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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" |
148be2c1 | 9 | #include "util/exec_cmd.h" |
07800601 | 10 | #include "common-cmds.h" |
148be2c1 IM |
11 | #include "util/parse-options.h" |
12 | #include "util/run-command.h" | |
13 | #include "util/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 | ||
89 | strbuf_remove(&buffer, 0, strlen("emacsclient")); | |
90 | version = atoi(buffer.buf); | |
91 | ||
92 | if (version < 22) { | |
93 | fprintf(stderr, | |
94 | "emacsclient version '%d' too old (< 22).\n", | |
95 | version); | |
96 | strbuf_release(&buffer); | |
97 | return -1; | |
98 | } | |
99 | ||
100 | strbuf_release(&buffer); | |
101 | return 0; | |
102 | } | |
103 | ||
c1e53017 | 104 | static void exec_woman_emacs(const char *path, const char *page) |
07800601 | 105 | { |
ede395d2 MH |
106 | char sbuf[STRERR_BUFSIZE]; |
107 | ||
07800601 IM |
108 | if (!check_emacsclient_version()) { |
109 | /* This works only with emacsclient version >= 22. */ | |
110 | struct strbuf man_page = STRBUF_INIT; | |
111 | ||
112 | if (!path) | |
113 | path = "emacsclient"; | |
114 | strbuf_addf(&man_page, "(woman \"%s\")", page); | |
115 | execlp(path, "emacsclient", "-e", man_page.buf, NULL); | |
ede395d2 MH |
116 | warning("failed to exec '%s': %s", path, |
117 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
118 | } |
119 | } | |
120 | ||
c1e53017 | 121 | static void exec_man_konqueror(const char *path, const char *page) |
07800601 IM |
122 | { |
123 | const char *display = getenv("DISPLAY"); | |
ede395d2 | 124 | |
07800601 IM |
125 | if (display && *display) { |
126 | struct strbuf man_page = STRBUF_INIT; | |
127 | const char *filename = "kfmclient"; | |
ede395d2 | 128 | char sbuf[STRERR_BUFSIZE]; |
07800601 IM |
129 | |
130 | /* It's simpler to launch konqueror using kfmclient. */ | |
131 | if (path) { | |
132 | const char *file = strrchr(path, '/'); | |
133 | if (file && !strcmp(file + 1, "konqueror")) { | |
134 | char *new = strdup(path); | |
135 | char *dest = strrchr(new, '/'); | |
136 | ||
137 | /* strlen("konqueror") == strlen("kfmclient") */ | |
138 | strcpy(dest + 1, "kfmclient"); | |
139 | path = new; | |
140 | } | |
141 | if (file) | |
142 | filename = file; | |
143 | } else | |
144 | path = "kfmclient"; | |
145 | strbuf_addf(&man_page, "man:%s(1)", page); | |
146 | execlp(path, filename, "newTab", man_page.buf, NULL); | |
ede395d2 MH |
147 | warning("failed to exec '%s': %s", path, |
148 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
149 | } |
150 | } | |
151 | ||
c1e53017 | 152 | static void exec_man_man(const char *path, const char *page) |
07800601 | 153 | { |
ede395d2 MH |
154 | char sbuf[STRERR_BUFSIZE]; |
155 | ||
07800601 IM |
156 | if (!path) |
157 | path = "man"; | |
158 | execlp(path, "man", page, NULL); | |
ede395d2 MH |
159 | warning("failed to exec '%s': %s", path, |
160 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
161 | } |
162 | ||
163 | static void exec_man_cmd(const char *cmd, const char *page) | |
164 | { | |
165 | struct strbuf shell_cmd = STRBUF_INIT; | |
ede395d2 MH |
166 | char sbuf[STRERR_BUFSIZE]; |
167 | ||
07800601 IM |
168 | strbuf_addf(&shell_cmd, "%s %s", cmd, page); |
169 | execl("/bin/sh", "sh", "-c", shell_cmd.buf, NULL); | |
ede395d2 MH |
170 | warning("failed to exec '%s': %s", cmd, |
171 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
07800601 IM |
172 | } |
173 | ||
174 | static void add_man_viewer(const char *name) | |
175 | { | |
176 | struct man_viewer_list **p = &man_viewer_list; | |
177 | size_t len = strlen(name); | |
178 | ||
179 | while (*p) | |
180 | p = &((*p)->next); | |
36479484 | 181 | *p = zalloc(sizeof(**p) + len + 1); |
07800601 IM |
182 | strncpy((*p)->name, name, len); |
183 | } | |
184 | ||
