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<body class="manpage">
<div id="header">
<h1>gitdiffcore(7) Manual Page</h1>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>gitdiffcore - Tweaking diff output</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>git diff</em> *</pre>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The diff commands <em>git diff-index</em>, <em>git diff-files</em>, and <em>git diff-tree</em>
can be told to manipulate differences they find in
unconventional ways before showing <em>diff</em> output.  The manipulation
is collectively called "diffcore transformation".  This short note
describes what they are and how to use them to produce <em>diff</em> output
that is easier to understand than the conventional kind.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_the_chain_of_operation">The chain of operation</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <em>git diff-*</em> family works by first comparing two sets of
files:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><em>git diff-index</em> compares contents of a "tree" object and the
working directory (when <code>--cached</code> flag is not used) or a
"tree" object and the index file (when <code>--cached</code> flag is
used);</p>
</li>
<li>
<p><em>git diff-files</em> compares contents of the index file and the
working directory;</p>
</li>
<li>
<p><em>git diff-tree</em> compares contents of two "tree" objects;</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>In all of these cases, the commands themselves first optionally limit
the two sets of files by any pathspecs given on their command-lines,
and compare corresponding paths in the two resulting sets of files.</p>
</div>
<div class="paragraph">
<p>The pathspecs are used to limit the world diff operates in.  They remove
the filepairs outside the specified sets of pathnames.  E.g. If the
input set of filepairs included:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 100644 bcd1234... 0123456... M junkfile</pre>
</div>
</div>
<div class="paragraph">
<p>but the command invocation was <code>git</code> <code>diff-files</code> <code>myfile</code>, then the
junkfile entry would be removed from the list because only "myfile"
is under consideration.</p>
</div>
<div class="paragraph">
<p>The result of comparison is passed from these commands to what is
internally called "diffcore", in a format similar to what is output
when the -p option is not used.  E.g.</p>
</div>
<div class="listingblock">
<div class="content">
<pre>in-place edit  :100644 100644 bcd1234... 0123456... M file0
create         :000000 100644 0000000... 1234567... A file4
delete         :100644 000000 1234567... 0000000... D file5
unmerged       :000000 000000 0000000... 0000000... U file6</pre>
</div>
</div>
<div class="paragraph">
<p>The diffcore mechanism is fed a list of such comparison results
(each of which is called "filepair", although at this point each
of them talks about a single file), and transforms such a list
into another list.  There are currently 5 such transformations:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>diffcore-break</p>
</li>
<li>
<p>diffcore-rename</p>
</li>
<li>
<p>diffcore-merge-broken</p>
</li>
<li>
<p>diffcore-pickaxe</p>
</li>
<li>
<p>diffcore-order</p>
</li>
<li>
<p>diffcore-rotate</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>These are applied in sequence.  The set of filepairs <em>git diff-*</em>
commands find are used as the input to diffcore-break, and
the output from diffcore-break is used as the input to the
next transformation.  The final result is then passed to the
output routine and generates either diff-raw format (see Output
format sections of the manual for <em>git diff-*</em> commands) or
diff-patch format.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_diffcore_break_for_splitting_up_complete_rewrites">diffcore-break: For Splitting Up Complete Rewrites</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The second transformation in the chain is diffcore-break, and is
controlled by the -B option to the <em>git diff-*</em> commands.  This is
used to detect a filepair that represents "complete rewrite" and
break such filepair into two filepairs that represent delete and
create.  E.g.  If the input contained this filepair:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 100644 bcd1234... 0123456... M file0</pre>
</div>
</div>
<div class="paragraph">
<p>and if it detects that the file "file0" is completely rewritten,
it changes it to:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 000000 bcd1234... 0000000... D file0
:000000 100644 0000000... 0123456... A file0</pre>
</div>
</div>
<div class="paragraph">
<p>For the purpose of breaking a filepair, diffcore-break examines
the extent of changes between the contents of the files before
and after modification (i.e. the contents that have "bcd1234&#8230;&#8203;"
and "0123456&#8230;&#8203;" as their SHA-1 content ID, in the above
example).  The amount of deletion of original contents and
insertion of new material are added together, and if it exceeds
the "break score", the filepair is broken into two.  The break
score defaults to 50% of the size of the smaller of the original
and the result (i.e. if the edit shrinks the file, the size of
the result is used; if the edit lengthens the file, the size of
the original is used), and can be customized by giving a number
after "-B" option (e.g. "-B75" to tell it to use 75%).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_diffcore_rename_for_detecting_renames_and_copies">diffcore-rename: For Detecting Renames and Copies</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This transformation is used to detect renames and copies, and is
controlled by the -M option (to detect renames) and the -C option
(to detect copies as well) to the <em>git diff-*</em> commands.  If the
input contained these filepairs:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 000000 0123456... 0000000... D fileX
:000000 100644 0000000... 0123456... A file0</pre>
</div>
</div>
<div class="paragraph">
<p>and the contents of the deleted file fileX is similar enough to
