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1 | /* | |
2 | * Builtin help command | |
3 | */ | |
4 | #include "cache.h" | |
5 | #include "builtin.h" | |
6 | #include "exec_cmd.h" | |
7 | #include "parse-options.h" | |
8 | #include "run-command.h" | |
9 | #include "column.h" | |
10 | #include "help.h" | |
11 | ||
12 | #ifndef DEFAULT_HELP_FORMAT | |
13 | #define DEFAULT_HELP_FORMAT "man" | |
14 | #endif | |
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 { | |
28 | HELP_FORMAT_NONE, | |
29 | HELP_FORMAT_MAN, | |
30 | HELP_FORMAT_INFO, | |
31 | HELP_FORMAT_WEB | |
32 | }; | |
33 | ||
34 | static const char *html_path; | |
35 | ||
36 | static int show_all = 0; | |
37 | static int show_guides = 0; | |
38 | static unsigned int colopts; | |
39 | static enum help_format help_format = HELP_FORMAT_NONE; | |
40 | static struct option builtin_help_options[] = { | |
41 | OPT_BOOL('a', "all", &show_all, N_("print all available commands")), | |
42 | OPT_BOOL('g', "guides", &show_guides, N_("print list of useful guides")), | |
43 | OPT_SET_INT('m', "man", &help_format, N_("show man page"), HELP_FORMAT_MAN), | |
44 | OPT_SET_INT('w', "web", &help_format, N_("show manual in web browser"), | |
45 | HELP_FORMAT_WEB), | |
46 | OPT_SET_INT('i', "info", &help_format, N_("show info page"), | |
47 | HELP_FORMAT_INFO), | |
48 | OPT_END(), | |
49 | }; | |
50 | ||
51 | static const char * const builtin_help_usage[] = { | |
52 | N_("git help [--all] [--guides] [--man|--web|--info] [command]"), | |
53 | NULL | |
54 | }; | |
55 | ||
56 | static enum help_format parse_help_format(const char *format) | |
57 | { | |
58 | if (!strcmp(format, "man")) | |
59 | return HELP_FORMAT_MAN; | |
60 | if (!strcmp(format, "info")) | |
61 | return HELP_FORMAT_INFO; | |
62 | if (!strcmp(format, "web") || !strcmp(format, "html")) | |
63 | return HELP_FORMAT_WEB; | |
64 | die(_("unrecognized help format '%s'"), format); | |
65 | } | |
66 | ||
67 | static const char *get_man_viewer_info(const char *name) | |
68 | { | |
69 | struct man_viewer_info_list *viewer; | |
70 | ||
71 | for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) | |
72 | { | |
73 | if (!strcasecmp(name, viewer->name)) | |
74 | return viewer->info; | |
75 | } | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | static int check_emacsclient_version(void) | |
80 | { | |
81 | struct strbuf buffer = STRBUF_INIT; | |
82 | struct child_process ec_process; | |
83 | const char *argv_ec[] = { "emacsclient", "--version", NULL }; | |
84 | int version; | |
85 | ||
86 | /* emacsclient prints its version number on stderr */ | |
87 | memset(&ec_process, 0, sizeof(ec_process)); | |
88 | ec_process.argv = argv_ec; | |
89 | ec_process.err = -1; | |
90 | ec_process.stdout_to_stderr = 1; | |
91 | if (start_command(&ec_process)) | |
92 | return error(_("Failed to start emacsclient.")); | |
93 | ||
94 | strbuf_read(&buffer, ec_process.err, 20); | |
95 | close(ec_process.err); | |
96 | ||
97 | /* | |
98 | * Don't bother checking return value, because "emacsclient --version" | |
99 | * seems to always exits with code 1. | |
100 | */ | |
101 | finish_command(&ec_process); | |
102 | ||
103 | if (!starts_with(buffer.buf, "emacsclient")) { | |
104 | strbuf_release(&buffer); | |
105 | return error(_("Failed to parse emacsclient version.")); | |
106 | } | |
107 | ||
108 | strbuf_remove(&buffer, 0, strlen("emacsclient")); | |
109 | version = atoi(buffer.buf); | |
110 | ||
111 | if (version < 22) { | |
112 | strbuf_release(&buffer); | |
113 | return error(_("emacsclient version '%d' too old (< 22)."), | |
114 | version); | |
115 | } | |
116 | ||
117 | strbuf_release(&buffer); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static void exec_woman_emacs(const char *path, const char *page) | |