185 | static int supported_man_viewer(const char *name, size_t len) | |
186 | { | |
187 | return (!strncasecmp("man", name, len) || | |
188 | !strncasecmp("woman", name, len) || | |
189 | !strncasecmp("konqueror", name, len)); | |
190 | } | |
191 | ||
192 | static void do_add_man_viewer_info(const char *name, | |
193 | size_t len, | |
194 | const char *value) | |
195 | { | |
36479484 | 196 | struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1); |
07800601 IM |
197 | |
198 | strncpy(new->name, name, len); | |
199 | new->info = strdup(value); | |
200 | new->next = man_viewer_info_list; | |
201 | man_viewer_info_list = new; | |
202 | } | |
203 | ||
204 | static int add_man_viewer_path(const char *name, | |
205 | size_t len, | |
206 | const char *value) | |
207 | { | |
208 | if (supported_man_viewer(name, len)) | |
209 | do_add_man_viewer_info(name, len, value); | |
210 | else | |
211 | warning("'%s': path for unsupported man viewer.\n" | |
212 | "Please consider using 'man.<tool>.cmd' instead.", | |
213 | name); | |
214 | ||
215 | return 0; | |
216 | } | |
217 | ||
218 | static int add_man_viewer_cmd(const char *name, | |
219 | size_t len, | |
220 | const char *value) | |
221 | { | |
222 | if (supported_man_viewer(name, len)) | |
223 | warning("'%s': cmd for supported man viewer.\n" | |
224 | "Please consider using 'man.<tool>.path' instead.", | |
225 | name); | |
226 | else | |
227 | do_add_man_viewer_info(name, len, value); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int add_man_viewer_info(const char *var, const char *value) | |
233 | { | |
234 | const char *name = var + 4; | |
235 | const char *subkey = strrchr(name, '.'); | |
236 | ||
237 | if (!subkey) | |
238 | return error("Config with no key for man viewer: %s", name); | |
239 | ||
240 | if (!strcmp(subkey, ".path")) { | |
241 | if (!value) | |
242 | return config_error_nonbool(var); | |
243 | return add_man_viewer_path(name, subkey - name, value); | |
244 | } | |
245 | if (!strcmp(subkey, ".cmd")) { | |
246 | if (!value) | |
247 | return config_error_nonbool(var); | |
248 | return add_man_viewer_cmd(name, subkey - name, value); | |
249 | } | |
250 | ||
251 | warning("'%s': unsupported man viewer sub key.", subkey); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | static int perf_help_config(const char *var, const char *value, void *cb) | |
256 | { | |
2bae1d1b ACM |
257 | enum help_format *help_formatp = cb; |
258 | ||
07800601 IM |
259 | if (!strcmp(var, "help.format")) { |
260 | if (!value) | |
261 | return config_error_nonbool(var); | |
2bae1d1b ACM |
262 | *help_formatp = parse_help_format(value); |
263 | if (*help_formatp == HELP_FORMAT_NONE) | |
cc584821 | 264 | return -1; |
07800601 IM |
265 | return 0; |
266 | } | |
267 | if (!strcmp(var, "man.viewer")) { | |
268 | if (!value) | |
269 | return config_error_nonbool(var); | |
270 | add_man_viewer(value); | |
271 | return 0; | |
272 | } | |
273 | if (!prefixcmp(var, "man.")) | |
274 | return add_man_viewer_info(var, value); | |
275 | ||
276 | return perf_default_config(var, value, cb); | |
277 | } | |
278 | ||
279 | static struct cmdnames main_cmds, other_cmds; | |
280 | ||
281 | void list_common_cmds_help(void) | |
282 | { | |
f37a291c | 283 | unsigned int i, longest = 0; |
07800601 IM |
284 | |
285 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { | |
286 | if (longest < strlen(common_cmds[i].name)) | |
287 | longest = strlen(common_cmds[i].name); | |
288 | } | |
289 | ||
502fc5c7 | 290 | puts(" The most commonly used perf commands are:"); |
07800601 | 291 | for (i = 0; i < ARRAY_SIZE(common_cmds); i++) { |
3912f2ab | 292 | printf(" %-*s ", longest, common_cmds[i].name); |
07800601 IM |
293 | puts(common_cmds[i].help); |
294 | } | |
295 | } | |
296 | ||
297 | static int is_perf_command(const char *s) | |
298 | { | |
