303 lines
8.7 KiB
C
303 lines
8.7 KiB
C
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/*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#ifndef INCLUDE_git_revwalk_h__
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#define INCLUDE_git_revwalk_h__
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#include "common.h"
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#include "types.h"
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#include "oid.h"
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/**
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* @file git2/revwalk.h
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* @brief Git revision traversal routines
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* @defgroup git_revwalk Git revision traversal routines
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* @ingroup Git
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* @{
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*/
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GIT_BEGIN_DECL
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/**
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* Flags to specify the sorting which a revwalk should perform.
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*/
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typedef enum {
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/**
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* Sort the output with the same default method from `git`: reverse
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* chronological order. This is the default sorting for new walkers.
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*/
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GIT_SORT_NONE = 0,
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/**
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* Sort the repository contents in topological order (no parents before
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* all of its children are shown); this sorting mode can be combined
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* with time sorting to produce `git`'s `--date-order``.
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*/
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GIT_SORT_TOPOLOGICAL = 1 << 0,
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/**
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* Sort the repository contents by commit time;
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* this sorting mode can be combined with
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* topological sorting.
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*/
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GIT_SORT_TIME = 1 << 1,
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/**
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* Iterate through the repository contents in reverse
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* order; this sorting mode can be combined with
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* any of the above.
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*/
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GIT_SORT_REVERSE = 1 << 2
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} git_sort_t;
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/**
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* Allocate a new revision walker to iterate through a repo.
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*
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* This revision walker uses a custom memory pool and an internal
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* commit cache, so it is relatively expensive to allocate.
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*
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* For maximum performance, this revision walker should be
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* reused for different walks.
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*
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* This revision walker is *not* thread safe: it may only be
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* used to walk a repository on a single thread; however,
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* it is possible to have several revision walkers in
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* several different threads walking the same repository.
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*
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* @param out pointer to the new revision walker
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* @param repo the repo to walk through
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_new(git_revwalk **out, git_repository *repo);
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/**
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* Reset the revision walker for reuse.
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*
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* This will clear all the pushed and hidden commits, and
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* leave the walker in a blank state (just like at
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* creation) ready to receive new commit pushes and
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* start a new walk.
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*
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* The revision walk is automatically reset when a walk
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* is over.
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*
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* @param walker handle to reset.
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_reset(git_revwalk *walker);
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/**
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* Add a new root for the traversal
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*
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* The pushed commit will be marked as one of the roots from which to
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* start the walk. This commit may not be walked if it or a child is
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* hidden.
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*
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* At least one commit must be pushed onto the walker before a walk
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* can be started.
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*
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* The given id must belong to a committish on the walked
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* repository.
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*
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* @param walk the walker being used for the traversal.
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* @param id the oid of the commit to start from.
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_push(git_revwalk *walk, const git_oid *id);
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/**
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* Push matching references
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*
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* The OIDs pointed to by the references that match the given glob
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* pattern will be pushed to the revision walker.
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*
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* A leading 'refs/' is implied if not present as well as a trailing
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* '/\*' if the glob lacks '?', '\*' or '['.
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*
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* Any references matching this glob which do not point to a
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* committish will be ignored.
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*
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* @param walk the walker being used for the traversal
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* @param glob the glob pattern references should match
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_push_glob(git_revwalk *walk, const char *glob);
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/**
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* Push the repository's HEAD
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*
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* @param walk the walker being used for the traversal
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_push_head(git_revwalk *walk);
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/**
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* Mark a commit (and its ancestors) uninteresting for the output.
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*
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* The given id must belong to a committish on the walked
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* repository.
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*
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* The resolved commit and all its parents will be hidden from the
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* output on the revision walk.
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*
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* @param walk the walker being used for the traversal.
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* @param commit_id the oid of commit that will be ignored during the traversal
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_hide(git_revwalk *walk, const git_oid *commit_id);
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/**
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* Hide matching references.
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*
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* The OIDs pointed to by the references that match the given glob
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* pattern and their ancestors will be hidden from the output on the
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* revision walk.
