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 "gettext.h"
   9 #include "parse-options.h"
  10 #include "run-command.h"
  11 #include "config-list.h"
  12 #include "help.h"
  13 #include "alias.h"
  14 #include "setup.h"
  15
  16 #ifndef DEFAULT_HELP_FORMAT
  17 #define DEFAULT_HELP_FORMAT "man"
  18 #endif
  19
  20 static struct man_viewer_list {
  21         struct man_viewer_list *next;
  22         char name[FLEX_ARRAY];
  23 } *man_viewer_list;
  24
  25 static struct man_viewer_info_list {
  26         struct man_viewer_info_list *next;
  27         const char *info;
  28         char name[FLEX_ARRAY];
  29 } *man_viewer_info_list;
  30
  31 enum help_format {
  32         HELP_FORMAT_NONE,
  33         HELP_FORMAT_MAN,
  34         HELP_FORMAT_INFO,
  35         HELP_FORMAT_WEB
  36 };
  37
  38 enum show_config_type {
  39         SHOW_CONFIG_HUMAN,
  40         SHOW_CONFIG_VARS,
  41         SHOW_CONFIG_SECTIONS,
  42 };
  43
  44 static enum help_action {
  45         HELP_ACTION_ALL = 1,
  46         HELP_ACTION_GUIDES,
  47         HELP_ACTION_CONFIG,
  48         HELP_ACTION_USER_INTERFACES,
  49         HELP_ACTION_DEVELOPER_INTERFACES,
  50         HELP_ACTION_CONFIG_FOR_COMPLETION,
  51         HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION,
  52 } cmd_mode;
  53
  54 static const char *html_path;
  55 static int verbose = 1;
  56 static enum help_format help_format = HELP_FORMAT_NONE;
  57 static int exclude_guides;
  58 static int show_external_commands = -1;
  59 static int show_aliases = -1;
  60 static struct option builtin_help_options[] = {
  61         OPT_CMDMODE('a', "all", &cmd_mode, N_("print all available commands"),
  62                     HELP_ACTION_ALL),
  63         OPT_BOOL(0, "external-commands", &show_external_commands,
  64                  N_("show external commands in --all")),
  65         OPT_BOOL(0, "aliases", &show_aliases, N_("show aliases in --all")),
  66         OPT_HIDDEN_BOOL(0, "exclude-guides", &exclude_guides, N_("exclude guides")),
  67         OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN),
  68         OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"),
  69                         HELP_FORMAT_WEB),
  70         OPT_SET_INT('i', "info", &help_format, N_("show info page"),
  71                         HELP_FORMAT_INFO),
  72         OPT__VERBOSE(&verbose, N_("print command description")),
  73
  74         OPT_CMDMODE('g', "guides", &cmd_mode, N_("print list of useful guides"),
  75                     HELP_ACTION_GUIDES),
  76         OPT_CMDMODE(0, "user-interfaces", &cmd_mode,
  77                     N_("print list of user-facing repository, command and file interfaces"),
  78                     HELP_ACTION_USER_INTERFACES),
  79         OPT_CMDMODE(0, "developer-interfaces", &cmd_mode,
  80                     N_("print list of file formats, protocols and other developer interfaces"),
  81                     HELP_ACTION_DEVELOPER_INTERFACES),
  82         OPT_CMDMODE('c', "config", &cmd_mode, N_("print all configuration variable names"),
  83                     HELP_ACTION_CONFIG),
  84         OPT_CMDMODE_F(0, "config-for-completion", &cmd_mode, "",
  85                     HELP_ACTION_CONFIG_FOR_COMPLETION, PARSE_OPT_HIDDEN),
  86         OPT_CMDMODE_F(0, "config-sections-for-completion", &cmd_mode, "",
  87                     HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION, PARSE_OPT_HIDDEN),
  88
  89         OPT_END(),
  90 };
  91
  92 static const char * const builtin_help_usage[] = {
  93         "git help [-a|--all] [--[no-]verbose] [--[no-]external-commands] [--[no-]aliases]",
  94         N_("git help [[-i|--info] [-m|--man] [-w|--web]] [<command>|<doc>]"),
  95         "git help [-g|--guides]",
  96         "git help [-c|--config]",
  97         "git help [--user-interfaces]",
  98         "git help [--developer-interfaces]",
  99         NULL
 100 };
 101
 102 struct slot_expansion {
 103         const char *prefix;
 104         const char *placeholder;
 105         void (*fn)(struct string_list *list, const char *prefix);
 106         int found;
 107 };
 108
 109 static void list_config_help(enum show_config_type type)
 110 {
 111         struct slot_expansion slot_expansions[] = {
 112                 { "advice", "*", list_config_advices },
