/*
 * 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.
 */
module libgit2_d.index;


private static import libgit2_d.oid;
private static import libgit2_d.strarray;
private static import libgit2_d.types;
private static import std.traits;

/**
 * @file git2/index.h
 * @brief Git index parsing and manipulation routines
 * @defgroup git_index Git index parsing and manipulation routines
 * @ingroup Git
 * @{
 */
extern (C):
nothrow @nogc:
public:

/**
 * Time structure used in a git index entry
 */
struct git_index_time
{
	int seconds;

	/**
	 * nsec should not be stored as time_t compatible
	 */
	uint nanoseconds;
}

/**
 * In-memory representation of a file entry in the index.
 *
 * This is a public structure that represents a file entry in the index.
 * The meaning of the fields corresponds to core Git's documentation (in
 * "Documentation/technical/index-format.txt").
 *
 * The `flags` field consists of a number of bit fields which can be
 * accessed via the first set of `GIT_INDEX_ENTRY_...` bitmasks below.
 * These flags are all read from and persisted to disk.
 *
 * The `flags_extended` field also has a number of bit fields which can be
 * accessed via the later `GIT_INDEX_ENTRY_...` bitmasks below.  Some of
 * these flags are read from and written to disk, but some are set aside
 * for in-memory only reference.
 *
 * Note that the time and size fields are truncated to 32 bits. This
 * is enough to detect changes, which is enough for the index to
 * function as a cache, but it should not be taken as an authoritative
 * source for that data.
 */
struct git_index_entry
{
	.git_index_time ctime;
	.git_index_time mtime;

	uint dev;
	uint ino;
	uint mode;
	uint uid;
	uint gid;
	uint file_size;

	libgit2_d.oid.git_oid id;

	ushort flags;
	ushort flags_extended;

	const (char)* path;
}

/**
 * Bitmasks for on-disk fields of `git_index_entry`'s `flags`
 *
 * These bitmasks match the four fields in the `git_index_entry` `flags`
 * value both in memory and on disk.  You can use them to interpret the
 * data in the `flags`.
 */
enum GIT_INDEX_ENTRY_NAMEMASK = 0x0FFF;
enum GIT_INDEX_ENTRY_STAGEMASK = 0x3000;
enum GIT_INDEX_ENTRY_STAGESHIFT = 12;

/**
 * Flags for index entries
 */
enum git_index_entry_flag_t
{
	GIT_INDEX_ENTRY_EXTENDED = 0x4000,
	GIT_INDEX_ENTRY_VALID = 0x8000,
}

pragma(inline, true)
pure nothrow @safe @nogc
ushort GIT_INDEX_ENTRY_STAGE(const ref .git_index_entry E)

	do
	{
		return (E.flags & .GIT_INDEX_ENTRY_STAGEMASK) >> .GIT_INDEX_ENTRY_STAGESHIFT;
	}

pragma(inline, true)
pure nothrow @safe @nogc
void GIT_INDEX_ENTRY_STAGE_SET(T)(ref .git_index_entry E, T S)
	if (std.traits.isIntegral!(T))

	do
	{
		E.flags = (E.flags & ~.GIT_INDEX_ENTRY_STAGEMASK) | ((S & 0x03) << .GIT_INDEX_ENTRY_STAGESHIFT);
	}

/**
 * Bitmasks for on-disk fields of `git_index_entry`'s `flags_extended`
 *
 * In memory, the `flags_extended` fields are divided into two parts: the
 * fields that are read from and written to disk, and other fields that
 * in-memory only and used by libgit2.  Only the flags in
 * `GIT_INDEX_ENTRY_EXTENDED_FLAGS` will get saved on-disk.
 *
 * Thee first three bitmasks match the three fields in the
 * `git_index_entry` `flags_extended` value that belong on disk.  You
 * can use them to interpret the data in the `flags_extended`.
 *
 * The rest of the bitmasks match the other fields in the `git_index_entry`
 * `flags_extended` value that are only used in-memory by libgit2.
 * You can use them to interpret the data in the `flags_extended`.
 *
 */
enum git_index_entry_extended_flag_t
{
	GIT_INDEX_ENTRY_INTENT_TO_ADD = 1 << 13,
	GIT_INDEX_ENTRY_SKIP_WORKTREE = 1 << 14,

