476 lines
14 KiB
C
476 lines
14 KiB
C
/*
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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_tree_h__
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#define INCLUDE_git_tree_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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#include "object.h"
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/**
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* @file git2/tree.h
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* @brief Git tree parsing, loading routines
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* @defgroup git_tree Git tree parsing, loading 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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* Lookup a tree object from the repository.
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*
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* @param out Pointer to the looked up tree
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* @param repo The repo to use when locating the tree.
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* @param id Identity of the tree to locate.
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_tree_lookup(
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git_tree **out, git_repository *repo, const git_oid *id);
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/**
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* Lookup a tree object from the repository,
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* given a prefix of its identifier (short id).
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*
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* @see git_object_lookup_prefix
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*
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* @param out pointer to the looked up tree
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* @param repo the repo to use when locating the tree.
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* @param id identity of the tree to locate.
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* @param len the length of the short identifier
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_tree_lookup_prefix(
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git_tree **out,
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git_repository *repo,
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const git_oid *id,
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size_t len);
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/**
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* Close an open tree
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*
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* You can no longer use the git_tree pointer after this call.
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*
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* IMPORTANT: You MUST call this method when you stop using a tree to
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* release memory. Failure to do so will cause a memory leak.
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*
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* @param tree The tree to close
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*/
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GIT_EXTERN(void) git_tree_free(git_tree *tree);
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/**
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* Get the id of a tree.
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*
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* @param tree a previously loaded tree.
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* @return object identity for the tree.
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*/
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GIT_EXTERN(const git_oid *) git_tree_id(const git_tree *tree);
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/**
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* Get the repository that contains the tree.
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*
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* @param tree A previously loaded tree.
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* @return Repository that contains this tree.
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*/
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GIT_EXTERN(git_repository *) git_tree_owner(const git_tree *tree);
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/**
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* Get the number of entries listed in a tree
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*
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* @param tree a previously loaded tree.
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* @return the number of entries in the tree
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*/
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GIT_EXTERN(size_t) git_tree_entrycount(const git_tree *tree);
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/**
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* Lookup a tree entry by its filename
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*
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* This returns a git_tree_entry that is owned by the git_tree. You don't
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* have to free it, but you must not use it after the git_tree is released.
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*
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* @param tree a previously loaded tree.
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* @param filename the filename of the desired entry
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* @return the tree entry; NULL if not found
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*/
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GIT_EXTERN(const git_tree_entry *) git_tree_entry_byname(
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const git_tree *tree, const char *filename);
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/**
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* Lookup a tree entry by its position in the tree
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*
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* This returns a git_tree_entry that is owned by the git_tree. You don't
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* have to free it, but you must not use it after the git_tree is released.
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*
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* @param tree a previously loaded tree.
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* @param idx the position in the entry list
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* @return the tree entry; NULL if not found
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*/
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GIT_EXTERN(const git_tree_entry *) git_tree_entry_byindex(
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const git_tree *tree, size_t idx);
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/**
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* Lookup a tree entry by SHA value.
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*
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* This returns a git_tree_entry that is owned by the git_tree. You don't
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* have to free it, but you must not use it after the git_tree is released.
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*
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* Warning: this must examine every entry in the tree, so it is not fast.
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*
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* @param tree a previously loaded tree.
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* @param id the sha being looked for
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* @return the tree entry; NULL if not found
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*/
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GIT_EXTERN(const git_tree_entry *) git_tree_entry_byid(
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const git_tree *tree, const git_oid *id);
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/**
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* Retrieve a tree entry contained in a tree or in any of its subtrees,
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* given its relative path.
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*
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* Unlike the other lookup functions, the returned tree entry is owned by
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* the user and must be freed explicitly with `git_tree_entry_free()`.
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*
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* @param out Pointer where to store the tree entry
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* @param root Previously loaded tree which is the root of the relative path
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* @param path Path to the contained entry
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* @return 0 on success; GIT_ENOTFOUND if the path does not exist
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*/
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GIT_EXTERN(int) git_tree_entry_bypath(
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git_tree_entry **out,
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const git_tree *root,
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const char *path);
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/**
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* Duplicate a tree entry
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*
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* Create a copy of a tree entry. The returned copy is owned by the user,
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* and must be freed explicitly with `git_tree_entry_free()`.
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*
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* @param dest pointer where to store the copy
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* @param source tree entry to duplicate
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_tree_entry_dup(git_tree_entry **dest, const git_tree_entry *source);
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/**
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* Free a user-owned tree entry
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*
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* IMPORTANT: This function is only needed for tree entries owned by the
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* user, such as the ones returned by `git_tree_entry_dup()` or
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* `git_tree_entry_bypath()`.
