Merge branch 'jc/triangle-push-fixup'
[git/jrn.git] / help.c
blob08c54ef1c1669edce960c52948b80340c36eb119
1 #include "cache.h"
2 #include "builtin.h"
3 #include "exec_cmd.h"
4 #include "levenshtein.h"
5 #include "help.h"
6 #include "common-cmds.h"
7 #include "string-list.h"
8 #include "column.h"
9 #include "version.h"
10 #include "refs.h"
12 void add_cmdname(struct cmdnames *cmds, const char *name, int len)
14 struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1);
16 ent->len = len;
17 memcpy(ent->name, name, len);
18 ent->name[len] = 0;
20 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
21 cmds->names[cmds->cnt++] = ent;
24 static void clean_cmdnames(struct cmdnames *cmds)
26 int i;
27 for (i = 0; i < cmds->cnt; ++i)
28 free(cmds->names[i]);
29 free(cmds->names);
30 cmds->cnt = 0;
31 cmds->alloc = 0;
34 static int cmdname_compare(const void *a_, const void *b_)
36 struct cmdname *a = *(struct cmdname **)a_;
37 struct cmdname *b = *(struct cmdname **)b_;
38 return strcmp(a->name, b->name);
41 static void uniq(struct cmdnames *cmds)
43 int i, j;
45 if (!cmds->cnt)
46 return;
48 for (i = j = 1; i < cmds->cnt; i++) {
49 if (!strcmp(cmds->names[i]->name, cmds->names[j-1]->name))
50 free(cmds->names[i]);
51 else
52 cmds->names[j++] = cmds->names[i];
55 cmds->cnt = j;
58 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
60 int ci, cj, ei;
61 int cmp;
63 ci = cj = ei = 0;
64 while (ci < cmds->cnt && ei < excludes->cnt) {
65 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
66 if (cmp < 0)
67 cmds->names[cj++] = cmds->names[ci++];
68 else if (cmp == 0) {
69 ei++;
70 free(cmds->names[ci++]);
71 } else if (cmp > 0)
72 ei++;
75 while (ci < cmds->cnt)
76 cmds->names[cj++] = cmds->names[ci++];
78 cmds->cnt = cj;
81 static void pretty_print_string_list(struct cmdnames *cmds,
82 unsigned int colopts)
84 struct string_list list = STRING_LIST_INIT_NODUP;
85 struct column_options copts;
86 int i;
88 for (i = 0; i < cmds->cnt; i++)
89 string_list_append(&list, cmds->names[i]->name);
91 * always enable column display, we only consult column.*
92 * about layout strategy and stuff
94 colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
95 memset(&copts, 0, sizeof(copts));
96 copts.indent = " ";
97 copts.padding = 2;
98 print_columns(&list, colopts, &copts);
99 string_list_clear(&list, 0);
102 static int is_executable(const char *name)
104 struct stat st;
106 if (stat(name, &st) || /* stat, not lstat */
107 !S_ISREG(st.st_mode))
108 return 0;
110 #if defined(GIT_WINDOWS_NATIVE) || defined(__CYGWIN__)
111 #if defined(__CYGWIN__)
112 if ((st.st_mode & S_IXUSR) == 0)
113 #endif
114 { /* cannot trust the executable bit, peek into the file instead */
115 char buf[3] = { 0 };
116 int n;
117 int fd = open(name, O_RDONLY);
118 st.st_mode &= ~S_IXUSR;
119 if (fd >= 0) {
120 n = read(fd, buf, 2);
121 if (n == 2)
122 /* DOS executables start with "MZ" */
123 if (!strcmp(buf, "#!") || !strcmp(buf, "MZ"))
124 st.st_mode |= S_IXUSR;
125 close(fd);
128 #endif
129 return st.st_mode & S_IXUSR;
132 static void list_commands_in_dir(struct cmdnames *cmds,
133 const char *path,
134 const char *prefix)
136 int prefix_len;
137 DIR *dir = opendir(path);
138 struct dirent *de;
139 struct strbuf buf = STRBUF_INIT;
140 int len;
142 if (!dir)
143 return;
144 if (!prefix)
145 prefix = "git-";
146 prefix_len = strlen(prefix);
148 strbuf_addf(&buf, "%s/", path);
149 len = buf.len;
151 while ((de = readdir(dir)) != NULL) {
152 int entlen;
154 if (prefixcmp(de->d_name, prefix))
155 continue;
157 strbuf_setlen(&buf, len);
158 strbuf_addstr(&buf, de->d_name);
159 if (!is_executable(buf.buf))
160 continue;
162 entlen = strlen(de->d_name) - prefix_len;
163 if (has_extension(de->d_name, ".exe"))
164 entlen -= 4;
166 add_cmdname(cmds, de->d_name + prefix_len, entlen);
168 closedir(dir);
169 strbuf_release(&buf);
172 void load_command_list(const char *prefix,
173 struct cmdnames *main_cmds,
174 struct cmdnames *other_cmds)
176 const char *env_path = getenv("PATH");
177 const char *exec_path = git_exec_path();