122 | { | |
123 | if (!check_emacsclient_version()) { | |
124 | /* This works only with emacsclient version >= 22. */ | |
125 | struct strbuf man_page = STRBUF_INIT; | |
126 | ||
127 | if (!path) | |
128 | path = "emacsclient"; | |
129 | strbuf_addf(&man_page, "(woman \"%s\")", page); | |
130 | execlp(path, "emacsclient", "-e", man_page.buf, (char *)NULL); | |
131 | warning(_("failed to exec '%s': %s"), path, strerror(errno)); | |
132 | } | |
133 | } | |
134 | ||
135 | static void exec_man_konqueror(const char *path, const char *page) | |
136 | { | |
137 | const char *display = getenv("DISPLAY"); | |
138 | if (display && *display) { | |
139 | struct strbuf man_page = STRBUF_INIT; | |
140 | const char *filename = "kfmclient"; | |
141 | ||
142 | /* It's simpler to launch konqueror using kfmclient. */ | |
143 | if (path) { | |
144 | const char *file = strrchr(path, '/'); | |
145 | if (file && !strcmp(file + 1, "konqueror")) { | |
146 | char *new = xstrdup(path); | |
147 | char *dest = strrchr(new, '/'); | |
148 | ||
149 | /* strlen("konqueror") == strlen("kfmclient") */ | |
150 | strcpy(dest + 1, "kfmclient"); | |
151 | path = new; | |
152 | } | |
153 | if (file) | |
154 | filename = file; | |
155 | } else | |
156 | path = "kfmclient"; | |
157 | strbuf_addf(&man_page, "man:%s(1)", page); | |
158 | execlp(path, filename, "newTab", man_page.buf, (char *)NULL); | |
159 | warning(_("failed to exec '%s': %s"), path, strerror(errno)); | |
160 | } | |
161 | } | |
162 | ||
163 | static void exec_man_man(const char *path, const char *page) | |
164 | { | |
165 | if (!path) | |
166 | path = "man"; | |
167 | execlp(path, "man", page, (char *)NULL); | |
168 | warning(_("failed to exec '%s': %s"), path, strerror(errno)); | |
169 | } | |
170 | ||
171 | static void exec_man_cmd(const char *cmd, const char *page) | |
172 | { | |
173 | struct strbuf shell_cmd = STRBUF_INIT; | |
174 | strbuf_addf(&shell_cmd, "%s %s", cmd, page); | |
175 | execl("/bin/sh", "sh", "-c", shell_cmd.buf, (char *)NULL); | |
176 | warning(_("failed to exec '%s': %s"), cmd, strerror(errno)); | |
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); | |
186 | *p = xcalloc(1, (sizeof(**p) + len + 1)); | |
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 | { | |
201 | struct man_viewer_info_list *new = xcalloc(1, sizeof(*new) + len + 1); | |
202 | ||
203 | strncpy(new->name, name, len); | |
204 | new->info = xstrdup(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, *subkey; | |
240 | int namelen; | |
241 | ||
242 | if (parse_config_key(var, "man", &name, &namelen, &subkey) < 0 || !name) | |
243 | return 0; | |
244 | ||
245 | if (!strcmp(subkey, "path")) { | |
246 | if (!value) | |
247 | return config_error_nonbool(var); | |
248 | return add_man_viewer_path(name, namelen, value); | |
249 | } | |
250 | if (!strcmp(subkey, "cmd")) { | |
251 | if (!value) | |
252 | return config_error_nonbool(var); | |
253 | return add_man_viewer_cmd(name, namelen, value); | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int git_help_config(const char *var, const char *value, void *cb) | |
260 | { | |
261 | if (starts_with(var, "column.")) | |
262 | return git_column_config(var, value, "help", &colopts); | |
263 | if (!strcmp(var, "help.format")) { | |
264 | if (!value) | |
265 | return config_error_nonbool(var); | |
266 | help_format = parse_help_format(value); | |
267 | return 0; | |
268 | } | |
269 | if (!strcmp(var, "help.htmlpath")) { | |
270 | if (!value) | |
271 | return config_error_nonbool(var); | |
272 | html_path = xstrdup(value); | |
273 | return 0; | |
274 | } | |
275 | if (!strcmp(var, "man.viewer")) { | |
276 | if (!value) | |
277 | return config_error_nonbool(var); | |
278 | add_man_viewer(value); | |