 113                 { "color.branch", "<slot>", list_config_color_branch_slots },
 114                 { "color.decorate", "<slot>", list_config_color_decorate_slots },
 115                 { "color.diff", "<slot>", list_config_color_diff_slots },
 116                 { "color.grep", "<slot>", list_config_color_grep_slots },
 117                 { "color.interactive", "<slot>", list_config_color_interactive_slots },
 118                 { "color.remote", "<slot>", list_config_color_sideband_slots },
 119                 { "color.status", "<slot>", list_config_color_status_slots },
 120                 { "fsck", "<msg-id>", list_config_fsck_msg_ids },
 121                 { "receive.fsck", "<msg-id>", list_config_fsck_msg_ids },
 122                 { NULL, NULL, NULL }
 123         };
 124         const char **p;
 125         struct slot_expansion *e;
 126         struct string_list keys = STRING_LIST_INIT_DUP;
 127         struct string_list keys_uniq = STRING_LIST_INIT_DUP;
 128         struct string_list_item *item;
 129         int i;
 130
 131         for (p = config_name_list; *p; p++) {
 132                 const char *var = *p;
 133                 struct strbuf sb = STRBUF_INIT;
 134
 135                 for (e = slot_expansions; e->prefix; e++) {
 136
 137                         strbuf_reset(&sb);
 138                         strbuf_addf(&sb, "%s.%s", e->prefix, e->placeholder);
 139                         if (!strcasecmp(var, sb.buf)) {
 140                                 e->fn(&keys, e->prefix);
 141                                 e->found++;
 142                                 break;
 143                         }
 144                 }
 145                 strbuf_release(&sb);
 146                 if (!e->prefix)
 147                         string_list_append(&keys, var);
 148         }
 149
 150         for (e = slot_expansions; e->prefix; e++)
 151                 if (!e->found)
 152                         BUG("slot_expansion %s.%s is not used",
 153                             e->prefix, e->placeholder);
 154
 155         string_list_sort(&keys);
 156         for (i = 0; i < keys.nr; i++) {
 157                 const char *var = keys.items[i].string;
 158                 const char *wildcard, *tag, *cut;
 159                 const char *dot = NULL;
 160                 struct strbuf sb = STRBUF_INIT;
 161
 162                 switch (type) {
 163                 case SHOW_CONFIG_HUMAN:
 164                         puts(var);
 165                         continue;
 166                 case SHOW_CONFIG_SECTIONS:
 167                         dot = strchr(var, '.');
 168                         break;
 169                 case SHOW_CONFIG_VARS:
 170                         break;
 171                 }
 172                 wildcard = strchr(var, '*');
 173                 tag = strchr(var, '<');
 174
 175                 if (!dot && !wildcard && !tag) {
 176                         string_list_append(&keys_uniq, var);
 177                         continue;
 178                 }
 179
 180                 if (dot)
 181                         cut = dot;
 182                 else if (wildcard && !tag)
 183                         cut = wildcard;
 184                 else if (!wildcard && tag)
 185                         cut = tag;
 186                 else
 187                         cut = wildcard < tag ? wildcard : tag;
 188
 189                 strbuf_add(&sb, var, cut - var);
 190                 string_list_append(&keys_uniq, sb.buf);
 191                 strbuf_release(&sb);
 192
 193         }
 194         string_list_clear(&keys, 0);
 195         string_list_remove_duplicates(&keys_uniq, 0);
 196         for_each_string_list_item(item, &keys_uniq)
 197                 puts(item->string);
 198         string_list_clear(&keys_uniq, 0);
 199 }
 200
 201 static enum help_format parse_help_format(const char *format)
 202 {
 203         if (!strcmp(format, "man"))
 204                 return HELP_FORMAT_MAN;
 205         if (!strcmp(format, "info"))
 206                 return HELP_FORMAT_INFO;
 207         if (!strcmp(format, "web") || !strcmp(format, "html"))
 208                 return HELP_FORMAT_WEB;
 209         /*
 210          * Please update _git_config() in git-completion.bash when you
 211          * add new help formats.