the contents of the created file file0, then rename detection
merges these filepairs and creates:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 100644 0123456... 0123456... R100 fileX file0</pre>
</div>
</div>
<div class="paragraph">
<p>When the "-C" option is used, the original contents of modified files,
and deleted files (and also unmodified files, if the
"--find-copies-harder" option is used) are considered as candidates
of the source files in rename/copy operation.  If the input were like
these filepairs, that talk about a modified file fileY and a newly
created file file0:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 100644 0123456... 1234567... M fileY
:000000 100644 0000000... bcd3456... A file0</pre>
</div>
</div>
<div class="paragraph">
<p>the original contents of fileY and the resulting contents of
file0 are compared, and if they are similar enough, they are
changed to:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>:100644 100644 0123456... 1234567... M fileY
:100644 100644 0123456... bcd3456... C100 fileY file0</pre>
</div>
</div>
<div class="paragraph">
<p>In both rename and copy detection, the same "extent of changes"
algorithm used in diffcore-break is used to determine if two
files are "similar enough", and can be customized to use
a similarity score different from the default of 50% by giving a
number after the "-M" or "-C" option (e.g. "-M8" to tell it to use
8/10 = 80%).</p>
</div>
<div class="paragraph">
<p>Note that when rename detection is on but both copy and break
detection are off, rename detection adds a preliminary step that first
checks if files are moved across directories while keeping their
filename the same.  If there is a file added to a directory whose
contents are sufficiently similar to a file with the same name that got
deleted from a different directory, it will mark them as renames and
exclude them from the later quadratic step (the one that pairwise
compares all unmatched files to find the "best" matches, determined by
the highest content similarity).  So, for example, if a deleted
docs/ext.txt and an added docs/config/ext.txt are similar enough, they
will be marked as a rename and prevent an added docs/ext.md that may
be even more similar to the deleted docs/ext.txt from being considered
as the rename destination in the later step.  For this reason, the
preliminary "match same filename" step uses a bit higher threshold to
mark a file pair as a rename and stop considering other candidates for
better matches.  At most, one comparison is done per file in this
preliminary pass; so if there are several remaining ext.txt files
throughout the directory hierarchy after exact rename detection, this
preliminary step may be skipped for those files.</p>
</div>
<div class="paragraph">
<p>Note.  When the "-C" option is used with <code>--find-copies-harder</code>
option, <em>git diff-*</em> commands feed unmodified filepairs to
diffcore mechanism as well as modified ones.  This lets the copy
detector consider unmodified files as copy source candidates at
the expense of making it slower.  Without <code>--find-copies-harder</code>,
<em>git diff-*</em> commands can detect copies only if the file that was
copied happened to have been modified in the same changeset.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_diffcore_merge_broken_for_putting_complete_rewrites_back_together">diffcore-merge-broken: For Putting Complete Rewrites Back Together</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This transformation is used to merge filepairs broken by
diffcore-break, and not transformed into rename/copy by
diffcore-rename, back into a single modification.  This always
runs when diffcore-break is used.</p>
</div>
<div class="paragraph">
<p>For the purpose of merging broken filepairs back, it uses a
different "extent of changes" computation from the ones used by
diffcore-break and diffcore-rename.  It counts only the deletion
from the original, and does not count insertion.  If you removed
only 10 lines from a 100-line document, even if you added 910
new lines to make a new 1000-line document, you did not do a
complete rewrite.  diffcore-break breaks such a case in order to
help diffcore-rename to consider such filepairs as a candidate of
rename/copy detection, but if filepairs broken that way were not
matched with other filepairs to create rename/copy, then this
transformation merges them back into the original
"modification".</p>
</div>
<div class="paragraph">
<p>The "extent of changes" parameter can be tweaked from the
default 80% (that is, unless more than 80% of the original
material is deleted, the broken pairs are merged back into a
single modification) by giving a second number to -B option,
like these:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>-B50/60 (give 50% "break score" to diffcore-break, use 60%
for diffcore-merge-broken).</p>
</li>
<li>
<p>-B/60 (the same as above, since diffcore-break defaults to 50%).</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Note that earlier implementation left a broken pair as separate
creation and deletion patches.  This was an unnecessary hack, and
the latest implementation always merges all the broken pairs
back into modifications, but the resulting patch output is
formatted differently for easier review in case of such
a complete rewrite by showing the entire contents of the old version
prefixed with <em>-</em>, followed by the entire contents of the new
version prefixed with <em>+</em>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_diffcore_pickaxe_for_detecting_additiondeletion_of_specified_string">diffcore-pickaxe: For Detecting Addition/Deletion of Specified String</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This transformation limits the set of filepairs to those that change
specified strings between the preimage and the postimage in a certain
way.  -S&lt;block-of-text&gt; and -G&lt;regular-expression&gt; options are used to
specify different ways these strings are sought.</p>
</div>
<div class="paragraph">
<p>"-S&lt;block-of-text&gt;" detects filepairs whose preimage and postimage
have different number of occurrences of the specified block of text.
