#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "abspath.h"

#include "parse.h"

#include "dir.h"

#include "environment.h"

#include "gettext.h"

#include "pathspec.h"

#include "attr.h"

#include "read-cache.h"

#include "repository.h"

#include "setup.h"

#include "strvec.h"

#include "symlinks.h"

#include "quote.h"

#include "wildmatch.h"

/*

 * Finds which of the given pathspecs match items in the index.

 *

 * For each pathspec, sets the corresponding entry in the seen[] array

 * (which should be specs items long, i.e. the same size as pathspec)

 * to the nature of the "closest" (i.e. most specific) match found for

 * that pathspec in the index, if it was a closer type of match than

 * the existing entry.  As an optimization, matching is skipped

 * altogether if seen[] already only contains non-zero entries.

 *

 * If seen[] has not already been written to, it may make sense

 * to use find_pathspecs_matching_against_index() instead.

 */

void add_pathspec_matches_against_index(const struct pathspec *pathspec,

          struct index_state *istate,

          char *seen,

          enum ps_skip_worktree_action sw_action)

{

  int num_unmatched = 0, i;

  /*

   * Since we are walking the index as if we were walking the directory,

   * we have to mark the matched pathspec as seen; otherwise we will

   * mistakenly think that the user gave a pathspec that did not match

   * anything.

   */

  for (i = 0; i < pathspec->nr; i++)

    if (!seen[i])

      num_unmatched++;

  if (!num_unmatched)

    return;

  for (i = 0; i < istate->cache_nr; i++) {

    const struct cache_entry *ce = istate->cache[i];

    if (sw_action == PS_IGNORE_SKIP_WORKTREE &&

        (ce_skip_worktree(ce) || !path_in_sparse_checkout(ce->name, istate)))

      continue;

    ce_path_match(istate, ce, pathspec, seen);

  }

}

/*

 * Finds which of the given pathspecs match items in the index.

 *

 * This is a one-shot wrapper around add_pathspec_matches_against_index()

 * which allocates, populates, and returns a seen[] array indicating the

 * nature of the "closest" (i.e. most specific) matches which each of the

 * given pathspecs achieves against all items in the index.

 */

char *find_pathspecs_matching_against_index(const struct pathspec *pathspec,

              struct index_state *istate,

              enum ps_skip_worktree_action sw_action)

{

  char *seen = xcalloc(pathspec->nr, 1);

  add_pathspec_matches_against_index(pathspec, istate, seen, sw_action);

  return seen;

}

char *find_pathspecs_matching_skip_worktree(const struct pathspec *pathspec)

{

  struct index_state *istate = the_repository->index;

  char *seen = xcalloc(pathspec->nr, 1);

  int i;

  for (i = 0; i < istate->cache_nr; i++) {

    struct cache_entry *ce = istate->cache[i];

    if (ce_skip_worktree(ce) || !path_in_sparse_checkout(ce->name, istate))

        ce_path_match(istate, ce, pathspec, seen);

  }

  return seen;

}

/*

 * Magic pathspec

 *

 * Possible future magic semantics include stuff like:

 *

 *  { PATHSPEC_RECURSIVE, '*', "recursive" },

 *  { PATHSPEC_REGEXP, '\0', "regexp" },

 *

 */

static struct pathspec_magic {

  unsigned bit;

  char mnemonic; /* this cannot be ':'! */

  const char *name;

} pathspec_magic[] = {

  { PATHSPEC_FROMTOP,  '/', "top" },

  { PATHSPEC_LITERAL, '\0', "literal" },

  { PATHSPEC_GLOB,    '\0', "glob" },

  { PATHSPEC_ICASE,   '\0', "icase" },

  { PATHSPEC_EXCLUDE,  '!', "exclude" },

  { PATHSPEC_ATTR,    '\0', "attr" },

};

static void prefix_magic(struct strbuf *sb, int prefixlen,

       unsigned magic, const char *element)

{

  /* No magic was found in element, just add prefix magic */

  if (!magic) {

    strbuf_addf(sb, ":(prefix:%d)", prefixlen);

    return;

  }

  /*

   * At this point, we know that parse_element_magic() was able

   * to extract some pathspec magic from element. So we know

   * element is correctly formatted in either shorthand or

   * longhand form

   */

  if (element[1] != '(') {

    /* Process an element in shorthand form (e.g. ":!/<match>") */

    strbuf_addstr(sb, ":(");

    for (int i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {

      if ((magic & pathspec_magic[i].bit) &&

          pathspec_magic[i].mnemonic) {

        if (sb->buf[sb->len - 1] != '(')

          strbuf_addch(sb, ',');

        strbuf_addstr(sb, pathspec_magic[i].name);

