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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_refs_h__
+#define INCLUDE_git_refs_h__
+
+#include "common.h"
+#include "types.h"
+#include "oid.h"
+#include "strarray.h"
+
+/**
+ * @file git2/refs.h
+ * @brief Git reference management routines
+ * @defgroup git_reference Git reference management routines
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/**
+ * Lookup a reference by name in a repository.
+ *
+ * The returned reference must be freed by the user.
+ *
+ * The name will be checked for validity.
+ * See `git_reference_symbolic_create()` for rules about valid names.
+ *
+ * @param out pointer to the looked-up reference
+ * @param repo the repository to look up the reference
+ * @param name the long name for the reference (e.g. HEAD, refs/heads/master, refs/tags/v0.1.0, ...)
+ * @return 0 on success, GIT_ENOTFOUND, GIT_EINVALIDSPEC or an error code.
+ */
+GIT_EXTERN(int) git_reference_lookup(git_reference **out, git_repository *repo, const char *name);
+
+/**
+ * Lookup a reference by name and resolve immediately to OID.
+ *
+ * This function provides a quick way to resolve a reference name straight
+ * through to the object id that it refers to. This avoids having to
+ * allocate or free any `git_reference` objects for simple situations.
+ *
+ * The name will be checked for validity.
+ * See `git_reference_symbolic_create()` for rules about valid names.
+ *
+ * @param out Pointer to oid to be filled in
+ * @param repo The repository in which to look up the reference
+ * @param name The long name for the reference (e.g. HEAD, refs/heads/master, refs/tags/v0.1.0, ...)
+ * @return 0 on success, GIT_ENOTFOUND, GIT_EINVALIDSPEC or an error code.
+ */
+GIT_EXTERN(int) git_reference_name_to_id(
+ git_oid *out, git_repository *repo, const char *name);
+
+/**
+ * Lookup a reference by DWIMing its short name
+ *
+ * Apply the git precedence rules to the given shorthand to determine
+ * which reference the user is referring to.
+ *
+ * @param out pointer in which to store the reference
+ * @param repo the repository in which to look
+ * @param shorthand the short name for the reference
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_dwim(git_reference **out, git_repository *repo, const char *shorthand);
+
+/**
+ * Conditionally create a new symbolic reference.
+ *
+ * A symbolic reference is a reference name that refers to another
+ * reference name. If the other name moves, the symbolic name will move,
+ * too. As a simple example, the "HEAD" reference might refer to
+ * "refs/heads/master" while on the "master" branch of a repository.
+ *
+ * The symbolic reference will be created in the repository and written to
+ * the disk. The generated reference object must be freed by the user.
+ *
+ * Valid reference names must follow one of two patterns:
+ *
+ * 1. Top-level names must contain only capital letters and underscores,
+ * and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
+ * 2. Names prefixed with "refs/" can be almost anything. You must avoid
+ * the characters '~', '^', ':', '\\', '?', '[', and '*', and the
+ * sequences ".." and "@{" which have special meaning to revparse.
+ *
+ * This function will return an error if a reference already exists with the
+ * given name unless `force` is true, in which case it will be overwritten.
+ *
+ * The message for the reflog will be ignored if the reference does
+ * not belong in the standard set (HEAD, branches and remote-tracking
+ * branches) and it does not have a reflog.
+ *
+ * It will return GIT_EMODIFIED if the reference's value at the time
+ * of updating does not match the one passed through `current_value`
+ * (i.e. if the ref has changed since the user read it).
+ *
+ * If `current_value` is all zeros, this function will return GIT_EMODIFIED
+ * if the ref already exists.
