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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_commit_h__
#define INCLUDE_git_commit_h__
#include "common.h"
#include "types.h"
#include "oid.h"
#include "object.h"
/**
* @file git2/commit.h
* @brief Git commit parsing, formatting routines
* @defgroup git_commit Git commit parsing, formatting routines
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/**
* Lookup a commit object from a repository.
*
* The returned object should be released with `git_commit_free` when no
* longer needed.
*
* @param commit pointer to the looked up commit
* @param repo the repo to use when locating the commit.
* @param id identity of the commit to locate. If the object is
* an annotated tag it will be peeled back to the commit.
* @return 0 or an error code
*/
GIT_EXTERN(int) git_commit_lookup(
git_commit **commit, git_repository *repo, const git_oid *id);
/**
* Lookup a commit object from a repository, given a prefix of its
* identifier (short id).
*
* The returned object should be released with `git_commit_free` when no
* longer needed.
*
* @see git_object_lookup_prefix
*
* @param commit pointer to the looked up commit
* @param repo the repo to use when locating the commit.
* @param id identity of the commit to locate. If the object is
* an annotated tag it will be peeled back to the commit.
* @param len the length of the short identifier
* @return 0 or an error code
*/
GIT_EXTERN(int) git_commit_lookup_prefix(
git_commit **commit, git_repository *repo, const git_oid *id, size_t len);
/**
* Close an open commit
*
* This is a wrapper around git_object_free()
*
* IMPORTANT:
* It *is* necessary to call this method when you stop
* using a commit. Failure to do so will cause a memory leak.
*
* @param commit the commit to close
*/
GIT_EXTERN(void) git_commit_free(git_commit *commit);
/**
* Get the id of a commit.
*
* @param commit a previously loaded commit.
* @return object identity for the commit.
*/
GIT_EXTERN(const git_oid *) git_commit_id(const git_commit *commit);
/**
* Get the repository that contains the commit.
*
* @param commit A previously loaded commit.
* @return Repository that contains this commit.
*/
GIT_EXTERN(git_repository *) git_commit_owner(const git_commit *commit);
/**
* Get the encoding for the message of a commit,
* as a string representing a standard encoding name.
*
* The encoding may be NULL if the `encoding` header
* in the commit is missing; in that case UTF-8 is assumed.
*
* @param commit a previously loaded commit.
* @return NULL, or the encoding
*/
GIT_EXTERN(const char *) git_commit_message_encoding(const git_commit *commit);
/**
* Get the full message of a commit.
*
* The returned message will be slightly prettified by removing any
* potential leading newlines.
*
* @param commit a previously loaded commit.
* @return the message of a commit
*/
GIT_EXTERN(const char *) git_commit_message(const git_commit *commit);
/**
* Get the full raw message of a commit.
*
* @param commit a previously loaded commit.
* @return the raw message of a commit
*/
GIT_EXTERN(const char *) git_commit_message_raw(const git_commit *commit);
/**
* Get the short "summary" of the git commit message.
*
* The returned message is the summary of the commit, comprising the
* first paragraph of the message with whitespace trimmed and squashed.
*
* @param commit a previously loaded commit.
* @return the summary of a commit or NULL on error
*/
GIT_EXTERN(const char *) git_commit_summary(git_commit *commit);
/**
* Get the long "body" of the git commit message.
*
* The returned message is the body of the commit, comprising
* everything but the first paragraph of the message. Leading and
* trailing whitespaces are trimmed.
*
* @param commit a previously loaded commit.
* @return the body of a commit or NULL when no the message only
* consists of a summary
*/
GIT_EXTERN(const char *) git_commit_body(git_commit *commit);
/**
* Get the commit time (i.e. committer time) of a commit.
*
* @param commit a previously loaded commit.
* @return the time of a commit
*/
GIT_EXTERN(git_time_t) git_commit_time(const git_commit *commit);
/**
* Get the commit timezone offset (i.e. committer's preferred timezone) of a commit.
*
* @param commit a previously loaded commit.
* @return positive or negative timezone offset, in minutes from UTC
*/
GIT_EXTERN(int) git_commit_time_offset(const git_commit *commit);
/**
* Get the committer of a commit.
*
* @param commit a previously loaded commit.
* @return the committer of a commit
*/
GIT_EXTERN(const git_signature *) git_commit_committer(const git_commit *commit);
/**
* Get the author of a commit.
*
* @param commit a previously loaded commit.
* @return the author of a commit
*/
GIT_EXTERN(const git_signature *) git_commit_author(const git_commit *commit);
/**
* Get the full raw text of the commit header.