      }

    }

  } else {

    /* For the longhand form, we copy everything up to the final ')' */

    size_t len = strchr(element, ')') - element;

    strbuf_add(sb, element, len);

  }

  strbuf_addf(sb, ",prefix:%d)", prefixlen);

}

static size_t strcspn_escaped(const char *s, const char *stop)

{

  const char *i;

  for (i = s; *i; i++) {

    /* skip the escaped character */

    if (i[0] == '\\' && i[1]) {

      i++;

      continue;

    }

    if (strchr(stop, *i))

      break;

  }

  return i - s;

}

static inline int invalid_value_char(const char ch)

{

  if (isalnum(ch) || strchr(",-_", ch))

    return 0;

  return -1;

}

static char *attr_value_unescape(const char *value)

{

  const char *src;

  char *dst, *ret;

  ret = xmallocz(strlen(value));

  for (src = value, dst = ret; *src; src++, dst++) {

    if (*src == '\\') {

      if (!src[1])

        die(_("Escape character '\\' not allowed as "

              "last character in attr value"));

      src++;

    }

    if (invalid_value_char(*src))

      die("cannot use '%c' for value matching", *src);

    *dst = *src;

  }

  *dst = '\0';

  return ret;

}

static void parse_pathspec_attr_match(struct pathspec_item *item, const char *value)

{

  struct string_list_item *si;

  struct string_list list = STRING_LIST_INIT_DUP;

  if (item->attr_check || item->attr_match)

    die(_("Only one 'attr:' specification is allowed."));

  if (!value || !*value)

    die(_("attr spec must not be empty"));

  string_list_split(&list, value, ' ', -1);

  string_list_remove_empty_items(&list, 0);

  item->attr_check = attr_check_alloc();

  CALLOC_ARRAY(item->attr_match, list.nr);

  for_each_string_list_item(si, &list) {

    size_t attr_len;

    char *attr_name;

    const struct git_attr *a;

    int j = item->attr_match_nr++;

    const char *attr = si->string;

    struct attr_match *am = &item->attr_match[j];

    switch (*attr) {

    case '!':

      am->match_mode = MATCH_UNSPECIFIED;

      attr++;

      attr_len = strlen(attr);

      break;

    case '-':

      am->match_mode = MATCH_UNSET;

      attr++;

      attr_len = strlen(attr);

      break;

    default:

      attr_len = strcspn(attr, "=");

      if (attr[attr_len] != '=')

        am->match_mode = MATCH_SET;

      else {

        const char *v = &attr[attr_len + 1];

        am->match_mode = MATCH_VALUE;

        am->value = attr_value_unescape(v);

      }

      break;

    }

    attr_name = xmemdupz(attr, attr_len);

    a = git_attr(attr_name);

    if (!a)

      die(_("invalid attribute name %s"), attr_name);

    attr_check_append(item->attr_check, a);

    free(attr_name);

  }

  if (item->attr_check->nr != item->attr_match_nr)

    BUG("should have same number of entries");

  string_list_clear(&list, 0);

}

static inline int get_literal_global(void)

{

  static int literal = -1;

  if (literal < 0)

    literal = git_env_bool(GIT_LITERAL_PATHSPECS_ENVIRONMENT, 0);

  return literal;

}

static inline int get_glob_global(void)

{

  static int glob = -1;

  if (glob < 0)

    glob = git_env_bool(GIT_GLOB_PATHSPECS_ENVIRONMENT, 0);

  return glob;

}

static inline int get_noglob_global(void)

{

  static int noglob = -1;

  if (noglob < 0)

    noglob = git_env_bool(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, 0);

  return noglob;

}

static inline int get_icase_global(void)

{

  static int icase = -1;

  if (icase < 0)

    icase = git_env_bool(GIT_ICASE_PATHSPECS_ENVIRONMENT, 0);

  return icase;

}

static int get_global_magic(int element_magic)

{

  int global_magic = 0;

  if (get_literal_global())

    global_magic |= PATHSPEC_LITERAL;

  /* --glob-pathspec is overridden by :(literal) */

  if (get_glob_global() && !(element_magic & PATHSPEC_LITERAL))

    global_magic |= PATHSPEC_GLOB;

  if (get_glob_global() && get_noglob_global())

    die(_("global 'glob' and 'noglob' pathspec settings are incompatible"));

  if (get_icase_global())

    global_magic |= PATHSPEC_ICASE;

  if ((global_magic & PATHSPEC_LITERAL) &&

      (global_magic & ~PATHSPEC_LITERAL))

    die(_("global 'literal' pathspec setting is incompatible "

