#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "config.h"

#include "builtin.h"

#include "exec-cmd.h"

#include "run-command.h"

#include "levenshtein.h"

#include "gettext.h"

#include "help.h"

#include "command-list.h"

#include "string-list.h"

#include "column.h"

#include "version.h"

#include "refs.h"

#include "parse-options.h"

#include "prompt.h"

#include "fsmonitor-ipc.h"

#ifndef NO_CURL

#include "git-curl-compat.h" /* For LIBCURL_VERSION only */

#endif

struct category_description {

  uint32_t category;

  const char *desc;

};

static uint32_t common_mask =

  CAT_init | CAT_worktree | CAT_info |

  CAT_history | CAT_remote;

static struct category_description common_categories[] = {

  { CAT_init, N_("start a working area (see also: git help tutorial)") },

  { CAT_worktree, N_("work on the current change (see also: git help everyday)") },

  { CAT_info, N_("examine the history and state (see also: git help revisions)") },

  { CAT_history, N_("grow, mark and tweak your common history") },

  { CAT_remote, N_("collaborate (see also: git help workflows)") },

  { 0, NULL }

};

static struct category_description main_categories[] = {

  { CAT_mainporcelain, N_("Main Porcelain Commands") },

  { CAT_ancillarymanipulators, N_("Ancillary Commands / Manipulators") },

  { CAT_ancillaryinterrogators, N_("Ancillary Commands / Interrogators") },

  { CAT_foreignscminterface, N_("Interacting with Others") },

  { CAT_plumbingmanipulators, N_("Low-level Commands / Manipulators") },

  { CAT_plumbinginterrogators, N_("Low-level Commands / Interrogators") },

  { CAT_synchingrepositories, N_("Low-level Commands / Syncing Repositories") },

  { CAT_purehelpers, N_("Low-level Commands / Internal Helpers") },

  { CAT_userinterfaces, N_("User-facing repository, command and file interfaces") },

  { CAT_developerinterfaces, N_("Developer-facing file formats, protocols and other interfaces") },

  { 0, NULL }

};

static const char *drop_prefix(const char *name, uint32_t category)

{

  const char *new_name;

  const char *prefix;

  switch (category) {

  case CAT_guide:

  case CAT_userinterfaces:

  case CAT_developerinterfaces:

    prefix = "git";

    break;

  default:

    prefix = "git-";

    break;

  }

  if (skip_prefix(name, prefix, &new_name))

    return new_name;

  return name;

}

static void extract_cmds(struct cmdname_help **p_cmds, uint32_t mask)

{

  int i, nr = 0;

  struct cmdname_help *cmds;

  if (ARRAY_SIZE(command_list) == 0)

    BUG("empty command_list[] is a sign of broken generate-cmdlist.sh");

  ALLOC_ARRAY(cmds, ARRAY_SIZE(command_list) + 1);

  for (i = 0; i < ARRAY_SIZE(command_list); i++) {

    const struct cmdname_help *cmd = command_list + i;

    if (!(cmd->category & mask))

      continue;

    cmds[nr] = *cmd;

    cmds[nr].name = drop_prefix(cmd->name, cmd->category);

    nr++;

  }

  cmds[nr].name = NULL;

  *p_cmds = cmds;

}

static void print_command_list(const struct cmdname_help *cmds,

             uint32_t mask, int longest)

{

  int i;

  for (i = 0; cmds[i].name; i++) {

    if (cmds[i].category & mask) {

      size_t len = strlen(cmds[i].name);

      printf("   %s   ", cmds[i].name);

      if (longest > len)

        mput_char(' ', longest - len);

      puts(_(cmds[i].help));

    }

  }

}

static int cmd_name_cmp(const void *elem1, const void *elem2)

{

  const struct cmdname_help *e1 = elem1;

  const struct cmdname_help *e2 = elem2;

  return strcmp(e1->name, e2->name);

}

static void print_cmd_by_category(const struct category_description *catdesc,

          int *longest_p)

{

  struct cmdname_help *cmds;

  int longest = 0;

  int i, nr = 0;

  uint32_t mask = 0;

  for (i = 0; catdesc[i].desc; i++)

    mask |= catdesc[i].category;

  extract_cmds(&cmds, mask);

  for (i = 0; cmds[i].name; i++, nr++) {

    if (longest < strlen(cmds[i].name))

      longest = strlen(cmds[i].name);

