[thirdparty/git.git] / help.c

#include "cache.h"
#include "builtin.h"
#include "exec_cmd.h"
#include "levenshtein.h"
#include "help.h"
#include "common-cmds.h"
#include "string-list.h"
#include "column.h"

void add_cmdname(struct cmdnames *cmds, const char *name, int len)
{
	struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1);

	ent->len = len;
	memcpy(ent->name, name, len);
	ent->name[len] = 0;

	ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
	cmds->names[cmds->cnt++] = ent;
}

static void clean_cmdnames(struct cmdnames *cmds)
{
	int i;
	for (i = 0; i < cmds->cnt; ++i)
		free(cmds->names[i]);
	free(cmds->names);
	cmds->cnt = 0;
	cmds->alloc = 0;
}

static int cmdname_compare(const void *a_, const void *b_)
{
	struct cmdname *a = *(struct cmdname **)a_;
	struct cmdname *b = *(struct cmdname **)b_;
	return strcmp(a->name, b->name);
}

static void uniq(struct cmdnames *cmds)
{
	int i, j;

	if (!cmds->cnt)
		return;

	for (i = j = 1; i < cmds->cnt; i++)
		if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
			cmds->names[j++] = cmds->names[i];

	cmds->cnt = j;
}

void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
{
	int ci, cj, ei;
	int cmp;

	ci = cj = ei = 0;
	while (ci < cmds->cnt && ei < excludes->cnt) {
		cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
		if (cmp < 0)
			cmds->names[cj++] = cmds->names[ci++];
		else if (cmp == 0)
			ci++, ei++;
		else if (cmp > 0)
			ei++;
	}

	while (ci < cmds->cnt)
		cmds->names[cj++] = cmds->names[ci++];

	cmds->cnt = cj;
}

static void pretty_print_string_list(struct cmdnames *cmds,
				     unsigned int colopts)
{
	struct string_list list = STRING_LIST_INIT_NODUP;
	struct column_options copts;
	int i;

	for (i = 0; i < cmds->cnt; i++)
		string_list_append(&list, cmds->names[i]->name);
	/*
	 * always enable column display, we only consult column.*
	 * about layout strategy and stuff
	 */
	colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
	memset(&copts, 0, sizeof(copts));
	copts.indent = "  ";
	copts.padding = 2;
	print_columns(&list, colopts, &copts);
	string_list_clear(&list, 0);
}

static int is_executable(const char *name)
{
	struct stat st;

	if (stat(name, &st) || /* stat, not lstat */
	    !S_ISREG(st.st_mode))
		return 0;

#if defined(WIN32) || defined(__CYGWIN__)
#if defined(__CYGWIN__)
if ((st.st_mode & S_IXUSR) == 0)
#endif
{	/* cannot trust the executable bit, peek into the file instead */
	char buf[3] = { 0 };
	int n;
	int fd = open(name, O_RDONLY);
	st.st_mode &= ~S_IXUSR;
	if (fd >= 0) {
		n = read(fd, buf, 2);
		if (n == 2)
			/* DOS executables start with "MZ" */
			if (!strcmp(buf, "#!") || !strcmp(buf, "MZ"))
				st.st_mode |= S_IXUSR;
		close(fd);
	}
}
#endif
	return st.st_mode & S_IXUSR;
}

static void list_commands_in_dir(struct cmdnames *cmds,
					 const char *path,
					 const char *prefix)
{
	int prefix_len;
	DIR *dir = opendir(path);
	struct dirent *de;
	struct strbuf buf = STRBUF_INIT;
	int len;

	if (!dir)
		return;
	if (!prefix)
		prefix = "git-";
	prefix_len = strlen(prefix);

	strbuf_addf(&buf, "%s/", path);
	len = buf.len;

	while ((de = readdir(dir)) != NULL) {
		int entlen;

		if (prefixcmp(de->d_name, prefix))
			continue;

		strbuf_setlen(&buf, len);
		strbuf_addstr(&buf, de->d_name);
		if (!is_executable(buf.buf))
			continue;

		entlen = strlen(de->d_name) - prefix_len;
		if (has_extension(de->d_name, ".exe"))
			entlen -= 4;

		add_cmdname(cmds, de->d_name + prefix_len, entlen);
	}
	closedir(dir);
	strbuf_release(&buf);
}

void load_command_list(const char *prefix,
		struct cmdnames *main_cmds,
		struct cmdnames *other_cmds)
{
	const char *env_path = getenv("PATH");
	const char *exec_path = git_exec_path();