 212          */
 213         die(_("unrecognized help format '%s'"), format);
 214 }
 215
 216 static const char *get_man_viewer_info(const char *name)
 217 {
 218         struct man_viewer_info_list *viewer;
 219
 220         for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
 221         {
 222                 if (!strcasecmp(name, viewer->name))
 223                         return viewer->info;
 224         }
 225         return NULL;
 226 }
 227
 228 static int check_emacsclient_version(void)
 229 {
 230         struct strbuf buffer = STRBUF_INIT;
 231         struct child_process ec_process = CHILD_PROCESS_INIT;
 232         int version;
 233
 234         /* emacsclient prints its version number on stderr */
 235         strvec_pushl(&ec_process.args, "emacsclient", "--version", NULL);
 236         ec_process.err = -1;
 237         ec_process.stdout_to_stderr = 1;
 238         if (start_command(&ec_process))
 239                 return error(_("Failed to start emacsclient."));
 240
 241         strbuf_read(&buffer, ec_process.err, 20);
 242         close(ec_process.err);
 243
 244         /*
 245          * Don't bother checking return value, because "emacsclient --version"
 246          * seems to always exits with code 1.
 247          */
 248         finish_command(&ec_process);
 249
 250         if (!starts_with(buffer.buf, "emacsclient")) {
 251                 strbuf_release(&buffer);
 252                 return error(_("Failed to parse emacsclient version."));
 253         }
 254
 255         strbuf_remove(&buffer, 0, strlen("emacsclient"));
 256         version = atoi(buffer.buf);
 257
 258         if (version < 22) {
 259                 strbuf_release(&buffer);
 260                 return error(_("emacsclient version '%d' too old (< 22)."),
 261                         version);
 262         }
 263
 264         strbuf_release(&buffer);
 265         return 0;
 266 }
 267
 268 static void exec_woman_emacs(const char *path, const char *page)
 269 {
 270         if (!check_emacsclient_version()) {
 271                 /* This works only with emacsclient version >= 22. */
 272                 struct strbuf man_page = STRBUF_INIT;
 273
 274                 if (!path)
 275                         path = "emacsclient";
 276                 strbuf_addf(&man_page, "(woman \"%s\")", page);
 277                 execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL);
 278                 warning_errno(_("failed to exec '%s'"), path);
 279                 strbuf_release(&man_page);
 280         }
 281 }
 282
 283 static void exec_man_konqueror(const char *path, const char *page)
 284 {
 285         const char *display = getenv("DISPLAY");
 286         if (display && *display) {
 287                 struct strbuf man_page = STRBUF_INIT;
 288                 const char *filename = "kfmclient";
 289
 290                 /* It's simpler to launch konqueror using kfmclient. */
 291                 if (path) {
 292                         size_t len;
 293                         if (strip_suffix(path, "/konqueror", &len))
 294                                 path = xstrfmt("%.*s/kfmclient", (int)len, path);
 295                         filename = basename((char *)path);
 296                 } else
 297                         path = "kfmclient";
 298                 strbuf_addf(&man_page, "man:%s(1)", page);
 299                 execlp(path, filename, "newTab", man_page.buf, (char *)NULL);
 300                 warning_errno(_("failed to exec '%s'"), path);
 301                 strbuf_release(&man_page);
 302         }
 303 }
 304
 305 static void exec_man_man(const char *path, const char *page)
 306 {
 307         if (!path)
 308                 path = "man";
 309         execlp(path, "man", page, (char *)NULL);
 310         warning_errno(_("failed to exec '%s'"), path);
 311 }
 312
 313 static void exec_man_cmd(const char *cmd, const char *page)
 314 {