  }

  QSORT(cmds, nr, cmd_name_cmp);

  for (i = 0; catdesc[i].desc; i++) {

    uint32_t mask = catdesc[i].category;

    const char *desc = catdesc[i].desc;

    if (i)

      putchar('\n');

    puts(_(desc));

    print_command_list(cmds, mask, longest);

  }

  free(cmds);

  if (longest_p)

    *longest_p = longest;

}

void add_cmdname(struct cmdnames *cmds, const char *name, int len)

{

  struct cmdname *ent;

  FLEX_ALLOC_MEM(ent, name, name, len);

  ent->len = len;

  ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);

  cmds->names[cmds->cnt++] = ent;

}

void cmdnames_release(struct cmdnames *cmds)

{

  int i;

  for (i = 0; i < cmds->cnt; ++i)

    free(cmds->names[i]);

  free(cmds->names);

  cmds->cnt = 0;

  cmds->alloc = 0;

}

static int cmdname_compare(const void *a_, const void *b_)

{

  struct cmdname *a = *(struct cmdname **)a_;

  struct cmdname *b = *(struct cmdname **)b_;

  return strcmp(a->name, b->name);

}

static void uniq(struct cmdnames *cmds)

{

  int i, j;

  if (!cmds->cnt)

    return;

  for (i = j = 1; i < cmds->cnt; i++) {

    if (!strcmp(cmds->names[i]->name, cmds->names[j-1]->name))

      free(cmds->names[i]);

    else

      cmds->names[j++] = cmds->names[i];

  }

  cmds->cnt = j;

}

void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)

{

  int ci, cj, ei;

  int cmp;

  ci = cj = ei = 0;

  while (ci < cmds->cnt && ei < excludes->cnt) {

    cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);

    if (cmp < 0)

      cmds->names[cj++] = cmds->names[ci++];

    else if (cmp == 0) {

      ei++;

      free(cmds->names[ci++]);

    } else if (cmp > 0)

      ei++;

  }

  while (ci < cmds->cnt)

    cmds->names[cj++] = cmds->names[ci++];

  cmds->cnt = cj;

}

static void pretty_print_cmdnames(struct cmdnames *cmds, unsigned int colopts)

{

  struct string_list list = STRING_LIST_INIT_NODUP;

  struct column_options copts;

  int i;

  for (i = 0; i < cmds->cnt; i++)

    string_list_append(&list, cmds->names[i]->name);

  /*

   * always enable column display, we only consult column.*

   * about layout strategy and stuff

   */

  colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;

  memset(&copts, 0, sizeof(copts));

  copts.indent = "  ";

  copts.padding = 2;

  print_columns(&list, colopts, &copts);

  string_list_clear(&list, 0);

}

static void list_commands_in_dir(struct cmdnames *cmds,

           const char *path,

           const char *prefix)

{

  DIR *dir = opendir(path);

  struct dirent *de;

  struct strbuf buf = STRBUF_INIT;

  int len;

  if (!dir)

    return;

  if (!prefix)

    prefix = "git-";

  strbuf_addf(&buf, "%s/", path);

  len = buf.len;

  while ((de = readdir(dir)) != NULL) {

    const char *ent;

    size_t entlen;

    if (!skip_prefix(de->d_name, prefix, &ent))

      continue;

    strbuf_setlen(&buf, len);

    strbuf_addstr(&buf, de->d_name);

    if (!is_executable(buf.buf))

      continue;

    entlen = strlen(ent);

    strip_suffix(ent, ".exe", &entlen);

    add_cmdname(cmds, ent, entlen);

  }

  closedir(dir);

  strbuf_release(&buf);

}

void load_command_list(const char *prefix,

    struct cmdnames *main_cmds,

    struct cmdnames *other_cmds)

{

  const char *env_path = getenv("PATH");

  const char *exec_path = git_exec_path();

  load_builtin_commands(prefix, main_cmds);

  if (exec_path) {

    list_commands_in_dir(main_cmds, exec_path, prefix);

    QSORT(main_cmds->names, main_cmds->cnt, cmdname_compare);

    uniq(main_cmds);

