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1/*
2 * builtin-help.c
3 *
4 * Builtin help command
5 */
6#include "perf.h"
7#include "util/cache.h"
8#include "builtin.h"
9#include "util/exec_cmd.h"
10#include "common-cmds.h"
11#include "util/parse-options.h"
12#include "util/run-command.h"
13#include "util/help.h"
14
15static struct man_viewer_list {
16 struct man_viewer_list *next;
17 char name[FLEX_ARRAY];
18} *man_viewer_list;
19
20static struct man_viewer_info_list {
21 struct man_viewer_info_list *next;
22 const char *info;
23 char name[FLEX_ARRAY];
24} *man_viewer_info_list;
25
26enum help_format {
27 HELP_FORMAT_NONE,
28 HELP_FORMAT_MAN,
29 HELP_FORMAT_INFO,
30 HELP_FORMAT_WEB,
31};
32
33static enum help_format parse_help_format(const char *format)
34{
35 if (!strcmp(format, "man"))
36 return HELP_FORMAT_MAN;
37 if (!strcmp(format, "info"))
38 return HELP_FORMAT_INFO;
39 if (!strcmp(format, "web") || !strcmp(format, "html"))
40 return HELP_FORMAT_WEB;
41
42 pr_err("unrecognized help format '%s'", format);
43 return HELP_FORMAT_NONE;
44}
45
46static const char *get_man_viewer_info(const char *name)
47{
48 struct man_viewer_info_list *viewer;
49
50 for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
51 if (!strcasecmp(name, viewer->name))
52 return viewer->info;
53 }
54 return NULL;
55}
56
57static int check_emacsclient_version(void)
58{
59 struct strbuf buffer = STRBUF_INIT;
60 struct child_process ec_process;
61 const char *argv_ec[] = { "emacsclient", "--version", NULL };
62 int version;
63
64 /* emacsclient prints its version number on stderr */
65 memset(&ec_process, 0, sizeof(ec_process));
66 ec_process.argv = argv_ec;
67 ec_process.err = -1;
68 ec_process.stdout_to_stderr = 1;
69 if (start_command(&ec_process)) {
70 fprintf(stderr, "Failed to start emacsclient.\n");
71 return -1;
72 }
73 strbuf_read(&buffer, ec_process.err, 20);
74 close(ec_process.err);
75
76 /*
77 * Don't bother checking return value, because "emacsclient --version"
78 * seems to always exits with code 1.
79 */
80 finish_command(&ec_process);
81
82 if (prefixcmp(buffer.buf, "emacsclient")) {
83 fprintf(stderr, "Failed to parse emacsclient version.\n");
84 strbuf_release(&buffer);
85 return -1;
86 }
87
88 strbuf_remove(&buffer, 0, strlen("emacsclient"));
89 version = atoi(buffer.buf);
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
103static void exec_woman_emacs(const char *path, const char *page)
104{
105 if (!check_emacsclient_version()) {
106 /* This works only with emacsclient version >= 22. */
107 struct strbuf man_page = STRBUF_INIT;
108
109 if (!path)
110 path = "emacsclient";
111 strbuf_addf(&man_page, "(woman \"%s\")", page);
112 execlp(path, "emacsclient", "-e", man_page.buf, NULL);
113 warning("failed to exec '%s': %s", path, strerror(errno));
114 }
115}
116
117static void exec_man_konqueror(const char *path, const char *page)
118{
119 const char *display = getenv("DISPLAY");
120 if (display && *display) {
121 struct strbuf man_page = STRBUF_INIT;
122 const char *filename = "kfmclient";
123
124 /* It's simpler to launch konqueror using kfmclient. */
125 if (path) {
126 const char *file = strrchr(path, '/');
127 if (file && !strcmp(file + 1, "konqueror")) {
128 char *new = strdup(path);
129 char *dest = strrchr(new, '/');
130
131 /* strlen("konqueror") == strlen("kfmclient") */
132 strcpy(dest + 1, "kfmclient");
