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-rw-r--r--Documentation/perf_counter/builtin-help.c463
1 files changed, 463 insertions, 0 deletions
diff --git a/Documentation/perf_counter/builtin-help.c b/Documentation/perf_counter/builtin-help.c
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1/*
2 * builtin-help.c
3 *
4 * Builtin help command
5 */
6#include "cache.h"
7#include "builtin.h"
8#include "exec_cmd.h"
9#include "common-cmds.h"
10#include "parse-options.h"
11#include "run-command.h"
12#include "help.h"
13
14static struct man_viewer_list {
15 struct man_viewer_list *next;
16 char name[FLEX_ARRAY];
17} *man_viewer_list;
18
19static struct man_viewer_info_list {
20 struct man_viewer_info_list *next;
21 const char *info;
22 char name[FLEX_ARRAY];
23} *man_viewer_info_list;
24
25enum help_format {
26 HELP_FORMAT_MAN,
27 HELP_FORMAT_INFO,
28 HELP_FORMAT_WEB,
29};
30
31static int show_all = 0;
32static enum help_format help_format = HELP_FORMAT_MAN;
33static struct option builtin_help_options[] = {
34 OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
35 OPT_SET_INT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
36 OPT_SET_INT('w', "web", &help_format, "show manual in web browser",
37 HELP_FORMAT_WEB),
38 OPT_SET_INT('i', "info", &help_format, "show info page",
39 HELP_FORMAT_INFO),
40 OPT_END(),
41};
42
43static const char * const builtin_help_usage[] = {
44 "perf help [--all] [--man|--web|--info] [command]",
45 NULL
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 die("unrecognized help format '%s'", format);
57}
58
59static const char *get_man_viewer_info(const char *name)
60{
61 struct man_viewer_info_list *viewer;
62
63 for (viewer = man_viewer_info_list; viewer; viewer = viewer->next)
64 {
65 if (!strcasecmp(name, viewer->name))
66 return viewer->info;
67 }
68 return NULL;
69}
70
71static int check_emacsclient_version(void)
72{
73 struct strbuf buffer = STRBUF_INIT;
74 struct child_process ec_process;
75 const char *argv_ec[] = { "emacsclient", "--version", NULL };
76 int version;
77
78 /* emacsclient prints its version number on stderr */
79 memset(&ec_process, 0, sizeof(ec_process));
80 ec_process.argv = argv_ec;
81 ec_process.err = -1;
82 ec_process.stdout_to_stderr = 1;
83 if (start_command(&ec_process)) {
84 fprintf(stderr, "Failed to start emacsclient.\n");
85 return -1;
86 }
87 strbuf_read(&buffer, ec_process.err, 20);
88 close(ec_process.err);
89
90 /*
91 * Don't bother checking return value, because "emacsclient --version"
92 * seems to always exits with code 1.
93 */
94 finish_command(&ec_process);
95
96 if (prefixcmp(buffer.buf, "emacsclient")) {
97 fprintf(stderr, "Failed to parse emacsclient version.\n");
98 strbuf_release(&buffer);
99 return -1;
100 }
101
102 strbuf_remove(&buffer, 0, strlen("emacsclient"));
103 version = atoi(buffer.buf);
104
105 if (version < 22) {
106 fprintf(stderr,
107 "emacsclient version '%d' too old (< 22).\n",
108 version);
109 strbuf_release(&buffer);
110 return -1;
111 }
112
113 strbuf_release(&buffer);
114 return 0;
115}
116
117static void exec_woman_emacs(const char* path, const char *page)
118{
119 if (!check_emacsclient_version()) {
120 /* This works only with emacsclient version >= 22. */
121 struct strbuf man_page = STRBUF_INIT;
122
123 if (!path)
124 path = "emacsclient";
125 strbuf_addf(&man_page, "(woman \"%s\")", page);
126 execlp(path, "emacsclient", "-e", man_page.buf, NULL);
127 warning("failed to exec '%s': %s", path, strerror(errno));
128 }
129}
130
131static void exec_man_konqueror(const char* path, const char *page)
132{
133 const char *display = getenv("DISPLAY");
134 if (display && *display) {
135 struct strbuf man_page = STRBUF_INIT;
