Git 2.20.1
[git/git.git] / help.c
CommitLineData
70827b15 1#include "cache.h"
b2141fc1 2#include "config.h"
70827b15 3#include "builtin.h"
d807c4a0 4#include "exec-cmd.h"
38124a40 5#include "run-command.h"
8af84dad 6#include "levenshtein.h"
940208a7 7#include "help.h"
cfb22a02 8#include "command-list.h"
dbfae689
NTND
9#include "string-list.h"
10#include "column.h"
816fb46b 11#include "version.h"
e5618106 12#include "refs.h"
b48cbfc5 13#include "parse-options.h"
64949984 14
cfb22a02
NTND
15struct category_description {
16 uint32_t category;
17 const char *desc;
18};
19static uint32_t common_mask =
20 CAT_init | CAT_worktree | CAT_info |
21 CAT_history | CAT_remote;
22static struct category_description common_categories[] = {
23 { CAT_init, N_("start a working area (see also: git help tutorial)") },
24 { CAT_worktree, N_("work on the current change (see also: git help everyday)") },
25 { CAT_info, N_("examine the history and state (see also: git help revisions)") },
26 { CAT_history, N_("grow, mark and tweak your common history") },
27 { CAT_remote, N_("collaborate (see also: git help workflows)") },
28 { 0, NULL }
29};
63eae83f
NTND
30static struct category_description main_categories[] = {
31 { CAT_mainporcelain, N_("Main Porcelain Commands") },
32 { CAT_ancillarymanipulators, N_("Ancillary Commands / Manipulators") },
33 { CAT_ancillaryinterrogators, N_("Ancillary Commands / Interrogators") },
34 { CAT_foreignscminterface, N_("Interacting with Others") },
35 { CAT_plumbingmanipulators, N_("Low-level Commands / Manipulators") },
36 { CAT_plumbinginterrogators, N_("Low-level Commands / Interrogators") },
37 { CAT_synchingrepositories, N_("Low-level Commands / Synching Repositories") },
38 { CAT_purehelpers, N_("Low-level Commands / Internal Helpers") },
39 { 0, NULL }
40};
cfb22a02 41
1b81d8cb 42static const char *drop_prefix(const char *name, uint32_t category)
cfb22a02
NTND
43{
44 const char *new_name;
45
46 if (skip_prefix(name, "git-", &new_name))
47 return new_name;
1b81d8cb
NTND
48 if (category == CAT_guide && skip_prefix(name, "git", &new_name))
49 return new_name;
cfb22a02
NTND
50 return name;
51
52}
53
54static void extract_cmds(struct cmdname_help **p_cmds, uint32_t mask)
55{
56 int i, nr = 0;
57 struct cmdname_help *cmds;
58
59 if (ARRAY_SIZE(command_list) == 0)
60 BUG("empty command_list[] is a sign of broken generate-cmdlist.sh");
61
62 ALLOC_ARRAY(cmds, ARRAY_SIZE(command_list) + 1);
63
64 for (i = 0; i < ARRAY_SIZE(command_list); i++) {
65 const struct cmdname_help *cmd = command_list + i;
66
67 if (!(cmd->category & mask))
68 continue;
69
70 cmds[nr] = *cmd;
1b81d8cb 71 cmds[nr].name = drop_prefix(cmd->name, cmd->category);
cfb22a02
NTND
72
73 nr++;
74 }
75 cmds[nr].name = NULL;
76 *p_cmds = cmds;
77}
78
79static void print_command_list(const struct cmdname_help *cmds,
80 uint32_t mask, int longest)
81{
82 int i;
83
84 for (i = 0; cmds[i].name; i++) {
85 if (cmds[i].category & mask) {
1c4b9859 86 size_t len = strlen(cmds[i].name);
cfb22a02 87 printf(" %s ", cmds[i].name);
1c4b9859 88 mput_char(' ', longest > len ? longest - len : 1);
cfb22a02
NTND
89 puts(_(cmds[i].help));
90 }
91 }
92}
93
94static int cmd_name_cmp(const void *elem1, const void *elem2)
95{
96 const struct cmdname_help *e1 = elem1;
97 const struct cmdname_help *e2 = elem2;
98
99 return strcmp(e1->name, e2->name);
100}
101
26c7d067
NTND
102static void print_cmd_by_category(const struct category_description *catdesc,
103 int *longest_p)
cfb22a02
NTND
104{
105 struct cmdname_help *cmds;
106 int longest = 0;