133 path = new;
134 }
135 if (file)
136 filename = file;
137 } else
138 path = "kfmclient";
139 strbuf_addf(&man_page, "man:%s(1)", page);
140 execlp(path, filename, "newTab", man_page.buf, NULL);
141 warning("failed to exec '%s': %s", path, strerror(errno));
142 }
143}
144
145static void exec_man_man(const char *path, const char *page)
146{
147 if (!path)
148 path = "man";
149 execlp(path, "man", page, NULL);
150 warning("failed to exec '%s': %s", path, strerror(errno));
151}
152
153static void exec_man_cmd(const char *cmd, const char *page)
154{
155 struct strbuf shell_cmd = STRBUF_INIT;
156 strbuf_addf(&shell_cmd, "%s %s", cmd, page);
157 execl("/bin/sh", "sh", "-c", shell_cmd.buf, NULL);
158 warning("failed to exec '%s': %s", cmd, strerror(errno));
159}
160
161static void add_man_viewer(const char *name)
162{
163 struct man_viewer_list **p = &man_viewer_list;
164 size_t len = strlen(name);
165
166 while (*p)
167 p = &((*p)->next);
168 *p = zalloc(sizeof(**p) + len + 1);
169 strncpy((*p)->name, name, len);
170}
171
172static int supported_man_viewer(const char *name, size_t len)
173{
174 return (!strncasecmp("man", name, len) ||
175 !strncasecmp("woman", name, len) ||
176 !strncasecmp("konqueror", name, len));
177}
178
179static void do_add_man_viewer_info(const char *name,
180 size_t len,
181 const char *value)
182{
183 struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
184
185 strncpy(new->name, name, len);
186 new->info = strdup(value);
187 new->next = man_viewer_info_list;
188 man_viewer_info_list = new;
189}
190
191static int add_man_viewer_path(const char *name,
192 size_t len,
193 const char *value)
194{
195 if (supported_man_viewer(name, len))
196 do_add_man_viewer_info(name, len, value);
197 else
198 warning("'%s': path for unsupported man viewer.\n"
199 "Please consider using 'man.<tool>.cmd' instead.",
200 name);
201
202 return 0;
203}
204
205static int add_man_viewer_cmd(const char *name,
206 size_t len,
207 const char *value)
208{
209 if (supported_man_viewer(name, len))
210 warning("'%s': cmd for supported man viewer.\n"
211 "Please consider using 'man.<tool>.path' instead.",
212 name);
213 else
214 do_add_man_viewer_info(name, len, value);
215
216 return 0;
217}
218
219static int add_man_viewer_info(const char *var, const char *value)
220{
221 const char *name = var + 4;
222 const char *subkey = strrchr(name, '.');
223
224 if (!subkey)
225 return error("Config with no key for man viewer: %s", name);
226
227 if (!strcmp(subkey, ".path")) {
228 if (!value)
229 return config_error_nonbool(var);
230 return add_man_viewer_path(name, subkey - name, value);
231 }
232 if (!strcmp(subkey, ".cmd")) {
233 if (!value)
234 return config_error_nonbool(var);
235 return add_man_viewer_cmd(name, subkey - name, value);
236 }
237
238 warning("'%s': unsupported man viewer sub key.", subkey);
239 return 0;
240}
241
242static int perf_help_config(const char *var, const char *value, void *cb)
243{
244 enum help_format *help_formatp = cb;
245
246 if (!strcmp(var, "help.format")) {
247 if (!value)
248 return config_error_nonbool(var);
249 *help_formatp = parse_help_format(value);
250 if (*help_formatp == HELP_FORMAT_NONE)
251 return -1;
252 return 0;
253 }
254 if (!strcmp(var, "man.viewer")) {
255 if (!value)
256 return config_error_nonbool(var);
257 add_man_viewer(value);
258 return 0;
259 }
260 if (!prefixcmp(var, "man."))