	GIT_INDEX_ENTRY_EXTENDED_FLAGS = GIT_INDEX_ENTRY_INTENT_TO_ADD | GIT_INDEX_ENTRY_SKIP_WORKTREE,

	GIT_INDEX_ENTRY_UPTODATE = 1 << 2,
}

/**
 * Capabilities of system that affect index actions.
 */
enum git_index_capability_t
{
	GIT_INDEX_CAPABILITY_IGNORE_CASE = 1,
	GIT_INDEX_CAPABILITY_NO_FILEMODE = 2,
	GIT_INDEX_CAPABILITY_NO_SYMLINKS = 4,
	GIT_INDEX_CAPABILITY_FROM_OWNER = -1,
}

/**
 * Callback for APIs that add/remove/update files matching pathspec
 */
alias git_index_matched_path_cb = int function(const (char)* path, const (char)* matched_pathspec, void* payload);

/**
 * Flags for APIs that add files matching pathspec
 */
enum git_index_add_option_t
{
	GIT_INDEX_ADD_DEFAULT = 0,
	GIT_INDEX_ADD_FORCE = 1u << 0,
	GIT_INDEX_ADD_DISABLE_PATHSPEC_MATCH = 1u << 1,
	GIT_INDEX_ADD_CHECK_PATHSPEC = 1u << 2,
}

/**
 * Git index stage states
 */
enum git_index_stage_t
{
	/**
	 * Match any index stage.
	 *
	 * Some index APIs take a stage to match; pass this value to match
	 * any entry matching the path regardless of stage.
	 */
	GIT_INDEX_STAGE_ANY = -1,

	/**
	 * A normal staged file in the index.
	 */
	GIT_INDEX_STAGE_NORMAL = 0,

	/**
	 * The ancestor side of a conflict.
	 */
	GIT_INDEX_STAGE_ANCESTOR = 1,

	/**
	 * The "ours" side of a conflict.
	 */
	GIT_INDEX_STAGE_OURS = 2,

	/**
	 * The "theirs" side of a conflict.
	 */
	GIT_INDEX_STAGE_THEIRS = 3,
}

/**
 * Create a new bare Git index object as a memory representation
 * of the Git index file in 'index_path', without a repository
 * to back it.
 *
 * Since there is no ODB or working directory behind this index,
 * any Index methods which rely on these (e.g. index_add_bypath)
 * will fail with the git_error_code.GIT_ERROR error code.
 *
 * If you need to access the index of an actual repository,
 * use the `git_repository_index` wrapper.
 *
 * The index must be freed once it's no longer in use.
 *
 * Params:
 *      out_ = the pointer for the new index
 *      index_path = the path to the index file in disk
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_open(libgit2_d.types.git_index** out_, const (char)* index_path);

/**
 * Create an in-memory index object.
 *
 * This index object cannot be read/written to the filesystem,
 * but may be used to perform in-memory index operations.
 *
 * The index must be freed once it's no longer in use.
 *
 * Params:
 *      out_ = the pointer for the new index
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_new(libgit2_d.types.git_index** out_);

/**
 * Free an existing index object.
 *
 * Params:
 *      index = an existing index object
 */
//GIT_EXTERN
void git_index_free(libgit2_d.types.git_index* index);

/**
 * Get the repository this index relates to
 *
 * Params:
 *      index = The index
 *
 * Returns: A pointer to the repository
 */
//GIT_EXTERN
libgit2_d.types.git_repository* git_index_owner(const (libgit2_d.types.git_index)* index);

/**
 * Read index capabilities flags.
 *
 * Params:
 *      index = An existing index object
 *
 * Returns: A combination of GIT_INDEX_CAPABILITY values
 */
//GIT_EXTERN
int git_index_caps(const (libgit2_d.types.git_index)* index);

