technical/api-gitattributes.html - external/gitster/git-htmldocs - Git at Google

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 </style>
 <title>gitattributes API</title>
 </head>
 <body>
 <div id="header">
 <h1>gitattributes API</h1>
 </div>
 <div id="preamble">
 <div class="sectionbody">
 <div class="para"><p>gitattributes mechanism gives a uniform way to associate various
 attributes to set of paths.</p></div>
 </div>
 </div>
 <h2 id="_data_structure">Data Structure</h2>
 <div class="sectionbody">
 <div class="vlist"><dl>
 <dt>
 <tt>struct git_attr</tt>
 </dt>
 <dd>
 <p>
  An attribute is an opaque object that is identified by its name.
  Pass the name and its length to <tt>git_attr()</tt> function to obtain
  the object of this type. The internal representation of this
  structure is of no interest to the calling programs.
 </p>
 </dd>
 <dt>
 <tt>struct git_attr_check</tt>
 </dt>
 <dd>
 <p>
  This structure represents a set of attributes to check in a call
  to <tt>git_checkattr()</tt> function, and receives the results.
 </p>
 </dd>
 </dl></div>
 </div>
 <h2 id="_calling_sequence">Calling Sequence</h2>
 <div class="sectionbody">
 <div class="ilist"><ul>
 <li>
 <p>
 Prepare an array of <tt>struct git_attr_check</tt> to define the list of
  attributes you would want to check. To populate this array, you would
  need to define necessary attributes by calling <tt>git_attr()</tt> function.
 </p>
 </li>
 <li>
 <p>
 Call git_checkattr() to check the attributes for the path.
 </p>
 </li>
 <li>
 <p>
 Inspect <tt>git_attr_check</tt> structure to see how each of the attribute in
  the array is defined for the path.
 </p>
 </li>
 </ul></div>
 </div>
 <h2 id="_attribute_values">Attribute Values</h2>
 <div class="sectionbody">
 <div class="para"><p>An attribute for a path can be in one of four states: Set, Unset,
 Unspecified or set to a string, and <tt>.value</tt> member of <tt>struct
 git_attr_check</tt> records it. There are three macros to check these:</p></div>
 <div class="vlist"><dl>
 <dt>
 <tt>ATTR_TRUE()</tt>
 </dt>
 <dd>
 <p>
  Returns true if the attribute is Set for the path.
 </p>
 </dd>
 <dt>
 <tt>ATTR_FALSE()</tt>
 </dt>
 <dd>
 <p>
  Returns true if the attribute is Unset for the path.
 </p>
 </dd>
 <dt>
 <tt>ATTR_UNSET()</tt>
 </dt>
 <dd>
 <p>
  Returns true if the attribute is Unspecified for the path.
 </p>
 </dd>
 </dl></div>
 <div class="para"><p>If none of the above returns true, <tt>.value</tt> member points at a string
 value of the attribute for the path.</p></div>
 </div>
 <h2 id="_example">Example</h2>
 <div class="sectionbody">
 <div class="para"><p>To see how attributes "crlf" and "indent" are set for different paths.</p></div>
 <div class="olist"><ol>
 <li>
 <p>
 Prepare an array of <tt>struct git_attr_check</tt> with two elements (because
  we are checking two attributes). Initialize their <tt>attr</tt> member with
  pointers to <tt>struct git_attr</tt> obtained by calling <tt>git_attr()</tt>:
 </p>
 </li>
 </ol></div>
 <div class="listingblock">
 <div class="content">
 <pre><tt>static struct git_attr_check check[2];
 static void setup_check(void)
 {
  if (check[0].attr)
  return; /* already done */
  check[0].attr = git_attr("crlf", 4);
  check[1].attr = git_attr("ident", 5);
 }</tt></pre>
 </div></div>
 <div class="olist"><ol>
 <li>
 <p>
 Call <tt>git_checkattr()</tt> with the prepared array of <tt>struct git_attr_check</tt>:
 </p>
 </li>
 </ol></div>
 <div class="listingblock">
 <div class="content">
 <pre><tt> const char *path;