261 return add_man_viewer_info(var, value);
262
263 return perf_default_config(var, value, cb);
264}
265
266static struct cmdnames main_cmds, other_cmds;
267
268void list_common_cmds_help(void)
269{
270 unsigned int i, longest = 0;
271
272 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
273 if (longest < strlen(common_cmds[i].name))
274 longest = strlen(common_cmds[i].name);
275 }
276
277 puts(" The most commonly used perf commands are:");
278 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
279 printf(" %-*s ", longest, common_cmds[i].name);
280 puts(common_cmds[i].help);
281 }
282}
283
284static int is_perf_command(const char *s)
285{
286 return is_in_cmdlist(&main_cmds, s) ||
287 is_in_cmdlist(&other_cmds, s);
288}
289
290static const char *prepend(const char *prefix, const char *cmd)
291{
292 size_t pre_len = strlen(prefix);
293 size_t cmd_len = strlen(cmd);
294 char *p = malloc(pre_len + cmd_len + 1);
295 memcpy(p, prefix, pre_len);
296 strcpy(p + pre_len, cmd);
297 return p;
298}
299
300static const char *cmd_to_page(const char *perf_cmd)
301{
302 if (!perf_cmd)
303 return "perf";
304 else if (!prefixcmp(perf_cmd, "perf"))
305 return perf_cmd;
306 else
307 return prepend("perf-", perf_cmd);
308}
309
310static void setup_man_path(void)
311{
312 struct strbuf new_path = STRBUF_INIT;
313 const char *old_path = getenv("MANPATH");
314
315 /* We should always put ':' after our path. If there is no
316 * old_path, the ':' at the end will let 'man' to try
317 * system-wide paths after ours to find the manual page. If
318 * there is old_path, we need ':' as delimiter. */
319 strbuf_addstr(&new_path, system_path(PERF_MAN_PATH));
320 strbuf_addch(&new_path, ':');
321 if (old_path)
322 strbuf_addstr(&new_path, old_path);
323
324 setenv("MANPATH", new_path.buf, 1);
325
326 strbuf_release(&new_path);
327}
328
329static void exec_viewer(const char *name, const char *page)
330{
331 const char *info = get_man_viewer_info(name);
332
333 if (!strcasecmp(name, "man"))
334 exec_man_man(info, page);
335 else if (!strcasecmp(name, "woman"))
336 exec_woman_emacs(info, page);
337 else if (!strcasecmp(name, "konqueror"))
338 exec_man_konqueror(info, page);
339 else if (info)
340 exec_man_cmd(info, page);
341 else
342 warning("'%s': unknown man viewer.", name);
343}
344
345static int show_man_page(const char *perf_cmd)
346{
347 struct man_viewer_list *viewer;
348 const char *page = cmd_to_page(perf_cmd);
349 const char *fallback = getenv("PERF_MAN_VIEWER");
350
351 setup_man_path();
352 for (viewer = man_viewer_list; viewer; viewer = viewer->next)
353 exec_viewer(viewer->name, page); /* will return when unable */
354
355 if (fallback)
356 exec_viewer(fallback, page);
357 exec_viewer("man", page);
358
359 pr_err("no man viewer handled the request");
360 return -1;
361}
362
363static int show_info_page(const char *perf_cmd)
364{
365 const char *page = cmd_to_page(perf_cmd);
366 setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
367 execlp("info", "info", "perfman", page, NULL);
368 return -1;
369}
370
371static int get_html_page_path(struct strbuf *page_path, const char *page)
372{
373 struct stat st;
374 const char *html_path = system_path(PERF_HTML_PATH);
375
376 /* Check that we have a perf documentation directory. */
377 if (stat(mkpath("%s/perf.html", html_path), &st)
378 || !S_ISREG(st.st_mode)) {
379 pr_err("'%s': not a documentation directory.", html_path);
380 return -1;
381 }
382
383 strbuf_init(page_path, 0);
384 strbuf_addf(page_path, "%s/%s.html", html_path, page);
385
386 return 0;
387}
388
389/*
390 * If open_html is not defined in a platform-specific way (see for
391 * example compat/mingw.h), we use the script web--browse to display
392 * HTML.