107 int i, nr = 0;
108 uint32_t mask = 0;
109
110 for (i = 0; catdesc[i].desc; i++)
111 mask |= catdesc[i].category;
112
113 extract_cmds(&cmds, mask);
114
115 for (i = 0; cmds[i].name; i++, nr++) {
116 if (longest < strlen(cmds[i].name))
117 longest = strlen(cmds[i].name);
118 }
119 QSORT(cmds, nr, cmd_name_cmp);
120
121 for (i = 0; catdesc[i].desc; i++) {
122 uint32_t mask = catdesc[i].category;
123 const char *desc = catdesc[i].desc;
124
125 printf("\n%s\n", _(desc));
126 print_command_list(cmds, mask, longest);
127 }
128 free(cmds);
26c7d067
NTND
129 if (longest_p)
130 *longest_p = longest;
cfb22a02
NTND
131}
132
940208a7 133void add_cmdname(struct cmdnames *cmds, const char *name, int len)
70827b15 134{
96ffc06f
JK
135 struct cmdname *ent;
136 FLEX_ALLOC_MEM(ent, name, name, len);
70827b15 137 ent->len = len;
1eb05690
SP
138
139 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
140 cmds->names[cmds->cnt++] = ent;
70827b15
LT
141}
142
8af84dad
JS
143static void clean_cmdnames(struct cmdnames *cmds)
144{
145 int i;
146 for (i = 0; i < cmds->cnt; ++i)
147 free(cmds->names[i]);
148 free(cmds->names);
149 cmds->cnt = 0;
150 cmds->alloc = 0;
151}
152
70827b15
LT
153static int cmdname_compare(const void *a_, const void *b_)
154{
155 struct cmdname *a = *(struct cmdname **)a_;
156 struct cmdname *b = *(struct cmdname **)b_;
157 return strcmp(a->name, b->name);
158}
159
1eb05690
SP
160static void uniq(struct cmdnames *cmds)
161{
162 int i, j;
163
164 if (!cmds->cnt)
165 return;
166
4a15758f
JK
167 for (i = j = 1; i < cmds->cnt; i++) {
168 if (!strcmp(cmds->names[i]->name, cmds->names[j-1]->name))
169 free(cmds->names[i]);
170 else
1eb05690 171 cmds->names[j++] = cmds->names[i];
4a15758f 172 }
1eb05690
SP
173
174 cmds->cnt = j;
175}
176
940208a7 177void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
f3fa1838 178{
1eb05690
SP
179 int ci, cj, ei;
180 int cmp;
181
182 ci = cj = ei = 0;
183 while (ci < cmds->cnt && ei < excludes->cnt) {
184 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
185 if (cmp < 0)
186 cmds->names[cj++] = cmds->names[ci++];
6a17f583
JH
187 else if (cmp == 0) {
188 ei++;
189 free(cmds->names[ci++]);
190 } else if (cmp > 0)
1eb05690
SP
191 ei++;
192 }
193
194 while (ci < cmds->cnt)
195 cmds->names[cj++] = cmds->names[ci++];
196
197 cmds->cnt = cj;
198}
199
d10cb3df 200static void pretty_print_cmdnames(struct cmdnames *cmds, unsigned int colopts)
70827b15 201{
dbfae689
NTND
202 struct string_list list = STRING_LIST_INIT_NODUP;
203 struct column_options copts;
204 int i;
70827b15 205
dbfae689
NTND
206 for (i = 0; i < cmds->cnt; i++)
207 string_list_append(&list, cmds->names[i]->name);
208 /*
209 * always enable column display, we only consult column.*
210 * about layout strategy and stuff
211 */
212 colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
213 memset(&copts, 0, sizeof(copts));
214 copts.indent = " ";
215 copts.padding = 2;
216 print_columns(&list, colopts, &copts);
217 string_list_clear(&list, 0);
70827b15
LT
218}
219
e321180e 220static void list_commands_in_dir(struct cmdnames *cmds,
940208a7
MV
221 const char *path,
222 const char *prefix)
70827b15 223{
1eb05690 224 DIR *dir = opendir(path);
70827b15 225 struct dirent *de;
f5d600e2
JS
226 struct strbuf buf = STRBUF_INIT;
227 int len;
70827b15 228
f5d600e2 229 if (!dir)
e321180e 230 return;
940208a7
MV
231 if (!prefix)
232 prefix = "git-";
70827b15 233
f5d600e2
JS
234 strbuf_addf(&buf, "%s/", path);
235 len = buf.len;
236
70827b15 237 while ((de = readdir(dir)) != NULL) {
de8118e1 238 const char *ent;