/**
 * Set index capabilities flags.
 *
 * If you pass `git_index_capability_t.GIT_INDEX_CAPABILITY_FROM_OWNER` for the caps, then
 * capabilities will be read from the config of the owner object,
 * looking at `core.ignorecase`, `core.filemode`, `core.symlinks`.
 *
 * Params:
 *      index = An existing index object
 *      caps = A combination of GIT_INDEX_CAPABILITY values
 *
 * Returns: 0 on success, -1 on failure
 */
//GIT_EXTERN
int git_index_set_caps(libgit2_d.types.git_index* index, int caps);

/**
 * Get index on-disk version.
 *
 * Valid return values are 2, 3, or 4.  If 3 is returned, an index
 * with version 2 may be written instead, if the extension data in
 * version 3 is not necessary.
 *
 * Params:
 *      index = An existing index object
 *
 * Returns: the index version
 */
//GIT_EXTERN
uint git_index_version(libgit2_d.types.git_index* index);

/**
 * Set index on-disk version.
 *
 * Valid values are 2, 3, or 4.  If 2 is given, git_index_write may
 * write an index with version 3 instead, if necessary to accurately
 * represent the index.
 *
 * Params:
 *      index = An existing index object
 *      version_ = The new version number
 *
 * Returns: 0 on success, -1 on failure
 */
//GIT_EXTERN
int git_index_set_version(libgit2_d.types.git_index* index, uint version_);

/**
 * Update the contents of an existing index object in memory by reading
 * from the hard disk.
 *
 * If `force` is true, this performs a "hard" read that discards in-memory
 * changes and always reloads the on-disk index data.  If there is no
 * on-disk version, the index will be cleared.
 *
 * If `force` is false, this does a "soft" read that reloads the index
 * data from disk only if it has changed since the last time it was
 * loaded.  Purely in-memory index data will be untouched.  Be aware: if
 * there are changes on disk, unwritten in-memory changes are discarded.
 *
 * Params:
 *      index = an existing index object
 *      force = if true, always reload, vs. only read if file has changed
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_read(libgit2_d.types.git_index* index, int force);

/**
 * Write an existing index object from memory back to disk
 * using an atomic file lock.
 *
 * Params:
 *      index = an existing index object
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_write(libgit2_d.types.git_index* index);

/**
 * Get the full path to the index file on disk.
 *
 * Params:
 *      index = an existing index object
 *
 * Returns: path to index file or null for in-memory index
 */
//GIT_EXTERN
const (char)* git_index_path(const (libgit2_d.types.git_index)* index);

/**
 * Get the checksum of the index
 *
 * This checksum is the SHA-1 hash over the index file (except the
 * last 20 bytes which are the checksum itself). In cases where the
 * index does not exist on-disk, it will be zeroed out.
 *
 * Params:
 *      index = an existing index object
 *
 * Returns: a pointer to the checksum of the index
 */
//GIT_EXTERN
const (libgit2_d.oid.git_oid)* git_index_checksum(libgit2_d.types.git_index* index);

/**
 * Read a tree into the index file with stats
 *
 * The current index contents will be replaced by the specified tree.
 *
 * Params:
 *      index = an existing index object
 *      tree = tree to read
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_read_tree(libgit2_d.types.git_index* index, const (libgit2_d.types.git_tree)* tree);

/**
 * Write the index as a tree
 *
 * This method will scan the index and write a representation
 * of its current state back to disk; it recursively creates
 * tree objects for each of the subtrees stored in the index,
 * but only returns the OID of the root tree. This is the OID
 * that can be used e.g. to create a commit.
 *
 * The index instance cannot be bare, and needs to be associated
 * to an existing repository.
 *
 * The index must not contain any file in conflict.
 *
 * Params:
 *      out_ = Pointer where to store the OID of the written tree
 *      index = Index to write
 *
 * Returns: 0 on success, git_error_code.GIT_EUNMERGED when the index is not clean or an error code
 */
//GIT_EXTERN
int git_index_write_tree(libgit2_d.oid.git_oid* out_, libgit2_d.types.git_index* index);

/**
 * Write the index as a tree to the given repository
 *
 * This method will do the same as `git_index_write_tree`, but
 * letting the user choose the repository where the tree will
 * be written.
 *
 * The index must not contain any file in conflict.
 *
 * Params:
 *      out_ = Pointer where to store OID of the the written tree
 *      index = Index to write
 *      repo = Repository where to write the tree
 *
 * Returns: 0 on success, git_error_code.GIT_EUNMERGED when the index is not clean or an error code
 */
//GIT_EXTERN
int git_index_write_tree_to(libgit2_d.oid.git_oid* out_, libgit2_d.types.git_index* index, libgit2_d.types.git_repository* repo);