393 */
394#ifndef open_html
395static void open_html(const char *path)
396{
397 execl_perf_cmd("web--browse", "-c", "help.browser", path, NULL);
398}
399#endif
400
401static int show_html_page(const char *perf_cmd)
402{
403 const char *page = cmd_to_page(perf_cmd);
404 struct strbuf page_path; /* it leaks but we exec bellow */
405
406 if (get_html_page_path(&page_path, page) != 0)
407 return -1;
408
409 open_html(page_path.buf);
410
411 return 0;
412}
413
414int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused)
415{
416 bool show_all = false;
417 enum help_format help_format = HELP_FORMAT_MAN;
418 struct option builtin_help_options[] = {
419 OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
420 OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
421 OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
422 HELP_FORMAT_WEB),
423 OPT_SET_UINT('i', "info", &help_format, "show info page",
424 HELP_FORMAT_INFO),
425 OPT_END(),
426 };
427 const char * const builtin_help_usage[] = {
428 "perf help [--all] [--man|--web|--info] [command]",
429 NULL
430 };
431 const char *alias;
432 int rc = 0;
433
434 load_command_list("perf-", &main_cmds, &other_cmds);
435
436 perf_config(perf_help_config, &help_format);
437
438 argc = parse_options(argc, argv, builtin_help_options,
439 builtin_help_usage, 0);
440
441 if (show_all) {
442 printf("\n usage: %s\n\n", perf_usage_string);
443 list_commands("perf commands", &main_cmds, &other_cmds);
444 printf(" %s\n\n", perf_more_info_string);
445 return 0;
446 }
447
448 if (!argv[0]) {
449 printf("\n usage: %s\n\n", perf_usage_string);
450 list_common_cmds_help();
451 printf("\n %s\n\n", perf_more_info_string);
452 return 0;
453 }
454
455 alias = alias_lookup(argv[0]);
456 if (alias && !is_perf_command(argv[0])) {
457 printf("`perf %s' is aliased to `%s'\n", argv[0], alias);
458 return 0;
459 }
460
461 switch (help_format) {
462 case HELP_FORMAT_MAN:
463 rc = show_man_page(argv[0]);
464 break;
465 case HELP_FORMAT_INFO:
466 rc = show_info_page(argv[0]);
467 break;
468 case HELP_FORMAT_WEB:
469 rc = show_html_page(argv[0]);
470 break;
471 case HELP_FORMAT_NONE:
472 /* fall-through */
473 default:
474 rc = -1;
475 break;
476 }
477
478 return rc;
479}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * builtin-help.c
4 *
5 * Builtin help command
6 */
7#include "util/cache.h"
8#include "util/config.h"
9#include "util/strbuf.h"
10#include "builtin.h"
11#include <subcmd/exec-cmd.h>
12#include "common-cmds.h"
13#include <subcmd/parse-options.h>
14#include <subcmd/run-command.h>
15#include <subcmd/help.h>
16#include "util/debug.h"
17#include "util/util.h"
18#include <linux/kernel.h>
19#include <linux/string.h>
20#include <linux/zalloc.h>
21#include <errno.h>
22#include <limits.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/types.h>
27#include <sys/stat.h>
28#include <unistd.h>
29
30static struct man_viewer_list {
31 struct man_viewer_list *next;
32 char name[0];
33} *man_viewer_list;
34
35static struct man_viewer_info_list {
36 struct man_viewer_info_list *next;
37 const char *info;
38 char name[0];
39} *man_viewer_info_list;
40
41enum help_format {
42 HELP_FORMAT_NONE,
43 HELP_FORMAT_MAN,
44 HELP_FORMAT_INFO,
45 HELP_FORMAT_WEB,
46};
47
48static enum help_format parse_help_format(const char *format)
49{
50 if (!strcmp(format, "man"))
51 return HELP_FORMAT_MAN;
52 if (!strcmp(format, "info"))
53 return HELP_FORMAT_INFO;
54 if (!strcmp(format, "web") || !strcmp(format, "html"))
55 return HELP_FORMAT_WEB;
56
57 pr_err("unrecognized help format '%s'", format);
58 return HELP_FORMAT_NONE;
59}
60
61static const char *get_man_viewer_info(const char *name)
62{
63 struct man_viewer_info_list *viewer;
64
65 for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
66 if (!strcasecmp(name, viewer->name))
67 return viewer->info;
68 }
69 return NULL;
70}
71
72static int check_emacsclient_version(void)
73{
74 struct strbuf buffer = STRBUF_INIT;
75 struct child_process ec_process;
76 const char *argv_ec[] = { "emacsclient", "--version", NULL };
77 int version;
78 int ret = -1;
79
80 /* emacsclient prints its version number on stderr */
81 memset(&ec_process, 0, sizeof(ec_process));
82 ec_process.argv = argv_ec;
83 ec_process.err = -1;
84 ec_process.stdout_to_stderr = 1;
85 if (start_command(&ec_process)) {
86 fprintf(stderr, "Failed to start emacsclient.\n");
87 return -1;
88 }
89 if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
90 fprintf(stderr, "Failed to read emacsclient version\n");
91 goto out;
92 }
93 close(ec_process.err);
94
95 /*
96 * Don't bother checking return value, because "emacsclient --version"
97 * seems to always exits with code 1.
