496 lines
12 KiB
C
496 lines
12 KiB
C
/*
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* builtin-help.c
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*
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* Builtin help command
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*/
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#include "perf.h"
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#include "util/cache.h"
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#include "builtin.h"
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#include <subcmd/exec-cmd.h>
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#include "common-cmds.h"
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#include <subcmd/parse-options.h>
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#include <subcmd/run-command.h>
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#include <subcmd/help.h>
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#include "util/debug.h"
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static struct man_viewer_list {
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struct man_viewer_list *next;
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char name[FLEX_ARRAY];
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} *man_viewer_list;
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static struct man_viewer_info_list {
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struct man_viewer_info_list *next;
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const char *info;
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char name[FLEX_ARRAY];
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} *man_viewer_info_list;
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enum help_format {
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HELP_FORMAT_NONE,
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HELP_FORMAT_MAN,
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HELP_FORMAT_INFO,
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HELP_FORMAT_WEB,
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};
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static enum help_format parse_help_format(const char *format)
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{
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if (!strcmp(format, "man"))
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return HELP_FORMAT_MAN;
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if (!strcmp(format, "info"))
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return HELP_FORMAT_INFO;
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if (!strcmp(format, "web") || !strcmp(format, "html"))
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return HELP_FORMAT_WEB;
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pr_err("unrecognized help format '%s'", format);
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return HELP_FORMAT_NONE;
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}
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static const char *get_man_viewer_info(const char *name)
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{
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struct man_viewer_info_list *viewer;
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for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
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if (!strcasecmp(name, viewer->name))
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return viewer->info;
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}
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return NULL;
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}
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static int check_emacsclient_version(void)
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{
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struct strbuf buffer = STRBUF_INIT;
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struct child_process ec_process;
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const char *argv_ec[] = { "emacsclient", "--version", NULL };
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int version;
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/* emacsclient prints its version number on stderr */
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memset(&ec_process, 0, sizeof(ec_process));
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ec_process.argv = argv_ec;
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ec_process.err = -1;
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ec_process.stdout_to_stderr = 1;
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if (start_command(&ec_process)) {
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fprintf(stderr, "Failed to start emacsclient.\n");
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return -1;
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}
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strbuf_read(&buffer, ec_process.err, 20);
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close(ec_process.err);
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/*
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* Don't bother checking return value, because "emacsclient --version"
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* seems to always exits with code 1.
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*/
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finish_command(&ec_process);
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if (prefixcmp(buffer.buf, "emacsclient")) {
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fprintf(stderr, "Failed to parse emacsclient version.\n");
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strbuf_release(&buffer);
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return -1;
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}
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version = atoi(buffer.buf + strlen("emacsclient"));
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if (version < 22) {
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fprintf(stderr,
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"emacsclient version '%d' too old (< 22).\n",
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version);
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strbuf_release(&buffer);
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return -1;
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}
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strbuf_release(&buffer);
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return 0;
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}
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static void exec_woman_emacs(const char *path, const char *page)
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{
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char sbuf[STRERR_BUFSIZE];
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if (!check_emacsclient_version()) {
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/* This works only with emacsclient version >= 22. */
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char *man_page;
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if (!path)
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path = "emacsclient";
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if (asprintf(&man_page, "(woman \"%s\")", page) > 0) {
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execlp(path, "emacsclient", "-e", man_page, NULL);
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free(man_page);
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}
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warning("failed to exec '%s': %s", path,
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strerror_r(errno, sbuf, sizeof(sbuf)));
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}
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}
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static void exec_man_konqueror(const char *path, const char *page)
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{
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const char *display = getenv("DISPLAY");
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if (display && *display) {
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char *man_page;
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const char *filename = "kfmclient";
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char sbuf[STRERR_BUFSIZE];
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/* It's simpler to launch konqueror using kfmclient. */
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if (path) {
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const char *file = strrchr(path, '/');
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if (file && !strcmp(file + 1, "konqueror")) {
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char *new = strdup(path);
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char *dest = strrchr(new, '/');
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/* strlen("konqueror") == strlen("kfmclient") */
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strcpy(dest + 1, "kfmclient");