 315         struct strbuf shell_cmd = STRBUF_INIT;
 316         strbuf_addf(&shell_cmd, "%s %s", cmd, page);
 317         execl(SHELL_PATH, SHELL_PATH, "-c", shell_cmd.buf, (char *)NULL);
 318         warning(_("failed to exec '%s'"), cmd);
 319         strbuf_release(&shell_cmd);
 320 }
 321
 322 static void add_man_viewer(const char *name)
 323 {
 324         struct man_viewer_list **p = &man_viewer_list;
 325
 326         while (*p)
 327                 p = &((*p)->next);
 328         FLEX_ALLOC_STR(*p, name, name);
 329 }
 330
 331 static int supported_man_viewer(const char *name, size_t len)
 332 {
 333         return (!strncasecmp("man", name, len) ||
 334                 !strncasecmp("woman", name, len) ||
 335                 !strncasecmp("konqueror", name, len));
 336 }
 337
 338 static void do_add_man_viewer_info(const char *name,
 339                                    size_t len,
 340                                    const char *value)
 341 {
 342         struct man_viewer_info_list *new_man_viewer;
 343         FLEX_ALLOC_MEM(new_man_viewer, name, name, len);
 344         new_man_viewer->info = xstrdup(value);
 345         new_man_viewer->next = man_viewer_info_list;
 346         man_viewer_info_list = new_man_viewer;
 347 }
 348
 349 static int add_man_viewer_path(const char *name,
 350                                size_t len,
 351                                const char *value)
 352 {
 353         if (supported_man_viewer(name, len))
 354                 do_add_man_viewer_info(name, len, value);
 355         else
 356                 warning(_("'%s': path for unsupported man viewer.\n"
 357                           "Please consider using 'man.<tool>.cmd' instead."),
 358                         name);
 359
 360         return 0;
 361 }
 362
 363 static int add_man_viewer_cmd(const char *name,
 364                               size_t len,
 365                               const char *value)
 366 {
 367         if (supported_man_viewer(name, len))
 368                 warning(_("'%s': cmd for supported man viewer.\n"
 369                           "Please consider using 'man.<tool>.path' instead."),
 370                         name);
 371         else
 372                 do_add_man_viewer_info(name, len, value);
 373
 374         return 0;
 375 }
 376
 377 static int add_man_viewer_info(const char *var, const char *value)
 378 {
 379         const char *name, *subkey;
 380         size_t namelen;
 381
 382         if (parse_config_key(var, "man", &name, &namelen, &subkey) < 0 || !name)
 383                 return 0;
 384
 385         if (!strcmp(subkey, "path")) {
 386                 if (!value)
 387                         return config_error_nonbool(var);
 388                 return add_man_viewer_path(name, namelen, value);
 389         }
 390         if (!strcmp(subkey, "cmd")) {
 391                 if (!value)
 392                         return config_error_nonbool(var);
 393                 return add_man_viewer_cmd(name, namelen, value);
 394         }
 395
 396         return 0;
 397 }
 398
 399 static int git_help_config(const char *var, const char *value, void *cb)
 400 {
 401         if (!strcmp(var, "help.format")) {
 402                 if (!value)
 403                         return config_error_nonbool(var);
 404                 help_format = parse_help_format(value);
 405                 return 0;
 406         }
 407         if (!strcmp(var, "help.htmlpath")) {
 408                 if (!value)
 409                         return config_error_nonbool(var);
 410                 html_path = xstrdup(value);
 411                 return 0;
 412         }
 413         if (!strcmp(var, "man.viewer")) {
 414                 if (!value)
 415                         return config_error_nonbool(var);
 416                 add_man_viewer(value);
 417                 return 0;
 418         }
 419         if (starts_with(var, "man."))
