builtin/help.c

   1 /*
   2  * Builtin help command
   3  */
   4 #include "cache.h"
   5 #include "config.h"
   6 #include "builtin.h"
   7 #include "exec-cmd.h"
   8 #include "parse-options.h"
   9 #include "run-command.h"
  10 #include "config-list.h"
  11 #include "help.h"
  12 #include "alias.h"
  13
  14 #ifndef DEFAULT_HELP_FORMAT
  15 #define DEFAULT_HELP_FORMAT "man"
  16 #endif
  17
  18 static struct man_viewer_list {
  19         struct man_viewer_list *next;
  20         char name[FLEX_ARRAY];
  21 } *man_viewer_list;
  22
  23 static struct man_viewer_info_list {
  24         struct man_viewer_info_list *next;
  25         const char *info;
  26         char name[FLEX_ARRAY];
  27 } *man_viewer_info_list;
  28
  29 enum help_format {
  30         HELP_FORMAT_NONE,
  31         HELP_FORMAT_MAN,
  32         HELP_FORMAT_INFO,
  33         HELP_FORMAT_WEB
  34 };
  35
  36 enum show_config_type {
  37         SHOW_CONFIG_HUMAN,
  38         SHOW_CONFIG_VARS,
  39         SHOW_CONFIG_SECTIONS,
  40 };
  41
  42 static enum help_action {
  43         HELP_ACTION_ALL = 1,
  44         HELP_ACTION_GUIDES,
  45         HELP_ACTION_CONFIG,
  46         HELP_ACTION_USER_INTERFACES,
  47         HELP_ACTION_DEVELOPER_INTERFACES,
  48         HELP_ACTION_CONFIG_FOR_COMPLETION,
  49         HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION,
  50 } cmd_mode;
  51
  52 static const char *html_path;
  53 static int verbose = 1;
  54 static enum help_format help_format = HELP_FORMAT_NONE;
  55 static int exclude_guides;
  56 static int show_external_commands = -1;
  57 static int show_aliases = -1;
  58 static struct option builtin_help_options[] = {
  59         OPT_CMDMODE('a', "all", &cmd_mode, N_("print all available commands"),
  60                     HELP_ACTION_ALL),
  61         OPT_BOOL(0, "external-commands", &show_external_commands,
  62                  N_("show external commands in --all")),
  63         OPT_BOOL(0, "aliases", &show_aliases, N_("show aliases in --all")),
  64         OPT_HIDDEN_BOOL(0, "exclude-guides", &exclude_guides, N_("exclude guides")),
  65         OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN),
  66         OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"),
  67                         HELP_FORMAT_WEB),
  68         OPT_SET_INT('i', "info", &help_format, N_("show info page"),
  69                         HELP_FORMAT_INFO),
  70         OPT__VERBOSE(&verbose, N_("print command description")),
  71
  72         OPT_CMDMODE('g', "guides", &cmd_mode, N_("print list of useful guides"),
  73                     HELP_ACTION_GUIDES),
  74         OPT_CMDMODE(0, "user-interfaces", &cmd_mode,
  75                     N_("print list of user-facing repository, command and file interfaces"),
  76                     HELP_ACTION_USER_INTERFACES),
  77         OPT_CMDMODE(0, "developer-interfaces", &cmd_mode,
  78                     N_("print list of file formats, protocols and other developer interfaces"),
  79                     HELP_ACTION_DEVELOPER_INTERFACES),
  80         OPT_CMDMODE('c', "config", &cmd_mode, N_("print all configuration variable names"),
  81                     HELP_ACTION_CONFIG),
  82         OPT_CMDMODE_F(0, "config-for-completion", &cmd_mode, "",
  83                     HELP_ACTION_CONFIG_FOR_COMPLETION, PARSE_OPT_HIDDEN),
  84         OPT_CMDMODE_F(0, "config-sections-for-completion", &cmd_mode, "",
  85                     HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION, PARSE_OPT_HIDDEN),
  86
  87         OPT_END(),
  88 };
  89
  90 static const char * const builtin_help_usage[] = {
  91         "git help [-a|--all] [--[no-]verbose]] [--[no-]external-commands] [--[no-]aliases]",
  92         N_("git help [[-i|--info] [-m|--man] [-w|--web]] [<command>|<doc>]"),
  93         "git help [-g|--guides]",
  94         "git help [-c|--config]",
  95         "git help [--user-interfaces]",
  96         "git help [--developer-interfaces]",
  97         NULL
  98 };
  99
 100 struct slot_expansion {
 101         const char *prefix;
 102         const char *placeholder;
 103         void (*fn)(struct string_list *list, const char *prefix);
 104         int found;
 105 };
 106
 107 static void list_config_help(enum show_config_type type)
 108 {
 109         struct slot_expansion slot_expansions[] = {