  }

  if (env_path) {

    char *paths, *path, *colon;

    path = paths = xstrdup(env_path);

    while (1) {

      if ((colon = strchr(path, PATH_SEP)))

        *colon = 0;

      if (!exec_path || strcmp(path, exec_path))

        list_commands_in_dir(other_cmds, path, prefix);

      if (!colon)

        break;

      path = colon + 1;

    }

    free(paths);

    QSORT(other_cmds->names, other_cmds->cnt, cmdname_compare);

    uniq(other_cmds);

  }

  exclude_cmds(other_cmds, main_cmds);

}

static int get_colopts(const char *var, const char *value,

           const struct config_context *ctx UNUSED, void *data)

{

  unsigned int *colopts = data;

  if (starts_with(var, "column."))

    return git_column_config(var, value, "help", colopts);

  return 0;

}

void list_commands(struct cmdnames *main_cmds, struct cmdnames *other_cmds)

{

  unsigned int colopts = 0;

  git_config(get_colopts, &colopts);

  if (main_cmds->cnt) {

    const char *exec_path = git_exec_path();

    printf_ln(_("available git commands in '%s'"), exec_path);

    putchar('\n');

    pretty_print_cmdnames(main_cmds, colopts);

    putchar('\n');

  }

  if (other_cmds->cnt) {

    puts(_("git commands available from elsewhere on your $PATH"));

    putchar('\n');

    pretty_print_cmdnames(other_cmds, colopts);

    putchar('\n');

  }

}

void list_common_cmds_help(void)

{

  puts(_("These are common Git commands used in various situations:"));

  putchar('\n');

  print_cmd_by_category(common_categories, NULL);

}

void list_all_main_cmds(struct string_list *list)

{

  struct cmdnames main_cmds, other_cmds;

  int i;

  memset(&main_cmds, 0, sizeof(main_cmds));

  memset(&other_cmds, 0, sizeof(other_cmds));

  load_command_list("git-", &main_cmds, &other_cmds);

  for (i = 0; i < main_cmds.cnt; i++)

    string_list_append(list, main_cmds.names[i]->name);

  cmdnames_release(&main_cmds);

  cmdnames_release(&other_cmds);

}

void list_all_other_cmds(struct string_list *list)

{

  struct cmdnames main_cmds, other_cmds;

  int i;

  memset(&main_cmds, 0, sizeof(main_cmds));

  memset(&other_cmds, 0, sizeof(other_cmds));

  load_command_list("git-", &main_cmds, &other_cmds);

  for (i = 0; i < other_cmds.cnt; i++)

    string_list_append(list, other_cmds.names[i]->name);

  cmdnames_release(&main_cmds);

  cmdnames_release(&other_cmds);

}

void list_cmds_by_category(struct string_list *list,

         const char *cat)

{

  int i, n = ARRAY_SIZE(command_list);

  uint32_t cat_id = 0;

  for (i = 0; category_names[i]; i++) {

    if (!strcmp(cat, category_names[i])) {

      cat_id = 1UL << i;

      break;

    }

  }

  if (!cat_id)

    die(_("unsupported command listing type '%s'"), cat);

  for (i = 0; i < n; i++) {

    struct cmdname_help *cmd = command_list + i;

    if (!(cmd->category & cat_id))

      continue;

    string_list_append(list, drop_prefix(cmd->name, cmd->category));

  }

}

void list_cmds_by_config(struct string_list *list)

{

  const char *cmd_list;

  if (git_config_get_string_tmp("completion.commands", &cmd_list))

    return;

  string_list_sort(list);

  string_list_remove_duplicates(list, 0);

  while (*cmd_list) {

    struct strbuf sb = STRBUF_INIT;

    const char *p = strchrnul(cmd_list, ' ');

    strbuf_add(&sb, cmd_list, p - cmd_list);

    if (sb.buf[0] == '-')

      string_list_remove(list, sb.buf + 1, 0);

    else

      string_list_insert(list, sb.buf);

    strbuf_release(&sb);

    while (*p == ' ')

      p++;

    cmd_list = p;

  }

}

void list_guides_help(void)

{

  struct category_description catdesc[] = {

    { CAT_guide, N_("The Git concept guides are:") },

    { 0, NULL }

  };

  print_cmd_by_category(catdesc, NULL);

  putchar('\n');