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*
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* A leading 'refs/' is implied if not present as well as a trailing
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* '/\*' if the glob lacks '?', '\*' or '['.
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*
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* Any references matching this glob which do not point to a
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* committish will be ignored.
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*
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* @param walk the walker being used for the traversal
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* @param glob the glob pattern references should match
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_hide_glob(git_revwalk *walk, const char *glob);
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/**
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* Hide the repository's HEAD
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*
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* @param walk the walker being used for the traversal
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_hide_head(git_revwalk *walk);
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/**
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* Push the OID pointed to by a reference
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*
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* The reference must point to a committish.
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*
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* @param walk the walker being used for the traversal
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* @param refname the reference to push
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_push_ref(git_revwalk *walk, const char *refname);
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/**
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* Hide the OID pointed to by a reference
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*
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* The reference must point to a committish.
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*
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* @param walk the walker being used for the traversal
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* @param refname the reference to hide
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_hide_ref(git_revwalk *walk, const char *refname);
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/**
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* Get the next commit from the revision walk.
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*
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* The initial call to this method is *not* blocking when
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* iterating through a repo with a time-sorting mode.
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*
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* Iterating with Topological or inverted modes makes the initial
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* call blocking to preprocess the commit list, but this block should be
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* mostly unnoticeable on most repositories (topological preprocessing
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* times at 0.3s on the git.git repo).
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*
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* The revision walker is reset when the walk is over.
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*
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* @param out Pointer where to store the oid of the next commit
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* @param walk the walker to pop the commit from.
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* @return 0 if the next commit was found;
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* GIT_ITEROVER if there are no commits left to iterate
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*/
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GIT_EXTERN(int) git_revwalk_next(git_oid *out, git_revwalk *walk);
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/**
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* Change the sorting mode when iterating through the
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* repository's contents.
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*
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* Changing the sorting mode resets the walker.
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*
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* @param walk the walker being used for the traversal.
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* @param sort_mode combination of GIT_SORT_XXX flags
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_sorting(git_revwalk *walk, unsigned int sort_mode);
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/**
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* Push and hide the respective endpoints of the given range.
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*
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* The range should be of the form
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* <commit>..<commit>
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* where each <commit> is in the form accepted by 'git_revparse_single'.
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* The left-hand commit will be hidden and the right-hand commit pushed.
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*
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* @param walk the walker being used for the traversal
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* @param range the range
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* @return 0 or an error code
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*
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*/
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GIT_EXTERN(int) git_revwalk_push_range(git_revwalk *walk, const char *range);
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/**
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* Simplify the history by first-parent
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*
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* No parents other than the first for each commit will be enqueued.
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*
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* @param walk The revision walker.
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_revwalk_simplify_first_parent(git_revwalk *walk);
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/**
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* Free a revision walker previously allocated.
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*
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* @param walk traversal handle to close. If NULL nothing occurs.
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*/
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GIT_EXTERN(void) git_revwalk_free(git_revwalk *walk);
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/**
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* Return the repository on which this walker
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* is operating.
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*
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* @param walk the revision walker
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* @return the repository being walked
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*/
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GIT_EXTERN(git_repository *) git_revwalk_repository(git_revwalk *walk);
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/**
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* This is a callback function that user can provide to hide a
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* commit and its parents. If the callback function returns non-zero value,
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* then this commit and its parents will be hidden.
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*
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* @param commit_id oid of Commit
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* @param payload User-specified pointer to data to be passed as data payload
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* @return non-zero to hide the commmit and it parent.
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*/
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typedef int GIT_CALLBACK(git_revwalk_hide_cb)(
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const git_oid *commit_id,
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void *payload);
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/**
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* Adds, changes or removes a callback function to hide a commit and its parents
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*
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* @param walk the revision walker
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* @param hide_cb callback function to hide a commit and its parents
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* @param payload data payload to be passed to callback function
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* @return 0 or an error code.
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*/
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GIT_EXTERN(int) git_revwalk_add_hide_cb(
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git_revwalk *walk,
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git_revwalk_hide_cb hide_cb,
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void *payload);
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/** @} */
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GIT_END_DECL
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#endif
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