 110                 { "advice", "*", list_config_advices },
 111                 { "color.branch", "<slot>", list_config_color_branch_slots },
 112                 { "color.decorate", "<slot>", list_config_color_decorate_slots },
 113                 { "color.diff", "<slot>", list_config_color_diff_slots },
 114                 { "color.grep", "<slot>", list_config_color_grep_slots },
 115                 { "color.interactive", "<slot>", list_config_color_interactive_slots },
 116                 { "color.remote", "<slot>", list_config_color_sideband_slots },
 117                 { "color.status", "<slot>", list_config_color_status_slots },
 118                 { "fsck", "<msg-id>", list_config_fsck_msg_ids },
 119                 { "receive.fsck", "<msg-id>", list_config_fsck_msg_ids },
 120                 { NULL, NULL, NULL }
 121         };
 122         const char **p;
 123         struct slot_expansion *e;
 124         struct string_list keys = STRING_LIST_INIT_DUP;
 125         struct string_list keys_uniq = STRING_LIST_INIT_DUP;
 126         struct string_list_item *item;
 127         int i;
 128
 129         for (p = config_name_list; *p; p++) {
 130                 const char *var = *p;
 131                 struct strbuf sb = STRBUF_INIT;
 132
 133                 for (e = slot_expansions; e->prefix; e++) {
 134
 135                         strbuf_reset(&sb);
 136                         strbuf_addf(&sb, "%s.%s", e->prefix, e->placeholder);
 137                         if (!strcasecmp(var, sb.buf)) {
 138                                 e->fn(&keys, e->prefix);
 139                                 e->found++;
 140                                 break;
 141                         }
 142                 }
 143                 strbuf_release(&sb);
 144                 if (!e->prefix)
 145                         string_list_append(&keys, var);
 146         }
 147
 148         for (e = slot_expansions; e->prefix; e++)
 149                 if (!e->found)
 150                         BUG("slot_expansion %s.%s is not used",
 151                             e->prefix, e->placeholder);
 152
 153         string_list_sort(&keys);
 154         for (i = 0; i < keys.nr; i++) {
 155                 const char *var = keys.items[i].string;
 156                 const char *wildcard, *tag, *cut;
 157                 const char *dot = NULL;
 158                 struct strbuf sb = STRBUF_INIT;
 159
 160                 switch (type) {
 161                 case SHOW_CONFIG_HUMAN:
 162                         puts(var);
 163                         continue;
 164                 case SHOW_CONFIG_SECTIONS:
 165                         dot = strchr(var, '.');
 166                         break;
 167                 case SHOW_CONFIG_VARS:
 168                         break;
 169                 }
 170                 wildcard = strchr(var, '*');
 171                 tag = strchr(var, '<');
 172
 173                 if (!dot && !wildcard && !tag) {
 174                         string_list_append(&keys_uniq, var);
 175                         continue;
 176                 }
 177
 178                 if (dot)
 179                         cut = dot;
 180                 else if (wildcard && !tag)
 181                         cut = wildcard;
 182                 else if (!wildcard && tag)
 183                         cut = tag;
 184                 else
 185                         cut = wildcard < tag ? wildcard : tag;
 186
 187                 strbuf_add(&sb, var, cut - var);
 188                 string_list_append(&keys_uniq, sb.buf);
 189                 strbuf_release(&sb);
 190
 191         }
 192         string_list_clear(&keys, 0);
 193         string_list_remove_duplicates(&keys_uniq, 0);
 194         for_each_string_list_item(item, &keys_uniq)
 195                 puts(item->string);
 196         string_list_clear(&keys_uniq, 0);
 197 }
 198
 199 static enum help_format parse_help_format(const char *format)
 200 {
 201         if (!strcmp(format, "man"))
 202                 return HELP_FORMAT_MAN;
 203         if (!strcmp(format, "info"))
 204                 return HELP_FORMAT_INFO;
 205         if (!strcmp(format, "web") || !strcmp(format, "html"))
 206                 return HELP_FORMAT_WEB;
 207         /*
 208          * Please update _git_config() in git-completion.bash when you
 209          * add new help formats.