	if (exec_path) {
		list_commands_in_dir(main_cmds, exec_path, prefix);
		qsort(main_cmds->names, main_cmds->cnt,
		      sizeof(*main_cmds->names), cmdname_compare);
		uniq(main_cmds);
	}

	if (env_path) {
		char *paths, *path, *colon;
		path = paths = xstrdup(env_path);
		while (1) {
			if ((colon = strchr(path, PATH_SEP)))
				*colon = 0;
			if (!exec_path || strcmp(path, exec_path))
				list_commands_in_dir(other_cmds, path, prefix);

			if (!colon)
				break;
			path = colon + 1;
		}
		free(paths);

		qsort(other_cmds->names, other_cmds->cnt,
		      sizeof(*other_cmds->names), cmdname_compare);
		uniq(other_cmds);
	}
	exclude_cmds(other_cmds, main_cmds);
}

void list_commands(unsigned int colopts,
		   struct cmdnames *main_cmds, struct cmdnames *other_cmds)
{
	if (main_cmds->cnt) {
		const char *exec_path = git_exec_path();
		printf_ln(_("available git commands in '%s'"), exec_path);
		putchar('\n');
		pretty_print_string_list(main_cmds, colopts);
		putchar('\n');
	}

	if (other_cmds->cnt) {
		printf_ln(_("git commands available from elsewhere on your $PATH"));
		putchar('\n');
		pretty_print_string_list(other_cmds, colopts);
		putchar('\n');
	}
}

int is_in_cmdlist(struct cmdnames *c, const char *s)
{
	int i;
	for (i = 0; i < c->cnt; i++)
		if (!strcmp(s, c->names[i]->name))
			return 1;
	return 0;
}

static int autocorrect;
static struct cmdnames aliases;

static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "help.autocorrect"))
		autocorrect = git_config_int(var,value);
	/* Also use aliases for command lookup */
	if (!prefixcmp(var, "alias."))
		add_cmdname(&aliases, var + 6, strlen(var + 6));

	return git_default_config(var, value, cb);
}

static int levenshtein_compare(const void *p1, const void *p2)
{
	const struct cmdname *const *c1 = p1, *const *c2 = p2;
	const char *s1 = (*c1)->name, *s2 = (*c2)->name;
	int l1 = (*c1)->len;
	int l2 = (*c2)->len;
	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
}

static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
{
	int i;
	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);

	for (i = 0; i < old->cnt; i++)
		cmds->names[cmds->cnt++] = old->names[i];
	free(old->names);
	old->cnt = 0;
	old->names = NULL;
}

/* An empirically derived magic number */
#define SIMILARITY_FLOOR 7
#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)

static const char bad_interpreter_advice[] =
	N_("'%s' appears to be a git command, but we were not\n"
	"able to execute it. Maybe git-%s is broken?");

const char *help_unknown_cmd(const char *cmd)
{
	int i, n, best_similarity = 0;
	struct cmdnames main_cmds, other_cmds;

	memset(&main_cmds, 0, sizeof(main_cmds));
	memset(&other_cmds, 0, sizeof(other_cmds));
	memset(&aliases, 0, sizeof(aliases));

	git_config(git_unknown_cmd_config, NULL);

	load_command_list("git-", &main_cmds, &other_cmds);

	add_cmd_list(&main_cmds, &aliases);
	add_cmd_list(&main_cmds, &other_cmds);
	qsort(main_cmds.names, main_cmds.cnt,
	      sizeof(main_cmds.names), cmdname_compare);
	uniq(&main_cmds);

	/* This abuses cmdname->len for levenshtein distance */
	for (i = 0, n = 0; i < main_cmds.cnt; i++) {
		int cmp = 0; /* avoid compiler stupidity */
		const char *candidate = main_cmds.names[i]->name;

		/*
		 * An exact match means we have the command, but
		 * for some reason exec'ing it gave us ENOENT; probably
		 * it's a bad interpreter in the #! line.
		 */
		if (!strcmp(candidate, cmd))
			die(_(bad_interpreter_advice), cmd, cmd);