26936bfd 239 size_t entlen;
70827b15 240
de8118e1 241 if (!skip_prefix(de->d_name, prefix, &ent))
70827b15 242 continue;
0966003c 243
f5d600e2
JS
244 strbuf_setlen(&buf, len);
245 strbuf_addstr(&buf, de->d_name);
246 if (!is_executable(buf.buf))
70827b15
LT
247 continue;
248
de8118e1 249 entlen = strlen(ent);
6e409473 250 strip_suffix(ent, ".exe", &entlen);
70827b15 251
de8118e1 252 add_cmdname(cmds, ent, entlen);
70827b15
LT
253 }
254 closedir(dir);
f5d600e2 255 strbuf_release(&buf);
1eb05690
SP
256}
257
e321180e 258void load_command_list(const char *prefix,
940208a7
MV
259 struct cmdnames *main_cmds,
260 struct cmdnames *other_cmds)
1eb05690 261{
1eb05690 262 const char *env_path = getenv("PATH");
1eb05690
SP
263 const char *exec_path = git_exec_path();
264
1f08e5ce 265 if (exec_path) {
e321180e 266 list_commands_in_dir(main_cmds, exec_path, prefix);
9ed0d8d6 267 QSORT(main_cmds->names, main_cmds->cnt, cmdname_compare);
1f08e5ce 268 uniq(main_cmds);
1eb05690
SP
269 }
270
1f08e5ce
AR
271 if (env_path) {
272 char *paths, *path, *colon;
273 path = paths = xstrdup(env_path);
274 while (1) {
275 if ((colon = strchr(path, PATH_SEP)))
276 *colon = 0;
746c221a
PB
277 if (!exec_path || strcmp(path, exec_path))
278 list_commands_in_dir(other_cmds, path, prefix);
1eb05690 279
1f08e5ce
AR
280 if (!colon)
281 break;
282 path = colon + 1;
283 }
284 free(paths);
1eb05690 285
9ed0d8d6 286 QSORT(other_cmds->names, other_cmds->cnt, cmdname_compare);
1f08e5ce
AR
287 uniq(other_cmds);
288 }
940208a7 289 exclude_cmds(other_cmds, main_cmds);
2156435f
JK
290}
291
f4ed0af6 292void list_commands(unsigned int colopts,
dbfae689 293 struct cmdnames *main_cmds, struct cmdnames *other_cmds)
2156435f 294{
940208a7 295 if (main_cmds->cnt) {
61c5d431 296 const char *exec_path = git_exec_path();
4470ef94 297 printf_ln(_("available git commands in '%s'"), exec_path);
1eb05690 298 putchar('\n');
d10cb3df 299 pretty_print_cmdnames(main_cmds, colopts);
1eb05690
SP
300 putchar('\n');
301 }
302
940208a7 303 if (other_cmds->cnt) {
4470ef94 304 printf_ln(_("git commands available from elsewhere on your $PATH"));
940208a7 305 putchar('\n');
d10cb3df 306 pretty_print_cmdnames(other_cmds, colopts);
1eb05690
SP
307 putchar('\n');
308 }
70827b15
LT
309}
310
1542d4cd 311void list_common_cmds_help(void)
22414770 312{
22414770 313 puts(_("These are common Git commands used in various situations:"));
26c7d067 314 print_cmd_by_category(common_categories, NULL);
1542d4cd 315}
22414770 316
6bb2dc0b
NTND
317void list_all_main_cmds(struct string_list *list)
318{
319 struct cmdnames main_cmds, other_cmds;
320 int i;
321
322 memset(&main_cmds, 0, sizeof(main_cmds));
323 memset(&other_cmds, 0, sizeof(other_cmds));
324 load_command_list("git-", &main_cmds, &other_cmds);
325
326 for (i = 0; i < main_cmds.cnt; i++)
327 string_list_append(list, main_cmds.names[i]->name);
328
329 clean_cmdnames(&main_cmds);
330 clean_cmdnames(&other_cmds);
22414770
SG
331}
332
6bb2dc0b 333void list_all_other_cmds(struct string_list *list)
1542d4cd 334{
6bb2dc0b
NTND
335 struct cmdnames main_cmds, other_cmds;
336 int i;
1542d4cd 337
6bb2dc0b
NTND
338 memset(&main_cmds, 0, sizeof(main_cmds));
339 memset(&other_cmds, 0, sizeof(other_cmds));
340 load_command_list("git-", &main_cmds, &other_cmds);
1542d4cd 341
6bb2dc0b
NTND
342 for (i = 0; i < other_cmds.cnt; i++)
343 string_list_append(list, other_cmds.names[i]->name);
22414770 344
6bb2dc0b
NTND
345 clean_cmdnames(&main_cmds);
346 clean_cmdnames(&other_cmds);
347}
348
3c777767
NTND