 210          */
 211         die(_("unrecognized help format '%s'"), format);
 212 }
 213
 214 static const char *get_man_viewer_info(const char *name)
 215 {
 216         struct man_viewer_info_list *viewer;
 217
 218         for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
 219         {
 220                 if (!strcasecmp(name, viewer->name))
 221                         return viewer->info;
 222         }
 223         return NULL;
 224 }
 225
 226 static int check_emacsclient_version(void)
 227 {
 228         struct strbuf buffer = STRBUF_INIT;
 229         struct child_process ec_process = CHILD_PROCESS_INIT;
 230         int version;
 231
 232         /* emacsclient prints its version number on stderr */
 233         strvec_pushl(&ec_process.args, "emacsclient", "--version", NULL);
 234         ec_process.err = -1;
 235         ec_process.stdout_to_stderr = 1;
 236         if (start_command(&ec_process))
 237                 return error(_("Failed to start emacsclient."));
 238
 239         strbuf_read(&buffer, ec_process.err, 20);
 240         close(ec_process.err);
 241
 242         /*
 243          * Don't bother checking return value, because "emacsclient --version"
 244          * seems to always exits with code 1.
 245          */
 246         finish_command(&ec_process);
 247
 248         if (!starts_with(buffer.buf, "emacsclient")) {
 249                 strbuf_release(&buffer);
 250                 return error(_("Failed to parse emacsclient version."));
 251         }
 252
 253         strbuf_remove(&buffer, 0, strlen("emacsclient"));
 254         version = atoi(buffer.buf);
 255
 256         if (version < 22) {
 257                 strbuf_release(&buffer);
 258                 return error(_("emacsclient version '%d' too old (< 22)."),
 259                         version);
 260         }
 261
 262         strbuf_release(&buffer);
 263         return 0;
 264 }
 265
 266 static void exec_woman_emacs(const char *path, const char *page)
 267 {
 268         if (!check_emacsclient_version()) {
 269                 /* This works only with emacsclient version >= 22. */
 270                 struct strbuf man_page = STRBUF_INIT;
 271
 272                 if (!path)
 273                         path = "emacsclient";
 274                 strbuf_addf(&man_page, "(woman \"%s\")", page);
 275                 execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL);
 276                 warning_errno(_("failed to exec '%s'"), path);
 277                 strbuf_release(&man_page);
 278         }
 279 }
 280
 281 static void exec_man_konqueror(const char *path, const char *page)
 282 {
 283         const char *display = getenv("DISPLAY");
 284         if (display && *display) {
 285                 struct strbuf man_page = STRBUF_INIT;
 286                 const char *filename = "kfmclient";
 287
 288                 /* It's simpler to launch konqueror using kfmclient. */
 289                 if (path) {
 290                         size_t len;
 291                         if (strip_suffix(path, "/konqueror", &len))
 292                                 path = xstrfmt("%.*s/kfmclient", (int)len, path);
 293                         filename = basename((char *)path);
 294                 } else
 295                         path = "kfmclient";
 296                 strbuf_addf(&man_page, "man:%s(1)", page);
 297                 execlp(path, filename, "newTab", man_page.buf, (char *)NULL);
 298                 warning_errno(_("failed to exec '%s'"), path);
 299                 strbuf_release(&man_page);
 300         }
 301 }
 302
 303 static void exec_man_man(const char *path, const char *page)
 304 {
 305         if (!path)
 306                 path = "man";
 307         execlp(path, "man", page, (char *)NULL);
 308         warning_errno(_("failed to exec '%s'"), path);
 309 }
 310
 311 static void exec_man_cmd(const char *cmd, const char *page)