          "with all other global pathspec settings"));

  /* --noglob-pathspec adds :(literal) _unless_ :(glob) is specified */

  if (get_noglob_global() && !(element_magic & PATHSPEC_GLOB))

    global_magic |= PATHSPEC_LITERAL;

  return global_magic;

}

/*

 * Parse the pathspec element looking for long magic

 *

 * saves all magic in 'magic'

 * if prefix magic is used, save the prefix length in 'prefix_len'

 * returns the position in 'elem' after all magic has been parsed

 */

static const char *parse_long_magic(unsigned *magic, int *prefix_len,

            struct pathspec_item *item,

            const char *elem)

{

  const char *pos;

  const char *nextat;

  for (pos = elem + 2; *pos && *pos != ')'; pos = nextat) {

    size_t len = strcspn_escaped(pos, ",)");

    int i;

    if (pos[len] == ',')

      nextat = pos + len + 1; /* handle ',' */

    else

      nextat = pos + len; /* handle ')' and '\0' */

    if (!len)

      continue;

    if (starts_with(pos, "prefix:")) {

      char *endptr;

      *prefix_len = strtol(pos + 7, &endptr, 10);

      if (endptr - pos != len)

        die(_("invalid parameter for pathspec magic 'prefix'"));

      continue;

    }

    if (starts_with(pos, "attr:")) {

      char *attr_body = xmemdupz(pos + 5, len - 5);

      parse_pathspec_attr_match(item, attr_body);

      *magic |= PATHSPEC_ATTR;

      free(attr_body);

      continue;

    }

    for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {

      if (strlen(pathspec_magic[i].name) == len &&

          !strncmp(pathspec_magic[i].name, pos, len)) {

        *magic |= pathspec_magic[i].bit;

        break;

      }

    }

    if (ARRAY_SIZE(pathspec_magic) <= i)

      die(_("Invalid pathspec magic '%.*s' in '%s'"),

          (int) len, pos, elem);

  }

  if (*pos != ')')

    die(_("Missing ')' at the end of pathspec magic in '%s'"),

        elem);

  pos++;

  return pos;

}

/*

 * Parse the pathspec element looking for short magic

 *

 * saves all magic in 'magic'

 * returns the position in 'elem' after all magic has been parsed

 */

static const char *parse_short_magic(unsigned *magic, const char *elem)

{

  const char *pos;

  for (pos = elem + 1; *pos && *pos != ':'; pos++) {

    char ch = *pos;

    int i;

    /* Special case alias for '!' */

    if (ch == '^') {

      *magic |= PATHSPEC_EXCLUDE;

      continue;

    }

    if (!is_pathspec_magic(ch))

      break;

    for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {

      if (pathspec_magic[i].mnemonic == ch) {

        *magic |= pathspec_magic[i].bit;

        break;

      }

    }

    if (ARRAY_SIZE(pathspec_magic) <= i)

      die(_("Unimplemented pathspec magic '%c' in '%s'"),

          ch, elem);

  }

  if (*pos == ':')

    pos++;

  return pos;

}

static const char *parse_element_magic(unsigned *magic, int *prefix_len,

               struct pathspec_item *item,

               const char *elem)

{

  if (elem[0] != ':' || get_literal_global())

    return elem; /* nothing to do */

  else if (elem[1] == '(')

    /* longhand */

    return parse_long_magic(magic, prefix_len, item, elem);

  else

    /* shorthand */

    return parse_short_magic(magic, elem);

}

/*

 * Perform the initialization of a pathspec_item based on a pathspec element.

 */

static void init_pathspec_item(struct pathspec_item *item, unsigned flags,

             const char *prefix, int prefixlen,

             const char *elt)

{

  unsigned magic = 0, element_magic = 0;

  const char *copyfrom = elt;

  char *match;

  int pathspec_prefix = -1;

  item->attr_check = NULL;

  item->attr_match = NULL;

  item->attr_match_nr = 0;

  /* PATHSPEC_LITERAL_PATH ignores magic */

  if (flags & PATHSPEC_LITERAL_PATH) {

    magic = PATHSPEC_LITERAL;

  } else {

    copyfrom = parse_element_magic(&element_magic,

                 &pathspec_prefix,

                 item,

                 elt);

    magic |= element_magic;

    magic |= get_global_magic(element_magic);