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*
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* @param entry The entry to free
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*/
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GIT_EXTERN(void) git_tree_entry_free(git_tree_entry *entry);
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/**
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* Get the filename of a tree entry
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*
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* @param entry a tree entry
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* @return the name of the file
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*/
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GIT_EXTERN(const char *) git_tree_entry_name(const git_tree_entry *entry);
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/**
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* Get the id of the object pointed by the entry
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*
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* @param entry a tree entry
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* @return the oid of the object
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*/
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GIT_EXTERN(const git_oid *) git_tree_entry_id(const git_tree_entry *entry);
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/**
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* Get the type of the object pointed by the entry
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*
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* @param entry a tree entry
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* @return the type of the pointed object
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*/
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GIT_EXTERN(git_object_t) git_tree_entry_type(const git_tree_entry *entry);
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/**
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* Get the UNIX file attributes of a tree entry
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*
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* @param entry a tree entry
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* @return filemode as an integer
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*/
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GIT_EXTERN(git_filemode_t) git_tree_entry_filemode(const git_tree_entry *entry);
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/**
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* Get the raw UNIX file attributes of a tree entry
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*
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* This function does not perform any normalization and is only useful
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* if you need to be able to recreate the original tree object.
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*
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* @param entry a tree entry
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* @return filemode as an integer
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*/
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GIT_EXTERN(git_filemode_t) git_tree_entry_filemode_raw(const git_tree_entry *entry);
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/**
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* Compare two tree entries
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*
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* @param e1 first tree entry
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* @param e2 second tree entry
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* @return <0 if e1 is before e2, 0 if e1 == e2, >0 if e1 is after e2
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*/
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GIT_EXTERN(int) git_tree_entry_cmp(const git_tree_entry *e1, const git_tree_entry *e2);
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/**
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* Convert a tree entry to the git_object it points to.
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*
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* You must call `git_object_free()` on the object when you are done with it.
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*
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* @param object_out pointer to the converted object
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* @param repo repository where to lookup the pointed object
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* @param entry a tree entry
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_tree_entry_to_object(
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git_object **object_out,
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git_repository *repo,
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const git_tree_entry *entry);
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/**
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* Create a new tree builder.
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*
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* The tree builder can be used to create or modify trees in memory and
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* write them as tree objects to the database.
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*
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* If the `source` parameter is not NULL, the tree builder will be
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* initialized with the entries of the given tree.
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*
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* If the `source` parameter is NULL, the tree builder will start with no
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* entries and will have to be filled manually.
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*
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* @param out Pointer where to store the tree builder
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* @param repo Repository in which to store the object
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* @param source Source tree to initialize the builder (optional)
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* @return 0 on success; error code otherwise
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*/
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GIT_EXTERN(int) git_treebuilder_new(
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git_treebuilder **out, git_repository *repo, const git_tree *source);
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/**
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* Clear all the entries in the builder
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*
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* @param bld Builder to clear
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* @return 0 on success; error code otherwise
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*/
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GIT_EXTERN(int) git_treebuilder_clear(git_treebuilder *bld);
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/**
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* Get the number of entries listed in a treebuilder
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*
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* @param bld a previously loaded treebuilder.
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* @return the number of entries in the treebuilder
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*/
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GIT_EXTERN(size_t) git_treebuilder_entrycount(git_treebuilder *bld);
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/**
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* Free a tree builder
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*
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* This will clear all the entries and free to builder.
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* Failing to free the builder after you're done using it
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* will result in a memory leak
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*
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* @param bld Builder to free
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*/
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GIT_EXTERN(void) git_treebuilder_free(git_treebuilder *bld);
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/**
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* Get an entry from the builder from its filename
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*
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* The returned entry is owned by the builder and should
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* not be freed manually.
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*
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* @param bld Tree builder
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* @param filename Name of the entry
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* @return pointer to the entry; NULL if not found
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*/
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GIT_EXTERN(const git_tree_entry *) git_treebuilder_get(
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git_treebuilder *bld, const char *filename);
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/**
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* Add or update an entry to the builder
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*
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* Insert a new entry for `filename` in the builder with the
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* given attributes.
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*
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* If an entry named `filename` already exists, its attributes
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* will be updated with the given ones.
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*
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* The optional pointer `out` can be used to retrieve a pointer to the
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* newly created/updated entry. Pass NULL if you do not need it. The
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* pointer may not be valid past the next operation in this
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* builder. Duplicate the entry if you want to keep it.
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*
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* By default the entry that you are inserting will be checked for
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* validity; that it exists in the object database and is of the
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* correct type. If you do not want this behavior, set the
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* `GIT_OPT_ENABLE_STRICT_OBJECT_CREATION` library option to false.
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*
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* @param out Pointer to store the entry (optional)
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* @param bld Tree builder
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* @param filename Filename of the entry
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* @param id SHA1 oid of the entry
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* @param filemode Folder attributes of the entry. This parameter must
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* be valued with one of the following entries: 0040000, 0100644,
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* 0100755, 0120000 or 0160000.