		/* Does the candidate appear in common_cmds list? */
		while (n < ARRAY_SIZE(common_cmds) &&
		       (cmp = strcmp(common_cmds[n].name, candidate)) < 0)
			n++;
		if ((n < ARRAY_SIZE(common_cmds)) && !cmp) {
			/* Yes, this is one of the common commands */
			n++; /* use the entry from common_cmds[] */
			if (!prefixcmp(candidate, cmd)) {
				/* Give prefix match a very good score */
				main_cmds.names[i]->len = 0;
				continue;
			}
		}

		main_cmds.names[i]->len =
			levenshtein(cmd, candidate, 0, 2, 1, 4) + 1;
	}

	qsort(main_cmds.names, main_cmds.cnt,
	      sizeof(*main_cmds.names), levenshtein_compare);

	if (!main_cmds.cnt)
		die(_("Uh oh. Your system reports no Git commands at all."));

	/* skip and count prefix matches */
	for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
		; /* still counting */

	if (main_cmds.cnt <= n) {
		/* prefix matches with everything? that is too ambiguous */
		best_similarity = SIMILARITY_FLOOR + 1;
	} else {
		/* count all the most similar ones */
		for (best_similarity = main_cmds.names[n++]->len;
		     (n < main_cmds.cnt &&
		      best_similarity == main_cmds.names[n]->len);
		     n++)
			; /* still counting */
	}
	if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
		const char *assumed = main_cmds.names[0]->name;
		main_cmds.names[0] = NULL;
		clean_cmdnames(&main_cmds);
		fprintf_ln(stderr,
			   _("WARNING: You called a Git command named '%s', "
			     "which does not exist.\n"
			     "Continuing under the assumption that you meant '%s'"),
			cmd, assumed);
		if (autocorrect > 0) {
			fprintf_ln(stderr, _("in %0.1f seconds automatically..."),
				(float)autocorrect/10.0);
			poll(NULL, 0, autocorrect * 100);
		}
		return assumed;
	}

	fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);

	if (SIMILAR_ENOUGH(best_similarity)) {
		fprintf_ln(stderr,
			   Q_("\nDid you mean this?",
			      "\nDid you mean one of these?",
			   n));

		for (i = 0; i < n; i++)
			fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
	}