98 */
99 finish_command(&ec_process);
100
101 if (!strstarts(buffer.buf, "emacsclient")) {
102 fprintf(stderr, "Failed to parse emacsclient version.\n");
103 goto out;
104 }
105
106 version = atoi(buffer.buf + strlen("emacsclient"));
107
108 if (version < 22) {
109 fprintf(stderr,
110 "emacsclient version '%d' too old (< 22).\n",
111 version);
112 } else
113 ret = 0;
114out:
115 strbuf_release(&buffer);
116 return ret;
117}
118
119static void exec_failed(const char *cmd)
120{
121 char sbuf[STRERR_BUFSIZE];
122 pr_warning("failed to exec '%s': %s", cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
123}
124
125static void exec_woman_emacs(const char *path, const char *page)
126{
127 if (!check_emacsclient_version()) {
128 /* This works only with emacsclient version >= 22. */
129 char *man_page;
130
131 if (!path)
132 path = "emacsclient";
133 if (asprintf(&man_page, "(woman \"%s\")", page) > 0) {
134 execlp(path, "emacsclient", "-e", man_page, NULL);
135 free(man_page);
136 }
137 exec_failed(path);
138 }
139}
140
141static void exec_man_konqueror(const char *path, const char *page)
142{
143 const char *display = getenv("DISPLAY");
144
145 if (display && *display) {
146 char *man_page;
147 const char *filename = "kfmclient";
148
149 /* It's simpler to launch konqueror using kfmclient. */
150 if (path) {
151 const char *file = strrchr(path, '/');
152 if (file && !strcmp(file + 1, "konqueror")) {
153 char *new = strdup(path);
154 char *dest = strrchr(new, '/');
155
156 /* strlen("konqueror") == strlen("kfmclient") */
157 strcpy(dest + 1, "kfmclient");
158 path = new;
159 }
160 if (file)
161 filename = file;
162 } else
163 path = "kfmclient";
164 if (asprintf(&man_page, "man:%s(1)", page) > 0) {
165 execlp(path, filename, "newTab", man_page, NULL);
166 free(man_page);
167 }
168 exec_failed(path);
169 }
170}
171
172static void exec_man_man(const char *path, const char *page)
173{
174 if (!path)
175 path = "man";
176 execlp(path, "man", page, NULL);
177 exec_failed(path);
178}
179
180static void exec_man_cmd(const char *cmd, const char *page)
181{
182 char *shell_cmd;
183
184 if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) {
185 execl("/bin/sh", "sh", "-c", shell_cmd, NULL);
186 free(shell_cmd);
187 }
188 exec_failed(cmd);
189}
190
191static void add_man_viewer(const char *name)
192{
193 struct man_viewer_list **p = &man_viewer_list;
194 size_t len = strlen(name);
195
196 while (*p)
197 p = &((*p)->next);
198 *p = zalloc(sizeof(**p) + len + 1);
199 strcpy((*p)->name, name);
200}
201
202static int supported_man_viewer(const char *name, size_t len)
203{
204 return (!strncasecmp("man", name, len) ||
205 !strncasecmp("woman", name, len) ||
206 !strncasecmp("konqueror", name, len));
207}
208
209static void do_add_man_viewer_info(const char *name,
210 size_t len,
211 const char *value)
212{
213 struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
214
215 strncpy(new->name, name, len);
216 new->info = strdup(value);
217 new->next = man_viewer_info_list;
218 man_viewer_info_list = new;
219}
220
221static void unsupported_man_viewer(const char *name, const char *var)
222{
223 pr_warning("'%s': path for unsupported man viewer.\n"
224 "Please consider using 'man.<tool>.%s' instead.", name, var);
225}
226
227static int add_man_viewer_path(const char *name,
228 size_t len,
229 const char *value)
230{
231 if (supported_man_viewer(name, len))
232 do_add_man_viewer_info(name, len, value);
233 else
234 unsupported_man_viewer(name, "cmd");
235
236 return 0;
237}
238
239static int add_man_viewer_cmd(const char *name,
240 size_t len,
241 const char *value)
242{
243 if (supported_man_viewer(name, len))
244 unsupported_man_viewer(name, "path");
245 else
246 do_add_man_viewer_info(name, len, value);
247
248 return 0;
249}
250
251static int add_man_viewer_info(const char *var, const char *value)
252{
253 const char *name = var + 4;
254 const char *subkey = strrchr(name, '.');
255
256 if (!subkey) {
257 pr_err("Config with no key for man viewer: %s", name);
258 return -1;
259 }
260
261 if (!strcmp(subkey, ".path")) {
262 if (!value)
