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Commit | Line | Data |
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07800601 IM |
1 | /* |
2 | * builtin-help.c | |
3 | * | |
4 | * Builtin help command | |
5 | */ | |
f37a291c | 6 | #include "perf.h" |
148be2c1 | 7 | #include "util/cache.h" |
07800601 | 8 | #include "builtin.h" |
4b6ab94e | 9 | #include <subcmd/exec-cmd.h> |
07800601 | 10 | #include "common-cmds.h" |
4b6ab94e JP |
11 | #include <subcmd/parse-options.h> |
12 | #include <subcmd/run-command.h> | |
13 | #include <subcmd/help.h> | |
84f5d36f | 14 | #include "util/debug.h" |
07800601 IM |
15 | |
16 | static struct man_viewer_list { | |
17 | struct man_viewer_list *next; | |
18 | char name[FLEX_ARRAY]; | |
19 | } *man_viewer_list; | |
20 | ||
21 | static struct man_viewer_info_list { | |
22 | struct man_viewer_info_list *next; | |
23 | const char *info; | |
24 | char name[FLEX_ARRAY]; | |
25 | } *man_viewer_info_list; | |
26 | ||
27 | enum help_format { | |
cc584821 | 28 | HELP_FORMAT_NONE, |
07800601 IM |
29 | HELP_FORMAT_MAN, |
30 | HELP_FORMAT_INFO, | |
31 | HELP_FORMAT_WEB, | |
32 | }; | |
33 | ||
07800601 IM |
34 | static enum help_format parse_help_format(const char *format) |
35 | { | |
36 | if (!strcmp(format, "man")) | |
37 | return HELP_FORMAT_MAN; | |
38 | if (!strcmp(format, "info")) | |
39 | return HELP_FORMAT_INFO; | |
40 | if (!strcmp(format, "web") || !strcmp(format, "html")) | |
41 | return HELP_FORMAT_WEB; | |
cc584821 DA |
42 | |
43 | pr_err("unrecognized help format '%s'", format); | |
44 | return HELP_FORMAT_NONE; | |
07800601 IM |
45 | } |
46 | ||
47 | static const char *get_man_viewer_info(const char *name) | |
48 | { | |
49 | struct man_viewer_info_list *viewer; | |
50 | ||
c1e53017 | 51 | for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) { |
07800601 IM |
52 | if (!strcasecmp(name, viewer->name)) |
53 | return viewer->info; | |
54 | } | |
55 | return NULL; | |
56 | } | |
57 | ||
58 | static int check_emacsclient_version(void) | |
59 | { | |
60 | struct strbuf buffer = STRBUF_INIT; | |
61 | struct child_process ec_process; | |
62 | const char *argv_ec[] = { "emacsclient", "--version", NULL }; | |
63 | int version; | |
64 | ||
65 | /* emacsclient prints its version number on stderr */ | |
66 | memset(&ec_process, 0, sizeof(ec_process)); | |
67 | ec_process.argv = argv_ec; | |
68 | ec_process.err = -1; | |
69 | ec_process.stdout_to_stderr = 1; | |
70 | if (start_command(&ec_process)) { | |
71 | fprintf(stderr, "Failed to start emacsclient.\n"); | |
72 | return -1; | |
73 | } | |
74 | strbuf_read(&buffer, ec_process.err, 20); | |
75 | close(ec_process.err); | |
76 | ||
77 | /* | |
78 | * Don't bother checking return value, because "emacsclient --version" | |
79 | * seems to always exits with code 1. | |
80 | */ | |
81 | finish_command(&ec_process); | |
82 | ||
83 | if (prefixcmp(buffer.buf, "emacsclient")) { | |
84 | fprintf(stderr, "Failed to parse emacsclient version.\n"); | |
85 | strbuf_release(&buffer); | |
86 | return -1; | |
87 | } | |
88 | ||
d1130686 | 89 | version = atoi(buffer.buf + strlen("emacsclient")); |
07800601 IM |
90 | |
91 | if (version < 22) { | |
92 | fprintf(stderr, | |
93 | "emacsclient version '%d' too old (< 22).\n", | |
94 | version); | |
95 | strbuf_release(&buffer); | |
96 | return -1; | |
97 | } | |
98 | ||
99 | strbuf_release(&buffer); | |
100 | return 0; | |
101 | } | |
102 | ||
c1e53017 | 103 | static void exec_woman_emacs(const char *path, const char *page) |
07800601 | 104 | { |
ede395d2 MH |
