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 "pager.h"
  10 #include "parse-options.h"
  11 #include "path.h"
  12 #include "run-command.h"
  13 #include "config-list.h"
  14 #include "help.h"
  15 #include "alias.h"
  16 #include "setup.h"
  17
  18 #ifndef DEFAULT_HELP_FORMAT
  19 #define DEFAULT_HELP_FORMAT "man"
  20 #endif
  21
  22 static struct man_viewer_list {
  23         struct man_viewer_list *next;
  24         char name[FLEX_ARRAY];
  25 } *man_viewer_list;
  26
  27 static struct man_viewer_info_list {
  28         struct man_viewer_info_list *next;
  29         const char *info;
  30         char name[FLEX_ARRAY];
  31 } *man_viewer_info_list;
  32
  33 enum help_format {
  34         HELP_FORMAT_NONE,
  35         HELP_FORMAT_MAN,
  36         HELP_FORMAT_INFO,
  37         HELP_FORMAT_WEB
  38 };
  39
  40 enum show_config_type {
  41         SHOW_CONFIG_HUMAN,
  42         SHOW_CONFIG_VARS,
  43         SHOW_CONFIG_SECTIONS,
  44 };
  45
  46 static enum help_action {
  47         HELP_ACTION_ALL = 1,
  48         HELP_ACTION_GUIDES,
  49         HELP_ACTION_CONFIG,
  50         HELP_ACTION_USER_INTERFACES,
  51         HELP_ACTION_DEVELOPER_INTERFACES,
  52         HELP_ACTION_CONFIG_FOR_COMPLETION,
  53         HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION,
  54 } cmd_mode;
  55
  56 static const char *html_path;
  57 static int verbose = 1;
  58 static enum help_format help_format = HELP_FORMAT_NONE;
  59 static int exclude_guides;
  60 static int show_external_commands = -1;
  61 static int show_aliases = -1;
  62 static struct option builtin_help_options[] = {
  63         OPT_CMDMODE('a', "all", &cmd_mode, N_("print all available commands"),
  64                     HELP_ACTION_ALL),
  65         OPT_BOOL(0, "external-commands", &show_external_commands,
  66                  N_("show external commands in --all")),
  67         OPT_BOOL(0, "aliases", &show_aliases, N_("show aliases in --all")),
  68         OPT_HIDDEN_BOOL(0, "exclude-guides", &exclude_guides, N_("exclude guides")),
  69         OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN),
  70         OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"),
  71                         HELP_FORMAT_WEB),
  72         OPT_SET_INT('i', "info", &help_format, N_("show info page"),
  73                         HELP_FORMAT_INFO),
  74         OPT__VERBOSE(&verbose, N_("print command description")),
  75
  76         OPT_CMDMODE('g', "guides", &cmd_mode, N_("print list of useful guides"),
  77                     HELP_ACTION_GUIDES),
  78         OPT_CMDMODE(0, "user-interfaces", &cmd_mode,
  79                     N_("print list of user-facing repository, command and file interfaces"),
  80                     HELP_ACTION_USER_INTERFACES),
  81         OPT_CMDMODE(0, "developer-interfaces", &cmd_mode,
  82                     N_("print list of file formats, protocols and other developer interfaces"),
  83                     HELP_ACTION_DEVELOPER_INTERFACES),
  84         OPT_CMDMODE('c', "config", &cmd_mode, N_("print all configuration variable names"),
  85                     HELP_ACTION_CONFIG),
  86         OPT_CMDMODE_F(0, "config-for-completion", &cmd_mode, "",
  87                     HELP_ACTION_CONFIG_FOR_COMPLETION, PARSE_OPT_HIDDEN),
  88         OPT_CMDMODE_F(0, "config-sections-for-completion", &cmd_mode, "",
  89                     HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION, PARSE_OPT_HIDDEN),
  90
  91         OPT_END(),
  92 };
  93
  94 static const char * const builtin_help_usage[] = {
  95         "git help [-a|--all] [--[no-]verbose] [--[no-]external-commands] [--[no-]aliases]",
  96         N_("git help [[-i|--info] [-m|--man] [-w|--web]] [<command>|<doc>]"),
  97         "git help [-g|--guides]",
  98         "git help [-c|--config]",
  99         "git help [--user-interfaces]",
 100         "git help [--developer-interfaces]",
 101         NULL
 102 };
 103
 104 struct slot_expansion {
 105         const char *prefix;
 106         const char *placeholder;
 107         void (*fn)(struct string_list *list, const char *prefix);
 108         int found;
 109 };
 110
 111 static void list_config_help(enum show_config_type type)
 112 {
 113         struct slot_expansion slot_expansions[] = {
 114                 { "advice", "*", list_config_advices },