349void list_cmds_by_category(struct string_list *list,
350 const char *cat)
351{
352 int i, n = ARRAY_SIZE(command_list);
353 uint32_t cat_id = 0;
22414770 354
3c777767
NTND
355 for (i = 0; category_names[i]; i++) {
356 if (!strcmp(cat, category_names[i])) {
357 cat_id = 1UL << i;
358 break;
22414770 359 }
3c777767
NTND
360 }
361 if (!cat_id)
362 die(_("unsupported command listing type '%s'"), cat);
363
364 for (i = 0; i < n; i++) {
365 struct cmdname_help *cmd = command_list + i;
366
1b81d8cb
NTND
367 if (!(cmd->category & cat_id))
368 continue;
369 string_list_append(list, drop_prefix(cmd->name, cmd->category));
3c777767
NTND
370 }
371}
372
6532f374
NTND
373void list_cmds_by_config(struct string_list *list)
374{
375 const char *cmd_list;
376
377 /*
378 * There's no actual repository setup at this point (and even
379 * if there is, we don't really care; only global config
380 * matters). If we accidentally set up a repository, it's ok
381 * too since the caller (git --list-cmds=) should exit shortly
382 * anyway.
383 */
384 if (git_config_get_string_const("completion.commands", &cmd_list))
385 return;
386
387 string_list_sort(list);
388 string_list_remove_duplicates(list, 0);
389
390 while (*cmd_list) {
391 struct strbuf sb = STRBUF_INIT;
392 const char *p = strchrnul(cmd_list, ' ');
22414770 393
6532f374
NTND
394 strbuf_add(&sb, cmd_list, p - cmd_list);
395 if (*cmd_list == '-')
396 string_list_remove(list, cmd_list + 1, 0);
397 else
398 string_list_insert(list, sb.buf);
399 strbuf_release(&sb);
400 while (*p == ' ')
401 p++;
402 cmd_list = p;
1542d4cd
JH
403 }
404}
405
1b81d8cb
NTND
406void list_common_guides_help(void)
407{
408 struct category_description catdesc[] = {
409 { CAT_guide, N_("The common Git guides are:") },
410 { 0, NULL }
411 };
26c7d067 412 print_cmd_by_category(catdesc, NULL);
1b81d8cb
NTND
413 putchar('\n');
414}
415
3ac68a93
NTND
416struct slot_expansion {
417 const char *prefix;
418 const char *placeholder;
419 void (*fn)(struct string_list *list, const char *prefix);
420 int found;
421};
422
e17ca926 423void list_config_help(int for_human)
3ac68a93
NTND
424{
425 struct slot_expansion slot_expansions[] = {
426 { "advice", "*", list_config_advices },
427 { "color.branch", "<slot>", list_config_color_branch_slots },
428 { "color.decorate", "<slot>", list_config_color_decorate_slots },
429 { "color.diff", "<slot>", list_config_color_diff_slots },
430 { "color.grep", "<slot>", list_config_color_grep_slots },
431 { "color.interactive", "<slot>", list_config_color_interactive_slots },
bf1a11f0 432 { "color.remote", "<slot>", list_config_color_sideband_slots },
3ac68a93
NTND
433 { "color.status", "<slot>", list_config_color_status_slots },
434 { "fsck", "<msg-id>", list_config_fsck_msg_ids },
435 { "receive.fsck", "<msg-id>", list_config_fsck_msg_ids },
436 { NULL, NULL, NULL }
437 };
438 const char **p;
439 struct slot_expansion *e;
440 struct string_list keys = STRING_LIST_INIT_DUP;
441 int i;
442
443 for (p = config_name_list; *p; p++) {
444 const char *var = *p;
445 struct strbuf sb = STRBUF_INIT;
446
447 for (e = slot_expansions; e->prefix; e++) {
448
449 strbuf_reset(&sb);
450 strbuf_addf(&sb, "%s.%s", e->prefix, e->placeholder);
451 if (!strcasecmp(var, sb.buf)) {
452 e->fn(&keys, e->prefix);
453 e->found++;
454 break;
455 }
456 }
457 strbuf_release(&sb);
458 if (!e->prefix)
459 string_list_append(&keys, var);
460 }
461
462 for (e = slot_expansions; e->prefix; e++)
463 if (!e->found)
464 BUG("slot_expansion %s.%s is not used",
465 e->prefix, e->placeholder);
466