	exit(1);
}

int cmd_version(int argc, const char **argv, const char *prefix)
{
	printf("git version %s\n", git_version_string);
	return 0;
}
Commit	Line	Data
70827b15 LT	1	#include "cache.h"
	2	#include "builtin.h"
	3	#include "exec_cmd.h"
8af84dad	4	#include "levenshtein.h"
940208a7	5	#include "help.h"
6612b9e4	6	#include "common-cmds.h"
dbfae689 NTND	7	#include "string-list.h"
dbfae689 NTND	8	#include "column.h"
64949984	9
940208a7	10	void add_cmdname(struct cmdnames cmds, const char name, int len)
70827b15	11	{
940208a7	12	struct cmdname ent = xmalloc(sizeof(ent) + len + 1);
1eb05690	13
70827b15 LT	14	ent->len = len;
	15	memcpy(ent->name, name, len);
	16	ent->name[len] = 0;
1eb05690 SP	17
	18	ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
	19	cmds->names[cmds->cnt++] = ent;
70827b15 LT	20	}
70827b15 LT	21
8af84dad JS	22	static void clean_cmdnames(struct cmdnames *cmds)
	23	{
	24	int i;
	25	for (i = 0; i < cmds->cnt; ++i)
	26	free(cmds->names[i]);
	27	free(cmds->names);
	28	cmds->cnt = 0;
	29	cmds->alloc = 0;
	30	}
	31
70827b15 LT	32	static int cmdname_compare(const void a_, const void b_)
	33	{
	34	struct cmdname a = (struct cmdname **)a_;
	35	struct cmdname b = (struct cmdname **)b_;
	36	return strcmp(a->name, b->name);
	37	}
	38
1eb05690 SP	39	static void uniq(struct cmdnames *cmds)
	40	{
	41	int i, j;
	42
	43	if (!cmds->cnt)
	44	return;
	45
	46	for (i = j = 1; i < cmds->cnt; i++)
	47	if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
	48	cmds->names[j++] = cmds->names[i];
	49
	50	cmds->cnt = j;
	51	}
	52
940208a7	53	void exclude_cmds(struct cmdnames cmds, struct cmdnames excludes)
f3fa1838	54	{
1eb05690 SP	55	int ci, cj, ei;
	56	int cmp;
	57
	58	ci = cj = ei = 0;
	59	while (ci < cmds->cnt && ei < excludes->cnt) {
	60	cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
	61	if (cmp < 0)
	62	cmds->names[cj++] = cmds->names[ci++];
	63	else if (cmp == 0)
	64	ci++, ei++;
	65	else if (cmp > 0)
	66	ei++;
	67	}
	68
	69	while (ci < cmds->cnt)
	70	cmds->names[cj++] = cmds->names[ci++];
	71
	72	cmds->cnt = cj;
	73	}
	74
dbfae689 NTND	75	static void pretty_print_string_list(struct cmdnames *cmds,
dbfae689 NTND	76	unsigned int colopts)
70827b15	77	{
dbfae689 NTND	78	struct string_list list = STRING_LIST_INIT_NODUP;
	79	struct column_options copts;
	80	int i;
70827b15	81
dbfae689 NTND	82	for (i = 0; i < cmds->cnt; i++)
	83	string_list_append(&list, cmds->names[i]->name);
	84	/*
	85	* always enable column display, we only consult column.*
	86	* about layout strategy and stuff
	87	*/
	88	colopts = (colopts & ~COL_ENABLE_MASK) \| COL_ENABLED;
	89	memset(&copts, 0, sizeof(copts));
	90	copts.indent = " ";
	91	copts.padding = 2;
	92	print_columns(&list, colopts, &copts);
	93	string_list_clear(&list, 0);
70827b15 LT	94	}
70827b15 LT	95
cc3b7a97 JS	96	static int is_executable(const char *name)
	97	{
	98	struct stat st;
	99
	100	if (stat(name, &st) \|\| /* stat, not lstat */
	101	!S_ISREG(st.st_mode))
	102	return 0;
	103
b8a97333 RJ	104	#if defined(WIN32) \|\| defined(__CYGWIN__)
	105	#if defined(__CYGWIN__)
	106	if ((st.st_mode & S_IXUSR) == 0)
	107	#endif
0d30ad71	108	{ /* cannot trust the executable bit, peek into the file instead */
cc3b7a97 JS	109	char buf[3] = { 0 };
	110	int n;
	111	int fd = open(name, O_RDONLY);
	112	st.st_mode &= ~S_IXUSR;
	113	if (fd >= 0) {
	114	n = read(fd, buf, 2);
	115	if (n == 2)
	116	/* DOS executables start with "MZ" */
	117	if (!strcmp(buf, "#!") \|\| !strcmp(buf, "MZ"))
	118	st.st_mode \|= S_IXUSR;
	119	close(fd);
	120	}
0d30ad71	121	}
cc3b7a97 JS	122	#endif
	123	return st.st_mode & S_IXUSR;
	124	}
	125
e321180e	126	static void list_commands_in_dir(struct cmdnames *cmds,
940208a7 MV	127	const char *path,
940208a7 MV	128	const char *prefix)
70827b15	129	{
940208a7	130	int prefix_len;
1eb05690	131	DIR *dir = opendir(path);
70827b15	132	struct dirent *de;
f5d600e2 JS	133	struct strbuf buf = STRBUF_INIT;
f5d600e2 JS	134	int len;
70827b15	135
f5d600e2	136	if (!dir)
e321180e	137	return;
940208a7 MV	138	if (!prefix)
	139	prefix = "git-";
	140	prefix_len = strlen(prefix);
70827b15	141