179 if (exec_path) {
180 list_commands_in_dir(main_cmds, exec_path, prefix);
181 qsort(main_cmds->names, main_cmds->cnt,
182 sizeof(*main_cmds->names), cmdname_compare);
183 uniq(main_cmds);
186 if (env_path) {
187 char *paths, *path, *colon;
188 path = paths = xstrdup(env_path);
189 while (1) {
190 if ((colon = strchr(path, PATH_SEP)))
191 *colon = 0;
192 if (!exec_path || strcmp(path, exec_path))
193 list_commands_in_dir(other_cmds, path, prefix);
195 if (!colon)
196 break;
197 path = colon + 1;
199 free(paths);
201 qsort(other_cmds->names, other_cmds->cnt,
202 sizeof(*other_cmds->names), cmdname_compare);
203 uniq(other_cmds);
205 exclude_cmds(other_cmds, main_cmds);
208 void list_commands(unsigned int colopts,
209 struct cmdnames *main_cmds, struct cmdnames *other_cmds)
211 if (main_cmds->cnt) {
212 const char *exec_path = git_exec_path();
213 printf_ln(_("available git commands in '%s'"), exec_path);
214 putchar('\n');
215 pretty_print_string_list(main_cmds, colopts);
216 putchar('\n');
219 if (other_cmds->cnt) {
220 printf_ln(_("git commands available from elsewhere on your $PATH"));
221 putchar('\n');
222 pretty_print_string_list(other_cmds, colopts);
223 putchar('\n');
227 void list_common_cmds_help(void)
229 int i, longest = 0;
231 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
232 if (longest < strlen(common_cmds[i].name))
233 longest = strlen(common_cmds[i].name);
236 puts(_("The most commonly used git commands are:"));
237 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
238 printf(" %s ", common_cmds[i].name);
239 mput_char(' ', longest - strlen(common_cmds[i].name));
240 puts(_(common_cmds[i].help));
244 int is_in_cmdlist(struct cmdnames *c, const char *s)
246 int i;
247 for (i = 0; i < c->cnt; i++)
248 if (!strcmp(s, c->names[i]->name))
249 return 1;
250 return 0;
253 static int autocorrect;
254 static struct cmdnames aliases;
256 static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
258 if (!strcmp(var, "help.autocorrect"))
259 autocorrect = git_config_int(var,value);
260 /* Also use aliases for command lookup */
261 if (!prefixcmp(var, "alias."))
262 add_cmdname(&aliases, var + 6, strlen(var + 6));
264 return git_default_config(var, value, cb);
267 static int levenshtein_compare(const void *p1, const void *p2)
269 const struct cmdname *const *c1 = p1, *const *c2 = p2;
270 const char *s1 = (*c1)->name, *s2 = (*c2)->name;
271 int l1 = (*c1)->len;
272 int l2 = (*c2)->len;
273 return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
276 static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
278 int i;
279 ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
281 for (i = 0; i < old->cnt; i++)
282 cmds->names[cmds->cnt++] = old->names[i];
283 free(old->names);
284 old->cnt = 0;
285 old->names = NULL;
288 /* An empirically derived magic number */
289 #define SIMILARITY_FLOOR 7
290 #define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
292 static const char bad_interpreter_advice[] =
293 N_("'%s' appears to be a git command, but we were not\n"
294 "able to execute it. Maybe git-%s is broken?");
296 const char *help_unknown_cmd(const char *cmd)
298 int i, n, best_similarity = 0;
299 struct cmdnames main_cmds, other_cmds;
301 memset(&main_cmds, 0, sizeof(main_cmds));
302 memset(&other_cmds, 0, sizeof(other_cmds));
303 memset(&aliases, 0, sizeof(aliases));
305 git_config(git_unknown_cmd_config, NULL);
307 load_command_list("git-", &main_cmds, &other_cmds);
309 add_cmd_list(&main_cmds, &aliases);
310 add_cmd_list(&main_cmds, &other_cmds);
311 qsort(main_cmds.names, main_cmds.cnt,
312 sizeof(main_cmds.names), cmdname_compare);
313 uniq(&main_cmds);
315 /* This abuses cmdname->len for levenshtein distance */
316 for (i = 0, n = 0; i < main_cmds.cnt; i++) {
317 int cmp = 0; /* avoid compiler stupidity */
318 const char *candidate = main_cmds.names[i]->name;
321 * An exact match means we have the command, but
322 * for some reason exec'ing it gave us ENOENT; probably
323 * it's a bad interpreter in the #! line.