 312 {
 313         struct strbuf shell_cmd = STRBUF_INIT;
 314         strbuf_addf(&shell_cmd, "%s %s", cmd, page);
 315         execl(SHELL_PATH, SHELL_PATH, "-c", shell_cmd.buf, (char *)NULL);
 316         warning(_("failed to exec '%s'"), cmd);
 317         strbuf_release(&shell_cmd);
 318 }
 319
 320 static void add_man_viewer(const char *name)
 321 {
 322         struct man_viewer_list **p = &man_viewer_list;
 323
 324         while (*p)
 325                 p = &((*p)->next);
 326         FLEX_ALLOC_STR(*p, name, name);
 327 }
 328
 329 static int supported_man_viewer(const char *name, size_t len)
 330 {
 331         return (!strncasecmp("man", name, len) ||
 332                 !strncasecmp("woman", name, len) ||
 333                 !strncasecmp("konqueror", name, len));
 334 }
 335
 336 static void do_add_man_viewer_info(const char *name,
 337                                    size_t len,
 338                                    const char *value)
 339 {
 340         struct man_viewer_info_list *new_man_viewer;
 341         FLEX_ALLOC_MEM(new_man_viewer, name, name, len);
 342         new_man_viewer->info = xstrdup(value);
 343         new_man_viewer->next = man_viewer_info_list;
 344         man_viewer_info_list = new_man_viewer;
 345 }
 346
 347 static int add_man_viewer_path(const char *name,
 348                                size_t len,
 349                                const char *value)
 350 {
 351         if (supported_man_viewer(name, len))
 352                 do_add_man_viewer_info(name, len, value);
 353         else
 354                 warning(_("'%s': path for unsupported man viewer.\n"
 355                           "Please consider using 'man.<tool>.cmd' instead."),
 356                         name);
 357
 358         return 0;
 359 }
 360
 361 static int add_man_viewer_cmd(const char *name,
 362                               size_t len,
 363                               const char *value)
 364 {
 365         if (supported_man_viewer(name, len))
 366                 warning(_("'%s': cmd for supported man viewer.\n"
 367                           "Please consider using 'man.<tool>.path' instead."),
 368                         name);
 369         else
 370                 do_add_man_viewer_info(name, len, value);
 371
 372         return 0;
 373 }
 374
 375 static int add_man_viewer_info(const char *var, const char *value)
 376 {
 377         const char *name, *subkey;
 378         size_t namelen;
 379
 380         if (parse_config_key(var, "man", &name, &namelen, &subkey) < 0 || !name)
 381                 return 0;
 382
 383         if (!strcmp(subkey, "path")) {
 384                 if (!value)
 385                         return config_error_nonbool(var);
 386                 return add_man_viewer_path(name, namelen, value);
 387         }
 388         if (!strcmp(subkey, "cmd")) {
 389                 if (!value)
 390                         return config_error_nonbool(var);
 391                 return add_man_viewer_cmd(name, namelen, value);
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int git_help_config(const char *var, const char *value, void *cb)
 398 {
 399         if (!strcmp(var, "help.format")) {
 400                 if (!value)
 401                         return config_error_nonbool(var);
 402                 help_format = parse_help_format(value);
 403                 return 0;
 404         }
 405         if (!strcmp(var, "help.htmlpath")) {
 406                 if (!value)
 407                         return config_error_nonbool(var);
 408                 html_path = xstrdup(value);
 409                 return 0;
 410         }
 411         if (!strcmp(var, "man.viewer")) {
 412                 if (!value)
 413                         return config_error_nonbool(var);
 414                 add_man_viewer(value);
 415                 return 0;
 416         }
 417         if (starts_with(var, "man."))