299 | return is_in_cmdlist(&main_cmds, s) || | |
300 | is_in_cmdlist(&other_cmds, s); | |
301 | } | |
302 | ||
303 | static const char *prepend(const char *prefix, const char *cmd) | |
304 | { | |
305 | size_t pre_len = strlen(prefix); | |
306 | size_t cmd_len = strlen(cmd); | |
307 | char *p = malloc(pre_len + cmd_len + 1); | |
308 | memcpy(p, prefix, pre_len); | |
309 | strcpy(p + pre_len, cmd); | |
310 | return p; | |
311 | } | |
312 | ||
313 | static const char *cmd_to_page(const char *perf_cmd) | |
314 | { | |
315 | if (!perf_cmd) | |
316 | return "perf"; | |
317 | else if (!prefixcmp(perf_cmd, "perf")) | |
318 | return perf_cmd; | |
07800601 | 319 | else |
c1c2365a | 320 | return prepend("perf-", perf_cmd); |
07800601 IM |
321 | } |
322 | ||
323 | static void setup_man_path(void) | |
324 | { | |
325 | struct strbuf new_path = STRBUF_INIT; | |
326 | const char *old_path = getenv("MANPATH"); | |
327 | ||
328 | /* We should always put ':' after our path. If there is no | |
329 | * old_path, the ':' at the end will let 'man' to try | |
330 | * system-wide paths after ours to find the manual page. If | |
331 | * there is old_path, we need ':' as delimiter. */ | |
332 | strbuf_addstr(&new_path, system_path(PERF_MAN_PATH)); | |
333 | strbuf_addch(&new_path, ':'); | |
334 | if (old_path) | |
335 | strbuf_addstr(&new_path, old_path); | |
336 | ||
337 | setenv("MANPATH", new_path.buf, 1); | |
338 | ||
339 | strbuf_release(&new_path); | |
340 | } | |
341 | ||
342 | static void exec_viewer(const char *name, const char *page) | |
343 | { | |
344 | const char *info = get_man_viewer_info(name); | |
345 | ||
346 | if (!strcasecmp(name, "man")) | |
347 | exec_man_man(info, page); | |
348 | else if (!strcasecmp(name, "woman")) | |
349 | exec_woman_emacs(info, page); | |
350 | else if (!strcasecmp(name, "konqueror")) | |
351 | exec_man_konqueror(info, page); | |
352 | else if (info) | |
353 | exec_man_cmd(info, page); | |
354 | else | |
355 | warning("'%s': unknown man viewer.", name); | |
356 | } | |
357 | ||
cc584821 | 358 | static int show_man_page(const char *perf_cmd) |
07800601 IM |
359 | { |
360 | struct man_viewer_list *viewer; | |
361 | const char *page = cmd_to_page(perf_cmd); | |
362 | const char *fallback = getenv("PERF_MAN_VIEWER"); | |
363 | ||
364 | setup_man_path(); | |
365 | for (viewer = man_viewer_list; viewer; viewer = viewer->next) | |
07800601 | 366 | exec_viewer(viewer->name, page); /* will return when unable */ |
c1e53017 | 367 | |
07800601 IM |
368 | if (fallback) |
369 | exec_viewer(fallback, page); | |
370 | exec_viewer("man", page); | |
cc584821 DA |
371 | |
372 | pr_err("no man viewer handled the request"); | |
373 | return -1; | |
07800601 IM |
374 | } |
375 | ||
cc584821 | 376 | static int show_info_page(const char *perf_cmd) |
07800601 IM |
377 | { |
378 | const char *page = cmd_to_page(perf_cmd); | |
379 | setenv("INFOPATH", system_path(PERF_INFO_PATH), 1); | |
380 | execlp("info", "info", "perfman", page, NULL); | |
cc584821 | 381 | return -1; |
07800601 IM |
382 | } |
383 | ||
cc584821 | 384 | static int get_html_page_path(struct strbuf *page_path, const char *page) |
07800601 IM |
385 | { |
386 | struct stat st; | |
387 | const char *html_path = system_path(PERF_HTML_PATH); | |
388 | ||
389 | /* Check that we have a perf documentation directory. */ | |
390 | if (stat(mkpath("%s/perf.html", html_path), &st) | |
cc584821 DA |
391 | || !S_ISREG(st.st_mode)) { |
392 | pr_err("'%s': not a documentation directory.", html_path); | |
393 | return -1; | |
394 | } | |
07800601 IM |
395 | |
396 | strbuf_init(page_path, 0); | |
397 | strbuf_addf(page_path, "%s/%s.html", html_path, page); | |
cc584821 DA |
398 | |
399 | return 0; | |
07800601 IM |
400 | } |
401 | ||
402 | /* | |
403 | * If open_html is not defined in a platform-specific way (see for | |