279 | return 0; | |
280 | } | |
281 | if (starts_with(var, "man.")) | |
282 | return add_man_viewer_info(var, value); | |
283 | ||
284 | return git_default_config(var, value, cb); | |
285 | } | |
286 | ||
287 | static struct cmdnames main_cmds, other_cmds; | |
288 | ||
289 | static int is_git_command(const char *s) | |
290 | { | |
291 | load_command_list("git-", &main_cmds, &other_cmds); | |
292 | return is_in_cmdlist(&main_cmds, s) || | |
293 | is_in_cmdlist(&other_cmds, s); | |
294 | } | |
295 | ||
296 | static const char *prepend(const char *prefix, const char *cmd) | |
297 | { | |
298 | size_t pre_len = strlen(prefix); | |
299 | size_t cmd_len = strlen(cmd); | |
300 | char *p = xmalloc(pre_len + cmd_len + 1); | |
301 | memcpy(p, prefix, pre_len); | |
302 | strcpy(p + pre_len, cmd); | |
303 | return p; | |
304 | } | |
305 | ||
306 | static const char *cmd_to_page(const char *git_cmd) | |
307 | { | |
308 | if (!git_cmd) | |
309 | return "git"; | |
310 | else if (starts_with(git_cmd, "git")) | |
311 | return git_cmd; | |
312 | else if (is_git_command(git_cmd)) | |
313 | return prepend("git-", git_cmd); | |
314 | else | |
315 | return prepend("git", git_cmd); | |
316 | } | |
317 | ||
318 | static void setup_man_path(void) | |
319 | { | |
320 | struct strbuf new_path = STRBUF_INIT; | |
321 | const char *old_path = getenv("MANPATH"); | |
322 | ||
323 | /* We should always put ':' after our path. If there is no | |
324 | * old_path, the ':' at the end will let 'man' to try | |
325 | * system-wide paths after ours to find the manual page. If | |
326 | * there is old_path, we need ':' as delimiter. */ | |
327 | strbuf_addstr(&new_path, system_path(GIT_MAN_PATH)); | |
328 | strbuf_addch(&new_path, ':'); | |
329 | if (old_path) | |
330 | strbuf_addstr(&new_path, old_path); | |
331 | ||
332 | setenv("MANPATH", new_path.buf, 1); | |
333 | ||
334 | strbuf_release(&new_path); | |
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 | ||
353 | static void show_man_page(const char *git_cmd) | |
354 | { | |
355 | struct man_viewer_list *viewer; | |
356 | const char *page = cmd_to_page(git_cmd); | |
357 | const char *fallback = getenv("GIT_MAN_VIEWER"); | |
358 | ||
359 | setup_man_path(); | |
360 | for (viewer = man_viewer_list; viewer; viewer = viewer->next) | |
361 | { | |
362 | exec_viewer(viewer->name, page); /* will return when unable */ | |
363 | } | |
364 | if (fallback) | |
365 | exec_viewer(fallback, page); | |
366 | exec_viewer("man", page); | |
367 | die(_("no man viewer handled the request")); | |
368 | } | |
369 | ||
370 | static void show_info_page(const char *git_cmd) | |
371 | { | |
372 | const char *page = cmd_to_page(git_cmd); | |
373 | setenv("INFOPATH", system_path(GIT_INFO_PATH), 1); | |
374 | execlp("info", "info", "gitman", page, (char *)NULL); | |
375 | die(_("no info viewer handled the request")); | |
376 | } | |
377 | ||
378 | static void get_html_page_path(struct strbuf *page_path, const char *page) | |
379 | { | |
380 | struct stat st; | |
381 | if (!html_path) | |
382 | html_path = system_path(GIT_HTML_PATH); | |
383 | ||
384 | /* Check that we have a git documentation directory. */ | |
385 | if (!strstr(html_path, "://")) { | |
386 | if (stat(mkpath("%s/git.html", html_path), &st) | |
387 | || !S_ISREG(st.st_mode)) | |
388 | die("'%s': not a documentation directory.", html_path); | |
389 | } | |
390 | ||
391 | strbuf_init(page_path, 0); | |
392 | strbuf_addf(page_path, "%s/%s.html", html_path, page); | |
393 | } | |
394 | ||
395 | /* | |
396 | * If open_html is not defined in a platform-specific way (see for | |
397 | * example compat/mingw.h), we use the script web--browse to display | |
398 | * HTML. | |
399 | */ | |
400 | #ifndef open_html | |
