/* * Builtin help command */ #include "cache.h" #include "builtin.h" #include "exec_cmd.h" #include "parse-options.h" #include "run-command.h" #include "column.h" #include "help.h" #ifndef DEFAULT_HELP_FORMAT #define DEFAULT_HELP_FORMAT "man" #endif static struct man_viewer_list { struct man_viewer_list *next; char name[FLEX_ARRAY]; } *man_viewer_list; static struct man_viewer_info_list { struct man_viewer_info_list *next; const char *info; char name[FLEX_ARRAY]; } *man_viewer_info_list; enum help_format { HELP_FORMAT_NONE, HELP_FORMAT_MAN, HELP_FORMAT_INFO, HELP_FORMAT_WEB }; static const char *html_path; static int show_all = 0; static int show_guides = 0; static unsigned int colopts; static enum help_format help_format = HELP_FORMAT_NONE; static struct option builtin_help_options[] = { OPT_BOOL('a', "all", &show_all, N_("print all available commands")), OPT_BOOL('g', "guides", &show_guides, N_("print list of useful guides")), OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN), OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"), HELP_FORMAT_WEB), OPT_SET_INT('i', "info", &help_format, N_("show info page"), HELP_FORMAT_INFO), OPT_END(), }; static const char * const builtin_help_usage[] = { N_("git help [--all] [--guides] [--man | --web | --info] []"), NULL }; static enum help_format parse_help_format(const char *format) { if (!strcmp(format, "man")) return HELP_FORMAT_MAN; if (!strcmp(format, "info")) return HELP_FORMAT_INFO; if (!strcmp(format, "web") || !strcmp(format, "html")) return HELP_FORMAT_WEB; die(_("unrecognized help format '%s'"), format); } static const char *get_man_viewer_info(const char *name) { struct man_viewer_info_list *viewer; for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) { if (!strcasecmp(name, viewer->name)) return viewer->info; } return NULL; } static int check_emacsclient_version(void) { struct strbuf buffer = STRBUF_INIT; struct child_process ec_process = CHILD_PROCESS_INIT; const char *argv_ec[] = { "emacsclient", "--version", NULL }; int version; /* emacsclient prints its version number on stderr */ ec_process.argv = argv_ec; ec_process.err = -1; ec_process.stdout_to_stderr = 1; if (start_command(&ec_process)) return error(_("Failed to start emacsclient.")); strbuf_read(&buffer, ec_process.err, 20); close(ec_process.err); /* * Don't bother checking return value, because "emacsclient --version" * seems to always exits with code 1. */ finish_command(&ec_process); if (!starts_with(buffer.buf, "emacsclient")) { strbuf_release(&buffer); return error(_("Failed to parse emacsclient version.")); } strbuf_remove(&buffer, 0, strlen("emacsclient")); version = atoi(buffer.buf); if (version < 22) { strbuf_release(&buffer); return error(_("emacsclient version '%d' too old (< 22)."), version); } strbuf_release(&buffer); return 0; } static void exec_woman_emacs(const char *path, const char *page) { if (!check_emacsclient_version()) { /* This works only with emacsclient version >= 22. */ struct strbuf man_page = STRBUF_INIT; if (!path) path = "emacsclient"; strbuf_addf(&man_page, "(woman \"%s\")", page); execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL); warning(_("failed to exec '%s': %s"), path, strerror(errno)); } } static void exec_man_konqueror(const char *path, const char *page) { const char *display = getenv("DISPLAY"); if (display && *display) { struct strbuf man_page = STRBUF_INIT; const char *filename = "kfmclient"; /* It's simpler to launch konqueror using kfmclient. */ if (path) { size_t len; if (strip_suffix(path, "/konqueror", &len)) path = xstrfmt("%.