 115                 { "color.branch", "<slot>", list_config_color_branch_slots },
 116                 { "color.decorate", "<slot>", list_config_color_decorate_slots },
 117                 { "color.diff", "<slot>", list_config_color_diff_slots },
 118                 { "color.grep", "<slot>", list_config_color_grep_slots },
 119                 { "color.interactive", "<slot>", list_config_color_interactive_slots },
 120                 { "color.remote", "<slot>", list_config_color_sideband_slots },
 121                 { "color.status", "<slot>", list_config_color_status_slots },
 122                 { "fsck", "<msg-id>", list_config_fsck_msg_ids },
 123                 { "receive.fsck", "<msg-id>", list_config_fsck_msg_ids },
 124                 { NULL, NULL, NULL }
 125         };
 126         const char **p;
 127         struct slot_expansion *e;
 128         struct string_list keys = STRING_LIST_INIT_DUP;
 129         struct string_list keys_uniq = STRING_LIST_INIT_DUP;
 130         struct string_list_item *item;
 131         int i;
 132
 133         for (p = config_name_list; *p; p++) {
 134                 const char *var = *p;
 135                 struct strbuf sb = STRBUF_INIT;
 136
 137                 for (e = slot_expansions; e->prefix; e++) {
 138
 139                         strbuf_reset(&sb);
 140                         strbuf_addf(&sb, "%s.%s", e->prefix, e->placeholder);
 141                         if (!strcasecmp(var, sb.buf)) {
 142                                 e->fn(&keys, e->prefix);
 143                                 e->found++;
 144                                 break;
 145                         }
 146                 }
 147                 strbuf_release(&sb);
 148                 if (!e->prefix)
 149                         string_list_append(&keys, var);
 150         }
 151
 152         for (e = slot_expansions; e->prefix; e++)
 153                 if (!e->found)
 154                         BUG("slot_expansion %s.%s is not used",
 155                             e->prefix, e->placeholder);
 156
 157         string_list_sort(&keys);
 158         for (i = 0; i < keys.nr; i++) {
 159                 const char *var = keys.items[i].string;
 160                 const char *wildcard, *tag, *cut;
 161                 const char *dot = NULL;
 162                 struct strbuf sb = STRBUF_INIT;
 163
 164                 switch (type) {
 165                 case SHOW_CONFIG_HUMAN:
 166                         puts(var);
 167                         continue;
 168                 case SHOW_CONFIG_SECTIONS:
 169                         dot = strchr(var, '.');
 170                         break;
 171                 case SHOW_CONFIG_VARS:
 172                         break;
 173                 }
 174                 wildcard = strchr(var, '*');
 175                 tag = strchr(var, '<');
 176
 177                 if (!dot && !wildcard && !tag) {
 178                         string_list_append(&keys_uniq, var);
 179                         continue;
 180                 }
 181
 182                 if (dot)
 183                         cut = dot;
 184                 else if (wildcard && !tag)
 185                         cut = wildcard;
 186                 else if (!wildcard && tag)
 187                         cut = tag;
 188                 else
 189                         cut = wildcard < tag ? wildcard : tag;
 190
 191                 strbuf_add(&sb, var, cut - var);
 192                 string_list_append(&keys_uniq, sb.buf);
 193                 strbuf_release(&sb);
 194
 195         }
 196         string_list_clear(&keys, 0);
 197         string_list_remove_duplicates(&keys_uniq, 0);
 198         for_each_string_list_item(item, &keys_uniq)
 199                 puts(item->string);
 200         string_list_clear(&keys_uniq, 0);
 201 }
 202
 203 static enum help_format parse_help_format(const char *format)
 204 {
 205         if (!strcmp(format, "man"))
 206                 return HELP_FORMAT_MAN;
 207         if (!strcmp(format, "info"))
 208                 return HELP_FORMAT_INFO;
 209         if (!strcmp(format, "web") || !strcmp(format, "html"))
 210                 return HELP_FORMAT_WEB;
 211         /*
 212          * Please update _git_config() in git-completion.bash when you
 213          * add new help formats.
