#ifndef DIR_H
#define DIR_H

/* See Documentation/technical/api-directory-listing.txt */

#include "strbuf.h"

struct dir_entry {
        unsigned int len;
        char name[FLEX_ARRAY]; /* more */
};

#define EXC_FLAG_NODIR 1
#define EXC_FLAG_ENDSWITH 4
#define EXC_FLAG_MUSTBEDIR 8
#define EXC_FLAG_NEGATIVE 16

struct exclude {
        /*
         * This allows callers of last_exclude_matching() etc.
         * to determine the origin of the matching pattern.
         */
        struct exclude_list *el;

        const char *pattern;
        int patternlen;
        int nowildcardlen;
        const char *base;
        int baselen;
        unsigned flags;         /* EXC_FLAG_* */

        /*
         * Counting starts from 1 for line numbers in ignore files,
         * and from -1 decrementing for patterns from CLI args.
         */
        int srcpos;
};

/*
 * Each excludes file will be parsed into a fresh exclude_list which
 * is appended to the relevant exclude_list_group (either EXC_DIRS or
 * EXC_FILE).  An exclude_list within the EXC_CMDL exclude_list_group
 * can also be used to represent the list of --exclude values passed
 * via CLI args.
 */
struct exclude_list {
        int nr;
        int alloc;

        /* remember pointer to exclude file contents so we can free() */
        char *filebuf;

        /* origin of list, e.g. path to filename, or descriptive string */
        const char *src;

        struct exclude **excludes;
};

/*
 * The contents of the per-directory exclude files are lazily read on
 * demand and then cached in memory, one per exclude_stack struct, in
 * order to avoid opening and parsing each one every time that
 * directory is traversed.
 */
struct exclude_stack {
        struct exclude_stack *prev; /* the struct exclude_stack for the parent directory */
        int baselen;
        int exclude_ix; /* index of exclude_list within EXC_DIRS exclude_list_group */
        struct untracked_cache_dir *ucd;
};

struct exclude_list_group {
        int nr, alloc;
        struct exclude_list *el;
};

struct sha1_stat {
        struct stat_data stat;
        unsigned char sha1[20];
        int valid;
};

/*
 *  Untracked cache
 *
 *  The following inputs are sufficient to determine what files in a
 *  directory are excluded:
 *
 *   - The list of files and directories of the directory in question
 *   - The $GIT_DIR/index
 *   - dir_struct flags
 *   - The content of $GIT_DIR/info/exclude
 *   - The content of core.excludesfile
 *   - The content (or the lack) of .gitignore of all parent directories
 *     from $GIT_WORK_TREE
 *   - The check_only flag in read_directory_recursive (for
 *     DIR_HIDE_EMPTY_DIRECTORIES)
 *
 *  The first input can be checked using directory mtime. In many
 *  filesystems, directory mtime (stat_data field) is updated when its
 *  files or direct subdirs are added or removed.
 *
 *  The second one can be hooked from cache_tree_invalidate_path().
 *  Whenever a file (or a submodule) is added or removed from a
 *  directory, we invalidate that directory.
 *
 *  The remaining inputs are easy, their SHA-1 could be used to verify
 *  their contents (exclude_sha1[], info_exclude_sha1[] and
 *  excludes_file_sha1[])
 */
struct untracked_cache_dir {
        struct untracked_cache_dir **dirs;
        char **untracked;
        struct stat_data stat_data;
        unsigned int untracked_alloc, dirs_nr, dirs_alloc;
        unsigned int untracked_nr;
        unsigned int check_only : 1;
        /* all data except 'dirs' in this struct are good */
        unsigned int valid : 1;
        unsigned int recurse : 1;
        /* null SHA-1 means this directory does not have .gitignore */
        unsigned char exclude_sha1[20];
        char name[FLEX_ARRAY];
};

struct untracked_cache {
        struct sha1_stat ss_info_exclude;
        struct sha1_stat ss_excludes_file;
        const char *exclude_per_dir;
        struct strbuf ident;
        /*
         * dir_struct#flags must match dir_flags or the untracked
         * cache is ignored.
         */
        unsigned dir_flags;
        struct untracked_cache_dir *root;
        /* Statistics */
        int dir_created;
        int gitignore_invalidated;
        int dir_invalidated;
        int dir_opened;
};

struct dir_struct {
        int nr, alloc;
        int ignored_nr, ignored_alloc;
        enum {
                DIR_SHOW_IGNORED = 1<<0,
                DIR_SHOW_OTHER_DIRECTORIES = 1<<1,
                DIR_HIDE_EMPTY_DIRECTORIES = 1<<2,
                DIR_NO_GITLINKS = 1<<3,
                DIR_COLLECT_IGNORED = 1<<4,
                DIR_SHOW_IGNORED_TOO = 1<<5,
                DIR_COLLECT_KILLED_ONLY = 1<<6
        } flags;
        struct dir_entry **entries;
        struct dir_entry **ignored;

        /* Exclude info */
        const char *exclude_per_dir;

        /*
         * We maintain three groups of exclude pattern lists:
         *
         * EXC_CMDL lists patterns explicitly given on the command line.
         * EXC_DIRS lists patterns obtained from per-directory ignore files.
         * EXC_FILE lists patterns from fallback ignore files, e.g.
         *   - .git/info/exclude
         *   - core.excludesfile
         *
         * Each group contains multiple exclude lists, a single list
         * per source.
         */
#define EXC_CMDL 0
#define EXC_DIRS 1
#define EXC_FILE 2
        struct exclude_list_group exclude_list_group[3];