/**@}*/

/**
 * @name Raw Index Entry Functions
 *
 * These functions work on index entries, and allow for raw manipulation
 * of the entries.
 */
/**@{*/

/* Index entry manipulation */

/**
 * Get the count of entries currently in the index
 *
 * Params:
 *      index = an existing index object
 *
 * Returns: integer of count of current entries
 */
//GIT_EXTERN
size_t git_index_entrycount(const (libgit2_d.types.git_index)* index);

/**
 * Clear the contents (all the entries) of an index object.
 *
 * This clears the index object in memory; changes must be explicitly
 * written to disk for them to take effect persistently.
 *
 * Params:
 *      index = an existing index object
 *
 * Returns: 0 on success, error code < 0 on failure
 */
//GIT_EXTERN
int git_index_clear(libgit2_d.types.git_index* index);

/**
 * Get a pointer to one of the entries in the index
 *
 * The entry is not modifiable and should not be freed.  Because the
 * `git_index_entry` struct is a publicly defined struct, you should
 * be able to make your own permanent copy of the data if necessary.
 *
 * Params:
 *      index = an existing index object
 *      n = the position of the entry
 *
 * Returns: a pointer to the entry; null if out of bounds
 */
//GIT_EXTERN
const (.git_index_entry)* git_index_get_byindex(libgit2_d.types.git_index* index, size_t n);

/**
 * Get a pointer to one of the entries in the index
 *
 * The entry is not modifiable and should not be freed.  Because the
 * `git_index_entry` struct is a publicly defined struct, you should
 * be able to make your own permanent copy of the data if necessary.
 *
 * Params:
 *      index = an existing index object
 *      path = path to search
 *      stage = stage to search
 *
 * Returns: a pointer to the entry; null if it was not found
 */
//GIT_EXTERN
const (.git_index_entry)* git_index_get_bypath(libgit2_d.types.git_index* index, const (char)* path, int stage);

/**
 * Remove an entry from the index
 *
 * Params:
 *      index = an existing index object
 *      path = path to search
 *      stage = stage to search
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_remove(libgit2_d.types.git_index* index, const (char)* path, int stage);

/**
 * Remove all entries from the index under a given directory
 *
 * Params:
 *      index = an existing index object
 *      dir = container directory path
 *      stage = stage to search
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_remove_directory(libgit2_d.types.git_index* index, const (char)* dir, int stage);

/**
 * Add or update an index entry from an in-memory struct
 *
 * If a previous index entry exists that has the same path and stage
 * as the given 'source_entry', it will be replaced.  Otherwise, the
 * 'source_entry' will be added.
 *
 * A full copy (including the 'path' string) of the given
 * 'source_entry' will be inserted on the index.
 *
 * Params:
 *      index = an existing index object
 *      source_entry = new entry object
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_add(libgit2_d.types.git_index* index, const (.git_index_entry)* source_entry);

/**
 * Return the stage number from a git index entry
 *
 * This entry is calculated from the entry's flag attribute like this:
 *
 *    (entry->flags & GIT_INDEX_ENTRY_STAGEMASK) >> GIT_INDEX_ENTRY_STAGESHIFT
 *
 * Params:
 *      entry = The entry
 *
 * Returns: the stage number
 */
//GIT_EXTERN
int git_index_entry_stage(const (.git_index_entry)* entry);

/**
 * Return whether the given index entry is a conflict (has a high stage
 * entry).  This is simply shorthand for `git_index_entry_stage > 0`.
 *
 * Params:
 *      entry = The entry
 *
 * Returns: 1 if the entry is a conflict entry, 0 otherwise
 */
//GIT_EXTERN
int git_index_entry_is_conflict(const (.git_index_entry)* entry);

/**@}*/

/** @name Index Entry Iteration Functions
 *
 * These functions provide an iterator for index entries.
 */
/**@{*/