 420                 return add_man_viewer_info(var, value);
 421
 422         return git_default_config(var, value, cb);
 423 }
 424
 425 static struct cmdnames main_cmds, other_cmds;
 426
 427 static int is_git_command(const char *s)
 428 {
 429         if (is_builtin(s))
 430                 return 1;
 431
 432         load_command_list("git-", &main_cmds, &other_cmds);
 433         return is_in_cmdlist(&main_cmds, s) ||
 434                 is_in_cmdlist(&other_cmds, s);
 435 }
 436
 437 static const char *cmd_to_page(const char *git_cmd)
 438 {
 439         if (!git_cmd)
 440                 return "git";
 441         else if (starts_with(git_cmd, "git"))
 442                 return git_cmd;
 443         else if (is_git_command(git_cmd))
 444                 return xstrfmt("git-%s", git_cmd);
 445         else if (!strcmp("scalar", git_cmd))
 446                 return xstrdup(git_cmd);
 447         else
 448                 return xstrfmt("git%s", git_cmd);
 449 }
 450
 451 static void setup_man_path(void)
 452 {
 453         struct strbuf new_path = STRBUF_INIT;
 454         const char *old_path = getenv("MANPATH");
 455         char *git_man_path = system_path(GIT_MAN_PATH);
 456
 457         /* We should always put ':' after our path. If there is no
 458          * old_path, the ':' at the end will let 'man' to try
 459          * system-wide paths after ours to find the manual page. If
 460          * there is old_path, we need ':' as delimiter. */
 461         strbuf_addstr(&new_path, git_man_path);
 462         strbuf_addch(&new_path, ':');
 463         if (old_path)
 464                 strbuf_addstr(&new_path, old_path);
 465
 466         free(git_man_path);
 467         setenv("MANPATH", new_path.buf, 1);
 468
 469         strbuf_release(&new_path);
 470 }
 471
 472 static void exec_viewer(const char *name, const char *page)
 473 {
 474         const char *info = get_man_viewer_info(name);
 475
 476         if (!strcasecmp(name, "man"))
 477                 exec_man_man(info, page);
 478         else if (!strcasecmp(name, "woman"))
 479                 exec_woman_emacs(info, page);
 480         else if (!strcasecmp(name, "konqueror"))
 481                 exec_man_konqueror(info, page);
 482         else if (info)
 483                 exec_man_cmd(info, page);
 484         else
 485                 warning(_("'%s': unknown man viewer."), name);
 486 }
 487
 488 static void show_man_page(const char *page)
 489 {
 490         struct man_viewer_list *viewer;
 491         const char *fallback = getenv("GIT_MAN_VIEWER");
 492
 493         setup_man_path();
 494         for (viewer = man_viewer_list; viewer; viewer = viewer->next)
 495         {
 496                 exec_viewer(viewer->name, page); /* will return when unable */
 497         }
 498         if (fallback)
 499                 exec_viewer(fallback, page);
 500         exec_viewer("man", page);
 501         die(_("no man viewer handled the request"));
 502 }
 503
 504 static void show_info_page(const char *page)
 505 {
 506         setenv("INFOPATH", system_path(GIT_INFO_PATH), 1);
 507         execlp("info", "info", "gitman", page, (char *)NULL);
 508         die(_("no info viewer handled the request"));
 509 }
 510
 511 static void get_html_page_path(struct strbuf *page_path, const char *page)
 512 {
 513         struct stat st;
 514         char *to_free = NULL;
 515
 516         if (!html_path)
 517                 html_path = to_free = system_path(GIT_HTML_PATH);
 518
 519         /*
 520          * Check that the page we're looking for exists.