136 const char *filename = "kfmclient";
137
138 /* It's simpler to launch konqueror using kfmclient. */
139 if (path) {
140 const char *file = strrchr(path, '/');
141 if (file && !strcmp(file + 1, "konqueror")) {
142 char *new = strdup(path);
143 char *dest = strrchr(new, '/');
144
145 /* strlen("konqueror") == strlen("kfmclient") */
146 strcpy(dest + 1, "kfmclient");
147 path = new;
148 }
149 if (file)
150 filename = file;
151 } else
152 path = "kfmclient";
153 strbuf_addf(&man_page, "man:%s(1)", page);
154 execlp(path, filename, "newTab", man_page.buf, NULL);
155 warning("failed to exec '%s': %s", path, strerror(errno));
156 }
157}
158
159static void exec_man_man(const char* path, const char *page)
160{
161 if (!path)
162 path = "man";
163 execlp(path, "man", page, NULL);
164 warning("failed to exec '%s': %s", path, strerror(errno));
165}
166
167static void exec_man_cmd(const char *cmd, const char *page)
168{
169 struct strbuf shell_cmd = STRBUF_INIT;
170 strbuf_addf(&shell_cmd, "%s %s", cmd, page);
171 execl("/bin/sh", "sh", "-c", shell_cmd.buf, NULL);
172 warning("failed to exec '%s': %s", cmd, strerror(errno));
173}
174
175static void add_man_viewer(const char *name)
176{
177 struct man_viewer_list **p = &man_viewer_list;
178 size_t len = strlen(name);
179
180 while (*p)
181 p = &((*p)->next);
182 *p = calloc(1, (sizeof(**p) + len + 1));
183 strncpy((*p)->name, name, len);
184}
185
186static int supported_man_viewer(const char *name, size_t len)
187{
188 return (!strncasecmp("man", name, len) ||
189 !strncasecmp("woman", name, len) ||
190 !strncasecmp("konqueror", name, len));
191}
192
193static void do_add_man_viewer_info(const char *name,
194 size_t len,
195 const char *value)
196{
197 struct man_viewer_info_list *new = calloc(1, sizeof(*new) + len + 1);
198
199 strncpy(new->name, name, len);
200 new->info = strdup(value);
201 new->next = man_viewer_info_list;
202 man_viewer_info_list = new;
203}
204
205static int add_man_viewer_path(const char *name,
206 size_t len,
207 const char *value)
208{
209 if (supported_man_viewer(name, len))
210 do_add_man_viewer_info(name, len, value);
211 else
212 warning("'%s': path for unsupported man viewer.\n"
213 "Please consider using 'man.<tool>.cmd' instead.",
214 name);
215
216 return 0;
217}
218
219static int add_man_viewer_cmd(const char *name,
220 size_t len,
221 const char *value)
222{
223 if (supported_man_viewer(name, len))
224 warning("'%s': cmd for supported man viewer.\n"
225 "Please consider using 'man.<tool>.path' instead.",
226 name);
227 else
228 do_add_man_viewer_info(name, len, value);
229
230 return 0;
231}
232
233static int add_man_viewer_info(const char *var, const char *value)
234{
235 const char *name = var + 4;
236 const char *subkey = strrchr(name, '.');
237
238 if (!subkey)
239 return error("Config with no key for man viewer: %s", name);
240
241 if (!strcmp(subkey, ".path")) {
242 if (!value)
243 return config_error_nonbool(var);
244 return add_man_viewer_path(name, subkey - name, value);
245 }
246 if (!strcmp(subkey, ".cmd")) {
247 if (!value)
248 return config_error_nonbool(var);
249 return add_man_viewer_cmd(name, subkey - name, value);
250 }
251
252 warning("'%s': unsupported man viewer sub key.", subkey);
253 return 0;
254}
255
256static int perf_help_config(const char *var, const char *value, void *cb)
257{
258 if (!strcmp(var, "help.format")) {
259 if (!value)
260 return config_error_nonbool(var);
261 help_format = parse_help_format(value);
262 return 0;
263 }
264 if (!strcmp(var, "man.viewer")) {
265 if (!value)
266 return config_error_nonbool(var);
267 add_man_viewer(value);
268 return 0;
269 }
270 if (!prefixcmp(var, "man."))