f5d600e2 JS	142	strbuf_addf(&buf, "%s/", path);
	143	len = buf.len;
	144
70827b15	145	while ((de = readdir(dir)) != NULL) {
70827b15 LT	146	int entlen;
70827b15 LT	147
edb6ddc5	148	if (prefixcmp(de->d_name, prefix))
70827b15	149	continue;
0966003c	150
f5d600e2 JS	151	strbuf_setlen(&buf, len);
	152	strbuf_addstr(&buf, de->d_name);
	153	if (!is_executable(buf.buf))
70827b15 LT	154	continue;
70827b15 LT	155
edb6ddc5	156	entlen = strlen(de->d_name) - prefix_len;
5bb1cda5	157	if (has_extension(de->d_name, ".exe"))
70827b15 LT	158	entlen -= 4;
70827b15 LT	159
1eb05690	160	add_cmdname(cmds, de->d_name + prefix_len, entlen);
70827b15 LT	161	}
70827b15 LT	162	closedir(dir);
f5d600e2	163	strbuf_release(&buf);
1eb05690 SP	164	}
1eb05690 SP	165
e321180e	166	void load_command_list(const char *prefix,
940208a7 MV	167	struct cmdnames *main_cmds,
940208a7 MV	168	struct cmdnames *other_cmds)
1eb05690	169	{
1eb05690	170	const char *env_path = getenv("PATH");
1eb05690 SP	171	const char *exec_path = git_exec_path();
1eb05690 SP	172
1f08e5ce	173	if (exec_path) {
e321180e	174	list_commands_in_dir(main_cmds, exec_path, prefix);
1f08e5ce AR	175	qsort(main_cmds->names, main_cmds->cnt,
	176	sizeof(*main_cmds->names), cmdname_compare);
	177	uniq(main_cmds);
1eb05690 SP	178	}
1eb05690 SP	179
1f08e5ce AR	180	if (env_path) {
	181	char paths, path, *colon;
	182	path = paths = xstrdup(env_path);
	183	while (1) {
	184	if ((colon = strchr(path, PATH_SEP)))
	185	*colon = 0;
746c221a PB	186	if (!exec_path \|\| strcmp(path, exec_path))
746c221a PB	187	list_commands_in_dir(other_cmds, path, prefix);
1eb05690	188
1f08e5ce AR	189	if (!colon)
	190	break;
	191	path = colon + 1;
	192	}
	193	free(paths);
1eb05690	194
1f08e5ce AR	195	qsort(other_cmds->names, other_cmds->cnt,
	196	sizeof(*other_cmds->names), cmdname_compare);
	197	uniq(other_cmds);
	198	}
940208a7	199	exclude_cmds(other_cmds, main_cmds);
2156435f JK	200	}
2156435f JK	201
f4ed0af6	202	void list_commands(unsigned int colopts,
dbfae689	203	struct cmdnames main_cmds, struct cmdnames other_cmds)
2156435f	204	{
940208a7	205	if (main_cmds->cnt) {
61c5d431	206	const char *exec_path = git_exec_path();
4470ef94	207	printf_ln(_("available git commands in '%s'"), exec_path);
1eb05690	208	putchar('\n');
dbfae689	209	pretty_print_string_list(main_cmds, colopts);
1eb05690 SP	210	putchar('\n');
	211	}
	212
940208a7	213	if (other_cmds->cnt) {
4470ef94	214	printf_ln(_("git commands available from elsewhere on your $PATH"));
940208a7	215	putchar('\n');
dbfae689	216	pretty_print_string_list(other_cmds, colopts);
1eb05690 SP	217	putchar('\n');
1eb05690 SP	218	}
70827b15 LT	219	}
70827b15 LT	220
940208a7	221	int is_in_cmdlist(struct cmdnames c, const char s)
2156435f JK	222	{
	223	int i;
	224	for (i = 0; i < c->cnt; i++)
	225	if (!strcmp(s, c->names[i]->name))
	226	return 1;
	227	return 0;
	228	}
	229
f0e90716	230	static int autocorrect;
746c221a	231	static struct cmdnames aliases;
f0e90716 AR	232
	233	static int git_unknown_cmd_config(const char var, const char value, void *cb)
	234	{
	235	if (!strcmp(var, "help.autocorrect"))
	236	autocorrect = git_config_int(var,value);
746c221a PB	237	/* Also use aliases for command lookup */
	238	if (!prefixcmp(var, "alias."))
	239	add_cmdname(&aliases, var + 6, strlen(var + 6));
f0e90716 AR	240
	241	return git_default_config(var, value, cb);
	242	}
	243
8af84dad	244	static int levenshtein_compare(const void p1, const void p2)
822a7d50	245	{
8af84dad JS	246	const struct cmdname const c1 = p1, const c2 = p2;
	247	const char s1 = (c1)->name, s2 = (c2)->name;
	248	int l1 = (*c1)->len;
	249	int l2 = (*c2)->len;
	250	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
	251	}
	252
746c221a PB	253	static void add_cmd_list(struct cmdnames cmds, struct cmdnames old)
	254	{
	255	int i;
	256	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
	257
	258	for (i = 0; i < old->cnt; i++)
	259	cmds->names[cmds->cnt++] = old->names[i];
	260	free(old->names);
	261	old->cnt = 0;
	262	old->names = NULL;
	263	}
	264
06500a02	265	/* An empirically derived magic number */
6612b9e4 EFL	266	#define SIMILARITY_FLOOR 7