 521          */
 522         if (!strstr(html_path, "://")) {
 523                 if (stat(mkpath("%s/%s.html", html_path, page), &st)
 524                     || !S_ISREG(st.st_mode))
 525                         die("'%s/%s.html': documentation file not found.",
 526                                 html_path, page);
 527         }
 528
 529         strbuf_init(page_path, 0);
 530         strbuf_addf(page_path, "%s/%s.html", html_path, page);
 531         free(to_free);
 532 }
 533
 534 static void open_html(const char *path)
 535 {
 536         execl_git_cmd("web--browse", "-c", "help.browser", path, (char *)NULL);
 537 }
 538
 539 static void show_html_page(const char *page)
 540 {
 541         struct strbuf page_path; /* it leaks but we exec bellow */
 542
 543         get_html_page_path(&page_path, page);
 544
 545         open_html(page_path.buf);
 546 }
 547
 548 static const char *check_git_cmd(const char* cmd)
 549 {
 550         char *alias;
 551
 552         if (is_git_command(cmd))
 553                 return cmd;
 554
 555         alias = alias_lookup(cmd);
 556         if (alias) {
 557                 const char **argv;
 558                 int count;
 559
 560                 /*
 561                  * handle_builtin() in git.c rewrites "git cmd --help"
 562                  * to "git help --exclude-guides cmd", so we can use
 563                  * exclude_guides to distinguish "git cmd --help" from
 564                  * "git help cmd". In the latter case, or if cmd is an
 565                  * alias for a shell command, just print the alias
 566                  * definition.
 567                  */
 568                 if (!exclude_guides || alias[0] == '!') {
 569                         printf_ln(_("'%s' is aliased to '%s'"), cmd, alias);
 570                         free(alias);
 571                         exit(0);
 572                 }
 573                 /*
 574                  * Otherwise, we pretend that the command was "git
 575                  * word0 --help". We use split_cmdline() to get the
 576                  * first word of the alias, to ensure that we use the
 577                  * same rules as when the alias is actually
 578                  * used. split_cmdline() modifies alias in-place.
 579                  */
 580                 fprintf_ln(stderr, _("'%s' is aliased to '%s'"), cmd, alias);
 581                 count = split_cmdline(alias, &argv);
 582                 if (count < 0)
 583                         die(_("bad alias.%s string: %s"), cmd,
 584                             split_cmdline_strerror(count));
 585                 free(argv);
 586                 UNLEAK(alias);
 587                 return alias;
 588         }
 589
 590         if (exclude_guides)
 591                 return help_unknown_cmd(cmd);
 592
 593         return cmd;
 594 }
 595
 596 static void no_help_format(const char *opt_mode, enum help_format fmt)
 597 {
 598         const char *opt_fmt;
 599
 600         switch (fmt) {
 601         case HELP_FORMAT_NONE:
 602                 return;
 603         case HELP_FORMAT_MAN:
 604                 opt_fmt = "--man";
 605                 break;
 606         case HELP_FORMAT_INFO:
 607                 opt_fmt = "--info";
 608                 break;
 609         case HELP_FORMAT_WEB:
 610                 opt_fmt = "--web";
 611                 break;
 612         default:
 613                 BUG("unreachable");
 614         }
 615
 616         usage_msg_optf(_("options '%s' and '%s' cannot be used together"),
 617                        builtin_help_usage, builtin_help_options, opt_mode,
 618                        opt_fmt);
 619 }
 620
 621 static void opt_mode_usage(int argc, const char *opt_mode,
 622                            enum help_format fmt)
 623 {
 624         if (argc)
 625                 usage_msg_optf(_("the '%s' option doesn't take any non-option arguments"),
 626                                builtin_help_usage, builtin_help_options,
 627                                opt_mode);
 628
 629         no_help_format(opt_mode, fmt);
