Commit | Line | Data |
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07800601 IM |
1 | /* |
2 | * builtin-help.c | |
3 | * | |
4 | * Builtin help command | |
5 | */ | |
148be2c1 | 6 | #include "util/cache.h" |
07800601 | 7 | #include "builtin.h" |
148be2c1 | 8 | #include "util/exec_cmd.h" |
07800601 | 9 | #include "common-cmds.h" |
148be2c1 IM |
10 | #include "util/parse-options.h" |
11 | #include "util/run-command.h" | |
12 | #include "util/help.h" | |
07800601 IM |
13 | |
14 | static struct man_viewer_list { | |
15 | struct man_viewer_list *next; | |
16 | char name[FLEX_ARRAY]; | |
17 | } *man_viewer_list; | |
18 | ||
19 | static 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 | ||
25 | enum help_format { | |
26 | HELP_FORMAT_MAN, | |
27 | HELP_FORMAT_INFO, | |
28 | HELP_FORMAT_WEB, | |
29 | }; | |
30 | ||
31 | static int show_all = 0; | |
32 | static enum help_format help_format = HELP_FORMAT_MAN; | |
33 | static 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 | ||
43 | static const char * const builtin_help_usage[] = { | |
44 | "perf help [--all] [--man|--web|--info] [command]", | |
45 | NULL | |
46 | }; | |
47 | ||
48 | static 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 | ||
59 | static 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 | ||
71 | static 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 | ||
117 | static 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 | ||
131 | static 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 | ||
159 | static 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 | ||
167 | static 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 | ||
175 | static 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 | ||
186 | static 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 | ||
193 | static 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 | ||
205 | static 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 | ||
219 | static 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 | ||
233 | static 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 | ||
256 | static 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 | ||
276 | static struct cmdnames main_cmds, other_cmds; | |
277 | ||
278 | void 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 | ||
502fc5c7 | 287 | puts(" The most commonly used perf commands are:"); |
07800601 IM |
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 | ||
295 | static 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 | ||
301 | static 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 | ||
311 | static 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 | |
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 | ||
358 | static 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 | ||
375 | static 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 | ||
382 | static 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 | |
16f762a2 | 402 | static void open_html(const char *path) |
07800601 IM |
403 | { |
404 | execl_perf_cmd("web--browse", "-c", "help.browser", path, NULL); | |
405 | } | |
406 | #endif | |
407 | ||
408 | static 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 | ||
418 | int cmd_help(int argc, const char **argv, const char *prefix) | |
419 | { | |
07800601 IM |
420 | const char *alias; |
421 | load_command_list("perf-", &main_cmds, &other_cmds); | |
422 | ||
07800601 IM |
423 | perf_config(perf_help_config, NULL); |
424 | ||
425 | argc = parse_options(argc, argv, builtin_help_options, | |
426 | builtin_help_usage, 0); | |
427 | ||
428 | if (show_all) { | |
502fc5c7 | 429 | printf("\n usage: %s\n\n", perf_usage_string); |
07800601 | 430 | list_commands("perf commands", &main_cmds, &other_cmds); |
502fc5c7 | 431 | printf(" %s\n\n", perf_more_info_string); |
07800601 IM |
432 | return 0; |
433 | } | |
434 | ||
435 | if (!argv[0]) { | |
502fc5c7 | 436 | printf("\n usage: %s\n\n", perf_usage_string); |
07800601 | 437 | list_common_cmds_help(); |
502fc5c7 | 438 | printf("\n %s\n\n", perf_more_info_string); |
07800601 IM |
439 | return 0; |
440 | } | |
441 | ||
442 | alias = alias_lookup(argv[0]); | |
443 | if (alias && !is_perf_command(argv[0])) { | |
444 | printf("`perf %s' is aliased to `%s'\n", argv[0], alias); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | switch (help_format) { | |
449 | case HELP_FORMAT_MAN: | |
450 | show_man_page(argv[0]); | |
451 | break; | |
452 | case HELP_FORMAT_INFO: | |
453 | show_info_page(argv[0]); | |
454 | break; | |
455 | case HELP_FORMAT_WEB: | |
456 | show_html_page(argv[0]); | |
457 | break; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } |