#include "builtin.h"

#include "config.h"

#include "dir.h"

#include "gettext.h"

#include "quote.h"

#include "pathspec.h"

#include "parse-options.h"

#include "repository.h"

#include "submodule.h"

#include "write-or-die.h"

static int quiet, verbose, stdin_paths, show_non_matching, no_index;

static const char * const check_ignore_usage[] = {

"git check-ignore [<options>] <pathname>...",

"git check-ignore [<options>] --stdin",

NULL

};

static int nul_term_line;

static const struct option check_ignore_options[] = {

  OPT__QUIET(&quiet, N_("suppress progress reporting")),

  OPT__VERBOSE(&verbose, N_("be verbose")),

  OPT_GROUP(""),

  OPT_BOOL(0, "stdin", &stdin_paths,

     N_("read file names from stdin")),

  OPT_BOOL('z', NULL, &nul_term_line,

     N_("terminate input and output records by a NUL character")),

  OPT_BOOL('n', "non-matching", &show_non_matching,

     N_("show non-matching input paths")),

  OPT_BOOL(0, "no-index", &no_index,

     N_("ignore index when checking")),

  OPT_END()

};

static void output_pattern(const char *path, struct path_pattern *pattern)

{

  const char *bang  = (pattern && pattern->flags & PATTERN_FLAG_NEGATIVE)  ? "!" : "";

  const char *slash = (pattern && pattern->flags & PATTERN_FLAG_MUSTBEDIR) ? "/" : "";

  if (!nul_term_line) {

    if (!verbose) {

      write_name_quoted(path, stdout, '\n');

    } else {

      if (pattern) {

        quote_c_style(pattern->pl->src, NULL, stdout, 0);

        printf(":%d:%s%s%s\t",

               pattern->srcpos,

               bang, pattern->pattern, slash);

      }

      else {

        printf("::\t");

      }

      quote_c_style(path, NULL, stdout, 0);

      fputc('\n', stdout);

    }

  } else {

    if (!verbose) {

      printf("%s%c", path, '\0');

    } else {

      if (pattern)

        printf("%s%c%d%c%s%s%s%c%s%c",

               pattern->pl->src, '\0',

               pattern->srcpos, '\0',

               bang, pattern->pattern, slash, '\0',

               path, '\0');

      else

        printf("%c%c%c%s%c", '\0', '\0', '\0', path, '\0');

    }

  }

}

static int check_ignore(struct dir_struct *dir,

      const char *prefix, int argc, const char **argv)

{

  const char *full_path;

  char *seen;

  int num_ignored = 0, i;

  struct path_pattern *pattern;

  struct pathspec pathspec;

  if (!argc) {

    if (!quiet)

      fprintf(stderr, "no pathspec given.\n");

    return 0;

  }

  /*

   * check-ignore just needs paths. Magic beyond :/ is really

   * irrelevant.

   */

  parse_pathspec(&pathspec,

           PATHSPEC_ALL_MAGIC & ~PATHSPEC_FROMTOP,

           PATHSPEC_SYMLINK_LEADING_PATH |

           PATHSPEC_KEEP_ORDER,

           prefix, argv);

  die_path_inside_submodule(the_repository->index, &pathspec);

  /*

   * look for pathspecs matching entries in the index, since these

   * should not be ignored, in order to be consistent with

   * 'git status', 'git add' etc.

   */

  seen = find_pathspecs_matching_against_index(&pathspec, the_repository->index,

                 PS_HEED_SKIP_WORKTREE);

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

    full_path = pathspec.items[i].match;

    pattern = NULL;

    if (!seen[i]) {

      int dtype = DT_UNKNOWN;

      pattern = last_matching_pattern(dir, the_repository->index,

              full_path, &dtype);

      if (!verbose && pattern &&

          pattern->flags & PATTERN_FLAG_NEGATIVE)

        pattern = NULL;

    }

    if (!quiet && (pattern || show_non_matching))

      output_pattern(pathspec.items[i].original, pattern);

    if (pattern)

      num_ignored++;

  }

  free(seen);

  clear_pathspec(&pathspec);

  return num_ignored;

}

static int check_ignore_stdin_paths(struct dir_struct *dir, const char *prefix)

{

  struct strbuf buf = STRBUF_INIT;

  struct strbuf unquoted = STRBUF_INIT;

  char *pathspec[2] = { NULL, NULL };

  strbuf_getline_fn getline_fn;

  int num_ignored = 0;

  getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;

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

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

      strbuf_reset(&unquoted);

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

        die("line is badly quoted");

      strbuf_swap(&buf, &unquoted);

    }

    pathspec[0] = buf.buf;

    num_ignored += check_ignore(dir, prefix,

              1, (const char **)pathspec);

    maybe_flush_or_die(stdout, "check-ignore to stdout");

  }

  strbuf_release(&buf);

  strbuf_release(&unquoted);

  return num_ignored;

}

int cmd_check_ignore(int argc, const char **argv, const char *prefix)

{

  int num_ignored;

  struct dir_struct dir = DIR_INIT;

  git_config(git_default_config, NULL);

  argc = parse_options(argc, argv, prefix, check_ignore_options,

           check_ignore_usage, 0);

  if (stdin_paths) {

    if (argc > 0)

      die(_("cannot specify pathnames with --stdin"));

  } else {

    if (nul_term_line)

      die(_("-z only makes sense with --stdin"));

    if (argc == 0)

      die(_("no path specified"));

  }

  if (quiet) {

    if (argc > 1)

      die(_("--quiet is only valid with a single pathname"));

    if (verbose)

      die(_("cannot have both --quiet and --verbose"));

  }

  if (show_non_matching && !verbose)

    die(_("--non-matching is only valid with --verbose"));

  /* read_cache() is only necessary so we can watch out for submodules. */

  if (!no_index && repo_read_index(the_repository) < 0)

    die(_("index file corrupt"));

  setup_standard_excludes(&dir);

  if (stdin_paths) {

    num_ignored = check_ignore_stdin_paths(&dir, prefix);

  } else {

    num_ignored = check_ignore(&dir, prefix, argc, argv);

    maybe_flush_or_die(stdout, "ignore to stdout");

  }

  dir_clear(&dir);

  return !num_ignored;

}