 418                 return add_man_viewer_info(var, value);
 419
 420         return git_default_config(var, value, cb);
 421 }
 422
 423 static struct cmdnames main_cmds, other_cmds;
 424
 425 static int is_git_command(const char *s)
 426 {
 427         if (is_builtin(s))
 428                 return 1;
 429
 430         load_command_list("git-", &main_cmds, &other_cmds);
 431         return is_in_cmdlist(&main_cmds, s) ||
 432                 is_in_cmdlist(&other_cmds, s);
 433 }
 434
 435 static const char *cmd_to_page(const char *git_cmd)
 436 {
 437         if (!git_cmd)
 438                 return "git";
 439         else if (starts_with(git_cmd, "git"))
 440                 return git_cmd;
 441         else if (is_git_command(git_cmd))
 442                 return xstrfmt("git-%s", git_cmd);
 443         else if (!strcmp("scalar", git_cmd))
 444                 return xstrdup(git_cmd);
 445         else
 446                 return xstrfmt("git%s", git_cmd);
 447 }
 448
 449 static void setup_man_path(void)
 450 {
 451         struct strbuf new_path = STRBUF_INIT;
 452         const char *old_path = getenv("MANPATH");
 453         char *git_man_path = system_path(GIT_MAN_PATH);
 454
 455         /* We should always put ':' after our path. If there is no
 456          * old_path, the ':' at the end will let 'man' to try
 457          * system-wide paths after ours to find the manual page. If
 458          * there is old_path, we need ':' as delimiter. */
 459         strbuf_addstr(&new_path, git_man_path);
 460         strbuf_addch(&new_path, ':');
 461         if (old_path)
 462                 strbuf_addstr(&new_path, old_path);
 463
 464         free(git_man_path);
 465         setenv("MANPATH", new_path.buf, 1);
 466
 467         strbuf_release(&new_path);
 468 }
 469
 470 static void exec_viewer(const char *name, const char *page)
 471 {
 472         const char *info = get_man_viewer_info(name);
 473
 474         if (!strcasecmp(name, "man"))
 475                 exec_man_man(info, page);
 476         else if (!strcasecmp(name, "woman"))
 477                 exec_woman_emacs(info, page);
 478         else if (!strcasecmp(name, "konqueror"))
 479                 exec_man_konqueror(info, page);
 480         else if (info)
 481                 exec_man_cmd(info, page);
 482         else
 483                 warning(_("'%s': unknown man viewer."), name);
 484 }
 485
 486 static void show_man_page(const char *page)
 487 {
 488         struct man_viewer_list *viewer;
 489         const char *fallback = getenv("GIT_MAN_VIEWER");
 490
 491         setup_man_path();
 492         for (viewer = man_viewer_list; viewer; viewer = viewer->next)
 493         {
 494                 exec_viewer(viewer->name, page); /* will return when unable */
 495         }
 496         if (fallback)
 497                 exec_viewer(fallback, page);
 498         exec_viewer("man", page);
 499         die(_("no man viewer handled the request"));
 500 }
 501
 502 static void show_info_page(const char *page)
 503 {
 504         setenv("INFOPATH", system_path(GIT_INFO_PATH), 1);
 505         execlp("info", "info", "gitman", page, (char *)NULL);
 506         die(_("no info viewer handled the request"));
 507 }
 508
 509 static void get_html_page_path(struct strbuf *page_path, const char *page)
 510 {
 511         struct stat st;
 512         char *to_free = NULL;
 513
 514         if (!html_path)
 515                 html_path = to_free = system_path(GIT_HTML_PATH);
 516
 517         /*
 518          * Check that the page we're looking for exists.