263 return config_error_nonbool(var);
264 return add_man_viewer_path(name, subkey - name, value);
265 }
266 if (!strcmp(subkey, ".cmd")) {
267 if (!value)
268 return config_error_nonbool(var);
269 return add_man_viewer_cmd(name, subkey - name, value);
270 }
271
272 pr_warning("'%s': unsupported man viewer sub key.", subkey);
273 return 0;
274}
275
276static int perf_help_config(const char *var, const char *value, void *cb)
277{
278 enum help_format *help_formatp = cb;
279
280 if (!strcmp(var, "help.format")) {
281 if (!value)
282 return config_error_nonbool(var);
283 *help_formatp = parse_help_format(value);
284 if (*help_formatp == HELP_FORMAT_NONE)
285 return -1;
286 return 0;
287 }
288 if (!strcmp(var, "man.viewer")) {
289 if (!value)
290 return config_error_nonbool(var);
291 add_man_viewer(value);
292 return 0;
293 }
294 if (strstarts(var, "man."))
295 return add_man_viewer_info(var, value);
296
297 return 0;
298}
299
300static struct cmdnames main_cmds, other_cmds;
301
302void list_common_cmds_help(void)
303{
304 unsigned int i, longest = 0;
305
306 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
307 if (longest < strlen(common_cmds[i].name))
308 longest = strlen(common_cmds[i].name);
309 }
310
311 puts(" The most commonly used perf commands are:");
312 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
313 printf(" %-*s ", longest, common_cmds[i].name);
314 puts(common_cmds[i].help);
315 }
316}
317
318static const char *cmd_to_page(const char *perf_cmd)
319{
320 char *s;
321
322 if (!perf_cmd)
323 return "perf";
324 else if (strstarts(perf_cmd, "perf"))
325 return perf_cmd;
326
327 return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
328}
329
330static void setup_man_path(void)
331{
332 char *new_path;
333 const char *old_path = getenv("MANPATH");
334
335 /* We should always put ':' after our path. If there is no
336 * old_path, the ':' at the end will let 'man' to try
337 * system-wide paths after ours to find the manual page. If
338 * there is old_path, we need ':' as delimiter. */
339 if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) {
340 setenv("MANPATH", new_path, 1);
341 free(new_path);
342 } else {
343 pr_err("Unable to setup man path");
344 }
345}
346
347static void exec_viewer(const char *name, const char *page)
348{
349 const char *info = get_man_viewer_info(name);
350
351 if (!strcasecmp(name, "man"))
352 exec_man_man(info, page);
353 else if (!strcasecmp(name, "woman"))
354 exec_woman_emacs(info, page);
355 else if (!strcasecmp(name, "konqueror"))
356 exec_man_konqueror(info, page);
357 else if (info)
358 exec_man_cmd(info, page);
359 else
360 pr_warning("'%s': unknown man viewer.", name);
361}
362
363static int show_man_page(const char *perf_cmd)
364{
365 struct man_viewer_list *viewer;
366 const char *page = cmd_to_page(perf_cmd);
367 const char *fallback = getenv("PERF_MAN_VIEWER");
368
369 setup_man_path();
370 for (viewer = man_viewer_list; viewer; viewer = viewer->next)
371 exec_viewer(viewer->name, page); /* will return when unable */
372
373 if (fallback)
374 exec_viewer(fallback, page);
375 exec_viewer("man", page);
376
377 pr_err("no man viewer handled the request");
378 return -1;
379}
380
381static int show_info_page(const char *perf_cmd)
382{
383 const char *page = cmd_to_page(perf_cmd);
384 setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
385 execlp("info", "info", "perfman", page, NULL);
386 return -1;
387}
388
389static int get_html_page_path(char **page_path, const char *page)
390{
391 struct stat st;
392 const char *html_path = system_path(PERF_HTML_PATH);
393 char path[PATH_MAX];
394
395 /* Check that we have a perf documentation directory. */
396 if (stat(mkpath(path, sizeof(path), "%s/perf.html", html_path), &st)
397 || !S_ISREG(st.st_mode)) {
398 pr_err("'%s': not a documentation directory.", html_path);
399 return -1;
400 }
401
402 return asprintf(page_path, "%s/%s.html", html_path, page);
403}
404
405/*
406 * If open_html is not defined in a platform-specific way (see for
407 * example compat/mingw.h), we use the script web--browse to display
408 * HTML.