 630 }
 631
 632 int cmd_help(int argc, const char **argv, const char *prefix)
 633 {
 634         int nongit;
 635         enum help_format parsed_help_format;
 636         const char *page;
 637
 638         argc = parse_options(argc, argv, prefix, builtin_help_options,
 639                         builtin_help_usage, 0);
 640         parsed_help_format = help_format;
 641
 642         if (cmd_mode != HELP_ACTION_ALL &&
 643             (show_external_commands >= 0 ||
 644              show_aliases >= 0))
 645                 usage_msg_opt(_("the '--no-[external-commands|aliases]' options can only be used with '--all'"),
 646                               builtin_help_usage, builtin_help_options);
 647
 648         switch (cmd_mode) {
 649         case HELP_ACTION_ALL:
 650                 opt_mode_usage(argc, "--all", help_format);
 651                 if (verbose) {
 652                         setup_pager();
 653                         list_all_cmds_help(show_external_commands,
 654                                            show_aliases);
 655                         return 0;
 656                 }
 657                 printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 658                 load_command_list("git-", &main_cmds, &other_cmds);
 659                 list_commands(&main_cmds, &other_cmds);
 660                 printf("%s\n", _(git_more_info_string));
 661                 break;
 662         case HELP_ACTION_GUIDES:
 663                 opt_mode_usage(argc, "--guides", help_format);
 664                 list_guides_help();
 665                 printf("%s\n", _(git_more_info_string));
 666                 return 0;
 667         case HELP_ACTION_CONFIG_FOR_COMPLETION:
 668                 opt_mode_usage(argc, "--config-for-completion", help_format);
 669                 list_config_help(SHOW_CONFIG_VARS);
 670                 return 0;
 671         case HELP_ACTION_USER_INTERFACES:
 672                 opt_mode_usage(argc, "--user-interfaces", help_format);
 673                 list_user_interfaces_help();
 674                 return 0;
 675         case HELP_ACTION_DEVELOPER_INTERFACES:
 676                 opt_mode_usage(argc, "--developer-interfaces", help_format);
 677                 list_developer_interfaces_help();
 678                 return 0;
 679         case HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION:
 680                 opt_mode_usage(argc, "--config-sections-for-completion",
 681                                help_format);
 682                 list_config_help(SHOW_CONFIG_SECTIONS);
 683                 return 0;
 684         case HELP_ACTION_CONFIG:
 685                 opt_mode_usage(argc, "--config", help_format);
 686                 setup_pager();
 687                 list_config_help(SHOW_CONFIG_HUMAN);
 688                 printf("\n%s\n", _("'git help config' for more information"));
 689                 return 0;
 690         }
 691
 692         if (!argv[0]) {
 693                 printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 694                 list_common_cmds_help();
 695                 printf("\n%s\n", _(git_more_info_string));
 696                 return 0;
 697         }
 698
 699         setup_git_directory_gently(&nongit);
 700         git_config(git_help_config, NULL);
 701
 702         if (parsed_help_format != HELP_FORMAT_NONE)
 703                 help_format = parsed_help_format;
 704         if (help_format == HELP_FORMAT_NONE)
 705                 help_format = parse_help_format(DEFAULT_HELP_FORMAT);
 706
 707         argv[0] = check_git_cmd(argv[0]);
 708
 709         page = cmd_to_page(argv[0]);
 710         switch (help_format) {
 711         case HELP_FORMAT_NONE:
 712         case HELP_FORMAT_MAN:
 713                 show_man_page(page);
 714                 break;
 715         case HELP_FORMAT_INFO:
 716                 show_info_page(page);
 717                 break;
 718         case HELP_FORMAT_WEB:
 719                 show_html_page(page);
 720                 break;
 721         }
 722
 723         return 0;
 724 }