105 | char sbuf[STRERR_BUFSIZE]; |
106 | ||
07800601 IM |
107 | if (!check_emacsclient_version()) { |
108 | /* This works only with emacsclient version >= 22. */ | |
a610f5cb | 109 | char *man_page; |
07800601 IM |
110 | |
111 | if (!path) | |
112 | path = "emacsclient"; | |
a610f5cb ACM |
113 | if (asprintf(&man_page, "(woman \"%s\")", page) > 0) { |
114 | execlp(path, "emacsclient", "-e", man_page, NULL); | |
115 | free(man_page); | |
116 | } | |
ede395d2 MH |
117 | warning("failed to exec '%s': %s", path, |
118 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
119 | } |
120 | } | |
121 | ||
c1e53017 | 122 | static void exec_man_konqueror(const char *path, const char *page) |
07800601 IM |
123 | { |
124 | const char *display = getenv("DISPLAY"); | |
ede395d2 | 125 | |
07800601 | 126 | if (display && *display) { |
a610f5cb | 127 | char *man_page; |
07800601 | 128 | const char *filename = "kfmclient"; |
ede395d2 | 129 | char sbuf[STRERR_BUFSIZE]; |
07800601 IM |
130 | |
131 | /* It's simpler to launch konqueror using kfmclient. */ | |
132 | if (path) { | |
133 | const char *file = strrchr(path, '/'); | |
134 | if (file && !strcmp(file + 1, "konqueror")) { | |
135 | char *new = strdup(path); | |
136 | char *dest = strrchr(new, '/'); | |
137 | ||
138 | /* strlen("konqueror") == strlen("kfmclient") */ | |
139 | strcpy(dest + 1, "kfmclient"); | |
140 | path = new; | |
141 | } | |
142 | if (file) | |
143 | filename = file; | |
144 | } else | |
145 | path = "kfmclient"; | |
a610f5cb ACM |
146 | if (asprintf(&man_page, "man:%s(1)", page) > 0) { |
147 | execlp(path, filename, "newTab", man_page, NULL); | |
148 | free(man_page); | |
149 | } | |
ede395d2 MH |
150 | warning("failed to exec '%s': %s", path, |
151 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
152 | } |
153 | } | |
154 | ||
c1e53017 | 155 | static void exec_man_man(const char *path, const char *page) |
07800601 | 156 | { |
ede395d2 MH |
157 | char sbuf[STRERR_BUFSIZE]; |
158 | ||
07800601 IM |
159 | if (!path) |
160 | path = "man"; | |
161 | execlp(path, "man", page, NULL); | |
ede395d2 MH |
162 | warning("failed to exec '%s': %s", path, |
163 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
164 | } |
165 | ||
166 | static void exec_man_cmd(const char *cmd, const char *page) | |
167 | { | |
ede395d2 | 168 | char sbuf[STRERR_BUFSIZE]; |
a610f5cb | 169 | char *shell_cmd; |
ede395d2 | 170 | |
a610f5cb ACM |
171 | if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) { |
172 | execl("/bin/sh", "sh", "-c", shell_cmd, NULL); | |
173 | free(shell_cmd); | |
174 | } | |
ede395d2 MH |
175 | warning("failed to exec '%s': %s", cmd, |
176 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
177 | } |
178 | ||
179 | static void add_man_viewer(const char *name) | |
180 | { | |
181 | struct man_viewer_list **p = &man_viewer_list; | |
182 | size_t len = strlen(name); | |
183 | ||
184 | while (*p) | |
185 | p = &((*p)->next); | |
36479484 | 186 | *p = zalloc(sizeof(**p) + len + 1); |
07800601 IM |
187 | strncpy((*p)->name, name, len); |
188 | } | |
189 | ||
190 | static int supported_man_viewer(const char *name, size_t len) | |
191 | { | |
192 | return (!strncasecmp("man", name, len) || | |
193 | !strncasecmp("woman", name, len) || | |
194 | !strncasecmp("konqueror", name, len)); | |
195 | } | |
196 | ||
197 | static void do_add_man_viewer_info(const char *name, | |
198 | size_t len, | |
199 | const char *value) | |
200 | { | |
36479484 | 201 | struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1); |
07800601 IM |
202 | |