 214          */
 215         die(_("unrecognized help format '%s'"), format);
 216 }
 217
 218 static const char *get_man_viewer_info(const char *name)
 219 {
 220         struct man_viewer_info_list *viewer;
 221
 222         for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
 223         {
 224                 if (!strcasecmp(name, viewer->name))
 225                         return viewer->info;
 226         }
 227         return NULL;
 228 }
 229
 230 static int check_emacsclient_version(void)
 231 {
 232         struct strbuf buffer = STRBUF_INIT;
 233         struct child_process ec_process = CHILD_PROCESS_INIT;
 234         int version;
 235
 236         /* emacsclient prints its version number on stderr */
 237         strvec_pushl(&ec_process.args, "emacsclient", "--version", NULL);
 238         ec_process.err = -1;
 239         ec_process.stdout_to_stderr = 1;
 240         if (start_command(&ec_process))
 241                 return error(_("Failed to start emacsclient."));
 242
 243         strbuf_read(&buffer, ec_process.err, 20);
 244         close(ec_process.err);
 245
 246         /*
 247          * Don't bother checking return value, because "emacsclient --version"
 248          * seems to always exits with code 1.
 249          */
 250         finish_command(&ec_process);
 251
 252         if (!starts_with(buffer.buf, "emacsclient")) {
 253                 strbuf_release(&buffer);
 254                 return error(_("Failed to parse emacsclient version."));
 255         }
 256
 257         strbuf_remove(&buffer, 0, strlen("emacsclient"));
 258         version = atoi(buffer.buf);
 259
 260         if (version < 22) {
 261                 strbuf_release(&buffer);
 262                 return error(_("emacsclient version '%d' too old (< 22)."),
 263                         version);
 264         }
 265
 266         strbuf_release(&buffer);
 267         return 0;
 268 }
 269
 270 static void exec_woman_emacs(const char *path, const char *page)
 271 {
 272         if (!check_emacsclient_version()) {
 273                 /* This works only with emacsclient version >= 22. */
 274                 struct strbuf man_page = STRBUF_INIT;
 275
 276                 if (!path)
 277                         path = "emacsclient";
 278                 strbuf_addf(&man_page, "(woman \"%s\")", page);
 279                 execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL);
 280                 warning_errno(_("failed to exec '%s'"), path);
 281                 strbuf_release(&man_page);
 282         }
 283 }
 284
 285 static void exec_man_konqueror(const char *path, const char *page)
 286 {
 287         const char *display = getenv("DISPLAY");
 288         if (display && *display) {
 289                 struct strbuf man_page = STRBUF_INIT;
 290                 const char *filename = "kfmclient";
 291
 292                 /* It's simpler to launch konqueror using kfmclient. */
 293                 if (path) {
 294                         size_t len;
 295                         if (strip_suffix(path, "/konqueror", &len))
 296                                 path = xstrfmt("%.*s/kfmclient", (int)len, path);
 297                         filename = basename((char *)path);
 298                 } else
 299                         path = "kfmclient";
 300                 strbuf_addf(&man_page, "man:%s(1)", page);
 301                 execlp(path, filename, "newTab", man_page.buf, (char *)NULL);
 302                 warning_errno(_("failed to exec '%s'"), path);
 303                 strbuf_release(&man_page);
 304         }
 305 }
 306
 307 static void exec_man_man(const char *path, const char *page)
 308 {
 309         if (!path)
 310                 path = "man";
 311         execlp(path, "man", page, (char *)NULL);
 312         warning_errno(_("failed to exec '%s'"), path);
 313 }
 314
 315 static void exec_man_cmd(const char *cmd, const char *page)