409 */
410#ifndef open_html
411static void open_html(const char *path)
412{
413 execl_cmd("web--browse", "-c", "help.browser", path, NULL);
414}
415#endif
416
417static int show_html_page(const char *perf_cmd)
418{
419 const char *page = cmd_to_page(perf_cmd);
420 char *page_path; /* it leaks but we exec bellow */
421
422 if (get_html_page_path(&page_path, page) < 0)
423 return -1;
424
425 open_html(page_path);
426
427 return 0;
428}
429
430int cmd_help(int argc, const char **argv)
431{
432 bool show_all = false;
433 enum help_format help_format = HELP_FORMAT_MAN;
434 struct option builtin_help_options[] = {
435 OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
436 OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
437 OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
438 HELP_FORMAT_WEB),
439 OPT_SET_UINT('i', "info", &help_format, "show info page",
440 HELP_FORMAT_INFO),
441 OPT_END(),
442 };
443 const char * const builtin_help_subcommands[] = {
444 "buildid-cache", "buildid-list", "diff", "evlist", "help", "list",
445 "record", "report", "bench", "stat", "timechart", "top", "annotate",
446 "script", "sched", "kallsyms", "kmem", "lock", "kvm", "test", "inject", "mem", "data",
447#ifdef HAVE_LIBELF_SUPPORT
448 "probe",
449#endif
450#if defined(HAVE_LIBAUDIT_SUPPORT) || defined(HAVE_SYSCALL_TABLE_SUPPORT)
451 "trace",
452#endif
453 NULL };
454 const char *builtin_help_usage[] = {
455 "perf help [--all] [--man|--web|--info] [command]",
456 NULL
457 };
458 int rc;
459
460 load_command_list("perf-", &main_cmds, &other_cmds);
461
462 rc = perf_config(perf_help_config, &help_format);
463 if (rc)
464 return rc;
465
466 argc = parse_options_subcommand(argc, argv, builtin_help_options,
467 builtin_help_subcommands, builtin_help_usage, 0);
468
469 if (show_all) {
470 printf("\n Usage: %s\n\n", perf_usage_string);
471 list_commands("perf commands", &main_cmds, &other_cmds);
472 printf(" %s\n\n", perf_more_info_string);
473 return 0;
474 }
475
476 if (!argv[0]) {
477 printf("\n usage: %s\n\n", perf_usage_string);
478 list_common_cmds_help();
479 printf("\n %s\n\n", perf_more_info_string);
480 return 0;
481 }
482
483 switch (help_format) {
484 case HELP_FORMAT_MAN:
485 rc = show_man_page(argv[0]);
486 break;
487 case HELP_FORMAT_INFO:
488 rc = show_info_page(argv[0]);
489 break;
490 case HELP_FORMAT_WEB:
491 rc = show_html_page(argv[0]);
492 break;
493 case HELP_FORMAT_NONE:
494 /* fall-through */
495 default:
496 rc = -1;
497 break;
498 }
499
500 return rc;
501}