#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 null_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_BOOLEAN(0, "stdin", &stdin_paths,
                    N_("read file names from stdin")),
        OPT_BOOLEAN('z', NULL, &null_term_line,
                    N_("input paths are terminated by a null character")),
        OPT_BOOLEAN('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 (!null_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 path_exclude_check *check,
                        const char *prefix, const char **pathspec)
{
        const char *path, *full_path;
        char *seen;
        int num_ignored = 0, dtype = DT_UNKNOWN, i;
        struct exclude *exclude;

        if (!pathspec || !*pathspec) {
                if (!quiet)
                        fprintf(stderr, "no pathspec given.\n");
                return 0;
        }

        /*
         * 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; pathspec[i]; i++) {
                path = pathspec[i];
                full_path = prefix_path(prefix, prefix
                                        ? strlen(prefix) : 0, path);
                full_path = check_path_for_gitlink(full_path);
                die_if_path_beyond_symlink(full_path, prefix);
                exclude = NULL;
                if (!seen[i]) {
                        exclude = last_exclude_matching_path(check, full_path,
                                                             -1, &dtype);
                }
                if (!quiet && (exclude || show_non_matching))
                        output_exclude(path, exclude);
                if (exclude)
                        num_ignored++;
        }
        free(seen);

        return num_ignored;
}

static int check_ignore_stdin_paths(struct path_exclude_check *check, const char *prefix)
{
        struct strbuf buf, nbuf;
        char **pathspec = NULL;
        size_t nr = 0, alloc = 0;
        int line_termination = null_term_line ? 0 : '\n';
        int num_ignored;

        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);
                }
                ALLOC_GROW(pathspec, nr + 1, alloc);
                pathspec[nr] = xcalloc(strlen(buf.buf) + 1, sizeof(*buf.buf));
                strcpy(pathspec[nr++], buf.buf);
        }
        ALLOC_GROW(pathspec, nr + 1, alloc);
        pathspec[nr] = NULL;
        num_ignored = check_ignore(check, prefix, (const char **)pathspec);
        maybe_flush_or_die(stdout, "attribute 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;
        struct path_exclude_check check;

        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 (null_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));
        dir.flags |= DIR_COLLECT_IGNORED;
        setup_standard_excludes(&dir);

        path_exclude_check_init(&check, &dir);
        if (stdin_paths) {
                num_ignored = check_ignore_stdin_paths(&check, prefix);
        } else {
                num_ignored = check_ignore(&check, prefix, argv);
                maybe_flush_or_die(stdout, "ignore to stdout");
        }

        clear_directory(&dir);
        path_exclude_check_clear(&check);

        return !num_ignored;
}