*s/kfmclient", (int)len, path); filename = basename((char *)path); } else path = "kfmclient"; strbuf_addf(&man_page, "man:%s(1)", page); execlp(path, filename, "newTab", man_page.buf, (char *)NULL); warning(_("failed to exec '%s': %s"), path, strerror(errno)); } } static void exec_man_man(const char *path, const char *page) { if (!path) path = "man"; execlp(path, "man", page, (char *)NULL); warning(_("failed to exec '%s': %s"), path, strerror(errno)); } static void exec_man_cmd(const char *cmd, const char *page) { struct strbuf shell_cmd = STRBUF_INIT; strbuf_addf(&shell_cmd, "%s %s", cmd, page); execl(SHELL_PATH, SHELL_PATH, "-c", shell_cmd.buf, (char *)NULL); warning(_("failed to exec '%s': %s"), cmd, strerror(errno)); } static void add_man_viewer(const char *name) { struct man_viewer_list **p = &man_viewer_list; size_t len = strlen(name); while (*p) p = &((*p)->next); *p = xcalloc(1, (sizeof(**p) + len + 1)); strncpy((*p)->name, name, len); } static int supported_man_viewer(const char *name, size_t len) { return (!strncasecmp("man", name, len) || !strncasecmp("woman", name, len) || !strncasecmp("konqueror", name, len)); } static void do_add_man_viewer_info(const char *name, size_t len, const char *value) { struct man_viewer_info_list *new = xcalloc(1, sizeof(*new) + len + 1); strncpy(new->name, name, len); new->info = xstrdup(value); new->next = man_viewer_info_list; man_viewer_info_list = new; } static int add_man_viewer_path(const char *name, size_t len, const char *value) { if (supported_man_viewer(name, len)) do_add_man_viewer_info(name, len, value); else warning(_("'%s': path for unsupported man viewer.\n" "Please consider using 'man..cmd' instead."), name); return 0; } static int add_man_viewer_cmd(const char *name, size_t len, const char *value) { if (supported_man_viewer(name, len)) warning(_("'%s': cmd for supported man viewer.\n" "Please consider using 'man..path' instead."), name); else do_add_man_viewer_info(name, len, value); return 0; } static int add_man_viewer_info(const char *var, const char *value) { const char *name, *subkey; int namelen; if (parse_config_key(var, "man", &name, &namelen, &subkey) < 0 || !name) return 0; if (!strcmp(subkey, "path")) { if (!value) return config_error_nonbool(var); return add_man_viewer_path(name, namelen, value); } if (!strcmp(subkey, "cmd")) { if (!value) return config_error_nonbool(var); return add_man_viewer_cmd(name, namelen, value); } return 0; } static int git_help_config(const char *var, const char *value, void *cb) { if (starts_with(var, "column.")) return git_column_config(var, value, "help", &colopts); if (!strcmp(var, "help.format")) { if (!value) return config_error_nonbool(var); help_format = parse_help_format(value); return 0; } if (!strcmp(var, "help.htmlpath")) { if (!value) return config_error_nonbool(var); html_path = xstrdup(value); return 0; } if (!strcmp(var, "man.viewer")) { if (!value) return config_error_nonbool(var); add_man_viewer(value); return 0; } if (starts_with(var, "man.")) return add_man_viewer_info(var, value); return git_default_config(var, value, cb); } static struct cmdnames main_cmds, other_cmds; static int is_git_command(const char *s) { if (is_builtin(s)) return 1; load_command_list("git-", &main_cmds, &other_cmds); return is_in_cmdlist(&main_cmds, s) || is_in_cmdlist(&other_cmds, s); } static const char *cmd_to_page(const char *git_cmd) { if (!git_cmd) return "git"; else if (starts_with(git_cmd, "git")) return git_cmd; else if (is_git_command(git_cmd)) return xstrfmt("git-%s", git_cmd); else return xstrfmt("git%s", git_cmd); } static void setup_man_path(void) { struct strbuf new_path = STRBUF_INIT; const char *old_path = getenv("MANPATH"); char *git_man_path = system_path(GIT_MAN_PATH); /* We should always put ':' after our path. If there is no * old_path, the ':' at the end will let 'man' to try * system-wide paths after ours to find the manual page. If * there is old_path, we need ':' as delimiter. */ strbuf_addstr(&new_path, git_man_path); strbuf_addch(&new_path, ':'); if (old_path) strbuf_addstr(&new_path, old_path); free(git_man_path); setenv("MANPATH", new_path.buf, 1); strbuf_release(&new_path); } static void exec_viewer(const char *name, const char *page) { const char *info = get_man_viewer_info(name); if (!strcasecmp(name, "man")) exec_man_man(info, page); else if (!strcasecmp(name, "woman")) exec_woman_emacs(info, page); else if (!strcasecmp(name, "konqueror")) exec_man_konqueror(info, page); else if (info) exec_man_cmd(info, page); else warning(_("'%s': unknown man viewer."), name); } static void