By definition, it will not detect in-file moves.  Also, when a
changeset moves a file wholesale without affecting the interesting
string, diffcore-rename kicks in as usual, and <code>-S</code> omits the filepair
(since the number of occurrences of that string didn&#8217;t change in that
rename-detected filepair).  When used with <code>--pickaxe-regex</code>, treat
the &lt;block-of-text&gt; as an extended POSIX regular expression to match,
instead of a literal string.</p>
</div>
<div class="paragraph">
<p>"-G&lt;regular-expression&gt;" (mnemonic: grep) detects filepairs whose
textual diff has an added or a deleted line that matches the given
regular expression.  This means that it will detect in-file (or what
rename-detection considers the same file) moves, which is noise.  The
implementation runs diff twice and greps, and this can be quite
expensive.  To speed things up, binary files without textconv filters
will be ignored.</p>
</div>
<div class="paragraph">
<p>When <code>-S</code> or <code>-G</code> are used without <code>--pickaxe-all</code>, only filepairs
that match their respective criterion are kept in the output.  When
<code>--pickaxe-all</code> is used, if even one filepair matches their respective
criterion in a changeset, the entire changeset is kept.  This behavior
is designed to make reviewing changes in the context of the whole
changeset easier.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_diffcore_order_for_sorting_the_output_based_on_filenames">diffcore-order: For Sorting the Output Based on Filenames</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This is used to reorder the filepairs according to the user&#8217;s
(or project&#8217;s) taste, and is controlled by the -O option to the
<em>git diff-*</em> commands.</p>
</div>
<div class="paragraph">
<p>This takes a text file each of whose lines is a shell glob
pattern.  Filepairs that match a glob pattern on an earlier line
in the file are output before ones that match a later line, and
filepairs that do not match any glob pattern are output last.</p>
</div>
<div class="paragraph">
<p>As an example, a typical orderfile for the core Git probably
would look like this:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>README
Makefile
Documentation
*.h
*.c
t</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_diffcore_rotate_for_changing_at_which_path_output_starts">diffcore-rotate: For Changing At Which Path Output Starts</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This transformation takes one pathname, and rotates the set of
filepairs so that the filepair for the given pathname comes first,
optionally discarding the paths that come before it.  This is used
to implement the <code>--skip-to</code> and the <code>--rotate-to</code> options.  It is
an error when the specified pathname is not in the set of filepairs,
but it is not useful to error out when used with "git log" family of
commands, because it is unreasonable to expect that a given path
would be modified by each and every commit shown by the "git log"
command.  For this reason, when used with "git log", the filepair
that sorts the same as, or the first one that sorts after, the given
pathname is where the output starts.</p>
</div>
<div class="paragraph">
<p>Use of this transformation combined with diffcore-order will produce
unexpected results, as the input to this transformation is likely
not sorted when diffcore-order is in effect.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="git-diff.html">git-diff(1)</a>,
<a href="git-diff-files.html">git-diff-files(1)</a>,
<a href="git-diff-index.html">git-diff-index(1)</a>,
<a href="git-diff-tree.html">git-diff-tree(1)</a>,
<a href="git-format-patch.html">git-format-patch(1)</a>,
<a href="git-log.html">git-log(1)</a>,
<a href="gitglossary.html">gitglossary(7)</a>,
<a href="user-manual.html">The Git User&#8217;s Manual</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Part of the <a href="git.html">git(1)</a> suite</p>
</div>
</div>
</div>
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