404 | * example compat/mingw.h), we use the script web--browse to display | |
405 | * HTML. | |
406 | */ | |
407 | #ifndef open_html | |
16f762a2 | 408 | static void open_html(const char *path) |
07800601 IM |
409 | { |
410 | execl_perf_cmd("web--browse", "-c", "help.browser", path, NULL); | |
411 | } | |
412 | #endif | |
413 | ||
cc584821 | 414 | static int show_html_page(const char *perf_cmd) |
07800601 IM |
415 | { |
416 | const char *page = cmd_to_page(perf_cmd); | |
417 | struct strbuf page_path; /* it leaks but we exec bellow */ | |
418 | ||
cc584821 DA |
419 | if (get_html_page_path(&page_path, page) != 0) |
420 | return -1; | |
07800601 IM |
421 | |
422 | open_html(page_path.buf); | |
cc584821 DA |
423 | |
424 | return 0; | |
07800601 IM |
425 | } |
426 | ||
1d037ca1 | 427 | int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused) |
07800601 | 428 | { |
2bae1d1b | 429 | bool show_all = false; |
670ab5d2 | 430 | enum help_format help_format = HELP_FORMAT_MAN; |
2bae1d1b ACM |
431 | struct option builtin_help_options[] = { |
432 | OPT_BOOLEAN('a', "all", &show_all, "print all available commands"), | |
433 | OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN), | |
434 | OPT_SET_UINT('w', "web", &help_format, "show manual in web browser", | |
435 | HELP_FORMAT_WEB), | |
436 | OPT_SET_UINT('i', "info", &help_format, "show info page", | |
437 | HELP_FORMAT_INFO), | |
438 | OPT_END(), | |
439 | }; | |
e24a1108 YS |
440 | const char * const builtin_help_subcommands[] = { |
441 | "buildid-cache", "buildid-list", "diff", "evlist", "help", "list", | |
442 | "record", "report", "bench", "stat", "timechart", "top", "annotate", | |
443 | "script", "sched", "kmem", "lock", "kvm", "test", "inject", "mem", "data", | |
444 | #ifdef HAVE_LIBELF_SUPPORT | |
445 | "probe", | |
446 | #endif | |
447 | #ifdef HAVE_LIBAUDIT_SUPPORT | |
448 | "trace", | |
449 | #endif | |
450 | NULL }; | |
451 | const char *builtin_help_usage[] = { | |
2bae1d1b ACM |
452 | "perf help [--all] [--man|--web|--info] [command]", |
453 | NULL | |
454 | }; | |
07800601 | 455 | const char *alias; |
cc584821 | 456 | int rc = 0; |
f37a291c | 457 | |
07800601 IM |
458 | load_command_list("perf-", &main_cmds, &other_cmds); |
459 | ||
2bae1d1b | 460 | perf_config(perf_help_config, &help_format); |
07800601 | 461 | |
e24a1108 YS |
462 | argc = parse_options_subcommand(argc, argv, builtin_help_options, |
463 | builtin_help_subcommands, builtin_help_usage, 0); | |
07800601 IM |
464 | |
465 | if (show_all) { | |
3a134ae9 | 466 | printf("\n Usage: %s\n\n", perf_usage_string); |
07800601 | 467 | list_commands("perf commands", &main_cmds, &other_cmds); |
502fc5c7 | 468 | printf(" %s\n\n", perf_more_info_string); |
07800601 IM |
469 | return 0; |
470 | } | |
471 | ||
472 | if (!argv[0]) { | |
502fc5c7 | 473 | printf("\n usage: %s\n\n", perf_usage_string); |
07800601 | 474 | list_common_cmds_help(); |
502fc5c7 | 475 | printf("\n %s\n\n", perf_more_info_string); |
07800601 IM |
476 | return 0; |
477 | } | |
478 | ||
479 | alias = alias_lookup(argv[0]); | |
480 | if (alias && !is_perf_command(argv[0])) { | |
481 | printf("`perf %s' is aliased to `%s'\n", argv[0], alias); | |
482 | return 0; | |
483 | } | |
484 | ||
485 | switch (help_format) { | |
486 | case HELP_FORMAT_MAN: | |
cc584821 | 487 | rc = show_man_page(argv[0]); |
07800601 IM |
488 | break; |
489 | case HELP_FORMAT_INFO: | |
cc584821 | 490 | rc = show_info_page(argv[0]); |
07800601 IM |
491 | break; |
492 | case HELP_FORMAT_WEB: | |
cc584821 DA |
493 | rc = show_html_page(argv[0]); |
494 | break; | |
495 | case HELP_FORMAT_NONE: | |
496 | /* fall-through */ | |
83a0944f | 497 | default: |
cc584821 | 498 | rc = -1; |
07800601 IM |
499 | break; |
500 | } | |
501 | ||
cc584821 | 502 | return rc; |
07800601 | 503 | } |