 519          */
 520         if (!strstr(html_path, "://")) {
 521                 if (stat(mkpath("%s/%s.html", html_path, page), &st)
 522                     || !S_ISREG(st.st_mode))
 523                         die("'%s/%s.html': documentation file not found.",
 524                                 html_path, page);
 525         }
 526
 527         strbuf_init(page_path, 0);
 528         strbuf_addf(page_path, "%s/%s.html", html_path, page);
 529         free(to_free);
 530 }
 531
 532 static void open_html(const char *path)
 533 {
 534         execl_git_cmd("web--browse", "-c", "help.browser", path, (char *)NULL);
 535 }
 536
 537 static void show_html_page(const char *page)
 538 {
 539         struct strbuf page_path; /* it leaks but we exec bellow */
 540
 541         get_html_page_path(&page_path, page);
 542
 543         open_html(page_path.buf);
 544 }
 545
 546 static const char *check_git_cmd(const char* cmd)
 547 {
 548         char *alias;
 549
 550         if (is_git_command(cmd))
 551                 return cmd;
 552
 553         alias = alias_lookup(cmd);
 554         if (alias) {
 555                 const char **argv;
 556                 int count;
 557
 558                 /*
 559                  * handle_builtin() in git.c rewrites "git cmd --help"
 560                  * to "git help --exclude-guides cmd", so we can use
 561                  * exclude_guides to distinguish "git cmd --help" from
 562                  * "git help cmd". In the latter case, or if cmd is an
 563                  * alias for a shell command, just print the alias
 564                  * definition.
 565                  */
 566                 if (!exclude_guides || alias[0] == '!') {
 567                         printf_ln(_("'%s' is aliased to '%s'"), cmd, alias);
 568                         free(alias);
 569                         exit(0);
 570                 }
 571                 /*
 572                  * Otherwise, we pretend that the command was "git
 573                  * word0 --help". We use split_cmdline() to get the
 574                  * first word of the alias, to ensure that we use the
 575                  * same rules as when the alias is actually
 576                  * used. split_cmdline() modifies alias in-place.
 577                  */
 578                 fprintf_ln(stderr, _("'%s' is aliased to '%s'"), cmd, alias);
 579                 count = split_cmdline(alias, &argv);
 580                 if (count < 0)
 581                         die(_("bad alias.%s string: %s"), cmd,
 582                             split_cmdline_strerror(count));
 583                 free(argv);
 584                 UNLEAK(alias);
 585                 return alias;
 586         }
 587
 588         if (exclude_guides)
 589                 return help_unknown_cmd(cmd);
 590
 591         return cmd;
 592 }
 593
 594 static void no_help_format(const char *opt_mode, enum help_format fmt)
 595 {
 596         const char *opt_fmt;
 597
 598         switch (fmt) {
 599         case HELP_FORMAT_NONE:
 600                 return;
 601         case HELP_FORMAT_MAN:
 602                 opt_fmt = "--man";
 603                 break;
 604         case HELP_FORMAT_INFO:
 605                 opt_fmt = "--info";
 606                 break;
 607         case HELP_FORMAT_WEB:
 608                 opt_fmt = "--web";
 609                 break;
 610         default:
 611                 BUG("unreachable");
 612         }
 613
 614         usage_msg_optf(_("options '%s' and '%s' cannot be used together"),
 615                        builtin_help_usage, builtin_help_options, opt_mode,
 616                        opt_fmt);
 617 }
 618
 619 static void opt_mode_usage(int argc, const char *opt_mode,
 620                            enum help_format fmt)
 621 {
 622         if (argc)
 623                 usage_msg_optf(_("the '%s' option doesn't take any non-option arguments"),
 624                                builtin_help_usage, builtin_help_options,
 625                                opt_mode);
 626
 627         no_help_format(opt_mode, fmt);