+ *
+ * @param out Pointer to the newly created reference
+ * @param repo Repository where that reference will live
+ * @param name The name of the reference
+ * @param target The target of the reference
+ * @param force Overwrite existing references
+ * @param current_value The expected value of the reference when updating
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EEXISTS, GIT_EINVALIDSPEC, GIT_EMODIFIED or an error code
+ */
+GIT_EXTERN(int) git_reference_symbolic_create_matching(git_reference **out, git_repository *repo, const char *name, const char *target, int force, const char *current_value, const char *log_message);
+
+/**
+ * Create a new symbolic reference.
+ *
+ * A symbolic reference is a reference name that refers to another
+ * reference name. If the other name moves, the symbolic name will move,
+ * too. As a simple example, the "HEAD" reference might refer to
+ * "refs/heads/master" while on the "master" branch of a repository.
+ *
+ * The symbolic reference will be created in the repository and written to
+ * the disk. The generated reference object must be freed by the user.
+ *
+ * Valid reference names must follow one of two patterns:
+ *
+ * 1. Top-level names must contain only capital letters and underscores,
+ * and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
+ * 2. Names prefixed with "refs/" can be almost anything. You must avoid
+ * the characters '~', '^', ':', '\\', '?', '[', and '*', and the
+ * sequences ".." and "@{" which have special meaning to revparse.
+ *
+ * This function will return an error if a reference already exists with the
+ * given name unless `force` is true, in which case it will be overwritten.
+ *
+ * The message for the reflog will be ignored if the reference does
+ * not belong in the standard set (HEAD, branches and remote-tracking
+ * branches) and it does not have a reflog.
+ *
+ * @param out Pointer to the newly created reference
+ * @param repo Repository where that reference will live
+ * @param name The name of the reference
+ * @param target The target of the reference
+ * @param force Overwrite existing references
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EEXISTS, GIT_EINVALIDSPEC or an error code
+ */
+GIT_EXTERN(int) git_reference_symbolic_create(git_reference **out, git_repository *repo, const char *name, const char *target, int force, const char *log_message);
+
+/**
+ * Create a new direct reference.
+ *
+ * A direct reference (also called an object id reference) refers directly
+ * to a specific object id (a.k.a. OID or SHA) in the repository. The id
+ * permanently refers to the object (although the reference itself can be
+ * moved). For example, in libgit2 the direct ref "refs/tags/v0.17.0"
+ * refers to OID 5b9fac39d8a76b9139667c26a63e6b3f204b3977.
+ *
+ * The direct reference will be created in the repository and written to
+ * the disk. The generated reference object must be freed by the user.
+ *
+ * Valid reference names must follow one of two patterns:
+ *
+ * 1. Top-level names must contain only capital letters and underscores,
+ * and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
+ * 2. Names prefixed with "refs/" can be almost anything. You must avoid
+ * the characters '~', '^', ':', '\\', '?', '[', and '*', and the
+ * sequences ".." and "@{" which have special meaning to revparse.
+ *
+ * This function will return an error if a reference already exists with the
+ * given name unless `force` is true, in which case it will be overwritten.
+ *
+ * The message for the reflog will be ignored if the reference does
+ * not belong in the standard set (HEAD, branches and remote-tracking
+ * branches) and it does not have a reflog.
+ *
+ * @param out Pointer to the newly created reference
+ * @param repo Repository where that reference will live
+ * @param name The name of the reference
+ * @param id The object id pointed to by the reference.
+ * @param force Overwrite existing references
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EEXISTS, GIT_EINVALIDSPEC or an error code
+ */
+GIT_EXTERN(int) git_reference_create(git_reference **out, git_repository *repo, const char *name, const git_oid *id, int force, const char *log_message);
+
+/**
+ * Conditionally create new direct reference
+ *
+ * A direct reference (also called an object id reference) refers directly
+ * to a specific object id (a.k.a. OID or SHA) in the repository. The id
+ * permanently refers to the object (although the reference itself can be
+ * moved). For example, in libgit2 the direct ref "refs/tags/v0.17.0"
+ * refers to OID 5b9fac39d8a76b9139667c26a63e6b3f204b3977.