401 | static void open_html(const char *path) | |
402 | { | |
403 | execl_git_cmd("web--browse", "-c", "help.browser", path, (char *)NULL); | |
404 | } | |
405 | #endif | |
406 | ||
407 | static void show_html_page(const char *git_cmd) | |
408 | { | |
409 | const char *page = cmd_to_page(git_cmd); | |
410 | struct strbuf page_path; /* it leaks but we exec bellow */ | |
411 | ||
412 | get_html_page_path(&page_path, page); | |
413 | ||
414 | open_html(page_path.buf); | |
415 | } | |
416 | ||
417 | static struct { | |
418 | const char *name; | |
419 | const char *help; | |
420 | } common_guides[] = { | |
421 | { "attributes", N_("Defining attributes per path") }, | |
422 | { "glossary", N_("A Git glossary") }, | |
423 | { "ignore", N_("Specifies intentionally untracked files to ignore") }, | |
424 | { "modules", N_("Defining submodule properties") }, | |
425 | { "revisions", N_("Specifying revisions and ranges for Git") }, | |
426 | { "tutorial", N_("A tutorial introduction to Git (for version 1.5.1 or newer)") }, | |
427 | { "workflows", N_("An overview of recommended workflows with Git") }, | |
428 | }; | |
429 | ||
430 | static void list_common_guides_help(void) | |
431 | { | |
432 | int i, longest = 0; | |
433 | ||
434 | for (i = 0; i < ARRAY_SIZE(common_guides); i++) { | |
435 | if (longest < strlen(common_guides[i].name)) | |
436 | longest = strlen(common_guides[i].name); | |
437 | } | |
438 | ||
439 | puts(_("The common Git guides are:\n")); | |
440 | for (i = 0; i < ARRAY_SIZE(common_guides); i++) { | |
441 | printf(" %s ", common_guides[i].name); | |
442 | mput_char(' ', longest - strlen(common_guides[i].name)); | |
443 | puts(_(common_guides[i].help)); | |
444 | } | |
445 | putchar('\n'); | |
446 | } | |
447 | ||
448 | int cmd_help(int argc, const char **argv, const char *prefix) | |
449 | { | |
450 | int nongit; | |
451 | const char *alias; | |
452 | enum help_format parsed_help_format; | |
453 | ||
454 | argc = parse_options(argc, argv, prefix, builtin_help_options, | |
455 | builtin_help_usage, 0); | |
456 | parsed_help_format = help_format; | |
457 | ||
458 | if (show_all) { | |
459 | git_config(git_help_config, NULL); | |
460 | printf(_("usage: %s%s"), _(git_usage_string), "\n\n"); | |
461 | load_command_list("git-", &main_cmds, &other_cmds); | |
462 | list_commands(colopts, &main_cmds, &other_cmds); | |
463 | } | |
464 | ||
465 | if (show_guides) | |
466 | list_common_guides_help(); | |
467 | ||
468 | if (show_all || show_guides) { | |
469 | printf("%s\n", _(git_more_info_string)); | |
470 | /* | |
471 | * We're done. Ignore any remaining args | |
472 | */ | |
473 | return 0; | |
474 | } | |
475 | ||
476 | if (!argv[0]) { | |
477 | printf(_("usage: %s%s"), _(git_usage_string), "\n\n"); | |
478 | list_common_cmds_help(); | |
479 | printf("\n%s\n", _(git_more_info_string)); | |
480 | return 0; | |
481 | } | |
482 | ||
483 | setup_git_directory_gently(&nongit); | |
484 | git_config(git_help_config, NULL); | |
485 | ||
486 | if (parsed_help_format != HELP_FORMAT_NONE) | |
487 | help_format = parsed_help_format; | |
488 | if (help_format == HELP_FORMAT_NONE) | |
489 | help_format = parse_help_format(DEFAULT_HELP_FORMAT); | |
490 | ||
491 | alias = alias_lookup(argv[0]); | |
492 | if (alias && !is_git_command(argv[0])) { | |
493 | printf_ln(_("`git %s' is aliased to `%s'"), argv[0], alias); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | switch (help_format) { | |
498 | case HELP_FORMAT_NONE: | |
499 | case HELP_FORMAT_MAN: | |
500 | show_man_page(argv[0]); | |
501 | break; | |
502 | case HELP_FORMAT_INFO: | |
503 | show_info_page(argv[0]); | |
504 | break; | |
505 | case HELP_FORMAT_WEB: | |
506 | show_html_page(argv[0]); | |
507 | break; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } |