/*
* 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_git_tree_h__
#define INCLUDE_git_tree_h__
#include "common.h"
#include "types.h"
#include "oid.h"
#include "object.h"
/**
* @file git2/tree.h
* @brief Git tree parsing, loading routines
* @defgroup git_tree Git tree parsing, loading routines
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/**
* Lookup a tree object from the repository.
*
* @param tree pointer to the looked up tree
* @param repo the repo to use when locating the tree.
* @param id identity of the tree to locate.
* @return 0 or an error code
*/
GIT_INLINE(int) git_tree_lookup(git_tree **tree, git_repository *repo, const git_oid *id)
{
return git_object_lookup((git_object **)tree, repo, id, GIT_OBJ_TREE);
}
/**
* Lookup a tree object from the repository,
* given a prefix of its identifier (short id).
*
* @see git_object_lookup_prefix
*
* @param tree pointer to the looked up tree
* @param repo the repo to use when locating the tree.
* @param id identity of the tree to locate.
* @param len the length of the short identifier
* @return 0 or an error code
*/
GIT_INLINE(int) git_tree_lookup_prefix(
git_tree **tree,
git_repository *repo,
const git_oid *id,
size_t len)
{
return git_object_lookup_prefix((git_object **)tree, repo, id, len, GIT_OBJ_TREE);
}
/**
* Close an open tree
*
* This is a wrapper around git_object_free()
*
* IMPORTANT:
* It *is* necessary to call this method when you stop
* using a tree. Failure to do so will cause a memory leak.
*
* @param tree the tree to close
*/
GIT_INLINE(void) git_tree_free(git_tree *tree)
{
git_object_free((git_object *) tree);
}
/**
* Free a tree entry
*
* IMPORTANT: This function is only needed for tree
* entries owned by the user, such as the ones returned
* by `git_tree_entry_dup`.
*
* @param entry The entry to free
*/
GIT_EXTERN(void) git_tree_entry_free(git_tree_entry *entry);
/**
* Duplicate a tree entry
*
* Create a copy of a tree entry. The returned copy is owned
* by the user, and must be freed manually with
* `git_tree_entry_free`.
*
* @param entry A tree entry to duplicate
* @return a copy of the original entry
*/
GIT_EXTERN(git_tree_entry *) git_tree_entry_dup(const git_tree_entry *entry);
/**
* Get the id of a tree.
*
* @param tree a previously loaded tree.
* @return object identity for the tree.
*/
GIT_EXTERN(const git_oid *) git_tree_id(const git_tree *tree);
/**
* Get the number of entries listed in a tree
*
* @param tree a previously loaded tree.
* @return the number of entries in the tree
*/
GIT_EXTERN(unsigned int) git_tree_entrycount(const git_tree *tree);
/**
* Lookup a tree entry by its filename
*
* @param tree a previously loaded tree.
* @param filename the filename of the desired entry
* @return the tree entry; NULL if not found
*/
GIT_EXTERN(const git_tree_entry *) git_tree_entry_byname(git_tree *tree, const char *filename);
/**
* Lookup a tree entry by its position in the tree
*
* @param tree a previously loaded tree.
* @param idx the position in the entry list
* @return the tree entry; NULL if not found
*/
GIT_EXTERN(const git_tree_entry *) git_tree_entry_byindex(git_tree *tree, size_t idx);
/**
* Lookup a tree entry by SHA value.
*
* Warning: this must examine every entry in the tree, so it is not fast.
*
* @param tree a previously loaded tree.
* @param oid the sha being looked for
* @return the tree entry; NULL if not found
*/
GIT_EXTERN(const git_tree_entry *) git_tree_entry_byoid(git_tree *tree, const git_oid *oid);
/**
* Get the UNIX file attributes of a tree entry
*
* @param entry a tree entry
* @return filemode as an integer
*/
GIT_EXTERN(git_filemode_t) git_tree_entry_filemode(const git_tree_entry *entry);
/**
* Get the filename of a tree entry
*
* @param entry a tree entry
* @return the name of the file
*/
GIT_EXTERN(const char *) git_tree_entry_name(const git_tree_entry *entry);
/**
* Get the id of the object pointed by the entry
*
* @param entry a tree entry
* @return the oid of the object
*/
GIT_EXTERN(const git_oid *) git_tree_entry_id(const git_tree_entry *entry);
/**
* Get the type of the object pointed by the entry
*
* @param entry a tree entry
* @return the type of the pointed object
*/
GIT_EXTERN(git_otype) git_tree_entry_type(const git_tree_entry *entry);
/**
* Convert a tree entry to the git_object it points too.
*
* @param object pointer to the converted object
* @param repo repository where to lookup the pointed object
* @param entry a tree entry
* @return 0 or an error code
*/
GIT_EXTERN(int) git_tree_entry_to_object(
git_object **object_out,
git_repository *repo,
const git_tree_entry *entry);
/**
* Create a new tree builder.
*
* The tree builder can be used to create or modify
* trees in memory and write them as tree objects to the
* database.