}

void list_user_interfaces_help(void)

{

  struct category_description catdesc[] = {

    { CAT_userinterfaces, N_("User-facing repository, command and file interfaces:") },

    { 0, NULL }

  };

  print_cmd_by_category(catdesc, NULL);

  putchar('\n');

}

void list_developer_interfaces_help(void)

{

  struct category_description catdesc[] = {

    { CAT_developerinterfaces, N_("File formats, protocols and other developer interfaces:") },

    { 0, NULL }

  };

  print_cmd_by_category(catdesc, NULL);

  putchar('\n');

}

static int get_alias(const char *var, const char *value,

         const struct config_context *ctx UNUSED, void *data)

{

  struct string_list *list = data;

  if (skip_prefix(var, "alias.", &var)) {

    if (!value)

      return config_error_nonbool(var);

    string_list_append(list, var)->util = xstrdup(value);

  }

  return 0;

}

static void list_all_cmds_help_external_commands(void)

{

  struct string_list others = STRING_LIST_INIT_DUP;

  int i;

  list_all_other_cmds(&others);

  if (others.nr)

    printf("\n%s\n", _("External commands"));

  for (i = 0; i < others.nr; i++)

    printf("   %s\n", others.items[i].string);

  string_list_clear(&others, 0);

}

static void list_all_cmds_help_aliases(int longest)

{

  struct string_list alias_list = STRING_LIST_INIT_DUP;

  struct cmdname_help *aliases;

  int i;

  git_config(get_alias, &alias_list);

  string_list_sort(&alias_list);

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

    size_t len = strlen(alias_list.items[i].string);

    if (longest < len)

      longest = len;

  }

  if (alias_list.nr) {

    printf("\n%s\n", _("Command aliases"));

    ALLOC_ARRAY(aliases, alias_list.nr + 1);

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

      aliases[i].name = alias_list.items[i].string;

      aliases[i].help = alias_list.items[i].util;

      aliases[i].category = 1;

    }

    aliases[alias_list.nr].name = NULL;

    print_command_list(aliases, 1, longest);

    free(aliases);

  }

  string_list_clear(&alias_list, 1);

}

void list_all_cmds_help(int show_external_commands, int show_aliases)

{

  int longest;

  puts(_("See 'git help <command>' to read about a specific subcommand"));

  putchar('\n');

  print_cmd_by_category(main_categories, &longest);

  if (show_external_commands)

    list_all_cmds_help_external_commands();

  if (show_aliases)

    list_all_cmds_help_aliases(longest);

}

int is_in_cmdlist(struct cmdnames *c, const char *s)

{

  int i;

  for (i = 0; i < c->cnt; i++)

    if (!strcmp(s, c->names[i]->name))

      return 1;

  return 0;

}

static int autocorrect;

static struct cmdnames aliases;

#define AUTOCORRECT_PROMPT (-3)

#define AUTOCORRECT_NEVER (-2)

#define AUTOCORRECT_IMMEDIATELY (-1)

static int git_unknown_cmd_config(const char *var, const char *value,

          const struct config_context *ctx,

          void *cb UNUSED)

{

  const char *p;

  if (!strcmp(var, "help.autocorrect")) {

    if (!value)

      return config_error_nonbool(var);

    if (!strcmp(value, "never")) {

      autocorrect = AUTOCORRECT_NEVER;

    } else if (!strcmp(value, "immediate")) {

      autocorrect = AUTOCORRECT_IMMEDIATELY;

    } else if (!strcmp(value, "prompt")) {

      autocorrect = AUTOCORRECT_PROMPT;

    } else {

      int v = git_config_int(var, value, ctx->kvi);

      autocorrect = (v < 0)

        ? AUTOCORRECT_IMMEDIATELY : v;

    }

  }

  /* Also use aliases for command lookup */

  if (skip_prefix(var, "alias.", &p))

    add_cmdname(&aliases, p, strlen(p));

  return 0;

}

static int levenshtein_compare(const void *p1, const void *p2)

{

  const struct cmdname *const *c1 = p1, *const *c2 = p2;

  const char *s1 = (*c1)->name, *s2 = (*c2)->name;

  int l1 = (*c1)->len;

  int l2 = (*c2)->len;

  return l1 != l2 ? l1 - l2 : strcmp(s1, s2);

