thodg/libgit2/src/iterator.h

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• Hash : 7e000ab2
  Author :
  Date : 2012-05-08T15:03:59
  

  Add support for diffing index with no HEAD When a repo is first created, there is no HEAD yet and attempting to diff files in the index was showing nothing because a tree iterator could not be constructed. This adds an "empty" iterator and falls back on that when the head cannot be looked up.

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• src/iterator.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_iterator_h__
  #define INCLUDE_iterator_h__
  
  #include "common.h"
  #include "git2/index.h"
  
  typedef struct git_iterator git_iterator;
  
  typedef enum {
  	GIT_ITERATOR_EMPTY = 0,
  	GIT_ITERATOR_TREE = 1,
  	GIT_ITERATOR_INDEX = 2,
  	GIT_ITERATOR_WORKDIR = 3
  } git_iterator_type_t;
  
  struct git_iterator {
  	git_iterator_type_t type;
  	int (*current)(git_iterator *, const git_index_entry **);
  	int (*at_end)(git_iterator *);
  	int (*advance)(git_iterator *, const git_index_entry **);
  	int (*reset)(git_iterator *);
  	void (*free)(git_iterator *);
  };
  
  int git_iterator_for_nothing(git_iterator **iter);
  
  int git_iterator_for_tree(
  	git_repository *repo, git_tree *tree, git_iterator **iter);
  
  int git_iterator_for_index(
  	git_repository *repo, git_iterator **iter);
  
  int git_iterator_for_workdir(
  	git_repository *repo, git_iterator **iter);
  
  /* Entry is not guaranteed to be fully populated.  For a tree iterator,
   * we will only populate the mode, oid and path, for example.  For a workdir
   * iterator, we will not populate the oid.
   *
   * You do not need to free the entry.  It is still "owned" by the iterator.
   * Once you call `git_iterator_advance`, then content of the old entry is
   * no longer guaranteed to be valid.
   */
  GIT_INLINE(int) git_iterator_current(
  	git_iterator *iter, const git_index_entry **entry)
  {
  	return iter->current(iter, entry);
  }
  
  GIT_INLINE(int) git_iterator_at_end(git_iterator *iter)
  {
  	return iter->at_end(iter);
  }
  
  GIT_INLINE(int) git_iterator_advance(
  	git_iterator *iter, const git_index_entry **entry)
  {
  	return iter->advance(iter, entry);
  }
  
  GIT_INLINE(int) git_iterator_reset(git_iterator *iter)
  {
  	return iter->reset(iter);
  }
  
  GIT_INLINE(void) git_iterator_free(git_iterator *iter)
  {
  	iter->free(iter);
  	git__free(iter);
  }
  
  GIT_INLINE(git_iterator_type_t) git_iterator_type(git_iterator *iter)
  {
  	return iter->type;
  }
  
  extern int git_iterator_current_tree_entry(
  	git_iterator *iter, const git_tree_entry **tree_entry);
  
  extern int git_iterator_current_is_ignored(git_iterator *iter);
  
  /**
   * Iterate into a workdir directory.
   *
   * Workdir iterators do not automatically descend into directories (so that
   * when comparing two iterator entries you can detect a newly created
   * directory in the workdir).  As a result, you may get S_ISDIR items from
   * a workdir iterator.  If you wish to iterate over the contents of the
   * directories you encounter, then call this function when you encounter
   * a directory.
   *
   * If there are no files in the directory, this will end up acting like a
   * regular advance and will skip past the directory, so you should be
   * prepared for that case.
   *
   * On non-workdir iterators or if not pointing at a directory, this is a
   * no-op and will not advance the iterator.
   */
  extern int git_iterator_advance_into_directory(
  	git_iterator *iter, const git_index_entry **entry);
  
  #endif
  

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