  }

  item->magic = magic;

  if (pathspec_prefix >= 0 &&

      (prefixlen || (prefix && *prefix)))

    BUG("'prefix' magic is supposed to be used at worktree's root");

  if ((magic & PATHSPEC_LITERAL) && (magic & PATHSPEC_GLOB))

    die(_("%s: 'literal' and 'glob' are incompatible"), elt);

  /* Create match string which will be used for pathspec matching */

  if (pathspec_prefix >= 0) {

    match = xstrdup(copyfrom);

    prefixlen = pathspec_prefix;

  } else if (magic & PATHSPEC_FROMTOP) {

    match = xstrdup(copyfrom);

    prefixlen = 0;

  } else {

    match = prefix_path_gently(prefix, prefixlen,

             &prefixlen, copyfrom);

    if (!match) {

      const char *hint_path;

      if (!have_git_dir())

        die(_("'%s' is outside the directory tree"),

            copyfrom);

      hint_path = get_git_work_tree();

      if (!hint_path)

        hint_path = get_git_dir();

      die(_("%s: '%s' is outside repository at '%s'"), elt,

          copyfrom, absolute_path(hint_path));

    }

  }

  item->match = match;

  item->len = strlen(item->match);

  item->prefix = prefixlen;

  /*

   * Prefix the pathspec (keep all magic) and assign to

   * original. Useful for passing to another command.

   */

  if ((flags & PATHSPEC_PREFIX_ORIGIN) &&

      !get_literal_global()) {

    struct strbuf sb = STRBUF_INIT;

    /* Preserve the actual prefix length of each pattern */

    prefix_magic(&sb, prefixlen, element_magic, elt);

    strbuf_addstr(&sb, match);

    item->original = strbuf_detach(&sb, NULL);

  } else {

    item->original = xstrdup(elt);

  }

  if (magic & PATHSPEC_LITERAL) {

    item->nowildcard_len = item->len;

  } else {

    item->nowildcard_len = simple_length(item->match);

    if (item->nowildcard_len < prefixlen)

      item->nowildcard_len = prefixlen;

  }

  item->flags = 0;

  if (magic & PATHSPEC_GLOB) {

    /*

     * FIXME: should we enable ONESTAR in _GLOB for

     * pattern "* * / * . c"?

     */

  } else {

    if (item->nowildcard_len < item->len &&

        item->match[item->nowildcard_len] == '*' &&

        no_wildcard(item->match + item->nowildcard_len + 1))

      item->flags |= PATHSPEC_ONESTAR;

  }

  /* sanity checks, pathspec matchers assume these are sane */

  if (item->nowildcard_len > item->len ||

      item->prefix         > item->len) {

    BUG("error initializing pathspec_item");

  }

}

static int pathspec_item_cmp(const void *a_, const void *b_)

{

  struct pathspec_item *a, *b;

  a = (struct pathspec_item *)a_;

  b = (struct pathspec_item *)b_;

  return strcmp(a->match, b->match);

}

void pathspec_magic_names(unsigned magic, struct strbuf *out)

{

  int i;

  for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++) {

    const struct pathspec_magic *m = pathspec_magic + i;

    if (!(magic & m->bit))

      continue;

    if (out->len)

      strbuf_addstr(out, ", ");

    if (m->mnemonic)

      strbuf_addf(out, _("'%s' (mnemonic: '%c')"),

            m->name, m->mnemonic);

    else

      strbuf_addf(out, "'%s'", m->name);

  }

}

static void NORETURN unsupported_magic(const char *pattern,

               unsigned magic)

{

  struct strbuf sb = STRBUF_INIT;

  pathspec_magic_names(magic, &sb);

  /*

   * We may want to substitute "this command" with a command

   * name. E.g. when "git add -p" or "git add -i" dies when running

   * "checkout -p"

   */

  die(_("%s: pathspec magic not supported by this command: %s"),

      pattern, sb.buf);

}

void parse_pathspec(struct pathspec *pathspec,

        unsigned magic_mask, unsigned flags,

        const char *prefix, const char **argv)

{

  struct pathspec_item *item;

  const char *entry = argv ? *argv : NULL;

  int i, n, prefixlen, nr_exclude = 0;

  memset(pathspec, 0, sizeof(*pathspec));

  if (flags & PATHSPEC_MAXDEPTH_VALID)

    pathspec->magic |= PATHSPEC_MAXDEPTH;