+ *
+ * The direct reference will be created in the repository and written to
+ * the disk. The generated reference object must be freed by the user.
+ *
+ * Valid reference names must follow one of two patterns:
+ *
+ * 1. Top-level names must contain only capital letters and underscores,
+ * and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
+ * 2. Names prefixed with "refs/" can be almost anything. You must avoid
+ * the characters '~', '^', ':', '\\', '?', '[', and '*', and the
+ * sequences ".." and "@{" which have special meaning to revparse.
+ *
+ * This function will return an error if a reference already exists with the
+ * given name unless `force` is true, in which case it will be overwritten.
+ *
+ * The message for the reflog will be ignored if the reference does
+ * not belong in the standard set (HEAD, branches and remote-tracking
+ * branches) and it does not have a reflog.
+ *
+ * It will return GIT_EMODIFIED if the reference's value at the time
+ * of updating does not match the one passed through `current_id`
+ * (i.e. if the ref has changed since the user read it).
+ *
+ * @param out Pointer to the newly created reference
+ * @param repo Repository where that reference will live
+ * @param name The name of the reference
+ * @param id The object id pointed to by the reference.
+ * @param force Overwrite existing references
+ * @param current_id The expected value of the reference at the time of update
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EMODIFIED if the value of the reference
+ * has changed, GIT_EEXISTS, GIT_EINVALIDSPEC or an error code
+ */
+GIT_EXTERN(int) git_reference_create_matching(git_reference **out, git_repository *repo, const char *name, const git_oid *id, int force, const git_oid *current_id, const char *log_message);
+
+/**
+ * Get the OID pointed to by a direct reference.
+ *
+ * Only available if the reference is direct (i.e. an object id reference,
+ * not a symbolic one).
+ *
+ * To find the OID of a symbolic ref, call `git_reference_resolve()` and
+ * then this function (or maybe use `git_reference_name_to_id()` to
+ * directly resolve a reference name all the way through to an OID).
+ *
+ * @param ref The reference
+ * @return a pointer to the oid if available, NULL otherwise
+ */
+GIT_EXTERN(const git_oid *) git_reference_target(const git_reference *ref);
+
+/**
+ * Return the peeled OID target of this reference.
+ *
+ * This peeled OID only applies to direct references that point to
+ * a hard Tag object: it is the result of peeling such Tag.
+ *
+ * @param ref The reference
+ * @return a pointer to the oid if available, NULL otherwise
+ */
+GIT_EXTERN(const git_oid *) git_reference_target_peel(const git_reference *ref);
+
+/**
+ * Get full name to the reference pointed to by a symbolic reference.
+ *
+ * Only available if the reference is symbolic.
+ *
+ * @param ref The reference
+ * @return a pointer to the name if available, NULL otherwise
+ */
+GIT_EXTERN(const char *) git_reference_symbolic_target(const git_reference *ref);
+
+/**
+ * Get the type of a reference.
+ *
+ * Either direct (GIT_REFERENCE_DIRECT) or symbolic (GIT_REFERENCE_SYMBOLIC)
+ *
+ * @param ref The reference
+ * @return the type
+ */
+GIT_EXTERN(git_reference_t) git_reference_type(const git_reference *ref);
+
+/**
+ * Get the full name of a reference.
+ *
+ * See `git_reference_symbolic_create()` for rules about valid names.
+ *
+ * @param ref The reference
+ * @return the full name for the ref
+ */
+GIT_EXTERN(const char *) git_reference_name(const git_reference *ref);
+
+/**
+ * Resolve a symbolic reference to a direct reference.
+ *
+ * This method iteratively peels a symbolic reference until it resolves to
+ * a direct reference to an OID.
+ *
+ * The peeled reference is returned in the `resolved_ref` argument, and
+ * must be freed manually once it's no longer needed.
+ *
+ * If a direct reference is passed as an argument, a copy of that
+ * reference is returned. This copy must be manually freed too.