}

static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)

{

  int i;

  ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);

  for (i = 0; i < old->cnt; i++)

    cmds->names[cmds->cnt++] = old->names[i];

  FREE_AND_NULL(old->names);

  old->cnt = 0;

}

/* An empirically derived magic number */

#define SIMILARITY_FLOOR 7

#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)

static const char bad_interpreter_advice[] =

  N_("'%s' appears to be a git command, but we were not\n"

  "able to execute it. Maybe git-%s is broken?");

const char *help_unknown_cmd(const char *cmd)

{

  int i, n, best_similarity = 0;

  struct cmdnames main_cmds, other_cmds;

  struct cmdname_help *common_cmds;

  memset(&main_cmds, 0, sizeof(main_cmds));

  memset(&other_cmds, 0, sizeof(other_cmds));

  memset(&aliases, 0, sizeof(aliases));

  read_early_config(git_unknown_cmd_config, NULL);

  /*

   * Disable autocorrection prompt in a non-interactive session

   */

  if ((autocorrect == AUTOCORRECT_PROMPT) && (!isatty(0) || !isatty(2)))

    autocorrect = AUTOCORRECT_NEVER;

  if (autocorrect == AUTOCORRECT_NEVER) {

    fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);

    exit(1);

  }

  load_command_list("git-", &main_cmds, &other_cmds);

  add_cmd_list(&main_cmds, &aliases);

  add_cmd_list(&main_cmds, &other_cmds);

  QSORT(main_cmds.names, main_cmds.cnt, cmdname_compare);

  uniq(&main_cmds);

  extract_cmds(&common_cmds, common_mask);

  /* This abuses cmdname->len for levenshtein distance */

  for (i = 0, n = 0; i < main_cmds.cnt; i++) {

    int cmp = 0; /* avoid compiler stupidity */

    const char *candidate = main_cmds.names[i]->name;

    /*

     * An exact match means we have the command, but

     * for some reason exec'ing it gave us ENOENT; probably

     * it's a bad interpreter in the #! line.

     */

    if (!strcmp(candidate, cmd))

      die(_(bad_interpreter_advice), cmd, cmd);

    /* Does the candidate appear in common_cmds list? */

    while (common_cmds[n].name &&

           (cmp = strcmp(common_cmds[n].name, candidate)) < 0)

      n++;

    if (common_cmds[n].name && !cmp) {

      /* Yes, this is one of the common commands */

      n++; /* use the entry from common_cmds[] */

      if (starts_with(candidate, cmd)) {

        /* Give prefix match a very good score */

        main_cmds.names[i]->len = 0;

        continue;

      }

    }

    main_cmds.names[i]->len =

      levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;

  }

  FREE_AND_NULL(common_cmds);

  QSORT(main_cmds.names, main_cmds.cnt, levenshtein_compare);

  if (!main_cmds.cnt)

    die(_("Uh oh. Your system reports no Git commands at all."));

  /* skip and count prefix matches */

  for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)

    ; /* still counting */

  if (main_cmds.cnt <= n) {

    /* prefix matches with everything? that is too ambiguous */

    best_similarity = SIMILARITY_FLOOR + 1;

  } else {

    /* count all the most similar ones */

    for (best_similarity = main_cmds.names[n++]->len;

         (n < main_cmds.cnt &&

          best_similarity == main_cmds.names[n]->len);

         n++)

      ; /* still counting */

  }

  if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {

    const char *assumed = main_cmds.names[0]->name;

    main_cmds.names[0] = NULL;

    cmdnames_release(&main_cmds);

    fprintf_ln(stderr,

         _("WARNING: You called a Git command named '%s', "

           "which does not exist."),

         cmd);

    if (autocorrect == AUTOCORRECT_IMMEDIATELY)

      fprintf_ln(stderr,

           _("Continuing under the assumption that "

             "you meant '%s'."),

           assumed);

    else if (autocorrect == AUTOCORRECT_PROMPT) {

      char *answer;

      struct strbuf msg = STRBUF_INIT;

      strbuf_addf(&msg, _("Run '%s' instead [y/N]? "), assumed);

      answer = git_prompt(msg.buf, PROMPT_ECHO);

      strbuf_release(&msg);

      if (!(starts_with(answer, "y") ||

            starts_with(answer, "Y")))

        exit(1);