 316 {
 317         struct strbuf shell_cmd = STRBUF_INIT;
 318         strbuf_addf(&shell_cmd, "%s %s", cmd, page);
 319         execl(SHELL_PATH, SHELL_PATH, "-c", shell_cmd.buf, (char *)NULL);
 320         warning(_("failed to exec '%s'"), cmd);
 321         strbuf_release(&shell_cmd);
 322 }
 323
 324 static void add_man_viewer(const char *name)
 325 {
 326         struct man_viewer_list **p = &man_viewer_list;
 327
 328         while (*p)
 329                 p = &((*p)->next);
 330         FLEX_ALLOC_STR(*p, name, name);
 331 }
 332
 333 static int supported_man_viewer(const char *name, size_t len)
 334 {
 335         return (!strncasecmp("man", name, len) ||
 336                 !strncasecmp("woman", name, len) ||
 337                 !strncasecmp("konqueror", name, len));
 338 }
 339
 340 static void do_add_man_viewer_info(const char *name,
 341                                    size_t len,
 342                                    const char *value)
 343 {
 344         struct man_viewer_info_list *new_man_viewer;
 345         FLEX_ALLOC_MEM(new_man_viewer, name, name, len);
 346         new_man_viewer->info = xstrdup(value);
 347         new_man_viewer->next = man_viewer_info_list;
 348         man_viewer_info_list = new_man_viewer;
 349 }
 350
 351 static int add_man_viewer_path(const char *name,
 352                                size_t len,
 353                                const char *value)
 354 {
 355         if (supported_man_viewer(name, len))
 356                 do_add_man_viewer_info(name, len, value);
 357         else
 358                 warning(_("'%s': path for unsupported man viewer.\n"
 359                           "Please consider using 'man.<tool>.cmd' instead."),
 360                         name);
 361
 362         return 0;
 363 }
 364
 365 static int add_man_viewer_cmd(const char *name,
 366                               size_t len,
 367                               const char *value)
 368 {
 369         if (supported_man_viewer(name, len))
 370                 warning(_("'%s': cmd for supported man viewer.\n"
 371                           "Please consider using 'man.<tool>.path' instead."),
 372                         name);
 373         else
 374                 do_add_man_viewer_info(name, len, value);
 375
 376         return 0;
 377 }
 378
 379 static int add_man_viewer_info(const char *var, const char *value)
 380 {
 381         const char *name, *subkey;
 382         size_t namelen;
 383
 384         if (parse_config_key(var, "man", &name, &namelen, &subkey) < 0 || !name)
 385                 return 0;
 386
 387         if (!strcmp(subkey, "path")) {
 388                 if (!value)
 389                         return config_error_nonbool(var);
 390                 return add_man_viewer_path(name, namelen, value);
 391         }
 392         if (!strcmp(subkey, "cmd")) {
 393                 if (!value)
 394                         return config_error_nonbool(var);
 395                 return add_man_viewer_cmd(name, namelen, value);
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int git_help_config(const char *var, const char *value, void *cb)
 402 {
 403         if (!strcmp(var, "help.format")) {
 404                 if (!value)
 405                         return config_error_nonbool(var);
 406                 help_format = parse_help_format(value);
 407                 return 0;
 408         }
 409         if (!strcmp(var, "help.htmlpath")) {
 410                 if (!value)
 411                         return config_error_nonbool(var);
 412                 html_path = xstrdup(value);
 413                 return 0;
 414         }
 415         if (!strcmp(var, "man.viewer")) {
 416                 if (!value)
 417                         return config_error_nonbool(var);
 418                 add_man_viewer(value);
 419                 return 0;
 420         }
 421         if (starts_with(var, "man."))
