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 /*
  * Copyright (C) the libgit2 contributors. All rights reserved.
  *
  * 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
 
 /**
  * Flags to specify the sorting which a revwalk should perform.
  */
 typedef enum {
     /**
      * Sort the output with the same default method from `git`: reverse
      * chronological order. This is the default sorting for new walkers.
      */
     GIT_SORT_NONE = 0,
 
     /**
      * Sort the repository contents in topological order (no parents before
      * all of its children are shown); this sorting mode can be combined
      * with time sorting to produce `git`'s `--date-order``.
      */
     GIT_SORT_TOPOLOGICAL = 1 << 0,
 
     /**
      * Sort the repository contents by commit time;
      * this sorting mode can be combined with
      * topological sorting.
      */
     GIT_SORT_TIME = 1 << 1,
 
     /**
      * Iterate through the repository contents in reverse
      * order; this sorting mode can be combined with
      * any of the above.
      */
     GIT_SORT_REVERSE = 1 << 2
 } git_sort_t;
 
 /**
  * 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 out pointer to the new revision walker
  * @param repo the repo to walk through
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_new(git_revwalk **out, 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.
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_reset(git_revwalk *walker);
 
 /**
  * Add a new root for the traversal
  *
  * The pushed commit will be marked as one of the roots from which to
  * start the walk. This commit may not be walked if it or a child is
  * hidden.
  *
  * At least one commit must be pushed onto the walker before a walk
  * can be started.
  *
  * The given id must belong to a committish on the walked
  * repository.
  *
  * @param walk the walker being used for the traversal.
  * @param id the oid of the commit to start from.
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_push(git_revwalk *walk, const git_oid *id);
 
 /**
  * Push matching references
  *
  * The OIDs pointed to by the references that match the given glob
  * pattern will be pushed to the revision walker.
  *
  * A leading 'refs/' is implied if not present as well as a trailing
  * '/\*' if the glob lacks '?', '\*' or '['.
  *
  * Any references matching this glob which do not point to a
  * committish will be ignored.
  *
  * @param walk the walker being used for the traversal
  * @param glob the glob pattern references should match
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_push_glob(git_revwalk *walk, const char *glob);
 
 /**
  * Push the repository's HEAD
  *
  * @param walk the walker being used for the traversal
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_push_head(git_revwalk *walk);
 
 /**
  * Mark a commit (and its ancestors) uninteresting for the output.
  *
  * The given id must belong to a committish 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 commit_id the oid of commit that will be ignored during the traversal
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_hide(git_revwalk *walk, const git_oid *commit_id);
 
 /**
  * Hide matching references.
  *
  * The OIDs pointed to by the references that match the given glob
  * pattern and their ancestors will be hidden from the output on the
  * revision walk.
  *
  * A leading 'refs/' is implied if not present as well as a trailing
  * '/\*' if the glob lacks '?', '\*' or '['.
  *
  * Any references matching this glob which do not point to a
  * committish will be ignored.
  *
  * @param walk the walker being used for the traversal
  * @param glob the glob pattern references should match
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_hide_glob(git_revwalk *walk, const char *glob);
 
 /**
  * Hide the repository's HEAD
  *
  * @param walk the walker being used for the traversal
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_hide_head(git_revwalk *walk);
 
 /**
  * Push the OID pointed to by a reference
  *
  * The reference must point to a committish.
  *
  * @param walk the walker being used for the traversal
  * @param refname the reference to push
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_push_ref(git_revwalk *walk, const char *refname);
 
 /**
  * Hide the OID pointed to by a reference
  *
  * The reference must point to a committish.
  *
  * @param walk the walker being used for the traversal
  * @param refname the reference to hide
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_hide_ref(git_revwalk *walk, const char *refname);
 
 /**
  * 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 out Pointer where to store the oid of the next commit
  * @param walk the walker to pop the commit from.
  * @return 0 if the next commit was found;
  *  GIT_ITEROVER if there are no commits left to iterate
  */
 GIT_EXTERN(int) git_revwalk_next(git_oid *out, 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
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_sorting(git_revwalk *walk, unsigned int sort_mode);
 
 /**
  * Push and hide the respective endpoints of the given range.
  *
  * The range should be of the form
  *   <commit>..<commit>
  * where each <commit> is in the form accepted by 'git_revparse_single'.
  * The left-hand commit will be hidden and the right-hand commit pushed.
  *
  * @param walk the walker being used for the traversal
  * @param range the range
  * @return 0 or an error code
  *
  */
 GIT_EXTERN(int) git_revwalk_push_range(git_revwalk *walk, const char *range);
 
 /**
  * Simplify the history by first-parent
  *
  * No parents other than the first for each commit will be enqueued.
  *
  * @param walk The revision walker.
  * @return 0 or an error code
  */
 GIT_EXTERN(int) git_revwalk_simplify_first_parent(git_revwalk *walk);
 
 
 /**
  * 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);
 
 /**
  * This is a callback function that user can provide to hide a
  * commit and its parents. If the callback function returns non-zero value,
  * then this commit and its parents will be hidden.
  *
  * @param commit_id oid of Commit
  * @param payload User-specified pointer to data to be passed as data payload
  * @return non-zero to hide the commmit and it parent.
  */
 typedef int GIT_CALLBACK(git_revwalk_hide_cb)(
     const git_oid *commit_id,
     void *payload);
 
 /**
  * Adds, changes or removes a callback function to hide a commit and its parents
  *
  * @param walk the revision walker
  * @param hide_cb  callback function to hide a commit and its parents
  * @param payload  data payload to be passed to callback function
  * @return 0 or an error code.
  */
 GIT_EXTERN(int) git_revwalk_add_hide_cb(
     git_revwalk *walk,
     git_revwalk_hide_cb hide_cb,
     void *payload);
 
 /** @} */
 GIT_END_DECL
 #endif

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