325 if (!strcmp(candidate, cmd))
326 die(_(bad_interpreter_advice), cmd, cmd);
328 /* Does the candidate appear in common_cmds list? */
329 while (n < ARRAY_SIZE(common_cmds) &&
330 (cmp = strcmp(common_cmds[n].name, candidate)) < 0)
331 n++;
332 if ((n < ARRAY_SIZE(common_cmds)) && !cmp) {
333 /* Yes, this is one of the common commands */
334 n++; /* use the entry from common_cmds[] */
335 if (!prefixcmp(candidate, cmd)) {
336 /* Give prefix match a very good score */
337 main_cmds.names[i]->len = 0;
338 continue;
342 main_cmds.names[i]->len =
343 levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
346 qsort(main_cmds.names, main_cmds.cnt,
347 sizeof(*main_cmds.names), levenshtein_compare);
349 if (!main_cmds.cnt)
350 die(_("Uh oh. Your system reports no Git commands at all."));
352 /* skip and count prefix matches */
353 for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
354 ; /* still counting */
356 if (main_cmds.cnt <= n) {
357 /* prefix matches with everything? that is too ambiguous */
358 best_similarity = SIMILARITY_FLOOR + 1;
359 } else {
360 /* count all the most similar ones */
361 for (best_similarity = main_cmds.names[n++]->len;
362 (n < main_cmds.cnt &&
363 best_similarity == main_cmds.names[n]->len);
364 n++)
365 ; /* still counting */
367 if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
368 const char *assumed = main_cmds.names[0]->name;
369 main_cmds.names[0] = NULL;
370 clean_cmdnames(&main_cmds);
371 fprintf_ln(stderr,
372 _("WARNING: You called a Git command named '%s', "
373 "which does not exist.\n"
374 "Continuing under the assumption that you meant '%s'"),
375 cmd, assumed);
376 if (autocorrect > 0) {
377 fprintf_ln(stderr, _("in %0.1f seconds automatically..."),
378 (float)autocorrect/10.0);
379 poll(NULL, 0, autocorrect * 100);
381 return assumed;
384 fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
386 if (SIMILAR_ENOUGH(best_similarity)) {
387 fprintf_ln(stderr,
388 Q_("\nDid you mean this?",
389 "\nDid you mean one of these?",
390 n));
392 for (i = 0; i < n; i++)
393 fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
396 exit(1);
399 int cmd_version(int argc, const char **argv, const char *prefix)
402 * The format of this string should be kept stable for compatibility
403 * with external projects that rely on the output of "git version".
405 printf("git version %s\n", git_version_string);
406 return 0;
409 struct similar_ref_cb {
410 const char *base_ref;
411 struct string_list *similar_refs;
414 static int append_similar_ref(const char *refname, const unsigned char *sha1,
415 int flags, void *cb_data)
417 struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);
418 char *branch = strrchr(refname, '/') + 1;
419 /* A remote branch of the same name is deemed similar */
420 if (!prefixcmp(refname, "refs/remotes/") &&
421 !strcmp(branch, cb->base_ref))
422 string_list_append(cb->similar_refs,
423 refname + strlen("refs/remotes/"));
424 return 0;
427 static struct string_list guess_refs(const char *ref)
429 struct similar_ref_cb ref_cb;
430 struct string_list similar_refs = STRING_LIST_INIT_NODUP;
432 ref_cb.base_ref = ref;
433 ref_cb.similar_refs = &similar_refs;
434 for_each_ref(append_similar_ref, &ref_cb);
435 return similar_refs;
438 void help_unknown_ref(const char *ref, const char *cmd, const char *error)
440 int i;
441 struct string_list suggested_refs = guess_refs(ref);
443 fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);
445 if (suggested_refs.nr > 0) {
446 fprintf_ln(stderr,
447 Q_("\nDid you mean this?",
448 "\nDid you mean one of these?",
449 suggested_refs.nr));
450 for (i = 0; i < suggested_refs.nr; i++)
451 fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);
454 string_list_clear(&suggested_refs, 0);
455 exit(1);