        /*
         * Temporary variables which are used during loading of the
         * per-directory exclude lists.
         *
         * exclude_stack points to the top of the exclude_stack, and
         * basebuf contains the full path to the current
         * (sub)directory in the traversal. Exclude points to the
         * matching exclude struct if the directory is excluded.
         */
        struct exclude_stack *exclude_stack;
        struct exclude *exclude;
        struct strbuf basebuf;

        /* Enable untracked file cache if set */
        struct untracked_cache *untracked;
        struct sha1_stat ss_info_exclude;
        struct sha1_stat ss_excludes_file;
        unsigned unmanaged_exclude_files;
};

/*
 * The ordering of these constants is significant, with
 * higher-numbered match types signifying "closer" (i.e. more
 * specific) matches which will override lower-numbered match types
 * when populating the seen[] array.
 */
#define MATCHED_RECURSIVELY 1
#define MATCHED_FNMATCH 2
#define MATCHED_EXACTLY 3
extern int simple_length(const char *match);
extern int no_wildcard(const char *string);
extern char *common_prefix(const struct pathspec *pathspec);
extern int match_pathspec(const struct pathspec *pathspec,
                          const char *name, int namelen,
                          int prefix, char *seen, int is_dir);
extern int report_path_error(const char *ps_matched, const struct pathspec *pathspec, const char *prefix);
extern int within_depth(const char *name, int namelen, int depth, int max_depth);

extern int fill_directory(struct dir_struct *dir, const struct pathspec *pathspec);
extern int read_directory(struct dir_struct *, const char *path, int len, const struct pathspec *pathspec);

extern int is_excluded_from_list(const char *pathname, int pathlen, const char *basename,
                                 int *dtype, struct exclude_list *el);
struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len);

/*
 * these implement the matching logic for dir.c:excluded_from_list and
 * attr.c:path_matches()
 */
extern int match_basename(const char *, int,
                          const char *, int, int, unsigned);
extern int match_pathname(const char *, int,
                          const char *, int,
                          const char *, int, int, unsigned);

extern struct exclude *last_exclude_matching(struct dir_struct *dir,
                                             const char *name, int *dtype);

extern int is_excluded(struct dir_struct *dir, const char *name, int *dtype);

extern struct exclude_list *add_exclude_list(struct dir_struct *dir,
                                             int group_type, const char *src);
extern int add_excludes_from_file_to_list(const char *fname, const char *base, int baselen,
                                          struct exclude_list *el, int check_index);
extern void add_excludes_from_file(struct dir_struct *, const char *fname);
extern void parse_exclude_pattern(const char **string, int *patternlen, unsigned *flags, int *nowildcardlen);
extern void add_exclude(const char *string, const char *base,
                        int baselen, struct exclude_list *el, int srcpos);
extern void clear_exclude_list(struct exclude_list *el);
extern void clear_directory(struct dir_struct *dir);
extern int file_exists(const char *);

extern int is_inside_dir(const char *dir);
extern int dir_inside_of(const char *subdir, const char *dir);

static inline int is_dot_or_dotdot(const char *name)
{
        return (name[0] == '.' &&
                (name[1] == '\0' ||
                 (name[1] == '.' && name[2] == '\0')));
}

extern int is_empty_dir(const char *dir);

extern void setup_standard_excludes(struct dir_struct *dir);


/* Constants for remove_dir_recursively: */

/*
 * If a non-directory is found within path, stop and return an error.
 * (In this case some empty directories might already have been
 * removed.)
 */
#define REMOVE_DIR_EMPTY_ONLY 01

/*
 * If any Git work trees are found within path, skip them without
 * considering it an error.
 */
#define REMOVE_DIR_KEEP_NESTED_GIT 02

/* Remove the contents of path, but leave path itself. */
#define REMOVE_DIR_KEEP_TOPLEVEL 04

/*
 * Remove path and its contents, recursively. flags is a combination
 * of the above REMOVE_DIR_* constants. Return 0 on success.
 *
 * This function uses path as temporary scratch space, but restores it
 * before returning.
 */
extern int remove_dir_recursively(struct strbuf *path, int flag);

/* tries to remove the path with empty directories along it, ignores ENOENT */
extern int remove_path(const char *path);

extern int fspathcmp(const char *a, const char *b);
extern int fspathncmp(const char *a, const char *b, size_t count);

/*
 * The prefix part of pattern must not contains wildcards.
 */
struct pathspec_item;
extern int git_fnmatch(const struct pathspec_item *item,
                       const char *pattern, const char *string,
                       int prefix);

static inline int ce_path_match(const struct cache_entry *ce,
                                const struct pathspec *pathspec,
                                char *seen)
{
        return match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen,
                              S_ISDIR(ce->ce_mode) || S_ISGITLINK(ce->ce_mode));
}

static inline int dir_path_match(const struct dir_entry *ent,
                                 const struct pathspec *pathspec,
                                 int prefix, char *seen)
{
        int has_trailing_dir = ent->len && ent->name[ent->len - 1] == '/';
        int len = has_trailing_dir ? ent->len - 1 : ent->len;
        return match_pathspec(pathspec, ent->name, len, prefix, seen,
                              has_trailing_dir);
}

void untracked_cache_invalidate_path(struct index_state *, const char *);
void untracked_cache_remove_from_index(struct index_state *, const char *);
void untracked_cache_add_to_index(struct index_state *, const char *);

void free_untracked_cache(struct untracked_cache *);
struct untracked_cache *read_untracked_extension(const void *data, unsigned long sz);
void write_untracked_extension(struct strbuf *out, struct untracked_cache *untracked);
void add_untracked_cache(struct index_state *istate);
void remove_untracked_cache(struct index_state *istate);
#endif