  /* No arguments, no prefix -> no pathspec */

  if (!entry && !prefix)

    return;

  if ((flags & PATHSPEC_PREFER_CWD) &&

      (flags & PATHSPEC_PREFER_FULL))

    BUG("PATHSPEC_PREFER_CWD and PATHSPEC_PREFER_FULL are incompatible");

  /* No arguments with prefix -> prefix pathspec */

  if (!entry) {

    if (flags & PATHSPEC_PREFER_FULL)

      return;

    if (!(flags & PATHSPEC_PREFER_CWD))

      BUG("PATHSPEC_PREFER_CWD requires arguments");

    pathspec->items = CALLOC_ARRAY(item, 1);

    item->match = xstrdup(prefix);

    item->original = xstrdup(prefix);

    item->nowildcard_len = item->len = strlen(prefix);

    item->prefix = item->len;

    pathspec->nr = 1;

    return;

  }

  n = 0;

  while (argv[n]) {

    if (*argv[n] == '\0')

      die("empty string is not a valid pathspec. "

          "please use . instead if you meant to match all paths");

    n++;

  }

  pathspec->nr = n;

  ALLOC_ARRAY(pathspec->items, n + 1);

  item = pathspec->items;

  prefixlen = prefix ? strlen(prefix) : 0;

  for (i = 0; i < n; i++) {

    entry = argv[i];

    init_pathspec_item(item + i, flags, prefix, prefixlen, entry);

    if (item[i].magic & PATHSPEC_EXCLUDE)

      nr_exclude++;

    if (item[i].magic & magic_mask)

      unsupported_magic(entry, item[i].magic & magic_mask);

    if ((flags & PATHSPEC_SYMLINK_LEADING_PATH) &&

        has_symlink_leading_path(item[i].match, item[i].len)) {

      die(_("pathspec '%s' is beyond a symbolic link"), entry);

    }

    if (item[i].nowildcard_len < item[i].len)

      pathspec->has_wildcard = 1;

    pathspec->magic |= item[i].magic;

  }

  /*

   * If everything is an exclude pattern, add one positive pattern

   * that matches everything. We allocated an extra one for this.

   */

  if (nr_exclude == n) {

    int plen = (!(flags & PATHSPEC_PREFER_CWD)) ? 0 : prefixlen;

    init_pathspec_item(item + n, 0, prefix, plen, ".");

    pathspec->nr++;

  }

  if (pathspec->magic & PATHSPEC_MAXDEPTH) {

    if (flags & PATHSPEC_KEEP_ORDER)

      BUG("PATHSPEC_MAXDEPTH_VALID and PATHSPEC_KEEP_ORDER are incompatible");

    QSORT(pathspec->items, pathspec->nr, pathspec_item_cmp);

  }

}

void parse_pathspec_file(struct pathspec *pathspec, unsigned magic_mask,

       unsigned flags, const char *prefix,

       const char *file, int nul_term_line)

{

  struct strvec parsed_file = STRVEC_INIT;

  strbuf_getline_fn getline_fn = nul_term_line ? strbuf_getline_nul :

                   strbuf_getline;

  struct strbuf buf = STRBUF_INIT;

  struct strbuf unquoted = STRBUF_INIT;

  FILE *in;

  if (!strcmp(file, "-"))

    in = stdin;

  else

    in = xfopen(file, "r");

  while (getline_fn(&buf, in) != EOF) {

    if (!nul_term_line && buf.buf[0] == '"') {

      strbuf_reset(&unquoted);

      if (unquote_c_style(&unquoted, buf.buf, NULL))

        die(_("line is badly quoted: %s"), buf.buf);

      strbuf_swap(&buf, &unquoted);

    }

    strvec_push(&parsed_file, buf.buf);

    strbuf_reset(&buf);

  }

  strbuf_release(&unquoted);

  strbuf_release(&buf);

  if (in != stdin)

    fclose(in);

  parse_pathspec(pathspec, magic_mask, flags, prefix, parsed_file.v);

  strvec_clear(&parsed_file);

}

void copy_pathspec(struct pathspec *dst, const struct pathspec *src)

{

  int i, j;

  *dst = *src;

  DUP_ARRAY(dst->items, src->items, dst->nr);

  for (i = 0; i < dst->nr; i++) {

    struct pathspec_item *d = &dst->items[i];

    struct pathspec_item *s = &src->items[i];

    d->match = xstrdup(s->match);

    d->original = xstrdup(s->original);