203 | strncpy(new->name, name, len); | |
204 | new->info = strdup(value); | |
205 | new->next = man_viewer_info_list; | |
206 | man_viewer_info_list = new; | |
207 | } | |
208 | ||
209 | static int add_man_viewer_path(const char *name, | |
210 | size_t len, | |
211 | const char *value) | |
212 | { | |
213 | if (supported_man_viewer(name, len)) | |
214 | do_add_man_viewer_info(name, len, value); | |
215 | else | |
216 | warning("'%s': path for unsupported man viewer.\n" | |
217 | "Please consider using 'man.<tool>.cmd' instead.", | |
218 | name); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static int add_man_viewer_cmd(const char *name, | |
224 | size_t len, | |
225 | const char *value) | |
226 | { | |
227 | if (supported_man_viewer(name, len)) | |
228 | warning("'%s': cmd for supported man viewer.\n" | |
229 | "Please consider using 'man.<tool>.path' instead.", | |
230 | name); | |
231 | else | |
232 | do_add_man_viewer_info(name, len, value); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static int add_man_viewer_info(const char *var, const char *value) | |
238 | { | |
239 | const char *name = var + 4; | |
240 | const char *subkey = strrchr(name, '.'); | |
241 | ||
242 | if (!subkey) | |
243 | return error("Config with no key for man viewer: %s", name); | |
244 | ||
245 | if (!strcmp(subkey, ".path")) { | |
246 | if (!value) | |
247 | return config_error_nonbool(var); | |
248 | return add_man_viewer_path(name, subkey - name, value); | |
249 | } | |
250 | if (!strcmp(subkey, ".cmd")) { | |
251 | if (!value) | |
252 | return config_error_nonbool(var); | |
253 | return add_man_viewer_cmd(name, subkey - name, value); | |
254 | } | |
255 | ||
256 | warning("'%s': unsupported man viewer sub key.", subkey); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | static int perf_help_config(const char *var, const char *value, void *cb) | |
261 | { | |
2bae1d1b ACM |
262 | enum help_format *help_formatp = cb; |
263 | ||
07800601 IM |
264 | if (!strcmp(var, "help.format")) { |
265 | if (!value) | |
266 | return config_error_nonbool(var); | |
2bae1d1b ACM |
267 | *help_formatp = parse_help_format(value); |
268 | if (*help_formatp == HELP_FORMAT_NONE) | |
cc584821 | 269 | return -1; |
07800601 IM |
270 | return 0; |
271 | } | |
272 | if (!strcmp(var, "man.viewer")) { | |
273 | if (!value) | |
274 | return config_error_nonbool(var); | |
275 | add_man_viewer(value); | |
276 | return 0; | |
277 | } | |
278 | if (!prefixcmp(var, "man.")) | |
279 | return add_man_viewer_info(var, value); | |
280 | ||
b8cbb349 | 281 | return 0; |
07800601 IM |
282 | } |
283 | ||
284 | static struct cmdnames main_cmds, other_cmds; | |
285 | ||
286 | void list_common_cmds_help(void) | |
287 | { | |
f37a291c | 288 | unsigned int i, longest = 0; |
07800601 IM |
289 | |
290 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { | |
291 | if (longest < strlen(common_cmds[i].name)) | |
292 | longest = strlen(common_cmds[i].name); | |
293 | } | |
294 | ||
502fc5c7 | 295 | puts(" The most commonly used perf commands are:"); |
07800601 | 296 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { |
3912f2ab | 297 | printf(" %-*s ", longest, common_cmds[i].name); |
07800601 IM |
298 | puts(common_cmds[i].help); |
299 | } | |
300 | } | |
301 | ||
302 | static int is_perf_command(const char *s) | |
303 | { | |
304 | return is_in_cmdlist(&main_cmds, s) || | |
305 | is_in_cmdlist(&other_cmds, s); | |
306 | } | |
307 | ||
07800601 IM |
308 | static const char *cmd_to_page(const char *perf_cmd) |
309 | { | |
a610f5cb ACM |
