffcore library to go ahead and do its work.</p>
|
|
</li>
|
|
<li>
|
|
<p>Calling <code>diff_flush()</code> will produce the output.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_data_structures">Data structures</h2>
|
|
<div class="sectionbody">
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>struct diff_filespec</code></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This is the internal representation for a single file (blob). It
|
|
records the blob object name (if known — for a work tree file it
|
|
typically is a NUL SHA-1), filemode and pathname. This is what the
|
|
<code>diff_addremove()</code>, <code>diff_change()</code> and <code>diff_unmerge()</code> synthesize and
|
|
feed <code>diff_queue()</code> function with.</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>struct diff_filepair</code></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This records a pair of <code>struct diff_filespec</code>; the filespec for a file
|
|
in the "old" set (i.e. preimage) is called <code>one</code>, and the filespec for a
|
|
file in the "new" set (i.e. postimage) is called <code>two</code>. A change that
|
|
represents file creation has NULL in <code>one</code>, and file deletion has NULL
|
|
in <code>two</code>.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>A <code>filepair</code> starts pointing at <code>one</code> and <code>two</code> that are from the same
|
|
filename, but <code>diffcore_std()</code> can break pairs and match component
|
|
filespecs with other filespecs from a different filepair to form new
|
|
filepair. This is called <em>rename detection</em>.</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>struct diff_queue</code></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This is a collection of filepairs. Notable members are:</p>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>queue</code></dt>
|
|
<dd>
|
|
<p>An array of pointers to <code>struct diff_filepair</code>. This
|
|
dynamically grows as you add filepairs;</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>alloc</code></dt>
|
|
<dd>
|
|
<p>The allocated size of the <code>queue</code> array;</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>nr</code></dt>
|
|
<dd>
|
|
<p>The number of elements in the <code>queue</code> array.</p>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>struct diff_options</code></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This describes the set of options the calling program wants to affect
|
|
the operation of diffcore library with.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Notable members are:</p>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>output_format</code></dt>
|
|
<dd>
|
|
<p>The output format used when <code>diff_flush()</code> is run.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>context</code></dt>
|
|
<dd>
|
|
<p>Number of context lines to generate in patch output.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>break_opt</code>, <code>detect_rename</code>, <code>rename-score</code>, <code>rename_limit</code></dt>
|
|
<dd>
|
|
<p>Affects the way detection logic for complete rewrites, renames
|
|
and copies.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>abbrev</code></dt>
|
|
<dd>
|
|
<p>Number of hexdigits to abbreviate raw format output to.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>pickaxe</code></dt>
|
|
<dd>
|
|
<p>A constant string (can and typically does contain newlines to
|
|
look for a block of text, not just a single line) to filter out
|
|
the filepairs that do not change the number of strings contained
|
|
in its preimage and postimage of the diff_queue.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>flags</code></dt>
|
|
<dd>
|
|
<p>This is mostly a collection of boolean options that affects the
|
|
operation, but some do not have anything to do with the diffcore
|
|
library.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>touched_flags</code></dt>
|
|
<dd>
|
|
<p>Records whether a flag has been changed due to user request
|
|
(rather than just set/unset by default).</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>set_default</code></dt>
|
|
<dd>
|
|
<p>Callback which allows tweaking the options in diff_setup_done().</p>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1">BINARY, TEXT</dt>
|
|
<dd>
|
|
<p>Affects the way how a file that is seemingly binary is treated.</p>
|
|
</dd>
|
|
<dt class="hdlist1">FULL_INDEX</dt>
|
|
<dd>
|
|
<p>Tells the patch output format not to use abbreviated object
|
|
names on the "index" lines.</p>
|
|
</dd>
|
|
<dt class="hdlist1">FIND_COPIES_HARDER</dt>
|
|
<dd>
|
|
<p>Tells the diffcore library that the caller is feeding unchanged
|
|
filepairs to allow copies from unmodified files be detected.</p>
|
|
</dd>
|
|
<dt class="hdlist1">COLOR_DIFF</dt>
|
|
<dd>
|
|
<p>Output should be colored.</p>
|
|
</dd>
|
|
<dt class="hdlist1">COLOR_DIFF_WORDS</dt>
|
|
<dd>
|
|
<p>Output is a colored word-diff.</p>
|
|
</dd>
|
|
<dt class="hdlist1">NO_INDEX</dt>
|
|
<dd>
|
|
<p>Tells diff-files that the input is not tracked files but files
|
|
in random locations on the filesystem.</p>
|
|
</dd>
|
|
<dt class="hdlist1">ALLOW_EXTERNAL</dt>
|
|
<dd>
|
|
<p>Tells output routine that it is Ok to call user specified patch
|
|
output routine. Plumbing disables this to ensure stable output.</p>
|
|
</dd>
|
|
<dt class="hdlist1">QUIET</dt>
|
|
<dd>
|
|
<p>Do not show any output.</p>
|
|
</dd>
|
|
<dt class="hdlist1">REVERSE_DIFF</dt>
|
|
<dd>
|
|
<p>Tells the library that the calling program is feeding the
|
|
filepairs reversed; <code>one</code> is two, and <code>two</code> is one.</p>
|
|
</dd>
|
|
<dt class="hdlist1">EXIT_WITH_STATUS</dt>
|
|
<dd>
|
|
<p>For communication between the calling program and the options
|
|
parser; tell the calling program to signal the presence of
|
|
difference using program exit code.</p>
|
|
</dd>
|
|
<dt class="hdlist1">HAS_CHANGES</dt>
|
|
<dd>
|
|
<p>Internal; used for optimization to see if there is any change.</p>
|
|
</dd>
|
|
<dt class="hdlist1">SILENT_ON_REMOVE</dt>
|
|
<dd>
|
|
<p>Affects if diff-files shows removed files.</p>
|
|
</dd>
|
|
<dt class="hdlist1">RECURSIVE, TREE_IN_RECURSIVE</dt>
|
|
<dd>
|
|
<p>Tells if tree traversal done by tree-diff should recursively
|
|
descend into a tree object pair that are different in preimage
|
|
and postimage set.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>(JC)</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2019-02-26 19:31:11 UTC
|
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|
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