/**
 * Create an iterator that will return every entry contained in the
 * index at the time of creation.  Entries are returned in order,
 * sorted by path.  This iterator is backed by a snapshot that allows
 * callers to modify the index while iterating without affecting the
 * iterator.
 *
 * Params:
 *      iterator_out = The newly created iterator
 *      index = The index to iterate
 */
//GIT_EXTERN
int git_index_iterator_new(libgit2_d.types.git_index_iterator** iterator_out, libgit2_d.types.git_index* index);

/**
 * Return the next index entry in-order from the iterator.
 *
 * Params:
 *      out_ = Pointer to store the index entry in
 *      iterator = The iterator
 *
 * Returns: 0, git_error_code.GIT_ITEROVER on iteration completion or an error code
 */
//GIT_EXTERN
int git_index_iterator_next(const (.git_index_entry)** out_, libgit2_d.types.git_index_iterator* iterator);

/**
 * Free the index iterator
 *
 * Params:
 *      iterator = The iterator to free
 */
//GIT_EXTERN
void git_index_iterator_free(libgit2_d.types.git_index_iterator* iterator);

/**@}*/

/**
 * @name Workdir Index Entry Functions
 *
 * These functions work on index entries specifically in the working
 * directory (ie, stage 0).
 */
/**@{*/

/**
 * Add or update an index entry from a file on disk
 *
 * The file `path` must be relative to the repository's
 * working folder and must be readable.
 *
 * This method will fail in bare index instances.
 *
 * This forces the file to be added to the index, not looking
 * at gitignore rules.  Those rules can be evaluated through
 * the git_status APIs (in status.h) before calling this.
 *
 * If this file currently is the result of a merge conflict, this
 * file will no longer be marked as conflicting.  The data about
 * the conflict will be moved to the "resolve undo" (REUC) section.
 *
 * Params:
 *      index = an existing index object
 *      path = filename to add
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_add_bypath(libgit2_d.types.git_index* index, const (char)* path);

/**
 * Add or update an index entry from a buffer in memory
 *
 * This method will create a blob in the repository that owns the
 * index and then add the index entry to the index.  The `path` of the
 * entry represents the position of the blob relative to the
 * repository's root folder.
 *
 * If a previous index entry exists that has the same path as the
 * given 'entry', it will be replaced.  Otherwise, the 'entry' will be
 * added. The `id` and the `file_size` of the 'entry' are updated with the
 * real value of the blob.
 *
 * This forces the file to be added to the index, not looking
 * at gitignore rules.  Those rules can be evaluated through
 * the git_status APIs (in status.h) before calling this.
 *
 * If this file currently is the result of a merge conflict, this
 * file will no longer be marked as conflicting.  The data about
 * the conflict will be moved to the "resolve undo" (REUC) section.
 *
 * Params:
 *      index = an existing index object
 *      entry = filename to add
 *      buffer = data to be written into the blob
 *      len = length of the data
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_add_from_buffer(libgit2_d.types.git_index* index, const (.git_index_entry)* entry, const (void)* buffer, size_t len);

/**
 * Remove an index entry corresponding to a file on disk
 *
 * The file `path` must be relative to the repository's
 * working folder.  It may exist.
 *
 * If this file currently is the result of a merge conflict, this
 * file will no longer be marked as conflicting.  The data about
 * the conflict will be moved to the "resolve undo" (REUC) section.
 *
 * Params:
 *      index = an existing index object
 *      path = filename to remove
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_remove_bypath(libgit2_d.types.git_index* index, const (char)* path);