    } else {

      fprintf_ln(stderr,

           _("Continuing in %0.1f seconds, "

             "assuming that you meant '%s'."),

           (float)autocorrect/10.0, assumed);

      sleep_millisec(autocorrect * 100);

    }

    return assumed;

  }

  fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);

  if (SIMILAR_ENOUGH(best_similarity)) {

    fprintf_ln(stderr,

         Q_("\nThe most similar command is",

            "\nThe most similar commands are",

         n));

    for (i = 0; i < n; i++)

      fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);

  }

  exit(1);

}

void get_version_info(struct strbuf *buf, int show_build_options)

{

  /*

   * The format of this string should be kept stable for compatibility

   * with external projects that rely on the output of "git version".

   *

   * Always show the version, even if other options are given.

   */

  strbuf_addf(buf, "git version %s\n", git_version_string);

  if (show_build_options) {

    strbuf_addf(buf, "cpu: %s\n", GIT_HOST_CPU);

    if (git_built_from_commit_string[0])

      strbuf_addf(buf, "built from commit: %s\n",

             git_built_from_commit_string);

    else

      strbuf_addstr(buf, "no commit associated with this build\n");

    strbuf_addf(buf, "sizeof-long: %d\n", (int)sizeof(long));

    strbuf_addf(buf, "sizeof-size_t: %d\n", (int)sizeof(size_t));

    strbuf_addf(buf, "shell-path: %s\n", SHELL_PATH);

    /* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */

    if (fsmonitor_ipc__is_supported())

      strbuf_addstr(buf, "feature: fsmonitor--daemon\n");

#if defined LIBCURL_VERSION

    strbuf_addf(buf, "libcurl: %s\n", LIBCURL_VERSION);

#endif

#if defined OPENSSL_VERSION_TEXT

    strbuf_addf(buf, "OpenSSL: %s\n", OPENSSL_VERSION_TEXT);

#endif

#if defined ZLIB_VERSION

    strbuf_addf(buf, "zlib: %s\n", ZLIB_VERSION);

#endif

  }

}

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

{

  struct strbuf buf = STRBUF_INIT;

  int build_options = 0;

  const char * const usage[] = {

    N_("git version [--build-options]"),

    NULL

  };

  struct option options[] = {

    OPT_BOOL(0, "build-options", &build_options,

       "also print build options"),

    OPT_END()

  };

  argc = parse_options(argc, argv, prefix, options, usage, 0);

  get_version_info(&buf, build_options);

  printf("%s", buf.buf);

  strbuf_release(&buf);

  return 0;

}

struct similar_ref_cb {

  const char *base_ref;

  struct string_list *similar_refs;

};

static int append_similar_ref(const char *refname, const char *referent UNUSED,

            const struct object_id *oid UNUSED,

            int flags UNUSED, void *cb_data)

{

  struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);

  char *branch = strrchr(refname, '/') + 1;

  /* A remote branch of the same name is deemed similar */

  if (starts_with(refname, "refs/remotes/") &&

      !strcmp(branch, cb->base_ref))

    string_list_append_nodup(cb->similar_refs,

           refs_shorten_unambiguous_ref(get_main_ref_store(the_repository), refname, 1));

  return 0;

}

static struct string_list guess_refs(const char *ref)

{

  struct similar_ref_cb ref_cb;

  struct string_list similar_refs = STRING_LIST_INIT_DUP;

  ref_cb.base_ref = ref;

  ref_cb.similar_refs = &similar_refs;

  refs_for_each_ref(get_main_ref_store(the_repository),

        append_similar_ref, &ref_cb);

  return similar_refs;

}

NORETURN void help_unknown_ref(const char *ref, const char *cmd,

             const char *error)

{

  int i;

  struct string_list suggested_refs = guess_refs(ref);

  fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);

  if (suggested_refs.nr > 0) {

    fprintf_ln(stderr,

         Q_("\nDid you mean this?",

            "\nDid you mean one of these?",

            suggested_refs.nr));

    for (i = 0; i < suggested_refs.nr; i++)

      fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);

  }

  string_list_clear(&suggested_refs, 0);

  exit(1);

}