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<body class="article">
<div id="header">
<h1>gitattributes API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>gitattributes mechanism gives a uniform way to associate various
attributes to set of paths.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_data_structure">Data Structure</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
<code>struct git_attr</code>
</dt>
<dd>
<p>
An attribute is an opaque object that is identified by its name.
Pass the name to <code>git_attr()</code> function to obtain the object of
this type. The internal representation of this structure is
of no interest to the calling programs. The name of the
attribute can be retrieved by calling <code>git_attr_name()</code>.
</p>
</dd>
<dt class="hdlist1">
<code>struct attr_check_item</code>
</dt>
<dd>
<p>
This structure represents one attribute and its value.
</p>
</dd>
<dt class="hdlist1">
<code>struct attr_check</code>
</dt>
<dd>
<p>
This structure represents a collection of <code>attr_check_item</code>.
It is passed to <code>git_check_attr()</code> function, specifying the
attributes to check, and receives their values.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_attribute_values">Attribute Values</h2>
<div class="sectionbody">
<div class="paragraph"><p>An attribute for a path can be in one of four states: Set, Unset,
Unspecified or set to a string, and <code>.value</code> member of <code>struct
attr_check_item</code> records it. There are three macros to check these:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>ATTR_TRUE()</code>
</dt>
<dd>
<p>
Returns true if the attribute is Set for the path.
</p>
</dd>
<dt class="hdlist1">
<code>ATTR_FALSE()</code>
</dt>
<dd>
<p>
Returns true if the attribute is Unset for the path.
</p>
</dd>
<dt class="hdlist1">
<code>ATTR_UNSET()</code>
</dt>
<dd>
<p>
Returns true if the attribute is Unspecified for the path.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>If none of the above returns true, <code>.value</code> member points at a string
value of the attribute for the path.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_querying_specific_attributes">Querying Specific Attributes</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Prepare <code>struct attr_check</code> using attr_check_initl()
function, enumerating the names of attributes whose values you are
interested in, terminated with a NULL pointer. Alternatively, an
empty <code>struct attr_check</code> can be prepared by calling
<code>attr_check_alloc()</code> function and then attributes you want to
ask about can be added to it with <code>attr_check_append()</code>
function.
</p>
</li>
<li>
<p>
Call <code>git_check_attr()</code> to check the attributes for the path.
</p>
</li>
<li>
<p>
Inspect <code>attr_check</code> structure to see how each of the
attribute in the array is defined for the path.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_example">Example</h2>
<div class="sectionbody">
<div class="paragraph"><p>To see how attributes "crlf" and "ident" are set for different paths.</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Prepare a <code>struct attr_check</code> with two elements (because
we are checking two attributes):
</p>
</li>
</ol></div>
<div class="listingblock">
<div class="content">
<pre><code>static struct attr_check *check;
static void setup_check(void)
{
if (check)
return; /* already done */
check = attr_check_initl("crlf", "ident", NULL);
}</code></pre>
</div></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Call <code>git_check_attr()</code> with the prepared <code>struct attr_check</code>:
</p>
</li>
</ol></div>
<div class="listingblock">
<div class="content">
<pre><code> const char *path;
setup_check();
git_check_attr(path, check);</code></pre>
</div></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Act on <code>.value</code> member of the result, left in <code>check-&gt;items[]</code>:
</p>
</li>
</ol></div>
<div class="listingblock">
<div class="content">
<pre><code> const char *value = check-&gt;items[0].value;
if (ATTR_TRUE(value)) {
The attribute is Set, by listing only the name of the
attribute in the gitattributes file for the path.
} else if (ATTR_FALSE(value)) {
The attribute is Unset, by listing the name of the
attribute prefixed with a dash - for the path.
} else if (ATTR_UNSET(value)) {
The attribute is neither set nor unset for the path.
} else if (!strcmp(value, "input")) {
If none of ATTR_TRUE(), ATTR_FALSE(), or ATTR_UNSET() is
true, the value is a string set in the gitattributes
file for the path by saying "attr=value".
} else if (... other check using value as string ...) {
...
}</code></pre>
</div></div>
<div class="paragraph"><p>To see how attributes in argv[] are set for different paths, only
the first step in the above would be different.</p></div>
<div class="listingblock">
<div class="content">
<pre><code>static struct attr_check *check;
static void setup_check(const char **argv)
{
check = attr_check_alloc();
while (*argv) {
struct git_attr *attr = git_attr(*argv);
attr_check_append(check, attr);
argv++;
}
}</code></pre>
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_querying_all_attributes">Querying All Attributes</h2>
<div class="sectionbody">
<div class="paragraph"><p>To get the values of all attributes associated with a file:</p></div>
<div class="ulist"><ul>
<li>
<p>
Prepare an empty <code>attr_check</code> structure by calling
<code>attr_check_alloc()</code>.
</p>
</li>
<li>
<p>
Call <code>git_all_attrs()</code>, which populates the <code>attr_check</code>
with the attributes attached to the path.
</p>
</li>
<li>
<p>
Iterate over the <code>attr_check.items[]</code> array to examine
the attribute names and values. The name of the attribute
described by an <code>attr_check.items[]</code> object can be retrieved via
<code>git_attr_name(check-&gt;items[i].attr)</code>. (Please note that no items
will be returned for unset attributes, so <code>ATTR_UNSET()</code> will return
false for all returned <code>attr_check.items[]</code> objects.)
</p>
</li>
<li>
<p>
Free the <code>attr_check</code> struct by calling <code>attr_check_free()</code>.
</p>
</li>
</ul></div>
</div>
</div>
</div>
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Last updated
2018-07-19 05:16:04 JST
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