 422                 return add_man_viewer_info(var, value);
 423
 424         return git_default_config(var, value, cb);
 425 }
 426
 427 static struct cmdnames main_cmds, other_cmds;
 428
 429 static int is_git_command(const char *s)
 430 {
 431         if (is_builtin(s))
 432                 return 1;
 433
 434         load_command_list("git-", &main_cmds, &other_cmds);
 435         return is_in_cmdlist(&main_cmds, s) ||
 436                 is_in_cmdlist(&other_cmds, s);
 437 }
 438
 439 static const char *cmd_to_page(const char *git_cmd)
 440 {
 441         if (!git_cmd)
 442                 return "git";
 443         else if (starts_with(git_cmd, "git"))
 444                 return git_cmd;
 445         else if (is_git_command(git_cmd))
 446                 return xstrfmt("git-%s", git_cmd);
 447         else if (!strcmp("scalar", git_cmd))
 448                 return xstrdup(git_cmd);
 449         else
 450                 return xstrfmt("git%s", git_cmd);
 451 }
 452
 453 static void setup_man_path(void)
 454 {
 455         struct strbuf new_path = STRBUF_INIT;
 456         const char *old_path = getenv("MANPATH");
 457         char *git_man_path = system_path(GIT_MAN_PATH);
 458
 459         /* We should always put ':' after our path. If there is no
 460          * old_path, the ':' at the end will let 'man' to try
 461          * system-wide paths after ours to find the manual page. If
 462          * there is old_path, we need ':' as delimiter. */
 463         strbuf_addstr(&new_path, git_man_path);
 464         strbuf_addch(&new_path, ':');
 465         if (old_path)
 466                 strbuf_addstr(&new_path, old_path);
 467
 468         free(git_man_path);
 469         setenv("MANPATH", new_path.buf, 1);
 470
 471         strbuf_release(&new_path);
 472 }
 473
 474 static void exec_viewer(const char *name, const char *page)
 475 {
 476         const char *info = get_man_viewer_info(name);
 477
 478         if (!strcasecmp(name, "man"))
 479                 exec_man_man(info, page);
 480         else if (!strcasecmp(name, "woman"))
 481                 exec_woman_emacs(info, page);
 482         else if (!strcasecmp(name, "konqueror"))
 483                 exec_man_konqueror(info, page);
 484         else if (info)
 485                 exec_man_cmd(info, page);
 486         else
 487                 warning(_("'%s': unknown man viewer."), name);
 488 }
 489
 490 static void show_man_page(const char *page)
 491 {
 492         struct man_viewer_list *viewer;
 493         const char *fallback = getenv("GIT_MAN_VIEWER");
 494
 495         setup_man_path();
 496         for (viewer = man_viewer_list; viewer; viewer = viewer->next)
 497         {
 498                 exec_viewer(viewer->name, page); /* will return when unable */
 499         }
 500         if (fallback)
 501                 exec_viewer(fallback, page);
 502         exec_viewer("man", page);
 503         die(_("no man viewer handled the request"));
 504 }
 505
 506 static void show_info_page(const char *page)
 507 {
 508         setenv("INFOPATH", system_path(GIT_INFO_PATH), 1);
 509         execlp("info", "info", "gitman", page, (char *)NULL);
 510         die(_("no info viewer handled the request"));
 511 }
 512
 513 static void get_html_page_path(struct strbuf *page_path, const char *page)
 514 {
 515         struct stat st;
 516         char *to_free = NULL;
 517
 518         if (!html_path)
 519                 html_path = to_free = system_path(GIT_HTML_PATH);
 520
 521         /*
 522          * Check that the page we're looking for exists.