*
* If the `source` parameter is not NULL, the tree builder
* will be initialized with the entries of the given tree.
*
* If the `source` parameter is NULL, the tree builder will
* have no entries and will have to be filled manually.
*
* @param builder_p Pointer where to store the tree builder
* @param source Source tree to initialize the builder (optional)
* @return 0 on success; error code otherwise
*/
GIT_EXTERN(int) git_treebuilder_create(git_treebuilder **builder_p, const git_tree *source);
/**
* Clear all the entires in the builder
*
* @param bld Builder to clear
*/
GIT_EXTERN(void) git_treebuilder_clear(git_treebuilder *bld);
/**
* Free a tree builder
*
* This will clear all the entries and free to builder.
* Failing to free the builder after you're done using it
* will result in a memory leak
*
* @param bld Builder to free
*/
GIT_EXTERN(void) git_treebuilder_free(git_treebuilder *bld);
/**
* Get an entry from the builder from its filename
*
* The returned entry is owned by the builder and should
* not be freed manually.
*
* @param bld Tree builder
* @param filename Name of the entry
* @return pointer to the entry; NULL if not found
*/
GIT_EXTERN(const git_tree_entry *) git_treebuilder_get(git_treebuilder *bld, const char *filename);
/**
* Add or update an entry to the builder
*
* Insert a new entry for `filename` in the builder with the
* given attributes.
*
* if an entry named `filename` already exists, its attributes
* will be updated with the given ones.
*
* The optional pointer `entry_out` can be used to retrieve a
* pointer to the newly created/updated entry.
*
* No attempt is being made to ensure that the provided oid points
* to an existing git object in the object database, nor that the
* attributes make sense regarding the type of the pointed at object.
*
* @param entry_out Pointer to store the entry (optional)
* @param bld Tree builder
* @param filename Filename of the entry
* @param id SHA1 oid of the entry
* @param filemode Folder attributes of the entry. This parameter must
* be valued with one of the following entries: 0040000, 0100644,
* 0100755, 0120000 or 0160000.
* @return 0 or an error code
*/
GIT_EXTERN(int) git_treebuilder_insert(
const git_tree_entry **entry_out,
git_treebuilder *bld,
const char *filename,
const git_oid *id,
git_filemode_t filemode);
/**
* Remove an entry from the builder by its filename
*
* @param bld Tree builder
* @param filename Filename of the entry to remove
*/
GIT_EXTERN(int) git_treebuilder_remove(git_treebuilder *bld, const char *filename);
/**
* Filter the entries in the tree
*
* The `filter` callback will be called for each entry
* in the tree with a pointer to the entry and the
* provided `payload`: if the callback returns 1, the
* entry will be filtered (removed from the builder).
*
* @param bld Tree builder
* @param filter Callback to filter entries
*/
GIT_EXTERN(void) git_treebuilder_filter(
git_treebuilder *bld,
int (*filter)(const git_tree_entry *, void *),
void *payload);
/**
* Write the contents of the tree builder as a tree object
*
* The tree builder will be written to the given `repo`, and
* it's identifying SHA1 hash will be stored in the `oid`
* pointer.
*
* @param oid Pointer where to store the written OID
* @param repo Repository where to store the object
* @param bld Tree builder to write
* @return 0 or an error code
*/
GIT_EXTERN(int) git_treebuilder_write(git_oid *oid, git_repository *repo, git_treebuilder *bld);
/**
* Retrieve a tree entry contained in a tree or in any
* of its subtrees, given its relative path.
*
* The returned tree entry is owned by the user and must
* be freed manually with `git_tree_entry_free`.
*
* @param entry Pointer where to store the tree entry
* @param root A previously loaded tree which will be the root of the relative path
* @param subtree_path Path to the contained entry
* @return 0 on success; GIT_ENOTFOUND if the path does not exist
*/
GIT_EXTERN(int) git_tree_entry_bypath(
git_tree_entry **entry,
git_tree *root,
const char *path);
/** Callback for the tree traversal method */
typedef int (*git_treewalk_cb)(const char *root, const git_tree_entry *entry, void *payload);
/** Tree traversal modes */
enum git_treewalk_mode {
GIT_TREEWALK_PRE = 0, /* Pre-order */
GIT_TREEWALK_POST = 1, /* Post-order */
};
/**
* Traverse the entries in a tree and its subtrees in
* post or pre order
*
* The entries will be traversed in the specified order,
* children subtrees will be automatically loaded as required,
* and the `callback` will be called once per entry with
* the current (relative) root for the entry and the entry
* data itself.
*
* If the callback returns a positive value, the passed entry will be
* skipped on the traversal (in pre mode). A negative value stops the
* walk.
*
* @param tree The tree to walk
* @param callback Function to call on each tree entry
* @param mode Traversal mode (pre or post-order)
* @param payload Opaque pointer to be passed on each callback
* @return 0 or an error code
*/
GIT_EXTERN(int) git_tree_walk(git_tree *tree, git_treewalk_cb callback, int mode, void *payload);
/** @} */
GIT_END_DECL
#endif