    DUP_ARRAY(d->attr_match, s->attr_match, d->attr_match_nr);

    for (j = 0; j < d->attr_match_nr; j++) {

      const char *value = s->attr_match[j].value;

      d->attr_match[j].value = xstrdup_or_null(value);

    }

    d->attr_check = attr_check_dup(s->attr_check);

  }

}

void clear_pathspec(struct pathspec *pathspec)

{

  int i, j;

  for (i = 0; i < pathspec->nr; i++) {

    free(pathspec->items[i].match);

    free(pathspec->items[i].original);

    for (j = 0; j < pathspec->items[i].attr_match_nr; j++)

      free(pathspec->items[i].attr_match[j].value);

    free(pathspec->items[i].attr_match);

    if (pathspec->items[i].attr_check)

      attr_check_free(pathspec->items[i].attr_check);

  }

  FREE_AND_NULL(pathspec->items);

  pathspec->nr = 0;

}

int match_pathspec_attrs(struct index_state *istate,

       const char *name, int namelen,

       const struct pathspec_item *item)

{

  int i;

  char *to_free = NULL;

  if (name[namelen])

    name = to_free = xmemdupz(name, namelen);

  git_check_attr(istate, name, item->attr_check);

  free(to_free);

  for (i = 0; i < item->attr_match_nr; i++) {

    const char *value;

    int matched;

    enum attr_match_mode match_mode;

    value = item->attr_check->items[i].value;

    match_mode = item->attr_match[i].match_mode;

    if (ATTR_TRUE(value))

      matched = (match_mode == MATCH_SET);

    else if (ATTR_FALSE(value))

      matched = (match_mode == MATCH_UNSET);

    else if (ATTR_UNSET(value))

      matched = (match_mode == MATCH_UNSPECIFIED);

    else

      matched = (match_mode == MATCH_VALUE &&

           !strcmp(item->attr_match[i].value, value));

    if (!matched)

      return 0;

  }

  return 1;

}

int pathspec_needs_expanded_index(struct index_state *istate,

          const struct pathspec *pathspec)

{

  unsigned int i, pos;

  int res = 0;

  char *skip_worktree_seen = NULL;

  /*

   * If index is not sparse, no index expansion is needed.

   */

  if (!istate->sparse_index)

    return 0;

  /*

   * When using a magic pathspec, assume for the sake of simplicity that

   * the index needs to be expanded to match all matchable files.

   */

  if (pathspec->magic)

    return 1;

  for (i = 0; i < pathspec->nr; i++) {

    struct pathspec_item item = pathspec->items[i];

    /*

     * If the pathspec item has a wildcard, the index should be expanded

     * if the pathspec has the possibility of matching a subset of entries inside

     * of a sparse directory (but not the entire directory).

     *

     * If the pathspec item is a literal path, the index only needs to be expanded

     * if a) the pathspec isn't in the sparse checkout cone (to make sure we don't

     * expand for in-cone files) and b) it doesn't match any sparse directories

     * (since we can reset whole sparse directories without expanding them).

     */

    if (item.nowildcard_len < item.len) {

      /*

       * Special case: if the pattern is a path inside the cone

       * followed by only wildcards, the pattern cannot match

       * partial sparse directories, so we know we don't need to

       * expand the index.

       *

       * Examples:

       * - in-cone/foo***: doesn't need expanded index

       * - not-in-cone/bar*: may need expanded index

       * - **.c: may need expanded index

       */

      if (strspn(item.original + item.nowildcard_len, "*") == item.len - item.nowildcard_len &&

          path_in_cone_mode_sparse_checkout(item.original, istate))

        continue;

      for (pos = 0; pos < istate->cache_nr; pos++) {

        struct cache_entry *ce = istate->cache[pos];

        if (!S_ISSPARSEDIR(ce->ce_mode))

          continue;

        /*

         * If the pre-wildcard length is longer than the sparse

         * directory name and the sparse directory is the first

         * component of the pathspec, need to expand the index.

         */

        if (item.nowildcard_len > ce_namelen(ce) &&

            !strncmp(item.original, ce->name, ce_namelen(ce))) {

          res = 1;

          break;

        }

        /*

         * If the pre-wildcard length is shorter than the sparse

         * directory and the pathspec does not match the whole

         * directory, need to expand the index.

         */

        if (!strncmp(item.original, ce->name, item.nowildcard_len) &&

            wildmatch(item.original, ce->name, 0)) {

          res = 1;

          break;

        }

      }

    } else if (!path_in_cone_mode_sparse_checkout(item.original, istate) &&