310 | char *s; |
311 | ||
07800601 IM |
312 | if (!perf_cmd) |
313 | return "perf"; | |
314 | else if (!prefixcmp(perf_cmd, "perf")) | |
315 | return perf_cmd; | |
a610f5cb ACM |
316 | |
317 | return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s; | |
07800601 IM |
318 | } |
319 | ||
320 | static void setup_man_path(void) | |
321 | { | |
a610f5cb | 322 | char *new_path; |
07800601 IM |
323 | const char *old_path = getenv("MANPATH"); |
324 | ||
325 | /* We should always put ':' after our path. If there is no | |
326 | * old_path, the ':' at the end will let 'man' to try | |
327 | * system-wide paths after ours to find the manual page. If | |
328 | * there is old_path, we need ':' as delimiter. */ | |
a610f5cb ACM |
329 | if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) { |
330 | setenv("MANPATH", new_path, 1); | |
331 | free(new_path); | |
332 | } else { | |
333 | error("Unable to setup man path"); | |
334 | } | |
07800601 IM |
335 | } |
336 | ||
337 | static void exec_viewer(const char *name, const char *page) | |
338 | { | |
339 | const char *info = get_man_viewer_info(name); | |
340 | ||
341 | if (!strcasecmp(name, "man")) | |
342 | exec_man_man(info, page); | |
343 | else if (!strcasecmp(name, "woman")) | |
344 | exec_woman_emacs(info, page); | |
345 | else if (!strcasecmp(name, "konqueror")) | |
346 | exec_man_konqueror(info, page); | |
347 | else if (info) | |
348 | exec_man_cmd(info, page); | |
349 | else | |
350 | warning("'%s': unknown man viewer.", name); | |
351 | } | |
352 | ||
cc584821 | 353 | static int show_man_page(const char *perf_cmd) |
07800601 IM |
354 | { |
355 | struct man_viewer_list *viewer; | |
356 | const char *page = cmd_to_page(perf_cmd); | |
357 | const char *fallback = getenv("PERF_MAN_VIEWER"); | |
358 | ||
359 | setup_man_path(); | |
360 | for (viewer = man_viewer_list; viewer; viewer = viewer->next) | |
07800601 | 361 | exec_viewer(viewer->name, page); /* will return when unable */ |
c1e53017 | 362 | |
07800601 IM |
363 | if (fallback) |
364 | exec_viewer(fallback, page); | |
365 | exec_viewer("man", page); | |
cc584821 DA |
366 | |
367 | pr_err("no man viewer handled the request"); | |
368 | return -1; | |
07800601 IM |
369 | } |
370 | ||
cc584821 | 371 | static int show_info_page(const char *perf_cmd) |
07800601 IM |
372 | { |
373 | const char *page = cmd_to_page(perf_cmd); | |
374 | setenv("INFOPATH", system_path(PERF_INFO_PATH), 1); | |
375 | execlp("info", "info", "perfman", page, NULL); | |
cc584821 | 376 | return -1; |
07800601 IM |
377 | } |
378 | ||
a610f5cb | 379 | static int get_html_page_path(char **page_path, const char *page) |
07800601 IM |
380 | { |
381 | struct stat st; | |
382 | const char *html_path = system_path(PERF_HTML_PATH); | |
383 | ||
384 | /* Check that we have a perf documentation directory. */ | |
385 | if (stat(mkpath("%s/perf.html", html_path), &st) | |
cc584821 DA |
386 | || !S_ISREG(st.st_mode)) { |
387 | pr_err("'%s': not a documentation directory.", html_path); | |
388 | return -1; | |
389 | } | |
07800601 | 390 | |
a610f5cb | 391 | return asprintf(page_path, "%s/%s.html", html_path, page); |
07800601 IM |
392 | } |
393 | ||
394 | /* | |
395 | * If open_html is not defined in a platform-specific way (see for | |
396 | * example compat/mingw.h), we use the script web--browse to display | |
397 | * HTML. | |
398 | */ | |
399 | #ifndef open_html | |
16f762a2 | 400 | static void open_html(const char *path) |
07800601 | 401 | { |
46113a54 | 402 | execl_cmd("web--browse", "-c", "help.browser", path, NULL); |