+ *
+ * @param out Pointer to the peeled reference
+ * @param ref The reference
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_resolve(git_reference **out, const git_reference *ref);
+
+/**
+ * Get the repository where a reference resides.
+ *
+ * @param ref The reference
+ * @return a pointer to the repo
+ */
+GIT_EXTERN(git_repository *) git_reference_owner(const git_reference *ref);
+
+/**
+ * Create a new reference with the same name as the given reference but a
+ * different symbolic target. The reference must be a symbolic reference,
+ * otherwise this will fail.
+ *
+ * The new reference will be written to disk, overwriting the given reference.
+ *
+ * The target name will be checked for validity.
+ * See `git_reference_symbolic_create()` for rules about valid names.
+ *
+ * The message for the reflog will be ignored if the reference does
+ * not belong in the standard set (HEAD, branches and remote-tracking
+ * branches) and it does not have a reflog.
+ *
+ * @param out Pointer to the newly created reference
+ * @param ref The reference
+ * @param target The new target for the reference
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EINVALIDSPEC or an error code
+ */
+GIT_EXTERN(int) git_reference_symbolic_set_target(
+ git_reference **out,
+ git_reference *ref,
+ const char *target,
+ const char *log_message);
+
+/**
+ * Conditionally create a new reference with the same name as the given reference but a
+ * different OID target. The reference must be a direct reference, otherwise
+ * this will fail.
+ *
+ * The new reference will be written to disk, overwriting the given reference.
+ *
+ * @param out Pointer to the newly created reference
+ * @param ref The reference
+ * @param id The new target OID for the reference
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EMODIFIED if the value of the reference
+ * has changed since it was read, or an error code
+ */
+GIT_EXTERN(int) git_reference_set_target(
+ git_reference **out,
+ git_reference *ref,
+ const git_oid *id,
+ const char *log_message);
+
+/**
+ * Rename an existing reference.
+ *
+ * This method works for both direct and symbolic references.
+ *
+ * The new name will be checked for validity.
+ * See `git_reference_symbolic_create()` for rules about valid names.
+ *
+ * If the `force` flag is not enabled, and there's already
+ * a reference with the given name, the renaming will fail.
+ *
+ * IMPORTANT:
+ * The user needs to write a proper reflog entry if the
+ * reflog is enabled for the repository. We only rename
+ * the reflog if it exists.
+ *
+ * @param ref The reference to rename
+ * @param new_name The new name for the reference
+ * @param force Overwrite an existing reference
+ * @param log_message The one line long message to be appended to the reflog
+ * @return 0 on success, GIT_EINVALIDSPEC, GIT_EEXISTS or an error code
+ *
+ */
+GIT_EXTERN(int) git_reference_rename(
+ git_reference **new_ref,
+ git_reference *ref,
+ const char *new_name,
+ int force,
+ const char *log_message);
+
+/**
+ * Delete an existing reference.
+ *
+ * This method works for both direct and symbolic references. The reference
+ * will be immediately removed on disk but the memory will not be freed.
+ * Callers must call `git_reference_free`.
+ *
+ * This function will return an error if the reference has changed
+ * from the time it was looked up.
+ *
+ * @param ref The reference to remove
+ * @return 0, GIT_EMODIFIED or an error code
+ */
+GIT_EXTERN(int) git_reference_delete(git_reference *ref);
+
+/**
+ * Delete an existing reference by name
+ *
+ * This method removes the named reference from the repository without
+ * looking at its old value.
+ *
+ * @param name The reference to remove
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_remove(git_repository *repo, const char *name);
+
+/**
+ * Fill a list with all the references that can be found in a repository.
+ *
+ * The string array will be filled with the names of all references; these
+ * values are owned by the user and should be free'd manually when no
+ * longer needed, using `git_strarray_free()`.