*
* @param commit a previously loaded commit
* @return the header text of the commit
*/
GIT_EXTERN(const char *) git_commit_raw_header(const git_commit *commit);
/**
* Get the tree pointed to by a commit.
*
* @param tree_out pointer where to store the tree object
* @param commit a previously loaded commit.
* @return 0 or an error code
*/
GIT_EXTERN(int) git_commit_tree(git_tree **tree_out, const git_commit *commit);
/**
* Get the id of the tree pointed to by a commit. This differs from
* `git_commit_tree` in that no attempts are made to fetch an object
* from the ODB.
*
* @param commit a previously loaded commit.
* @return the id of tree pointed to by commit.
*/
GIT_EXTERN(const git_oid *) git_commit_tree_id(const git_commit *commit);
/**
* Get the number of parents of this commit
*
* @param commit a previously loaded commit.
* @return integer of count of parents
*/
GIT_EXTERN(unsigned int) git_commit_parentcount(const git_commit *commit);
/**
* Get the specified parent of the commit.
*
* @param out Pointer where to store the parent commit
* @param commit a previously loaded commit.
* @param n the position of the parent (from 0 to `parentcount`)
* @return 0 or an error code
*/
GIT_EXTERN(int) git_commit_parent(
git_commit **out,
const git_commit *commit,
unsigned int n);
/**
* Get the oid of a specified parent for a commit. This is different from
* `git_commit_parent`, which will attempt to load the parent commit from
* the ODB.
*
* @param commit a previously loaded commit.
* @param n the position of the parent (from 0 to `parentcount`)
* @return the id of the parent, NULL on error.
*/
GIT_EXTERN(const git_oid *) git_commit_parent_id(
const git_commit *commit,
unsigned int n);
/**
* Get the commit object that is the <n>th generation ancestor
* of the named commit object, following only the first parents.
* The returned commit has to be freed by the caller.
*
* Passing `0` as the generation number returns another instance of the
* base commit itself.
*
* @param ancestor Pointer where to store the ancestor commit
* @param commit a previously loaded commit.
* @param n the requested generation
* @return 0 on success; GIT_ENOTFOUND if no matching ancestor exists
* or an error code
*/
GIT_EXTERN(int) git_commit_nth_gen_ancestor(
git_commit **ancestor,
const git_commit *commit,
unsigned int n);
/**
* Get an arbitrary header field
*
* @param out the buffer to fill; existing content will be
* overwritten
* @param commit the commit to look in
* @param field the header field to return
* @return 0 on succeess, GIT_ENOTFOUND if the field does not exist,
* or an error code
*/
GIT_EXTERN(int) git_commit_header_field(git_buf *out, const git_commit *commit, const char *field);
/**
* Extract the signature from a commit
*
* If the id is not for a commit, the error class will be
* `GITERR_INVALID`. If the commit does not have a signature, the
* error class will be `GITERR_OBJECT`.
*
* @param signature the signature block; existing content will be
* overwritten
* @param signed_data signed data; this is the commit contents minus the signature block;
* existing content will be overwritten
* @param repo the repository in which the commit exists
* @param commit_id the commit from which to extract the data
* @param field the name of the header field containing the signature
* block; pass `NULL` to extract the default 'gpgsig'
* @return 0 on success, GIT_ENOTFOUND if the id is not for a commit
* or the commit does not have a signature.
*/
GIT_EXTERN(int) git_commit_extract_signature(git_buf *signature, git_buf *signed_data, git_repository *repo, git_oid *commit_id, const char *field);
/**
* Create new commit in the repository from a list of `git_object` pointers
*
* The message will **not** be cleaned up automatically. You can do that
* with the `git_message_prettify()` function.
*
* @param id Pointer in which to store the OID of the newly created commit
*
* @param repo Repository where to store the commit
*
* @param update_ref If not NULL, name of the reference that
* will be updated to point to this commit. If the reference
* is not direct, it will be resolved to a direct reference.
* Use "HEAD" to update the HEAD of the current branch and
* make it point to this commit. If the reference doesn't
* exist yet, it will be created. If it does exist, the first
* parent must be the tip of this branch.
*
* @param author Signature with author and author time of commit
*
* @param committer Signature with committer and * commit time of commit
*
* @param message_encoding The encoding for the message in the
* commit, represented with a standard encoding name.
* E.g. "UTF-8". If NULL, no encoding header is written and
* UTF-8 is assumed.
*
* @param message Full message for this commit
*
* @param tree An instance of a `git_tree` object that will
* be used as the tree for the commit. This tree object must
* also be owned by the given `repo`.