/**
 * Add or update index entries matching files in the working directory.
 *
 * This method will fail in bare index instances.
 *
 * The `pathspec` is a list of file names or shell glob patterns that will
 * be matched against files in the repository's working directory.  Each
 * file that matches will be added to the index (either updating an
 * existing entry or adding a new entry).  You can disable glob expansion
 * and force exact matching with the `git_index_add_option_t.GIT_INDEX_ADD_DISABLE_PATHSPEC_MATCH`
 * flag.
 *
 * Files that are ignored will be skipped (unlike `git_index_add_bypath`).
 * If a file is already tracked in the index, then it *will* be updated
 * even if it is ignored.  Pass the `git_index_add_option_t.GIT_INDEX_ADD_FORCE` flag to skip
 * the checking of ignore rules.
 *
 * To emulate `git add -A` and generate an error if the pathspec contains
 * the exact path of an ignored file (when not using FORCE), add the
 * `git_index_add_option_t.GIT_INDEX_ADD_CHECK_PATHSPEC` flag.  This checks that each entry
 * in the `pathspec` that is an exact match to a filename on disk is
 * either not ignored or already in the index.  If this check fails, the
 * function will return git_error_code.GIT_EINVALIDSPEC.
 *
 * To emulate `git add -A` with the "dry-run" option, just use a callback
 * function that always returns a positive value.  See below for details.
 *
 * If any files are currently the result of a merge conflict, those files
 * will no longer be marked as conflicting.  The data about the conflicts
 * will be moved to the "resolve undo" (REUC) section.
 *
 * If you provide a callback function, it will be invoked on each matching
 * item in the working directory immediately *before* it is added to /
 * updated in the index.  Returning zero will add the item to the index,
 * greater than zero will skip the item, and less than zero will abort the
 * scan and return that value to the caller.
 *
 * Params:
 *      index = an existing index object
 *      pathspec = array of path patterns
 *      flags = combination of git_index_add_option_t flags
 *      callback = notification callback for each added/updated path (also gets index of matching pathspec entry); can be null; return 0 to add, >0 to skip, <0 to abort scan.
 *      payload = payload passed through to callback function
 *
 * Returns: 0 on success, negative callback return value, or error code
 */
//GIT_EXTERN
int git_index_add_all(libgit2_d.types.git_index* index, const (libgit2_d.strarray.git_strarray)* pathspec, uint flags, .git_index_matched_path_cb callback, void* payload);

/**
 * Remove all matching index entries.
 *
 * If you provide a callback function, it will be invoked on each matching
 * item in the index immediately *before* it is removed.  Return 0 to
 * remove the item, > 0 to skip the item, and < 0 to abort the scan.
 *
 * Params:
 *      index = An existing index object
 *      pathspec = array of path patterns
 *      callback = notification callback for each removed path (also gets index of matching pathspec entry); can be null; return 0 to add, >0 to skip, <0 to abort scan.
 *      payload = payload passed through to callback function
 *
 * Returns: 0 on success, negative callback return value, or error code
 */
//GIT_EXTERN
int git_index_remove_all(libgit2_d.types.git_index* index, const (libgit2_d.strarray.git_strarray)* pathspec, .git_index_matched_path_cb callback, void* payload);

/**
 * Update all index entries to match the working directory
 *
 * This method will fail in bare index instances.
 *
 * This scans the existing index entries and synchronizes them with the
 * working directory, deleting them if the corresponding working directory
 * file no longer exists otherwise updating the information (including
 * adding the latest version of file to the ODB if needed).
 *
 * If you provide a callback function, it will be invoked on each matching
 * item in the index immediately *before* it is updated (either refreshed
 * or removed depending on working directory state).  Return 0 to proceed
 * with updating the item, > 0 to skip the item, and < 0 to abort the scan.
 *
 * Params:
 *      index = An existing index object
 *      pathspec = array of path patterns
 *      callback = notification callback for each updated path (also gets index of matching pathspec entry); can be null; return 0 to add, >0 to skip, <0 to abort scan.
 *      payload = payload passed through to callback function
 *
 * Returns: 0 on success, negative callback return value, or error code
 */
//GIT_EXTERN
int git_index_update_all(libgit2_d.types.git_index* index, const (libgit2_d.strarray.git_strarray)* pathspec, .git_index_matched_path_cb callback, void* payload);

/**
 * Find the first position of any entries which point to given
 * path in the Git index.
 *
 * Params:
 *      at_pos = the address to which the position of the index entry is written (optional)
 *      index = an existing index object
 *      path = path to search
 *
 * Returns: a zero-based position in the index if found; git_error_code.GIT_ENOTFOUND otherwise
 */
//GIT_EXTERN
int git_index_find(size_t* at_pos, libgit2_d.types.git_index* index, const (char)* path);

