#include "builtin.h"
#include "cache.h"
#include "dir.h"
#include "quote.h"
#include "pathspec.h"
#include "parse-options.h"

static int quiet, verbose, stdin_paths, show_non_matching;
static const char * const check_ignore_usage[] = {
"git check-ignore [options] pathname...",
"git check-ignore [options] --stdin < <list-of-paths>",
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_END()
};

static void output_exclude(const char *path, struct exclude *exclude)
{
        char *bang  = (exclude && exclude->flags & EXC_FLAG_NEGATIVE)  ? "!" : "";
        char *slash = (exclude && exclude->flags & EXC_FLAG_MUSTBEDIR) ? "/" : "";
        if (!nul_term_line) {
                if (!verbose) {
                        write_name_quoted(path, stdout, '\n');
                } else {
                        if (exclude) {
                                quote_c_style(exclude->el->src, NULL, stdout, 0);
                                printf(":%d:%s%s%s\t",
                                       exclude->srcpos,
                                       bang, exclude->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 (exclude)
                                printf("%s%c%d%c%s%s%s%c%s%c",
                                       exclude->el->src, '\0',
                                       exclude->srcpos, '\0',
                                       bang, exclude->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, dtype = DT_UNKNOWN, i;
        struct exclude *exclude;
        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_STRIP_SUBMODULE_SLASH_EXPENSIVE |
                       PATHSPEC_KEEP_ORDER,
                       prefix, argv);

        /*
         * 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);
        for (i = 0; i < pathspec.nr; i++) {
                full_path = pathspec.items[i].match;
                exclude = NULL;
                if (!seen[i]) {
                        exclude = last_exclude_matching(dir, full_path, &dtype);
                }
                if (!quiet && (exclude || show_non_matching))
                        output_exclude(pathspec.items[i].original, exclude);
                if (exclude)
                        num_ignored++;
        }
        free(seen);

        return num_ignored;
}

static int check_ignore_stdin_paths(struct dir_struct *dir, const char *prefix)
{
        struct strbuf buf, nbuf;
        char *pathspec[2] = { NULL, NULL };
        int line_termination = nul_term_line ? 0 : '\n';
        int num_ignored = 0;

        strbuf_init(&buf, 0);
        strbuf_init(&nbuf, 0);
        while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
                if (line_termination && buf.buf[0] == '"') {
                        strbuf_reset(&nbuf);
                        if (unquote_c_style(&nbuf, buf.buf, NULL))
                                die("line is badly quoted");
                        strbuf_swap(&buf, &nbuf);
                }
                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(&nbuf);
        return num_ignored;
}

int cmd_check_ignore(int argc, const char **argv, const char *prefix)
{
        int num_ignored;
        struct dir_struct dir;

        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 (read_cache() < 0)
                die(_("index file corrupt"));

        memset(&dir, 0, sizeof(dir));
        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");
        }

        clear_directory(&dir);

        return !num_ignored;
}