*
* @param parent_count Number of parents for this commit
*
* @param parents Array of `parent_count` pointers to `git_commit`
* objects that will be used as the parents for this commit. This
* array may be NULL if `parent_count` is 0 (root commit). All the
* given commits must be owned by the `repo`.
*
* @return 0 or an error code
* The created commit will be written to the Object Database and
* the given reference will be updated to point to it
*/
GIT_EXTERN(int) git_commit_create(
git_oid *id,
git_repository *repo,
const char *update_ref,
const git_signature *author,
const git_signature *committer,
const char *message_encoding,
const char *message,
const git_tree *tree,
size_t parent_count,
const git_commit *parents[]);
/**
* Create new commit in the repository using a variable argument list.
*
* The message will **not** be cleaned up automatically. You can do that
* with the `git_message_prettify()` function.
*
* The parents for the commit are specified as a variable list of pointers
* to `const git_commit *`. Note that this is a convenience method which may
* not be safe to export for certain languages or compilers
*
* All other parameters remain the same as `git_commit_create()`.
*
* @see git_commit_create
*/
GIT_EXTERN(int) git_commit_create_v(
git_oid *id,
git_repository *repo,
const char *update_ref,
const git_signature *author,
const git_signature *committer,
const char *message_encoding,
const char *message,
const git_tree *tree,
size_t parent_count,
...);
/**
* Amend an existing commit by replacing only non-NULL values.
*
* This creates a new commit that is exactly the same as the old commit,
* except that any non-NULL values will be updated. The new commit has
* the same parents as the old commit.
*
* The `update_ref` value works as in the regular `git_commit_create()`,
* updating the ref to point to the newly rewritten commit. If you want
* to amend a commit that is not currently the tip of the branch and then
* rewrite the following commits to reach a ref, pass this as NULL and
* update the rest of the commit chain and ref separately.
*
* Unlike `git_commit_create()`, the `author`, `committer`, `message`,
* `message_encoding`, and `tree` parameters can be NULL in which case this
* will use the values from the original `commit_to_amend`.
*
* All parameters have the same meanings as in `git_commit_create()`.
*
* @see git_commit_create
*/
GIT_EXTERN(int) git_commit_amend(
git_oid *id,
const git_commit *commit_to_amend,
const char *update_ref,
const git_signature *author,
const git_signature *committer,
const char *message_encoding,
const char *message,
const git_tree *tree);
/**
* Create a commit and write it into a buffer
*
* Create a commit as with `git_commit_create()` but instead of
* writing it to the objectdb, write the contents of the object into a
* buffer.
*
* @param out the buffer into which to write the commit object content
*
* @param repo Repository where the referenced tree and parents live
*
* @param author Signature with author and author time of commit
*
* @param committer Signature with committer and * commit time of commit
*
* @param message_encoding The encoding for the message in the
* commit, represented with a standard encoding name.
* E.g. "UTF-8". If NULL, no encoding header is written and
* UTF-8 is assumed.
*
* @param message Full message for this commit
*
* @param tree An instance of a `git_tree` object that will
* be used as the tree for the commit. This tree object must
* also be owned by the given `repo`.
*
* @param parent_count Number of parents for this commit
*
* @param parents Array of `parent_count` pointers to `git_commit`
* objects that will be used as the parents for this commit. This
* array may be NULL if `parent_count` is 0 (root commit). All the
* given commits must be owned by the `repo`.
*
* @return 0 or an error code
*/
GIT_EXTERN(int) git_commit_create_buffer(
git_buf *out,
git_repository *repo,
const git_signature *author,
const git_signature *committer,
const char *message_encoding,
const char *message,
const git_tree *tree,
size_t parent_count,
const git_commit *parents[]);
/**
* Create a commit object from the given buffer and signature
*
* Given the unsigned commit object's contents, its signature and the
* header field in which to store the signature, attach the signature
* to the commit and write it into the given repository.
*
* @param out the resulting commit id
* @param commit_content the content of the unsigned commit object
* @param signature the signature to add to the commit
* @param signature_field which header field should contain this
* signature. Leave `NULL` for the default of "gpgsig"
* @return 0 or an error code
*/
GIT_EXTERN(int) git_commit_create_with_signature(
git_oid *out,
git_repository *repo,
const char *commit_content,
const char *signature,
const char *signature_field);
/**
* Create an in-memory copy of a commit. The copy must be explicitly
* free'd or it will leak.
*
* @param out Pointer to store the copy of the commit
* @param source Original commit to copy
*/
GIT_EXTERN(int) git_commit_dup(git_commit **out, git_commit *source);
/** @} */
GIT_END_DECL
#endif
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