  setup_check();
  git_checkattr(path, ARRAY_SIZE(check), check);</tt></pre>
 </div></div>
 <div class="olist"><ol>
 <li>
 <p>
 Act on <tt>.value</tt> member of the result, left in <tt>check[]</tt>:
 </p>
 </li>
 </ol></div>
 <div class="listingblock">
 <div class="content">
 <pre><tt> const char *value = check[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 not 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 ...) {
  ...
  }</tt></pre>
 </div></div>
 <div class="para"><p>(JC)</p></div>
 </div>
 <div id="footer">
 <div id="footer-text">
 Last updated 2009-02-14 08:18:52 UTC
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	</style>
	<title>gitattributes API</title>
	</head>
	<body>
	<div id="header">
	<h1>gitattributes API</h1>
	</div>
	<div id="preamble">
	<div class="sectionbody">
	<div class="para"><p>gitattributes mechanism gives a uniform way to associate various
	attributes to set of paths.</p></div>
	</div>
	</div>
	<h2 id="_data_structure">Data Structure</h2>
	<div class="sectionbody">
	<div class="vlist"><dl>
	<dt>
	<tt>struct git_attr</tt>
	</dt>
	<dd>
	<p>
	An attribute is an opaque object that is identified by its name.
	Pass the name and its length to <tt>git_attr()</tt> function to obtain
	the object of this type. The internal representation of this
	structure is of no interest to the calling programs.
	</p>
	</dd>
	<dt>
	<tt>struct git_attr_check</tt>
	</dt>
	<dd>
	<p>
	This structure represents a set of attributes to check in a call
	to <tt>git_checkattr()</tt> function, and receives the results.
	</p>
	</dd>
	</dl></div>
	</div>
	<h2 id="_calling_sequence">Calling Sequence</h2>
	<div class="sectionbody">
	<div class="ilist"><ul>
	<li>
	<p>
	Prepare an array of <tt>struct git_attr_check</tt> to define the list of
	attributes you would want to check. To populate this array, you would
	need to define necessary attributes by calling <tt>git_attr()</tt> function.
	</p>
	</li>
	<li>
	<p>
	Call git_checkattr() to check the attributes for the path.
	</p>
	</li>
	<li>
	<p>
	Inspect <tt>git_attr_check</tt> structure to see how each of the attribute in
	the array is defined for the path.
	</p>
	</li>
	</ul></div>
	</div>
	<h2 id="_attribute_values">Attribute Values</h2>
	<div class="sectionbody">
	<div class="para"><p>An attribute for a path can be in one of four states: Set, Unset,
	Unspecified or set to a string, and <tt>.value</tt> member of <tt>struct
	git_attr_check</tt> records it. There are three macros to check these:</p></div>
	<div class="vlist"><dl>
	<dt>
	<tt>ATTR_TRUE()</tt>
	</dt>
	<dd>
	<p>
	Returns true if the attribute is Set for the path.
	</p>
	</dd>
	<dt>
	<tt>ATTR_FALSE()</tt>
	</dt>
	<dd>
	<p>
	Returns true if the attribute is Unset for the path.
	</p>
	</dd>
	<dt>
	<tt>ATTR_UNSET()</tt>
	</dt>
	<dd>
	<p>
	Returns true if the attribute is Unspecified for the path.
	</p>
	</dd>
	</dl></div>
	<div class="para"><p>If none of the above returns true, <tt>.value</tt> member points at a string
	value of the attribute for the path.</p></div>
	</div>
	<h2 id="_example">Example</h2>
	<div class="sectionbody">
	<div class="para"><p>To see how attributes "crlf" and "indent" are set for different paths.</p></div>
	<div class="olist"><ol>
	<li>
	<p>
	Prepare an array of <tt>struct git_attr_check</tt> with two elements (because
	we are checking two attributes). Initialize their <tt>attr</tt> member with
	pointers to <tt>struct git_attr</tt> obtained by calling <tt>git_attr()</tt>:
	</p>
	</li>
	</ol></div>
	<div class="listingblock">
	<div class="content">
	<pre><tt>static struct git_attr_check check[2];
	static void setup_check(void)
	{
	if (check[0].attr)
	return; /* already done */
	check[0].attr = git_attr("crlf", 4);
	check[1].attr = git_attr("ident", 5);
	}</tt></pre>
	</div></div>
	<div class="olist"><ol>
	<li>
	<p>
	Call <tt>git_checkattr()</tt> with the prepared array of <tt>struct git_attr_check</tt>:
	</p>
	</li>
	</ol></div>
	<div class="listingblock">
	<div class="content">
	<pre><tt> const char *path;

	setup_check();
	git_checkattr(path, ARRAY_SIZE(check), check);</tt></pre>
	</div></div>
	<div class="olist"><ol>
	<li>
	<p>
	Act on <tt>.value</tt> member of the result, left in <tt>check[]</tt>:
	</p>
	</li>
	</ol></div>
	<div class="listingblock">
	<div class="content">
	<pre><tt> const char *value = check[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 not 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 ...) {
	...
	}</tt></pre>
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	<div class="para"><p>(JC)</p></div>
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	Last updated 2009-02-14 08:18:52 UTC
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