07800601 IM |
403 | } |
404 | #endif | |
405 | ||
cc584821 | 406 | static int show_html_page(const char *perf_cmd) |
07800601 IM |
407 | { |
408 | const char *page = cmd_to_page(perf_cmd); | |
a610f5cb | 409 | char *page_path; /* it leaks but we exec bellow */ |
07800601 | 410 | |
a610f5cb | 411 | if (get_html_page_path(&page_path, page) < 0) |
cc584821 | 412 | return -1; |
07800601 | 413 | |
a610f5cb | 414 | open_html(page_path); |
cc584821 DA |
415 | |
416 | return 0; | |
07800601 IM |
417 | } |
418 | ||
1d037ca1 | 419 | int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused) |
07800601 | 420 | { |
2bae1d1b | 421 | bool show_all = false; |
670ab5d2 | 422 | enum help_format help_format = HELP_FORMAT_MAN; |
2bae1d1b ACM |
423 | struct option builtin_help_options[] = { |
424 | OPT_BOOLEAN('a', "all", &show_all, "print all available commands"), | |
425 | OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN), | |
426 | OPT_SET_UINT('w', "web", &help_format, "show manual in web browser", | |
427 | HELP_FORMAT_WEB), | |
428 | OPT_SET_UINT('i', "info", &help_format, "show info page", | |
429 | HELP_FORMAT_INFO), | |
430 | OPT_END(), | |
431 | }; | |
e24a1108 YS |
432 | const char * const builtin_help_subcommands[] = { |
433 | "buildid-cache", "buildid-list", "diff", "evlist", "help", "list", | |
434 | "record", "report", "bench", "stat", "timechart", "top", "annotate", | |
435 | "script", "sched", "kmem", "lock", "kvm", "test", "inject", "mem", "data", | |
436 | #ifdef HAVE_LIBELF_SUPPORT | |
437 | "probe", | |
438 | #endif | |
439 | #ifdef HAVE_LIBAUDIT_SUPPORT | |
440 | "trace", | |
441 | #endif | |
442 | NULL }; | |
443 | const char *builtin_help_usage[] = { | |
2bae1d1b ACM |
444 | "perf help [--all] [--man|--web|--info] [command]", |
445 | NULL | |
446 | }; | |
07800601 | 447 | const char *alias; |
cc584821 | 448 | int rc = 0; |
f37a291c | 449 | |
07800601 IM |
450 | load_command_list("perf-", &main_cmds, &other_cmds); |
451 | ||
2bae1d1b | 452 | perf_config(perf_help_config, &help_format); |
07800601 | 453 | |
e24a1108 YS |
454 | argc = parse_options_subcommand(argc, argv, builtin_help_options, |
455 | builtin_help_subcommands, builtin_help_usage, 0); | |
07800601 IM |
456 | |
457 | if (show_all) { | |
3a134ae9 | 458 | printf("\n Usage: %s\n\n", perf_usage_string); |
07800601 | 459 | list_commands("perf commands", &main_cmds, &other_cmds); |
502fc5c7 | 460 | printf(" %s\n\n", perf_more_info_string); |
07800601 IM |
461 | return 0; |
462 | } | |
463 | ||
464 | if (!argv[0]) { | |
502fc5c7 | 465 | printf("\n usage: %s\n\n", perf_usage_string); |
07800601 | 466 | list_common_cmds_help(); |
502fc5c7 | 467 | printf("\n %s\n\n", perf_more_info_string); |
07800601 IM |
468 | return 0; |
469 | } | |
470 | ||
471 | alias = alias_lookup(argv[0]); | |
472 | if (alias && !is_perf_command(argv[0])) { | |
473 | printf("`perf %s' is aliased to `%s'\n", argv[0], alias); | |
474 | return 0; | |
475 | } | |
476 | ||
477 | switch (help_format) { | |
478 | case HELP_FORMAT_MAN: | |
cc584821 | 479 | rc = show_man_page(argv[0]); |
07800601 IM |
480 | break; |
481 | case HELP_FORMAT_INFO: | |
cc584821 | 482 | rc = show_info_page(argv[0]); |
07800601 IM |
483 | break; |
484 | case HELP_FORMAT_WEB: | |
cc584821 DA |
485 | rc = show_html_page(argv[0]); |
486 | break; | |
487 | case HELP_FORMAT_NONE: | |
488 | /* fall-through */ | |
83a0944f | 489 | default: |
cc584821 | 490 | rc = -1; |
07800601 IM |
491 | break; |
492 | } | |
493 | ||
cc584821 | 494 | return rc; |
07800601 | 495 | } |