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_treebuilder_insert(
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const git_tree_entry **out,
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git_treebuilder *bld,
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const char *filename,
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const git_oid *id,
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git_filemode_t filemode);
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/**
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* Remove an entry from the builder by its filename
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*
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* @param bld Tree builder
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* @param filename Filename of the entry to remove
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_treebuilder_remove(
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git_treebuilder *bld, const char *filename);
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/**
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* Callback for git_treebuilder_filter
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*
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* The return value is treated as a boolean, with zero indicating that the
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* entry should be left alone and any non-zero value meaning that the
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* entry should be removed from the treebuilder list (i.e. filtered out).
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*/
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typedef int GIT_CALLBACK(git_treebuilder_filter_cb)(
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const git_tree_entry *entry, void *payload);
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/**
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* Selectively remove entries in the tree
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*
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* The `filter` callback will be called for each entry in the tree with a
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* pointer to the entry and the provided `payload`; if the callback returns
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* non-zero, the entry will be filtered (removed from the builder).
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*
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* @param bld Tree builder
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* @param filter Callback to filter entries
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* @param payload Extra data to pass to filter callback
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* @return 0 on success, non-zero callback return value, or error code
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*/
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GIT_EXTERN(int) git_treebuilder_filter(
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git_treebuilder *bld,
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git_treebuilder_filter_cb filter,
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void *payload);
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/**
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* Write the contents of the tree builder as a tree object
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*
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* The tree builder will be written to the given `repo`, and its
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* identifying SHA1 hash will be stored in the `id` pointer.
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*
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* @param id Pointer to store the OID of the newly written tree
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* @param bld Tree builder to write
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_treebuilder_write(
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git_oid *id, git_treebuilder *bld);
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/** Callback for the tree traversal method */
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typedef int GIT_CALLBACK(git_treewalk_cb)(
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const char *root, const git_tree_entry *entry, void *payload);
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/** Tree traversal modes */
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typedef enum {
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GIT_TREEWALK_PRE = 0, /* Pre-order */
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GIT_TREEWALK_POST = 1 /* Post-order */
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} git_treewalk_mode;
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/**
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* Traverse the entries in a tree and its subtrees in post or pre order.
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*
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* The entries will be traversed in the specified order, children subtrees
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* will be automatically loaded as required, and the `callback` will be
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* called once per entry with the current (relative) root for the entry and
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* the entry data itself.
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*
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* If the callback returns a positive value, the passed entry will be
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* skipped on the traversal (in pre mode). A negative value stops the walk.
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*
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* @param tree The tree to walk
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* @param mode Traversal mode (pre or post-order)
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* @param callback Function to call on each tree entry
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* @param payload Opaque pointer to be passed on each callback
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_tree_walk(
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const git_tree *tree,
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git_treewalk_mode mode,
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git_treewalk_cb callback,
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void *payload);
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/**
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* Create an in-memory copy of a tree. The copy must be explicitly
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* free'd or it will leak.
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*
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* @param out Pointer to store the copy of the tree
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* @param source Original tree to copy
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* @return 0
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*/
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GIT_EXTERN(int) git_tree_dup(git_tree **out, git_tree *source);
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/**
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* The kind of update to perform
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*/
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typedef enum {
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/** Update or insert an entry at the specified path */
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GIT_TREE_UPDATE_UPSERT,
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/** Remove an entry from the specified path */
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GIT_TREE_UPDATE_REMOVE
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} git_tree_update_t;
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/**
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* An action to perform during the update of a tree
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*/
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typedef struct {
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/** Update action. If it's an removal, only the path is looked at */
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git_tree_update_t action;
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/** The entry's id */
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git_oid id;
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/** The filemode/kind of object */
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git_filemode_t filemode;
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/** The full path from the root tree */
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const char *path;
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} git_tree_update;
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/**
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* Create a tree based on another one with the specified modifications
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*
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* Given the `baseline` perform the changes described in the list of
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* `updates` and create a new tree.
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*
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* This function is optimized for common file/directory addition, removal and
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* replacement in trees. It is much more efficient than reading the tree into a
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* `git_index` and modifying that, but in exchange it is not as flexible.
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*
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* Deleting and adding the same entry is undefined behaviour, changing
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* a tree to a blob or viceversa is not supported.
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*
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* @param out id of the new tree
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* @param repo the repository in which to create the tree, must be the
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* same as for `baseline`
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* @param baseline the tree to base these changes on
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* @param nupdates the number of elements in the update list
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* @param updates the list of updates to perform
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* @return 0 or an error code
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*/
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GIT_EXTERN(int) git_tree_create_updated(git_oid *out, git_repository *repo, git_tree *baseline, size_t nupdates, const git_tree_update *updates);
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/** @} */
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GIT_END_DECL
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#endif
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