 523          */
 524         if (!strstr(html_path, "://")) {
 525                 if (stat(mkpath("%s/%s.html", html_path, page), &st)
 526                     || !S_ISREG(st.st_mode))
 527                         die("'%s/%s.html': documentation file not found.",
 528                                 html_path, page);
 529         }
 530
 531         strbuf_init(page_path, 0);
 532         strbuf_addf(page_path, "%s/%s.html", html_path, page);
 533         free(to_free);
 534 }
 535
 536 static void open_html(const char *path)
 537 {
 538         execl_git_cmd("web--browse", "-c", "help.browser", path, (char *)NULL);
 539 }
 540
 541 static void show_html_page(const char *page)
 542 {
 543         struct strbuf page_path; /* it leaks but we exec bellow */
 544
 545         get_html_page_path(&page_path, page);
 546
 547         open_html(page_path.buf);
 548 }
 549
 550 static const char *check_git_cmd(const char* cmd)
 551 {
 552         char *alias;
 553
 554         if (is_git_command(cmd))
 555                 return cmd;
 556
 557         alias = alias_lookup(cmd);
 558         if (alias) {
 559                 const char **argv;
 560                 int count;
 561
 562                 /*
 563                  * handle_builtin() in git.c rewrites "git cmd --help"
 564                  * to "git help --exclude-guides cmd", so we can use
 565                  * exclude_guides to distinguish "git cmd --help" from
 566                  * "git help cmd". In the latter case, or if cmd is an
 567                  * alias for a shell command, just print the alias
 568                  * definition.
 569                  */
 570                 if (!exclude_guides || alias[0] == '!') {
 571                         printf_ln(_("'%s' is aliased to '%s'"), cmd, alias);
 572                         free(alias);
 573                         exit(0);
 574                 }
 575                 /*
 576                  * Otherwise, we pretend that the command was "git
 577                  * word0 --help". We use split_cmdline() to get the
 578                  * first word of the alias, to ensure that we use the
 579                  * same rules as when the alias is actually
 580                  * used. split_cmdline() modifies alias in-place.
 581                  */
 582                 fprintf_ln(stderr, _("'%s' is aliased to '%s'"), cmd, alias);
 583                 count = split_cmdline(alias, &argv);
 584                 if (count < 0)
 585                         die(_("bad alias.%s string: %s"), cmd,
 586                             split_cmdline_strerror(count));
 587                 free(argv);
 588                 UNLEAK(alias);
 589                 return alias;
 590         }
 591
 592         if (exclude_guides)
 593                 return help_unknown_cmd(cmd);
 594
 595         return cmd;
 596 }
 597
 598 static void no_help_format(const char *opt_mode, enum help_format fmt)
 599 {
 600         const char *opt_fmt;
 601
 602         switch (fmt) {
 603         case HELP_FORMAT_NONE:
 604                 return;
 605         case HELP_FORMAT_MAN:
 606                 opt_fmt = "--man";
 607                 break;
 608         case HELP_FORMAT_INFO:
 609                 opt_fmt = "--info";
 610                 break;
 611         case HELP_FORMAT_WEB:
 612                 opt_fmt = "--web";
 613                 break;
 614         default:
 615                 BUG("unreachable");
 616         }
 617
 618         usage_msg_optf(_("options '%s' and '%s' cannot be used together"),
 619                        builtin_help_usage, builtin_help_options, opt_mode,
 620                        opt_fmt);
 621 }
 622
 623 static void opt_mode_usage(int argc, const char *opt_mode,
 624                            enum help_format fmt)
 625 {
 626         if (argc)
 627                 usage_msg_optf(_("the '%s' option doesn't take any non-option arguments"),
 628                                builtin_help_usage, builtin_help_options,
 629                                opt_mode);
 630
 631         no_help_format(opt_mode, fmt);