show_man_page(const char *git_cmd) { struct man_viewer_list *viewer; const char *page = cmd_to_page(git_cmd); const char *fallback = getenv("GIT_MAN_VIEWER"); setup_man_path(); for (viewer = man_viewer_list; viewer; viewer = viewer->next) { exec_viewer(viewer->name, page); /* will return when unable */ } if (fallback) exec_viewer(fallback, page); exec_viewer("man", page); die(_("no man viewer handled the request")); } static void show_info_page(const char *git_cmd) { const char *page = cmd_to_page(git_cmd); setenv("INFOPATH", system_path(GIT_INFO_PATH), 1); execlp("info", "info", "gitman", page, (char *)NULL); die(_("no info viewer handled the request")); } static void get_html_page_path(struct strbuf *page_path, const char *page) { struct stat st; char *to_free = NULL; if (!html_path) html_path = to_free = system_path(GIT_HTML_PATH); /* Check that we have a git documentation directory. */ if (!strstr(html_path, "://")) { if (stat(mkpath("%s/git.html", html_path), &st) || !S_ISREG(st.st_mode)) die("'%s': not a documentation directory.", html_path); } strbuf_init(page_path, 0); strbuf_addf(page_path, "%s/%s.html", html_path, page); free(to_free); } /* * If open_html is not defined in a platform-specific way (see for * example compat/mingw.h), we use the script web--browse to display * HTML. */ #ifndef open_html static void open_html(const char *path) { execl_git_cmd("web--browse", "-c", "help.browser", path, (char *)NULL); } #endif static void show_html_page(const char *git_cmd) { const char *page = cmd_to_page(git_cmd); struct strbuf page_path; /* it leaks but we exec bellow */ get_html_page_path(&page_path, page); open_html(page_path.buf); } static struct { const char *name; const char *help; } common_guides[] = { { "attributes", N_("Defining attributes per path") }, { "everyday", N_("Everyday Git With 20 Commands Or So") }, { "glossary", N_("A Git glossary") }, { "ignore", N_("Specifies intentionally untracked files to ignore") }, { "modules", N_("Defining submodule properties") }, { "revisions", N_("Specifying revisions and ranges for Git") }, { "tutorial", N_("A tutorial introduction to Git (for version 1.5.1 or newer)") }, { "workflows", N_("An overview of recommended workflows with Git") }, }; static void list_common_guides_help(void) { int i, longest = 0; for (i = 0; i < ARRAY_SIZE(common_guides); i++) { if (longest < strlen(common_guides[i].name)) longest = strlen(common_guides[i].name); } puts(_("The common Git guides are:\n")); for (i = 0; i < ARRAY_SIZE(common_guides); i++) { printf(" %s ", common_guides[i].name); mput_char(' ', longest - strlen(common_guides[i].name)); puts(_(common_guides[i].help)); } putchar('\n'); } int cmd_help(int argc, const char **argv, const char *prefix) { int nongit; char *alias; enum help_format parsed_help_format; argc = parse_options(argc, argv, prefix, builtin_help_options, builtin_help_usage, 0); parsed_help_format = help_format; if (show_all) { git_config(git_help_config, NULL); printf(_("usage: %s%s"), _(git_usage_string), "\n\n"); load_command_list("git-", &main_cmds, &other_cmds); list_commands(colopts, &main_cmds, &other_cmds); } if (show_guides) list_common_guides_help(); if (show_all || show_guides) { printf("%s\n", _(git_more_info_string)); /* * We're done. Ignore any remaining args */ return 0; } if (!argv[0]) { printf(_("usage: %s%s"), _(git_usage_string), "\n\n"); list_common_cmds_help(); printf("\n%s\n", _(git_more_info_string)); return 0; } setup_git_directory_gently(&nongit); git_config(git_help_config, NULL); if (parsed_help_format != HELP_FORMAT_NONE) help_format = parsed_help_format; if (help_format == HELP_FORMAT_NONE) help_format = parse_help_format(DEFAULT_HELP_FORMAT); alias = alias_lookup(argv[0]); if (alias && !is_git_command(argv[0])) { printf_ln(_("`git %s' is aliased to `%s'"), argv[0], alias); free(alias); return 0; } switch (help_format) { case HELP_FORMAT_NONE: case HELP_FORMAT_MAN: show_man_page(argv[0]); break; case HELP_FORMAT_INFO: show_info_page(argv[0]); break; case HELP_FORMAT_WEB: show_html_page(argv[0]); break; } return 0; }