 628 }
 629
 630 int cmd_help(int argc, const char **argv, const char *prefix)
 631 {
 632         int nongit;
 633         enum help_format parsed_help_format;
 634         const char *page;
 635
 636         argc = parse_options(argc, argv, prefix, builtin_help_options,
 637                         builtin_help_usage, 0);
 638         parsed_help_format = help_format;
 639
 640         if (cmd_mode != HELP_ACTION_ALL &&
 641             (show_external_commands >= 0 ||
 642              show_aliases >= 0))
 643                 usage_msg_opt(_("the '--no-[external-commands|aliases]' options can only be used with '--all'"),
 644                               builtin_help_usage, builtin_help_options);
 645
 646         switch (cmd_mode) {
 647         case HELP_ACTION_ALL:
 648                 opt_mode_usage(argc, "--all", help_format);
 649                 if (verbose) {
 650                         setup_pager();
 651                         list_all_cmds_help(show_external_commands,
 652                                            show_aliases);
 653                         return 0;
 654                 }
 655                 printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 656                 load_command_list("git-", &main_cmds, &other_cmds);
 657                 list_commands(&main_cmds, &other_cmds);
 658                 printf("%s\n", _(git_more_info_string));
 659                 break;
 660         case HELP_ACTION_GUIDES:
 661                 opt_mode_usage(argc, "--guides", help_format);
 662                 list_guides_help();
 663                 printf("%s\n", _(git_more_info_string));
 664                 return 0;
 665         case HELP_ACTION_CONFIG_FOR_COMPLETION:
 666                 opt_mode_usage(argc, "--config-for-completion", help_format);
 667                 list_config_help(SHOW_CONFIG_VARS);
 668                 return 0;
 669         case HELP_ACTION_USER_INTERFACES:
 670                 opt_mode_usage(argc, "--user-interfaces", help_format);
 671                 list_user_interfaces_help();
 672                 return 0;
 673         case HELP_ACTION_DEVELOPER_INTERFACES:
 674                 opt_mode_usage(argc, "--developer-interfaces", help_format);
 675                 list_developer_interfaces_help();
 676                 return 0;
 677         case HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION:
 678                 opt_mode_usage(argc, "--config-sections-for-completion",
 679                                help_format);
 680                 list_config_help(SHOW_CONFIG_SECTIONS);
 681                 return 0;
 682         case HELP_ACTION_CONFIG:
 683                 opt_mode_usage(argc, "--config", help_format);
 684                 setup_pager();
 685                 list_config_help(SHOW_CONFIG_HUMAN);
 686                 printf("\n%s\n", _("'git help config' for more information"));
 687                 return 0;
 688         }
 689
 690         if (!argv[0]) {
 691                 printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 692                 list_common_cmds_help();
 693                 printf("\n%s\n", _(git_more_info_string));
 694                 return 0;
 695         }
 696
 697         setup_git_directory_gently(&nongit);
 698         git_config(git_help_config, NULL);
 699
 700         if (parsed_help_format != HELP_FORMAT_NONE)
 701                 help_format = parsed_help_format;
 702         if (help_format == HELP_FORMAT_NONE)
 703                 help_format = parse_help_format(DEFAULT_HELP_FORMAT);
 704
 705         argv[0] = check_git_cmd(argv[0]);
 706
 707         page = cmd_to_page(argv[0]);
 708         switch (help_format) {
 709         case HELP_FORMAT_NONE:
 710         case HELP_FORMAT_MAN:
 711                 show_man_page(page);
 712                 break;
 713         case HELP_FORMAT_INFO:
 714                 show_info_page(page);
 715                 break;
 716         case HELP_FORMAT_WEB:
 717                 show_html_page(page);
 718                 break;
 719         }
 720
 721         return 0;
 722 }