271 return add_man_viewer_info(var, value);
272
273 return perf_default_config(var, value, cb);
274}
275
276static struct cmdnames main_cmds, other_cmds;
277
278void list_common_cmds_help(void)
279{
280 int i, longest = 0;
281
282 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
283 if (longest < strlen(common_cmds[i].name))
284 longest = strlen(common_cmds[i].name);
285 }
286
287 puts("The most commonly used perf commands are:");
288 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
289 printf(" %s ", common_cmds[i].name);
290 mput_char(' ', longest - strlen(common_cmds[i].name));
291 puts(common_cmds[i].help);
292 }
293}
294
295static int is_perf_command(const char *s)
296{
297 return is_in_cmdlist(&main_cmds, s) ||
298 is_in_cmdlist(&other_cmds, s);
299}
300
301static const char *prepend(const char *prefix, const char *cmd)
302{
303 size_t pre_len = strlen(prefix);
304 size_t cmd_len = strlen(cmd);
305 char *p = malloc(pre_len + cmd_len + 1);
306 memcpy(p, prefix, pre_len);
307 strcpy(p + pre_len, cmd);
308 return p;
309}
310
311static const char *cmd_to_page(const char *perf_cmd)
312{
313 if (!perf_cmd)
314 return "perf";
315 else if (!prefixcmp(perf_cmd, "perf"))
316 return perf_cmd;
317 else if (is_perf_command(perf_cmd))
318 return prepend("perf-", perf_cmd);
319 else
320 return prepend("perf", perf_cmd);
321}
322
323static 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
342static 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
358static void show_man_page(const char *perf_cmd)
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)
366 {
367 exec_viewer(viewer->name, page); /* will return when unable */
368 }
369 if (fallback)
370 exec_viewer(fallback, page);
371 exec_viewer("man", page);
372 die("no man viewer handled the request");
373}
374
375static void show_info_page(const char *perf_cmd)
376{
377 const char *page = cmd_to_page(perf_cmd);
378 setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
379 execlp("info", "info", "perfman", page, NULL);
380}
381
382static void get_html_page_path(struct strbuf *page_path, const char *page)
383{
384 struct stat st;
385 const char *html_path = system_path(PERF_HTML_PATH);
386
387 /* Check that we have a perf documentation directory. */
388 if (stat(mkpath("%s/perf.html", html_path), &st)
389 || !S_ISREG(st.st_mode))
390 die("'%s': not a documentation directory.", html_path);
391
392 strbuf_init(page_path, 0);
393 strbuf_addf(page_path, "%s/%s.html", html_path, page);
394}
395
396/*
397 * If open_html is not defined in a platform-specific way (see for
398 * example compat/mingw.h), we use the script web--browse to display
399 * HTML.
400 */
401#ifndef open_html
402void open_html(const char *path)
403{
404 execl_perf_cmd("web--browse", "-c", "help.browser", path, NULL);
405}
406#endif
407
408static void show_html_page(const char *perf_cmd)
409{
410 const char *page = cmd_to_page(perf_cmd);
411 struct strbuf page_path; /* it leaks but we exec bellow */
412
413 get_html_page_path(&page_path, page);
414
415 open_html(page_path.buf);
416}
417
418int cmd_help(int argc, const char **argv, const char *prefix)
419{
420 int nonperf;
421 const char *alias;
422 load_command_list("perf-", &main_cmds, &other_cmds);
423
424 /* setup_perf_directory_gently(&nonperf); */
425 perf_config(perf_help_config, NULL);
426
427 argc = parse_options(argc, argv, builtin_help_options,
428 builtin_help_usage, 0);
429
430 if (show_all) {
431 printf("usage: %s\n\n", perf_usage_string);
432 list_commands("perf commands", &main_cmds, &other_cmds);
433 printf("%s\n", perf_more_info_string);
434 return 0;
435 }
436
437 if (!argv[0]) {
438 printf("usage: %s\n\n", perf_usage_string);
439 list_common_cmds_help();
440 printf("\n%s\n", perf_more_info_string);
441 return 0;
442 }
443
444 alias = alias_lookup(argv[0]);
445 if (alias && !is_perf_command(argv[0])) {
446 printf("`perf %s' is aliased to `%s'\n", argv[0], alias);
447 return 0;
448 }
449
450 switch (help_format) {
451 case HELP_FORMAT_MAN:
452 show_man_page(argv[0]);
453 break;
454 case HELP_FORMAT_INFO:
455 show_info_page(argv[0]);
456 break;
457 case HELP_FORMAT_WEB:
458 show_html_page(argv[0]);
459 break;
460 }
461
462 return 0;
463}