+ *
+ * @param array Pointer to a git_strarray structure where
+ * the reference names will be stored
+ * @param repo Repository where to find the refs
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_list(git_strarray *array, git_repository *repo);
+
+/**
+ * Callback used to iterate over references
+ *
+ * @see git_reference_foreach
+ *
+ * @param reference The reference object
+ * @param payload Payload passed to git_reference_foreach
+ * @return non-zero to terminate the iteration
+ */
+typedef int GIT_CALLBACK(git_reference_foreach_cb)(git_reference *reference, void *payload);
+
+/**
+ * Callback used to iterate over reference names
+ *
+ * @see git_reference_foreach_name
+ *
+ * @param name The reference name
+ * @param payload Payload passed to git_reference_foreach_name
+ * @return non-zero to terminate the iteration
+ */
+typedef int GIT_CALLBACK(git_reference_foreach_name_cb)(const char *name, void *payload);
+
+/**
+ * Perform a callback on each reference in the repository.
+ *
+ * The `callback` function will be called for each reference in the
+ * repository, receiving the reference object and the `payload` value
+ * passed to this method. Returning a non-zero value from the callback
+ * will terminate the iteration.
+ *
+ * Note that the callback function is responsible to call `git_reference_free`
+ * on each reference passed to it.
+ *
+ * @param repo Repository where to find the refs
+ * @param callback Function which will be called for every listed ref
+ * @param payload Additional data to pass to the callback
+ * @return 0 on success, non-zero callback return value, or error code
+ */
+GIT_EXTERN(int) git_reference_foreach(
+ git_repository *repo,
+ git_reference_foreach_cb callback,
+ void *payload);
+
+/**
+ * Perform a callback on the fully-qualified name of each reference.
+ *
+ * The `callback` function will be called for each reference in the
+ * repository, receiving the name of the reference and the `payload` value
+ * passed to this method. Returning a non-zero value from the callback
+ * will terminate the iteration.
+ *
+ * @param repo Repository where to find the refs
+ * @param callback Function which will be called for every listed ref name
+ * @param payload Additional data to pass to the callback
+ * @return 0 on success, non-zero callback return value, or error code
+ */
+GIT_EXTERN(int) git_reference_foreach_name(
+ git_repository *repo,
+ git_reference_foreach_name_cb callback,
+ void *payload);
+
+/**
+ * Create a copy of an existing reference.
+ *
+ * Call `git_reference_free` to free the data.
+ *
+ * @param dest pointer where to store the copy
+ * @param source object to copy
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_dup(git_reference **dest, git_reference *source);
+
+/**
+ * Free the given reference.
+ *
+ * @param ref git_reference
+ */
+GIT_EXTERN(void) git_reference_free(git_reference *ref);
+
+/**
+ * Compare two references.
+ *
+ * @param ref1 The first git_reference
+ * @param ref2 The second git_reference
+ * @return 0 if the same, else a stable but meaningless ordering.
+ */
+GIT_EXTERN(int) git_reference_cmp(
+ const git_reference *ref1,
+ const git_reference *ref2);
+
+/**
+ * Create an iterator for the repo's references
+ *
+ * @param out pointer in which to store the iterator
+ * @param repo the repository
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_iterator_new(
+ git_reference_iterator **out,
+ git_repository *repo);
+
+/**
+ * Create an iterator for the repo's references that match the
+ * specified glob
+ *
+ * @param out pointer in which to store the iterator
+ * @param repo the repository
+ * @param glob the glob to match against the reference names
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_reference_iterator_glob_new(
+ git_reference_iterator **out,
+ git_repository *repo,
+ const char *glob);
+
+/**
+ * Get the next reference
+ *
+ * @param out pointer in which to store the reference
+ * @param iter the iterator
+ * @return 0, GIT_ITEROVER if there are no more; or an error code
+ */
+GIT_EXTERN(int) git_reference_next(git_reference **out, git_reference_iterator *iter);
+
+/**
+ * Get the next reference's name
+ *
+ * This function is provided for convenience in case only the names
+ * are interesting as it avoids the allocation of the `git_reference`
+ * object which `git_reference_next()` needs.