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path = new;
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}
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if (file)
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filename = file;
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} else
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path = "kfmclient";
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if (asprintf(&man_page, "man:%s(1)", page) > 0) {
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execlp(path, filename, "newTab", man_page, NULL);
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free(man_page);
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}
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warning("failed to exec '%s': %s", path,
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strerror_r(errno, sbuf, sizeof(sbuf)));
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}
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}
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static void exec_man_man(const char *path, const char *page)
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{
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char sbuf[STRERR_BUFSIZE];
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if (!path)
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path = "man";
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execlp(path, "man", page, NULL);
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warning("failed to exec '%s': %s", path,
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strerror_r(errno, sbuf, sizeof(sbuf)));
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}
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static void exec_man_cmd(const char *cmd, const char *page)
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{
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char sbuf[STRERR_BUFSIZE];
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char *shell_cmd;
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if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) {
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execl("/bin/sh", "sh", "-c", shell_cmd, NULL);
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free(shell_cmd);
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}
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warning("failed to exec '%s': %s", cmd,
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strerror_r(errno, sbuf, sizeof(sbuf)));
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}
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static void add_man_viewer(const char *name)
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{
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struct man_viewer_list **p = &man_viewer_list;
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size_t len = strlen(name);
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while (*p)
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p = &((*p)->next);
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*p = zalloc(sizeof(**p) + len + 1);
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strncpy((*p)->name, name, len);
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}
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static int supported_man_viewer(const char *name, size_t len)
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{
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return (!strncasecmp("man", name, len) ||
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!strncasecmp("woman", name, len) ||
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!strncasecmp("konqueror", name, len));
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}
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static void do_add_man_viewer_info(const char *name,
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size_t len,
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const char *value)
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{
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struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
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strncpy(new->name, name, len);
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new->info = strdup(value);
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new->next = man_viewer_info_list;
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man_viewer_info_list = new;
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}
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static int add_man_viewer_path(const char *name,
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size_t len,
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const char *value)
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{
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if (supported_man_viewer(name, len))
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do_add_man_viewer_info(name, len, value);
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else
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warning("'%s': path for unsupported man viewer.\n"
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"Please consider using 'man.<tool>.cmd' instead.",
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name);
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return 0;
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}
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static int add_man_viewer_cmd(const char *name,
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size_t len,
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const char *value)
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{
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if (supported_man_viewer(name, len))
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warning("'%s': cmd for supported man viewer.\n"
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"Please consider using 'man.<tool>.path' instead.",
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name);
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else
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do_add_man_viewer_info(name, len, value);
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return 0;
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}
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static int add_man_viewer_info(const char *var, const char *value)
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{
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const char *name = var + 4;
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const char *subkey = strrchr(name, '.');
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if (!subkey)
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return error("Config with no key for man viewer: %s", name);
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if (!strcmp(subkey, ".path")) {
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if (!value)
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return config_error_nonbool(var);
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return add_man_viewer_path(name, subkey - name, value);
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}
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if (!strcmp(subkey, ".cmd")) {
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if (!value)
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return config_error_nonbool(var);
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return add_man_viewer_cmd(name, subkey - name, value);
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}
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warning("'%s': unsupported man viewer sub key.", subkey);
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return 0;
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}
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static int perf_help_config(const char *var, const char *value, void *cb)
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{
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enum help_format *help_formatp = cb;
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if (!strcmp(var, "help.format")) {
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if (!value)
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return config_error_nonbool(var);
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*help_formatp = parse_help_format(value);
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if (*help_formatp == HELP_FORMAT_NONE)
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return -1;
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return 0;
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}
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if (!strcmp(var, "man.viewer")) {
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if (!value)
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return config_error_nonbool(var);
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add_man_viewer(value);
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return 0;
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}
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if (!prefixcmp(var, "man."))
