/* * builtin-help.c * * Builtin help command */ #include "util/cache.h" #include "builtin.h" #include "util/exec_cmd.h" #include "common-cmds.h" #include "util/parse-options.h" #include "util/run-command.h" #include "util/help.h" 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_MAN, HELP_FORMAT_INFO, HELP_FORMAT_WEB, }; static int show_all = 0; static enum help_format help_format = HELP_FORMAT_MAN; static struct option builtin_help_options[] = { OPT_BOOLEAN('a', "all", &show_all, "print all available commands"), OPT_SET_INT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN), OPT_SET_INT('w', "web", &help_format, "show manual in web browser", HELP_FORMAT_WEB), OPT_SET_INT('i', "info", &help_format, "show info page", HELP_FORMAT_INFO), OPT_END(), }; static const char * const builtin_help_usage[] = { "perf help [--all] [--man|--web|--info] [command]", 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; const char *argv_ec[] = { "emacsclient", "--version", NULL }; int version; /* emacsclient prints its version number on stderr */ memset(&ec_process, 0, sizeof(ec_process)); ec_process.argv = argv_ec; ec_process.err = -1; ec_process.stdout_to_stderr = 1; if (start_command(&ec_process)) { fprintf(stderr, "Failed to start emacsclient.\n"); return -1; } 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 (prefixcmp(buffer.buf, "emacsclient")) { fprintf(stderr, "Failed to parse emacsclient version.\n"); strbuf_release(&buffer); return -1; } strbuf_remove(&buffer, 0, strlen("emacsclient")); version = atoi(buffer.buf); if (version < 22) { fprintf(stderr, "emacsclient version '%d' too old (< 22).\n", version); strbuf_release(&buffer); return -1; } 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, 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) { const char *file = strrchr(path, '/'); if (file && !strcmp(file + 1, "konqueror")) { char *new = strdup(path); char *dest = strrchr(new, '/'); /* strlen("konqueror") == strlen("kfmclient") */ strcpy(dest + 1, "kfmclient"); path = new; } if (file) filename = file; } else path = "kfmclient"; strbuf_addf(&man_page, "man:%s(1)", page); execlp(path, filename, "newTab", man_page.buf, 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, 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("/bin/sh", "sh", "-c", shell_cmd.buf, 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 = calloc(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 = calloc(1, sizeof(*new) + len + 1); strncpy(new->name, name, len); new->info = strdup(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.<tool>.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.<tool>.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 = var + 4; const char *subkey = strrchr(name, '.'); if (!subkey) return error("Config with no key for man viewer: %s", name); if (!strcmp(subkey, ".path")) { if (!value) return config_error_nonbool(var); return add_man_viewer_path(name, subkey - name, value); } if (!strcmp(subkey, ".cmd")) { if (!value) return config_error_nonbool(var); return add_man_viewer_cmd(name, subkey - name, value); } warning("'%s': unsupported man viewer sub key.", subkey); return 0; } static int perf_help_config(const char *var, const char *value, void *cb) { if (!strcmp(var, "help.format")) { if (!value) return config_error_nonbool(var); help_format = parse_help_format(value); return 0; } if (!strcmp(var, "man.viewer")) { if (!value) return config_error_nonbool(var); add_man_viewer(value); return 0; } if (!prefixcmp(var, "man.")) return add_man_viewer_info(var, value); return perf_default_config(var, value, cb); } static struct cmdnames main_cmds, other_cmds; void list_common_cmds_help(void) { int i, longest = 0; for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { if (longest < strlen(common_cmds[i].name)) longest = strlen(common_cmds[i].name); } puts(" The most commonly used perf commands are:"); for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { printf(" %s ", common_cmds[i].name); mput_char(' ', longest - strlen(common_cmds[i].name)); puts(common_cmds[i].help); } } static int is_perf_command(const char *s) { return is_in_cmdlist(&main_cmds, s) || is_in_cmdlist(&other_cmds, s); } static const char *prepend(const char *prefix, const char *cmd) { size_t pre_len = strlen(prefix); size_t cmd_len = strlen(cmd); char *p = malloc(pre_len + cmd_len + 1); memcpy(p, prefix, pre_len); strcpy(p + pre_len, cmd); return p; } static const char *cmd_to_page(const char *perf_cmd) { if (!perf_cmd) return "perf"; else if (!prefixcmp(perf_cmd, "perf")) return perf_cmd; else if (is_perf_command(perf_cmd)) return prepend("perf-", perf_cmd); else return prepend("perf-", perf_cmd); } static void setup_man_path(void) { struct strbuf new_path = STRBUF_INIT; const char *old_path = getenv("MANPATH"); /* 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, system_path(PERF_MAN_PATH)); strbuf_addch(&new_path, ':'); if (old_path) strbuf_addstr(&new_path, old_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 *perf_cmd) { struct man_viewer_list *viewer; const char *page = cmd_to_page(perf_cmd); const char *fallback = getenv("PERF_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 *perf_cmd) { const char *page = cmd_to_page(perf_cmd); setenv("INFOPATH", system_path(PERF_INFO_PATH), 1); execlp("info", "info", "perfman", page, NULL); } static void get_html_page_path(struct strbuf *page_path, const char *page) { struct stat st; const char *html_path = system_path(PERF_HTML_PATH); /* Check that we have a perf documentation directory. */ if (stat(mkpath("%s/perf.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); } /* * 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_perf_cmd("web--browse", "-c", "help.browser", path, NULL); } #endif static void show_html_page(const char *perf_cmd) { const char *page = cmd_to_page(perf_cmd); struct strbuf page_path; /* it leaks but we exec bellow */ get_html_page_path(&page_path, page); open_html(page_path.buf); } int cmd_help(int argc, const char **argv, const char *prefix) { const char *alias; load_command_list("perf-", &main_cmds, &other_cmds); perf_config(perf_help_config, NULL); argc = parse_options(argc, argv, builtin_help_options, builtin_help_usage, 0); if (show_all) { printf("\n usage: %s\n\n", perf_usage_string); list_commands("perf commands", &main_cmds, &other_cmds); printf(" %s\n\n", perf_more_info_string); return 0; } if (!argv[0]) { printf("\n usage: %s\n\n", perf_usage_string); list_common_cmds_help(); printf("\n %s\n\n", perf_more_info_string); return 0; } alias = alias_lookup(argv[0]); if (alias && !is_perf_command(argv[0])) { printf("`perf %s' is aliased to `%s'\n", argv[0], alias); return 0; } switch (help_format) { 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; }