 632 }
 633
 634 int cmd_help(int argc, const char **argv, const char *prefix)
 635 {
 636         int nongit;
 637         enum help_format parsed_help_format;
 638         const char *page;
 639
 640         argc = parse_options(argc, argv, prefix, builtin_help_options,
 641                         builtin_help_usage, 0);
 642         parsed_help_format = help_format;
 643
 644         if (cmd_mode != HELP_ACTION_ALL &&
 645             (show_external_commands >= 0 ||
 646              show_aliases >= 0))
 647                 usage_msg_opt(_("the '--no-[external-commands|aliases]' options can only be used with '--all'"),
 648                               builtin_help_usage, builtin_help_options);
 649
 650         switch (cmd_mode) {
 651         case HELP_ACTION_ALL:
 652                 opt_mode_usage(argc, "--all", help_format);
 653                 if (verbose) {
 654                         setup_pager();
 655                         list_all_cmds_help(show_external_commands,
 656                                            show_aliases);
 657                         return 0;
 658                 }
 659                 printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 660                 load_command_list("git-", &main_cmds, &other_cmds);
 661                 list_commands(&main_cmds, &other_cmds);
 662                 printf("%s\n", _(git_more_info_string));
 663                 break;
 664         case HELP_ACTION_GUIDES:
 665                 opt_mode_usage(argc, "--guides", help_format);
 666                 list_guides_help();
 667                 printf("%s\n", _(git_more_info_string));
 668                 return 0;
 669         case HELP_ACTION_CONFIG_FOR_COMPLETION:
 670                 opt_mode_usage(argc, "--config-for-completion", help_format);
 671                 list_config_help(SHOW_CONFIG_VARS);
 672                 return 0;
 673         case HELP_ACTION_USER_INTERFACES:
 674                 opt_mode_usage(argc, "--user-interfaces", help_format);
 675                 list_user_interfaces_help();
 676                 return 0;
 677         case HELP_ACTION_DEVELOPER_INTERFACES:
 678                 opt_mode_usage(argc, "--developer-interfaces", help_format);
 679                 list_developer_interfaces_help();
 680                 return 0;
 681         case HELP_ACTION_CONFIG_SECTIONS_FOR_COMPLETION:
 682                 opt_mode_usage(argc, "--config-sections-for-completion",
 683                                help_format);
 684                 list_config_help(SHOW_CONFIG_SECTIONS);
 685                 return 0;
 686         case HELP_ACTION_CONFIG:
 687                 opt_mode_usage(argc, "--config", help_format);
 688                 setup_pager();
 689                 list_config_help(SHOW_CONFIG_HUMAN);
 690                 printf("\n%s\n", _("'git help config' for more information"));
 691                 return 0;
 692         }
 693
 694         if (!argv[0]) {
 695                 printf(_("usage: %s%s"), _(git_usage_string), "\n\n");
 696                 list_common_cmds_help();
 697                 printf("\n%s\n", _(git_more_info_string));
 698                 return 0;
 699         }
 700
 701         setup_git_directory_gently(&nongit);
 702         git_config(git_help_config, NULL);
 703
 704         if (parsed_help_format != HELP_FORMAT_NONE)
 705                 help_format = parsed_help_format;
 706         if (help_format == HELP_FORMAT_NONE)
 707                 help_format = parse_help_format(DEFAULT_HELP_FORMAT);
 708
 709         argv[0] = check_git_cmd(argv[0]);
 710
 711         page = cmd_to_page(argv[0]);
 712         switch (help_format) {
 713         case HELP_FORMAT_NONE:
 714         case HELP_FORMAT_MAN:
 715                 show_man_page(page);
 716                 break;
 717         case HELP_FORMAT_INFO:
 718                 show_info_page(page);
 719                 break;
 720         case HELP_FORMAT_WEB:
 721                 show_html_page(page);
 722                 break;
 723         }
 724
 725         return 0;
 726 }