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-gitattributes API
-=================
-
-gitattributes mechanism gives a uniform way to associate various
-attributes to set of paths.
-
-
-Data Structure
---------------
-
-`struct git_attr`::
-
- An attribute is an opaque object that is identified by its name.
- Pass the name to `git_attr()` 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 `git_attr_name()`.
-
-`struct attr_check_item`::
-
- This structure represents one attribute and its value.
-
-`struct attr_check`::
-
- This structure represents a collection of `attr_check_item`.
- It is passed to `git_check_attr()` function, specifying the
- attributes to check, and receives their values.
-
-
-Attribute Values
-----------------
-
-An attribute for a path can be in one of four states: Set, Unset,
-Unspecified or set to a string, and `.value` member of `struct
-attr_check_item` records it. There are three macros to check these:
-
-`ATTR_TRUE()`::
-
- Returns true if the attribute is Set for the path.
-
-`ATTR_FALSE()`::
-
- Returns true if the attribute is Unset for the path.
-
-`ATTR_UNSET()`::
-
- Returns true if the attribute is Unspecified for the path.
-
-If none of the above returns true, `.value` member points at a string
-value of the attribute for the path.
-
-
-Querying Specific Attributes
-----------------------------
-
-* Prepare `struct attr_check` using attr_check_initl()
- function, enumerating the names of attributes whose values you are
- interested in, terminated with a NULL pointer. Alternatively, an
- empty `struct attr_check` can be prepared by calling
- `attr_check_alloc()` function and then attributes you want to
- ask about can be added to it with `attr_check_append()`
- function.
-
-* Call `git_check_attr()` to check the attributes for the path.
-
-* Inspect `attr_check` structure to see how each of the
- attribute in the array is defined for the path.
-
-
-Example
--------
-
-To see how attributes "crlf" and "ident" are set for different paths.
-
-. Prepare a `struct attr_check` with two elements (because
- we are checking two attributes):
-
-------------
-static struct attr_check *check;
-static void setup_check(void)
-{
- if (check)
- return; /* already done */
- check = attr_check_initl("crlf", "ident", NULL);
-}
-------------
-
-. Call `git_check_attr()` with the prepared `struct attr_check`:
-
-------------
- const char *path;
-
- setup_check();
- git_check_attr(path, check);
-------------
-
-. Act on `.value` member of the result, left in `check->items[]`:
-
-------------
- const char *value = check->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 ...) {
- ...
- }
-------------
-
-To see how attributes in argv[] are set for different paths, only
-the first step in the above would be different.
-
-------------
-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++;
- }
-}
-------------
-
-
-Querying All Attributes
------------------------
-
-To get the values of all attributes associated with a file:
-
-* Prepare an empty `attr_check` structure by calling
- `attr_check_alloc()`.
-
-* Call `git_all_attrs()`, which populates the `attr_check`
- with the attributes attached to the path.
-
-* Iterate over the `attr_check.items[]` array to examine
- the attribute names and values. The name of the attribute
- described by an `attr_check.items[]` object can be retrieved via
- `git_attr_name(check->items[i].attr)`. (Please note that no items
- will be returned for unset attributes, so `ATTR_UNSET()` will return
- false for all returned `attr_check.items[]` objects.)
-
-* Free the `attr_check` struct by calling `attr_check_free()`.