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/*
* Copyright (C) 2009-2011 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_revwalk_h__
#define INCLUDE_git_revwalk_h__
#include "common.h"
#include "types.h"
#include "oid.h"
/**
* @file git2/revwalk.h
* @brief Git revision traversal routines
* @defgroup git_revwalk Git revision traversal routines
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/**
* Sort the repository contents in no particular ordering;
* this sorting is arbitrary, implementation-specific
* and subject to change at any time.
* This is the default sorting for new walkers.
*/
#define GIT_SORT_NONE (0)
/**
* Sort the repository contents in topological order
* (parents before children); this sorting mode
* can be combined with time sorting.
*/
#define GIT_SORT_TOPOLOGICAL (1 << 0)
/**
* Sort the repository contents by commit time;
* this sorting mode can be combined with
* topological sorting.
*/
#define GIT_SORT_TIME (1 << 1)
/**
* Iterate through the repository contents in reverse
* order; this sorting mode can be combined with
* any of the above.
*/
#define GIT_SORT_REVERSE (1 << 2)
/**
* Allocate a new revision walker to iterate through a repo.
*
* This revision walker uses a custom memory pool and an internal
* commit cache, so it is relatively expensive to allocate.
*
* For maximum performance, this revision walker should be
* reused for different walks.
*
* This revision walker is *not* thread safe: it may only be
* used to walk a repository on a single thread; however,
* it is possible to have several revision walkers in
* several different threads walking the same repository.
*
* @param walker pointer to the new revision walker
* @param repo the repo to walk through
* @return GIT_SUCCESS or an error code
*/
GIT_EXTERN(int) git_revwalk_new(git_revwalk **walker, git_repository *repo);
/**
* Reset the revision walker for reuse.
*
* This will clear all the pushed and hidden commits, and
* leave the walker in a blank state (just like at
* creation) ready to receive new commit pushes and
* start a new walk.
*
* The revision walk is automatically reset when a walk
* is over.
*
* @param walker handle to reset.
*/
GIT_EXTERN(void) git_revwalk_reset(git_revwalk *walker);
/**
* Mark a commit to start traversal from.
*
* The given OID must belong to a commit on the walked
* repository.
*
* The given commit will be used as one of the roots
* when starting the revision walk. At least one commit
* must be pushed the repository before a walk can
* be started.
*
* @param walk the walker being used for the traversal.
* @param oid the oid of the commit to start from.
* @return GIT_SUCCESS or an error code
*/
GIT_EXTERN(int) git_revwalk_push(git_revwalk *walk, const git_oid *oid);
/**
* Mark a commit (and its ancestors) uninteresting for the output.
*
* The given OID must belong to a commit on the walked
* repository.
*
* The resolved commit and all its parents will be hidden from the
* output on the revision walk.
*
* @param walk the walker being used for the traversal.
* @param oid the oid of commit that will be ignored during the traversal
* @return GIT_SUCCESS or an error code
*/
GIT_EXTERN(int) git_revwalk_hide(git_revwalk *walk, const git_oid *oid);
/**
* Get the next commit from the revision walk.
*
* The initial call to this method is *not* blocking when
* iterating through a repo with a time-sorting mode.
*
* Iterating with Topological or inverted modes makes the initial
* call blocking to preprocess the commit list, but this block should be
* mostly unnoticeable on most repositories (topological preprocessing
* times at 0.3s on the git.git repo).
*
* The revision walker is reset when the walk is over.
*
* @param oid Pointer where to store the oid of the next commit
* @param walk the walker to pop the commit from.
* @return GIT_SUCCESS if the next commit was found;
* GIT_EREVWALKOVER if there are no commits left to iterate
*/
GIT_EXTERN(int) git_revwalk_next(git_oid *oid, git_revwalk *walk);
/**
* Change the sorting mode when iterating through the
* repository's contents.
*
* Changing the sorting mode resets the walker.
*
* @param walk the walker being used for the traversal.
* @param sort_mode combination of GIT_SORT_XXX flags
*/
GIT_EXTERN(void) git_revwalk_sorting(git_revwalk *walk, unsigned int sort_mode);
/**
* Free a revision walker previously allocated.
*
* @param walk traversal handle to close. If NULL nothing occurs.
*/
GIT_EXTERN(void) git_revwalk_free(git_revwalk *walk);
/**
* Return the repository on which this walker
* is operating.
*
* @param walk the revision walker
* @return the repository being walked
*/
GIT_EXTERN(git_repository *) git_revwalk_repository(git_revwalk *walk);
/** @} */
GIT_END_DECL
#endif
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