thodg/libgit2/include/git2/attr.h

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• Hash : c63793ee
  Author :
  Date : 2012-03-02T03:51:45
  

  attr: Change the attribute check macros The point of having `GIT_ATTR_TRUE` and `GIT_ATTR_FALSE` macros is to be able to change the way that true and false values are stored inside of the returned gitattributes value pointer. However, if these macros are implemented as a simple rename for the `git_attr__true` pointer, they will always be used with the `==` operator, and hence we cannot really change the implementation to any other way that doesn't imply using special pointer values and comparing them! We need to do the same thing that core Git does, which is using a function macro. With `GIT_ATTR_TRUE(attr)`, we can change internally the way that these values are stored to anything we want. This commit does that, and rewrites a large chunk of the attributes test suite to remove duplicated code for expected attributes, and to properly test the function macro behavior instead of comparing pointers.

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• include/git2/attr.h

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_git_attr_h__
  #define INCLUDE_git_attr_h__
  
  #include "common.h"
  #include "types.h"
  
  /**
   * @file git2/attr.h
   * @brief Git attribute management routines
   * @defgroup git_attr Git attribute management routines
   * @ingroup Git
   * @{
   */
  GIT_BEGIN_DECL
  
  #define GIT_ATTR_TRUE(attr)		((attr) == git_attr__true)
  #define GIT_ATTR_FALSE(attr)	((attr) == git_attr__false)
  #define GIT_ATTR_UNSPECIFIED(attr)	((attr) == NULL)
  
  GIT_EXTERN(const char *) git_attr__true;
  GIT_EXTERN(const char *) git_attr__false;
  
  
  /**
   * Lookup attribute for path returning string caller must free
   */
  GIT_EXTERN(int) git_attr_get(
      git_repository *repo, const char *path, const char *name,
  	const char **value);
  
  /**
   * Lookup list of attributes for path, populating array of strings
   */
  GIT_EXTERN(int) git_attr_get_many(
      git_repository *repo, const char *path,
      size_t num_attr, const char **names,
  	const char **values);
  
  /**
   * Perform an operation on each attribute of a path.
   */
  GIT_EXTERN(int) git_attr_foreach(
      git_repository *repo, const char *path,
  	int (*callback)(const char *name, const char *value, void *payload),
  	void *payload);
  
  /**
   * Flush the gitattributes cache.
   *
   * Call this if you have reason to believe that the attributes files
   * on disk no longer match the cached contents of memory.
   */
  GIT_EXTERN(void) git_attr_cache_flush(
  	git_repository *repo);
  
  /**
   * Add a macro definition.
   *
   * Macros will automatically be loaded from the top level .gitattributes
   * file of the repository (plus the build-in "binary" macro).  This
   * function allows you to add others.  For example, to add the default
   * macro, you would call:
   *
   *    git_attr_add_macro(repo, "binary", "-diff -crlf");
   */
  GIT_EXTERN(int) git_attr_add_macro(
  	git_repository *repo,
  	const char *name,
  	const char *values);
  
  /** @} */
  GIT_END_DECL
  #endif
  
  

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