+ *
+ * @param out pointer in which to store the string
+ * @param iter the iterator
+ * @return 0, GIT_ITEROVER if there are no more; or an error code
+ */
+GIT_EXTERN(int) git_reference_next_name(const char **out, git_reference_iterator *iter);
+
+/**
+ * Free the iterator and its associated resources
+ *
+ * @param iter the iterator to free
+ */
+GIT_EXTERN(void) git_reference_iterator_free(git_reference_iterator *iter);
+
+/**
+ * Perform a callback on each reference in the repository whose name
+ * matches the given pattern.
+ *
+ * This function acts like `git_reference_foreach()` with an additional
+ * pattern match being applied to the reference name before issuing the
+ * callback function. See that function for more information.
+ *
+ * The pattern is matched using fnmatch or "glob" style where a '*' matches
+ * any sequence of letters, a '?' matches any letter, and square brackets
+ * can be used to define character ranges (such as "[0-9]" for digits).
+ *
+ * @param repo Repository where to find the refs
+ * @param glob Pattern to match (fnmatch-style) against reference name.
+ * @param callback Function which will be called for every listed ref
+ * @param payload Additional data to pass to the callback
+ * @return 0 on success, GIT_EUSER on non-zero callback, or error code
+ */
+GIT_EXTERN(int) git_reference_foreach_glob(
+ git_repository *repo,
+ const char *glob,
+ git_reference_foreach_name_cb callback,
+ void *payload);
+
+/**
+ * Check if a reflog exists for the specified reference.
+ *
+ * @param repo the repository
+ * @param refname the reference's name
+ * @return 0 when no reflog can be found, 1 when it exists;
+ * otherwise an error code.
+ */
+GIT_EXTERN(int) git_reference_has_log(git_repository *repo, const char *refname);
+
+/**
+ * Ensure there is a reflog for a particular reference.
+ *
+ * Make sure that successive updates to the reference will append to
+ * its log.
+ *
+ * @param repo the repository
+ * @param refname the reference's name
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_reference_ensure_log(git_repository *repo, const char *refname);
+
+/**
+ * Check if a reference is a local branch.
+ *
+ * @param ref A git reference
+ *
+ * @return 1 when the reference lives in the refs/heads
+ * namespace; 0 otherwise.
+ */
+GIT_EXTERN(int) git_reference_is_branch(const git_reference *ref);
+
+/**
+ * Check if a reference is a remote tracking branch
+ *
+ * @param ref A git reference
+ *
+ * @return 1 when the reference lives in the refs/remotes
+ * namespace; 0 otherwise.
+ */
+GIT_EXTERN(int) git_reference_is_remote(const git_reference *ref);
+
+/**
+ * Check if a reference is a tag
+ *
+ * @param ref A git reference
+ *
+ * @return 1 when the reference lives in the refs/tags
+ * namespace; 0 otherwise.
+ */
+GIT_EXTERN(int) git_reference_is_tag(const git_reference *ref);
+
+/**
+ * Check if a reference is a note
+ *
+ * @param ref A git reference
+ *
+ * @return 1 when the reference lives in the refs/notes
+ * namespace; 0 otherwise.
+ */
+GIT_EXTERN(int) git_reference_is_note(const git_reference *ref);
+
+/**
+ * Normalization options for reference lookup
+ */
+typedef enum {
+ /**
+ * No particular normalization.
+ */
+ GIT_REFERENCE_FORMAT_NORMAL = 0u,
+
+ /**
+ * Control whether one-level refnames are accepted
+ * (i.e., refnames that do not contain multiple /-separated
+ * components). Those are expected to be written only using
+ * uppercase letters and underscore (FETCH_HEAD, ...)