467 string_list_sort(&keys);
e17ca926
NTND
468 for (i = 0; i < keys.nr; i++) {
469 const char *var = keys.items[i].string;
470 const char *wildcard, *tag, *cut;
471
472 if (for_human) {
473 puts(var);
474 continue;
475 }
476
477 wildcard = strchr(var, '*');
478 tag = strchr(var, '<');
479
480 if (!wildcard && !tag) {
481 puts(var);
482 continue;
483 }
484
485 if (wildcard && !tag)
486 cut = wildcard;
487 else if (!wildcard && tag)
488 cut = tag;
489 else
490 cut = wildcard < tag ? wildcard : tag;
491
492 /*
493 * We may produce duplicates, but that's up to
494 * git-completion.bash to handle
495 */
496 printf("%.*s\n", (int)(cut - var), var);
497 }
3ac68a93
NTND
498 string_list_clear(&keys, 0);
499}
500
26c7d067
NTND
501static int get_alias(const char *var, const char *value, void *data)
502{
503 struct string_list *list = data;
504
505 if (skip_prefix(var, "alias.", &var))
506 string_list_append(list, var)->util = xstrdup(value);
507
508 return 0;
509}
510
63eae83f
NTND
511void list_all_cmds_help(void)
512{
26c7d067
NTND
513 struct string_list others = STRING_LIST_INIT_DUP;
514 struct string_list alias_list = STRING_LIST_INIT_DUP;
515 struct cmdname_help *aliases;
516 int i, longest;
517
518 printf_ln(_("See 'git help <command>' to read about a specific subcommand"));
519 print_cmd_by_category(main_categories, &longest);
520
521 list_all_other_cmds(&others);
522 if (others.nr)
523 printf("\n%s\n", _("External commands"));
524 for (i = 0; i < others.nr; i++)
525 printf(" %s\n", others.items[i].string);
526 string_list_clear(&others, 0);
527
528 git_config(get_alias, &alias_list);
529 string_list_sort(&alias_list);
1c4b9859
JS
530
531 for (i = 0; i < alias_list.nr; i++) {
532 size_t len = strlen(alias_list.items[i].string);
533 if (longest < len)
534 longest = len;
535 }
536
26c7d067
NTND
537 if (alias_list.nr) {
538 printf("\n%s\n", _("Command aliases"));
539 ALLOC_ARRAY(aliases, alias_list.nr + 1);
540 for (i = 0; i < alias_list.nr; i++) {
541 aliases[i].name = alias_list.items[i].string;
542 aliases[i].help = alias_list.items[i].util;
543 aliases[i].category = 1;
544 }
545 aliases[alias_list.nr].name = NULL;
546 print_command_list(aliases, 1, longest);
547 free(aliases);
548 }
549 string_list_clear(&alias_list, 1);
63eae83f
NTND
550}
551
940208a7 552int is_in_cmdlist(struct cmdnames *c, const char *s)
2156435f
JK
553{
554 int i;
555 for (i = 0; i < c->cnt; i++)
556 if (!strcmp(s, c->names[i]->name))
557 return 1;
558 return 0;
559}
560
f0e90716 561static int autocorrect;
746c221a 562static struct cmdnames aliases;
f0e90716
AR
563
564static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
565{
ae021d87
JK
566 const char *p;
567
f0e90716
AR
568 if (!strcmp(var, "help.autocorrect"))
569 autocorrect = git_config_int(var,value);
746c221a 570 /* Also use aliases for command lookup */
ae021d87
JK
571 if (skip_prefix(var, "alias.", &p))
572 add_cmdname(&aliases, p, strlen(p));
f0e90716
AR
573
574 return git_default_config(var, value, cb);
575}
576
8af84dad 577static int levenshtein_compare(const void *p1, const void *p2)
822a7d50 578{
8af84dad
JS
579 const struct cmdname *const *c1 = p1, *const *c2 = p2;
580 const char *s1 = (*c1)->name, *s2 = (*c2)->name;
581 int l1 = (*c1)->len;
582 int l2 = (*c2)->len;
583 return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
584}
585
746c221a
PB
586static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
587{
588 int i;
589 ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
590
591 for (i = 0; i < old->cnt; i++)
592 cmds->names[cmds->cnt++] = old->names[i];
