#include "builtin.h"

#include "config.h"

#include "gettext.h"

#include "refs.h"

#include "parse-options.h"

#include "strbuf.h"

static const char * const git_symbolic_ref_usage[] = {

  N_("git symbolic-ref [-m <reason>] <name> <ref>"),

  N_("git symbolic-ref [-q] [--short] [--no-recurse] <name>"),

  N_("git symbolic-ref --delete [-q] <name>"),

  NULL

};

static int check_symref(const char *HEAD, int quiet, int shorten, int recurse, int print)

{

  int resolve_flags, flag;

  const char *refname;

  resolve_flags = (recurse ? 0 : RESOLVE_REF_NO_RECURSE);

  refname = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),

            HEAD, resolve_flags, NULL, &flag);

  if (!refname)

    die("No such ref: %s", HEAD);

  else if (!(flag & REF_ISSYMREF)) {

    if (!quiet)

      die("ref %s is not a symbolic ref", HEAD);

    else

      return 1;

  }

  if (print) {

    char *to_free = NULL;

    if (shorten)

      refname = to_free = refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),

                   refname,

                   0);

    puts(refname);

    free(to_free);

  }

  return 0;

}

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

{

  int quiet = 0, delete = 0, shorten = 0, recurse = 1, ret = 0;

  const char *msg = NULL;

  struct option options[] = {

    OPT__QUIET(&quiet,

      N_("suppress error message for non-symbolic (detached) refs")),

    OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),

    OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),

    OPT_BOOL(0, "recurse", &recurse, N_("recursively dereference (default)")),

    OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),

    OPT_END(),

  };

  git_config(git_default_config, NULL);

  argc = parse_options(argc, argv, prefix, options,

           git_symbolic_ref_usage, 0);

  if (msg && !*msg)

    die("Refusing to perform update with empty message");

  if (delete) {

    if (argc != 1)

      usage_with_options(git_symbolic_ref_usage, options);

    ret = check_symref(argv[0], 1, 0, 0, 0);

    if (ret)

      die("Cannot delete %s, not a symbolic ref", argv[0]);

    if (!strcmp(argv[0], "HEAD"))

      die("deleting '%s' is not allowed", argv[0]);

    return refs_delete_ref(get_main_ref_store(the_repository),

               NULL, argv[0], NULL, REF_NO_DEREF);

  }

  switch (argc) {

  case 1:

    ret = check_symref(argv[0], quiet, shorten, recurse, 1);

    break;

  case 2:

    if (!strcmp(argv[0], "HEAD") &&

        !starts_with(argv[1], "refs/"))

      die("Refusing to point HEAD outside of refs/");

    if (check_refname_format(argv[1], REFNAME_ALLOW_ONELEVEL) < 0)

      die("Refusing to set '%s' to invalid ref '%s'", argv[0], argv[1]);

    ret = !!refs_update_symref(get_main_ref_store(the_repository),

             argv[0], argv[1], msg);

    break;

  default:

    usage_with_options(git_symbolic_ref_usage, options);

  }

  return ret;

}