6612b9e4 EFL	267	#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
06500a02	268
823e0ded MS	269	static const char bad_interpreter_advice[] =
	270	N_("'%s' appears to be a git command, but we were not\n"
	271	"able to execute it. Maybe git-%s is broken?");
	272
8af84dad	273	const char help_unknown_cmd(const char cmd)
822a7d50	274	{
8af84dad JS	275	int i, n, best_similarity = 0;
	276	struct cmdnames main_cmds, other_cmds;
	277
	278	memset(&main_cmds, 0, sizeof(main_cmds));
0b74f5dc	279	memset(&other_cmds, 0, sizeof(other_cmds));
746c221a	280	memset(&aliases, 0, sizeof(aliases));
8af84dad	281
f0e90716 AR	282	git_config(git_unknown_cmd_config, NULL);
f0e90716 AR	283
8af84dad JS	284	load_command_list("git-", &main_cmds, &other_cmds);
8af84dad JS	285
746c221a PB	286	add_cmd_list(&main_cmds, &aliases);
	287	add_cmd_list(&main_cmds, &other_cmds);
	288	qsort(main_cmds.names, main_cmds.cnt,
	289	sizeof(main_cmds.names), cmdname_compare);
	290	uniq(&main_cmds);
8af84dad	291
6612b9e4 EFL	292	/* This abuses cmdname->len for levenshtein distance */
	293	for (i = 0, n = 0; i < main_cmds.cnt; i++) {
	294	int cmp = 0; /* avoid compiler stupidity */
	295	const char *candidate = main_cmds.names[i]->name;
	296
823e0ded MS	297	/*
	298	* An exact match means we have the command, but
	299	* for some reason exec'ing it gave us ENOENT; probably
	300	* it's a bad interpreter in the #! line.
	301	*/
	302	if (!strcmp(candidate, cmd))
	303	die(_(bad_interpreter_advice), cmd, cmd);
	304
6612b9e4 EFL	305	/* Does the candidate appear in common_cmds list? */
	306	while (n < ARRAY_SIZE(common_cmds) &&
	307	(cmp = strcmp(common_cmds[n].name, candidate)) < 0)
	308	n++;
	309	if ((n < ARRAY_SIZE(common_cmds)) && !cmp) {
	310	/* Yes, this is one of the common commands */
	311	n++; /* use the entry from common_cmds[] */
	312	if (!prefixcmp(candidate, cmd)) {
	313	/* Give prefix match a very good score */
	314	main_cmds.names[i]->len = 0;
	315	continue;
	316	}
	317	}
	318
8af84dad	319	main_cmds.names[i]->len =
6612b9e4 EFL	320	levenshtein(cmd, candidate, 0, 2, 1, 4) + 1;
6612b9e4 EFL	321	}
8af84dad JS	322
	323	qsort(main_cmds.names, main_cmds.cnt,
	324	sizeof(*main_cmds.names), levenshtein_compare);
	325
	326	if (!main_cmds.cnt)
9665627d	327	die(_("Uh oh. Your system reports no Git commands at all."));
8af84dad	328
6612b9e4 EFL	329	/* skip and count prefix matches */
	330	for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
	331	; /* still counting */
	332
	333	if (main_cmds.cnt <= n) {
	334	/* prefix matches with everything? that is too ambiguous */
	335	best_similarity = SIMILARITY_FLOOR + 1;
	336	} else {
	337	/* count all the most similar ones */
	338	for (best_similarity = main_cmds.names[n++]->len;
	339	(n < main_cmds.cnt &&
	340	best_similarity == main_cmds.names[n]->len);
	341	n++)
	342	; /* still counting */
	343	}
06500a02	344	if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
8af84dad JS	345	const char *assumed = main_cmds.names[0]->name;
	346	main_cmds.names[0] = NULL;
	347	clean_cmdnames(&main_cmds);
9665627d NTND	348	fprintf_ln(stderr,
	349	_("WARNING: You called a Git command named '%s', "
	350	"which does not exist.\n"
	351	"Continuing under the assumption that you meant '%s'"),
8af84dad	352	cmd, assumed);
f0e90716	353	if (autocorrect > 0) {
9665627d	354	fprintf_ln(stderr, _("in %0.1f seconds automatically..."),
f0e90716 AR	355	(float)autocorrect/10.0);
	356	poll(NULL, 0, autocorrect * 100);
	357	}
8af84dad JS	358	return assumed;
	359	}
	360
9665627d	361	fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
8af84dad	362
06500a02	363	if (SIMILAR_ENOUGH(best_similarity)) {
9665627d NTND	364	fprintf_ln(stderr,
	365	Q_("\nDid you mean this?",
	366	"\nDid you mean one of these?",
	367	n));
8af84dad JS	368
	369	for (i = 0; i < n; i++)
	370	fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
	371	}
	372
822a7d50 RJ	373	exit(1);
	374	}
	375
a633fca0	376	int cmd_version(int argc, const char *argv, const char prefix)
70827b15 LT	377	{
	378	printf("git version %s\n", git_version_string);
	379	return 0;
	380	}