88ce3ef6 593 FREE_AND_NULL(old->names);
746c221a 594 old->cnt = 0;
746c221a
PB
595}
596
06500a02 597/* An empirically derived magic number */
6612b9e4
EFL
598#define SIMILARITY_FLOOR 7
599#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
06500a02 600
823e0ded
MS
601static const char bad_interpreter_advice[] =
602 N_("'%s' appears to be a git command, but we were not\n"
603 "able to execute it. Maybe git-%s is broken?");
604
8af84dad 605const char *help_unknown_cmd(const char *cmd)
822a7d50 606{
8af84dad
JS
607 int i, n, best_similarity = 0;
608 struct cmdnames main_cmds, other_cmds;
cfb22a02 609 struct cmdname_help *common_cmds;
8af84dad
JS
610
611 memset(&main_cmds, 0, sizeof(main_cmds));
0b74f5dc 612 memset(&other_cmds, 0, sizeof(other_cmds));
746c221a 613 memset(&aliases, 0, sizeof(aliases));
8af84dad 614
659fef19 615 read_early_config(git_unknown_cmd_config, NULL);
f0e90716 616
8af84dad
JS
617 load_command_list("git-", &main_cmds, &other_cmds);
618
746c221a
PB
619 add_cmd_list(&main_cmds, &aliases);
620 add_cmd_list(&main_cmds, &other_cmds);
9ed0d8d6 621 QSORT(main_cmds.names, main_cmds.cnt, cmdname_compare);
746c221a 622 uniq(&main_cmds);
8af84dad 623
cfb22a02
NTND
624 extract_cmds(&common_cmds, common_mask);
625
6612b9e4
EFL
626 /* This abuses cmdname->len for levenshtein distance */
627 for (i = 0, n = 0; i < main_cmds.cnt; i++) {
628 int cmp = 0; /* avoid compiler stupidity */
629 const char *candidate = main_cmds.names[i]->name;
630
823e0ded
MS
631 /*
632 * An exact match means we have the command, but
633 * for some reason exec'ing it gave us ENOENT; probably
634 * it's a bad interpreter in the #! line.
635 */
636 if (!strcmp(candidate, cmd))
637 die(_(bad_interpreter_advice), cmd, cmd);
638
6612b9e4 639 /* Does the candidate appear in common_cmds list? */
cfb22a02 640 while (common_cmds[n].name &&
6612b9e4
EFL
641 (cmp = strcmp(common_cmds[n].name, candidate)) < 0)
642 n++;
cfb22a02 643 if (common_cmds[n].name && !cmp) {
6612b9e4
EFL
644 /* Yes, this is one of the common commands */
645 n++; /* use the entry from common_cmds[] */
59556548 646 if (starts_with(candidate, cmd)) {
6612b9e4
EFL
647 /* Give prefix match a very good score */
648 main_cmds.names[i]->len = 0;
649 continue;
650 }
651 }
652
8af84dad 653 main_cmds.names[i]->len =
c41494f8 654 levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
6612b9e4 655 }
cfb22a02 656 FREE_AND_NULL(common_cmds);
8af84dad 657
9ed0d8d6 658 QSORT(main_cmds.names, main_cmds.cnt, levenshtein_compare);
8af84dad
JS
659
660 if (!main_cmds.cnt)
9665627d 661 die(_("Uh oh. Your system reports no Git commands at all."));
8af84dad 662
6612b9e4
EFL
663 /* skip and count prefix matches */
664 for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
665 ; /* still counting */
666
667 if (main_cmds.cnt <= n) {
668 /* prefix matches with everything? that is too ambiguous */
669 best_similarity = SIMILARITY_FLOOR + 1;
670 } else {
671 /* count all the most similar ones */
672 for (best_similarity = main_cmds.names[n++]->len;
673 (n < main_cmds.cnt &&
674 best_similarity == main_cmds.names[n]->len);
675 n++)
676 ; /* still counting */
677 }
06500a02 678 if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
8af84dad
JS
679 const char *assumed = main_cmds.names[0]->name;
680 main_cmds.names[0] = NULL;
681 clean_cmdnames(&main_cmds);
9665627d
NTND
682 fprintf_ln(stderr,
683 _("WARNING: You called a Git command named '%s', "
968b1fe2
MB
684 "which does not exist."),
685 cmd);
686 if (autocorrect < 0)
687 fprintf_ln(stderr,