+ */
+ GIT_REFERENCE_FORMAT_ALLOW_ONELEVEL = (1u << 0),
+
+ /**
+ * Interpret the provided name as a reference pattern for a
+ * refspec (as used with remote repositories). If this option
+ * is enabled, the name is allowed to contain a single * (<star>)
+ * in place of a one full pathname component
+ * (e.g., foo/<star>/bar but not foo/bar<star>).
+ */
+ GIT_REFERENCE_FORMAT_REFSPEC_PATTERN = (1u << 1),
+
+ /**
+ * Interpret the name as part of a refspec in shorthand form
+ * so the `ONELEVEL` naming rules aren't enforced and 'master'
+ * becomes a valid name.
+ */
+ GIT_REFERENCE_FORMAT_REFSPEC_SHORTHAND = (1u << 2)
+} git_reference_format_t;
+
+/**
+ * Normalize reference name and check validity.
+ *
+ * This will normalize the reference name by removing any leading slash
+ * '/' characters and collapsing runs of adjacent slashes between name
+ * components into a single slash.
+ *
+ * Once normalized, if the reference name is valid, it will be returned in
+ * the user allocated buffer.
+ *
+ * See `git_reference_symbolic_create()` for rules about valid names.
+ *
+ * @param buffer_out User allocated buffer to store normalized name
+ * @param buffer_size Size of buffer_out
+ * @param name Reference name to be checked.
+ * @param flags Flags to constrain name validation rules - see the
+ * GIT_REFERENCE_FORMAT constants above.
+ * @return 0 on success, GIT_EBUFS if buffer is too small, GIT_EINVALIDSPEC
+ * or an error code.
+ */
+GIT_EXTERN(int) git_reference_normalize_name(
+ char *buffer_out,
+ size_t buffer_size,
+ const char *name,
+ unsigned int flags);
+
+/**
+ * Recursively peel reference until object of the specified type is found.
+ *
+ * The retrieved `peeled` object is owned by the repository
+ * and should be closed with the `git_object_free` method.
+ *
+ * If you pass `GIT_OBJECT_ANY` as the target type, then the object
+ * will be peeled until a non-tag object is met.
+ *
+ * @param out Pointer to the peeled git_object
+ * @param ref The reference to be processed
+ * @param type The type of the requested object (GIT_OBJECT_COMMIT,
+ * GIT_OBJECT_TAG, GIT_OBJECT_TREE, GIT_OBJECT_BLOB or GIT_OBJECT_ANY).
+ * @return 0 on success, GIT_EAMBIGUOUS, GIT_ENOTFOUND or an error code
+ */
+GIT_EXTERN(int) git_reference_peel(
+ git_object **out,
+ const git_reference *ref,
+ git_object_t type);
+
+/**
+ * Ensure the reference name is well-formed.
+ *
+ * Valid reference names must follow one of two patterns:
+ *
+ * 1. Top-level names must contain only capital letters and underscores,
+ * and must begin and end with a letter. (e.g. "HEAD", "ORIG_HEAD").
+ * 2. Names prefixed with "refs/" can be almost anything. You must avoid
+ * the characters '~', '^', ':', '\\', '?', '[', and '*', and the
+ * sequences ".." and "@{" which have special meaning to revparse.
+ *
+ * @param valid output pointer to set with validity of given reference name
+ * @param refname name to be checked.
+ * @return 0 on success or an error code
+ */
+GIT_EXTERN(int) git_reference_name_is_valid(int *valid, const char *refname);
+
+/**
+ * Get the reference's short name
+ *
+ * This will transform the reference name into a name "human-readable"
+ * version. If no shortname is appropriate, it will return the full
+ * name.
+ *
+ * The memory is owned by the reference and must not be freed.
+ *
+ * @param ref a reference
+ * @return the human-readable version of the name
+ */
+GIT_EXTERN(const char *) git_reference_shorthand(const git_reference *ref);
+
+/** @} */
+GIT_END_DECL
+#endif