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return add_man_viewer_info(var, value);
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return 0;
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}
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static struct cmdnames main_cmds, other_cmds;
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void list_common_cmds_help(void)
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{
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unsigned int i, longest = 0;
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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if (longest < strlen(common_cmds[i].name))
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longest = strlen(common_cmds[i].name);
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}
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puts(" The most commonly used perf commands are:");
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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printf(" %-*s ", longest, common_cmds[i].name);
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puts(common_cmds[i].help);
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}
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}
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static int is_perf_command(const char *s)
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{
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return is_in_cmdlist(&main_cmds, s) ||
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is_in_cmdlist(&other_cmds, s);
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}
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static const char *cmd_to_page(const char *perf_cmd)
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{
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char *s;
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if (!perf_cmd)
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return "perf";
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else if (!prefixcmp(perf_cmd, "perf"))
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return perf_cmd;
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return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
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}
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static void setup_man_path(void)
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{
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char *new_path;
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const char *old_path = getenv("MANPATH");
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/* We should always put ':' after our path. If there is no
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* old_path, the ':' at the end will let 'man' to try
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* system-wide paths after ours to find the manual page. If
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* there is old_path, we need ':' as delimiter. */
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if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) {
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setenv("MANPATH", new_path, 1);
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free(new_path);
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} else {
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error("Unable to setup man path");
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}
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}
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static void exec_viewer(const char *name, const char *page)
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{
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const char *info = get_man_viewer_info(name);
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if (!strcasecmp(name, "man"))
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exec_man_man(info, page);
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else if (!strcasecmp(name, "woman"))
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exec_woman_emacs(info, page);
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else if (!strcasecmp(name, "konqueror"))
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exec_man_konqueror(info, page);
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else if (info)
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exec_man_cmd(info, page);
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else
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warning("'%s': unknown man viewer.", name);
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}
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static int show_man_page(const char *perf_cmd)
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{
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struct man_viewer_list *viewer;
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const char *page = cmd_to_page(perf_cmd);
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const char *fallback = getenv("PERF_MAN_VIEWER");
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setup_man_path();
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for (viewer = man_viewer_list; viewer; viewer = viewer->next)
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exec_viewer(viewer->name, page); /* will return when unable */
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if (fallback)
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exec_viewer(fallback, page);
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exec_viewer("man", page);
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pr_err("no man viewer handled the request");
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return -1;
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}
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static int show_info_page(const char *perf_cmd)
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{
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const char *page = cmd_to_page(perf_cmd);
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setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
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execlp("info", "info", "perfman", page, NULL);
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return -1;
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}
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static int get_html_page_path(char **page_path, const char *page)
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{
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struct stat st;
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const char *html_path = system_path(PERF_HTML_PATH);
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/* Check that we have a perf documentation directory. */
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if (stat(mkpath("%s/perf.html", html_path), &st)
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|| !S_ISREG(st.st_mode)) {
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pr_err("'%s': not a documentation directory.", html_path);
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return -1;
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}
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return asprintf(page_path, "%s/%s.html", html_path, page);
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}
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/*
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* If open_html is not defined in a platform-specific way (see for
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* example compat/mingw.h), we use the script web--browse to display
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* HTML.
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*/
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#ifndef open_html
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static void open_html(const char *path)
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{
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execl_cmd("web--browse", "-c", "help.browser", path, NULL);
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}
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#endif
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static int show_html_page(const char *perf_cmd)
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{
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const char *page = cmd_to_page(perf_cmd);
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char *page_path; /* it leaks but we exec bellow */
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if (get_html_page_path(&page_path, page) < 0)
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return -1;
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open_html(page_path);
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return 0;
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}
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int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused)
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{
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bool show_all = false;
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enum help_format help_format = HELP_FORMAT_MAN;
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struct option builtin_help_options[] = {
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OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
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OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
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OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
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HELP_FORMAT_WEB),
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OPT_SET_UINT('i', "info", &help_format, "show info page",
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HELP_FORMAT_INFO),
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OPT_END(),
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};
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const char * const builtin_help_subcommands[] = {
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"buildid-cache", "buildid-list", "diff", "evlist", "help", "list",
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"record", "report", "bench", "stat", "timechart", "top", "annotate",
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"script", "sched", "kmem", "lock", "kvm", "test", "inject", "mem", "data",
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#ifdef HAVE_LIBELF_SUPPORT
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"probe",
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#endif
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#ifdef HAVE_LIBAUDIT_SUPPORT
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"trace",
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#endif
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NULL };
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const char *builtin_help_usage[] = {
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"perf help [--all] [--man|--web|--info] [command]",
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NULL
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};
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const char *alias;
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int rc = 0;
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load_command_list("perf-", &main_cmds, &other_cmds);
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perf_config(perf_help_config, &help_format);
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argc = parse_options_subcommand(argc, argv, builtin_help_options,
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builtin_help_subcommands, builtin_help_usage, 0);
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if (show_all) {
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printf("\n Usage: %s\n\n", perf_usage_string);
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list_commands("perf commands", &main_cmds, &other_cmds);
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printf(" %s\n\n", perf_more_info_string);
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return 0;
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}
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if (!argv[0]) {
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printf("\n usage: %s\n\n", perf_usage_string);
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list_common_cmds_help();
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printf("\n %s\n\n", perf_more_info_string);
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return 0;
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}
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alias = alias_lookup(argv[0]);
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if (alias && !is_perf_command(argv[0])) {
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printf("`perf %s' is aliased to `%s'\n", argv[0], alias);
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return 0;
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}
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switch (help_format) {
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case HELP_FORMAT_MAN:
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rc = show_man_page(argv[0]);
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break;
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case HELP_FORMAT_INFO:
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rc = show_info_page(argv[0]);
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break;
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case HELP_FORMAT_WEB:
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rc = show_html_page(argv[0]);
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break;
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case HELP_FORMAT_NONE:
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/* fall-through */
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default:
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rc = -1;
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break;
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}
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return rc;
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}
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