/**
 * Find the first position of any entries matching a prefix. To find the first
 * position of a path inside a given folder, suffix the prefix with a '/'.
 *
 * Params:
 *      at_pos = the address to which the position of the index entry is written (optional)
 *      index = an existing index object
 *      prefix = the prefix to search for
 *
 * Returns: 0 with valid value in at_pos; an error code otherwise
 */
//GIT_EXTERN
int git_index_find_prefix(size_t* at_pos, libgit2_d.types.git_index* index, const (char)* prefix);

/**@}*/

/**
 * @name Conflict Index Entry Functions
 *
 * These functions work on conflict index entries specifically (ie, stages 1-3)
 */
/**@{*/

/**
 * Add or update index entries to represent a conflict.  Any staged
 * entries that exist at the given paths will be removed.
 *
 * The entries are the entries from the tree included in the merge.  Any
 * entry may be null to indicate that that file was not present in the
 * trees during the merge.  For example, ancestor_entry may be null to
 * indicate that a file was added in both branches and must be resolved.
 *
 * Params:
 *      index = an existing index object
 *      ancestor_entry = the entry data for the ancestor of the conflict
 *      our_entry = the entry data for our side of the merge conflict
 *      their_entry = the entry data for their side of the merge conflict
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_conflict_add(libgit2_d.types.git_index* index, const (.git_index_entry)* ancestor_entry, const (.git_index_entry)* our_entry, const (.git_index_entry)* their_entry);

/**
 * Get the index entries that represent a conflict of a single file.
 *
 * The entries are not modifiable and should not be freed.  Because the
 * `git_index_entry` struct is a publicly defined struct, you should
 * be able to make your own permanent copy of the data if necessary.
 *
 * Params:
 *      ancestor_out = Pointer to store the ancestor entry
 *      our_out = Pointer to store the our entry
 *      their_out = Pointer to store the their entry
 *      index = an existing index object
 *      path = path to search
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_conflict_get(const (.git_index_entry)** ancestor_out, const (.git_index_entry)** our_out, const (.git_index_entry)** their_out, libgit2_d.types.git_index* index, const (char)* path);

/**
 * Removes the index entries that represent a conflict of a single file.
 *
 * Params:
 *      index = an existing index object
 *      path = path to remove conflicts for
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_conflict_remove(libgit2_d.types.git_index* index, const (char)* path);

/**
 * Remove all conflicts in the index (entries with a stage greater than 0).
 *
 * Params:
 *      index = an existing index object
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_conflict_cleanup(libgit2_d.types.git_index* index);

/**
 * Determine if the index contains entries representing file conflicts.
 *
 * Returns: 1 if at least one conflict is found, 0 otherwise.
 */
//GIT_EXTERN
int git_index_has_conflicts(const (libgit2_d.types.git_index)* index);

/**
 * Create an iterator for the conflicts in the index.
 *
 * The index must not be modified while iterating; the results are undefined.
 *
 * Params:
 *      iterator_out = The newly created conflict iterator
 *      index = The index to scan
 *
 * Returns: 0 or an error code
 */
//GIT_EXTERN
int git_index_conflict_iterator_new(libgit2_d.types.git_index_conflict_iterator** iterator_out, libgit2_d.types.git_index* index);

/**
 * Returns the current conflict (ancestor, ours and theirs entry) and
 * advance the iterator internally to the next value.
 *
 * Params:
 *      ancestor_out = Pointer to store the ancestor side of the conflict
 *      our_out = Pointer to store our side of the conflict
 *      their_out = Pointer to store their side of the conflict
 *
 * Returns: 0 (no error), git_error_code.GIT_ITEROVER (iteration is done) or an error code (negative value)
 */
//GIT_EXTERN
int git_index_conflict_next(const (.git_index_entry)** ancestor_out, const (.git_index_entry)** our_out, const (.git_index_entry)** their_out, libgit2_d.types.git_index_conflict_iterator* iterator);

/**
 * Frees a `git_index_conflict_iterator`.
 *
 * Params:
 *      iterator = pointer to the iterator
 */
//GIT_EXTERN
void git_index_conflict_iterator_free(libgit2_d.types.git_index_conflict_iterator* iterator);

/** @} */