688 _("Continuing under the assumption that "
689 "you meant '%s'."),
690 assumed);
691 else {
692 fprintf_ln(stderr,
693 _("Continuing in %0.1f seconds, "
694 "assuming that you meant '%s'."),
695 (float)autocorrect/10.0, assumed);
2024d317 696 sleep_millisec(autocorrect * 100);
f0e90716 697 }
8af84dad
JS
698 return assumed;
699 }
700
9665627d 701 fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
8af84dad 702
06500a02 703 if (SIMILAR_ENOUGH(best_similarity)) {
9665627d 704 fprintf_ln(stderr,
6c486862
JNA
705 Q_("\nThe most similar command is",
706 "\nThe most similar commands are",
9665627d 707 n));
8af84dad
JS
708
709 for (i = 0; i < n; i++)
710 fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
711 }
712
822a7d50
RJ
713 exit(1);
714}
715
a633fca0 716int cmd_version(int argc, const char **argv, const char *prefix)
70827b15 717{
b48cbfc5
JK
718 int build_options = 0;
719 const char * const usage[] = {
720 N_("git version [<options>]"),
721 NULL
722 };
723 struct option options[] = {
724 OPT_BOOL(0, "build-options", &build_options,
725 "also print build options"),
726 OPT_END()
727 };
728
729 argc = parse_options(argc, argv, prefix, options, usage, 0);
730
f2de0b97
DA
731 /*
732 * The format of this string should be kept stable for compatibility
733 * with external projects that rely on the output of "git version".
b48cbfc5
JK
734 *
735 * Always show the version, even if other options are given.
f2de0b97 736 */
70827b15 737 printf("git version %s\n", git_version_string);
b48cbfc5
JK
738
739 if (build_options) {
b2289404 740 printf("cpu: %s\n", GIT_HOST_CPU);
ed32b788
JS
741 if (git_built_from_commit_string[0])
742 printf("built from commit: %s\n",
743 git_built_from_commit_string);
744 else
745 printf("no commit associated with this build\n");
b48cbfc5 746 printf("sizeof-long: %d\n", (int)sizeof(long));
6c213e86 747 printf("sizeof-size_t: %d\n", (int)sizeof(size_t));
b48cbfc5 748 /* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
6b9c38e1 749 }
70827b15
LT
750 return 0;
751}
e5618106
VV
752
753struct similar_ref_cb {
754 const char *base_ref;
755 struct string_list *similar_refs;
756};
757
91d6e94e 758static int append_similar_ref(const char *refname, const struct object_id *oid,
e5618106
VV
759 int flags, void *cb_data)
760{
761 struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);
762 char *branch = strrchr(refname, '/') + 1;
95b567c7
JK
763 const char *remote;
764
e5618106 765 /* A remote branch of the same name is deemed similar */
95b567c7 766 if (skip_prefix(refname, "refs/remotes/", &remote) &&
e5618106 767 !strcmp(branch, cb->base_ref))
95b567c7 768 string_list_append(cb->similar_refs, remote);
e5618106
VV
769 return 0;
770}
771
772static struct string_list guess_refs(const char *ref)
773{
774 struct similar_ref_cb ref_cb;
775 struct string_list similar_refs = STRING_LIST_INIT_NODUP;
776
777 ref_cb.base_ref = ref;
778 ref_cb.similar_refs = &similar_refs;
779 for_each_ref(append_similar_ref, &ref_cb);
780 return similar_refs;
781}
782
783void help_unknown_ref(const char *ref, const char *cmd, const char *error)
784{
785 int i;
786 struct string_list suggested_refs = guess_refs(ref);
787
788 fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);
789
790 if (suggested_refs.nr > 0) {
791 fprintf_ln(stderr,
792 Q_("\nDid you mean this?",
793 "\nDid you mean one of these?",
794 suggested_refs.nr));
795 for (i = 0; i < suggested_refs.nr; i++)
796 fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);
797 }
798
799 string_list_clear(&suggested_refs, 0);
800 exit(1);
801}