#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "attr.h"
#include "quote.h"
#include "parse-options.h"

static int all_attrs;
static int cached_attrs;
static int stdin_paths;
static const char * const check_attr_usage[] = {
N_("git check-attr [-a | --all | <attr>...] [--] <pathname>..."),
N_("git check-attr --stdin [-z] [-a | --all | <attr>...]"),
NULL
};

static int nul_term_line;

static const struct option check_attr_options[] = {
        OPT_BOOL('a', "all", &all_attrs, N_("report all attributes set on file")),
        OPT_BOOL(0,  "cached", &cached_attrs, N_("use .gitattributes only from the index")),
        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_END()
};

static void output_attr(struct attr_check *check, const char *file)
{
        int j;
        int cnt = check->nr;

        for (j = 0; j < cnt; j++) {
                const char *value = check->items[j].value;

                if (ATTR_TRUE(value))
                        value = "set";
                else if (ATTR_FALSE(value))
                        value = "unset";
                else if (ATTR_UNSET(value))
                        value = "unspecified";

                if (nul_term_line) {
                        printf("%s%c" /* path */
                               "%s%c" /* attrname */
                               "%s%c" /* attrvalue */,
                               file, 0,
                               git_attr_name(check->items[j].attr), 0, value, 0);
                } else {
                        quote_c_style(file, NULL, stdout, 0);
                        printf(": %s: %s\n",
                               git_attr_name(check->items[j].attr), value);
                }
        }
}

static void check_attr(const char *prefix,
                       struct attr_check *check,
                       int collect_all,
                       const char *file)
{
        char *full_path =
                prefix_path(prefix, prefix ? strlen(prefix) : 0, file);

        if (collect_all) {
                git_all_attrs(&the_index, full_path, check);
        } else {
                git_check_attr(&the_index, full_path, check);
        }
        output_attr(check, file);

        free(full_path);
}

static void check_attr_stdin_paths(const char *prefix,
                                   struct attr_check *check,
                                   int collect_all)
{
        struct strbuf buf = STRBUF_INIT;
        struct strbuf unquoted = STRBUF_INIT;
        strbuf_getline_fn getline_fn;

        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);
                }
                check_attr(prefix, check, collect_all, buf.buf);
                maybe_flush_or_die(stdout, "attribute to stdout");
        }
        strbuf_release(&buf);
        strbuf_release(&unquoted);
}

static NORETURN void error_with_usage(const char *msg)
{
        error("%s", msg);
        usage_with_options(check_attr_usage, check_attr_options);
}

int cmd_check_attr(int argc, const char **argv, const char *prefix)
{
        struct attr_check *check;
        int cnt, i, doubledash, filei;

        if (!is_bare_repository())
                setup_work_tree();

        git_config(git_default_config, NULL);

        argc = parse_options(argc, argv, prefix, check_attr_options,
                             check_attr_usage, PARSE_OPT_KEEP_DASHDASH);

        if (read_cache() < 0) {
                die("invalid cache");
        }

        if (cached_attrs)
                git_attr_set_direction(GIT_ATTR_INDEX);

        doubledash = -1;
        for (i = 0; doubledash < 0 && i < argc; i++) {
                if (!strcmp(argv[i], "--"))
                        doubledash = i;
        }

        /* Process --all and/or attribute arguments: */
        if (all_attrs) {
                if (doubledash >= 1)
                        error_with_usage("Attributes and --all both specified");

                cnt = 0;
                filei = doubledash + 1;
        } else if (doubledash == 0) {
                error_with_usage("No attribute specified");
        } else if (doubledash < 0) {
                if (!argc)
                        error_with_usage("No attribute specified");

                if (stdin_paths) {
                        /* Treat all arguments as attribute names. */
                        cnt = argc;
                        filei = argc;
                } else {
                        /* Treat exactly one argument as an attribute name. */
                        cnt = 1;
                        filei = 1;
                }
        } else {
                cnt = doubledash;
                filei = doubledash + 1;
        }

        /* Check file argument(s): */
        if (stdin_paths) {
                if (filei < argc)
                        error_with_usage("Can't specify files with --stdin");
        } else {
                if (filei >= argc)
                        error_with_usage("No file specified");
        }

        check = attr_check_alloc();
        if (!all_attrs) {
                for (i = 0; i < cnt; i++) {
                        const struct git_attr *a = git_attr(argv[i]);

                        if (!a)
                                return error("%s: not a valid attribute name",
                                             argv[i]);
                        attr_check_append(check, a);
                }
        }

        if (stdin_paths)
                check_attr_stdin_paths(prefix, check, all_attrs);
        else {
                for (i = filei; i < argc; i++)
                        check_attr(prefix, check, all_attrs, argv[i]);
                maybe_flush_or_die(stdout, "attribute to stdout");
        }

        attr_check_free(check);
        return 0;
}