[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"
#include "version.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[j-1]->name))
			free(cmds->names[i]);
		else
			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) {
			ei++;
			free(cmds->names[ci++]);
		} 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');
	}
}

void list_common_cmds_help(void)
{
	int i, longest = 0;

	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
		if (longest < strlen(common_cmds[i].name))
			longest = strlen(common_cmds[i].name);
	}

	puts(_("The most commonly used git commands are:"));
	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
		printf("   %s   ", common_cmds[i].name);
		mput_char(' ', longest - strlen(common_cmds[i].name));
		puts(_(common_cmds[i].help));
	}
}

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, 3) + 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)
{
	/*
	 * The format of this string should be kept stable for compatibility
	 * with external projects that rely on the output of "git version".
	 */
	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"
816fb46b	9	#include "version.h"
64949984	10
940208a7	11	void add_cmdname(struct cmdnames cmds, const char name, int len)
70827b15	12	{
940208a7	13	struct cmdname ent = xmalloc(sizeof(ent) + len + 1);
1eb05690	14
70827b15 LT	15	ent->len = len;
	16	memcpy(ent->name, name, len);
	17	ent->name[len] = 0;
1eb05690 SP	18
	19	ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
	20	cmds->names[cmds->cnt++] = ent;
70827b15 LT	21	}
70827b15 LT	22
8af84dad JS	23	static void clean_cmdnames(struct cmdnames *cmds)
	24	{
	25	int i;
	26	for (i = 0; i < cmds->cnt; ++i)
	27	free(cmds->names[i]);
	28	free(cmds->names);
	29	cmds->cnt = 0;
	30	cmds->alloc = 0;
	31	}
	32
70827b15 LT	33	static int cmdname_compare(const void a_, const void b_)
	34	{
	35	struct cmdname a = (struct cmdname **)a_;
	36	struct cmdname b = (struct cmdname **)b_;
	37	return strcmp(a->name, b->name);
	38	}
	39
1eb05690 SP	40	static void uniq(struct cmdnames *cmds)
	41	{
	42	int i, j;
	43
	44	if (!cmds->cnt)
	45	return;
	46
4a15758f JK	47	for (i = j = 1; i < cmds->cnt; i++) {
	48	if (!strcmp(cmds->names[i]->name, cmds->names[j-1]->name))
	49	free(cmds->names[i]);
	50	else
1eb05690	51	cmds->names[j++] = cmds->names[i];
4a15758f	52	}
1eb05690 SP	53
	54	cmds->cnt = j;
	55	}
	56
940208a7	57	void exclude_cmds(struct cmdnames cmds, struct cmdnames excludes)
f3fa1838	58	{
1eb05690 SP	59	int ci, cj, ei;
	60	int cmp;
	61
	62	ci = cj = ei = 0;
	63	while (ci < cmds->cnt && ei < excludes->cnt) {
	64	cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
	65	if (cmp < 0)
	66	cmds->names[cj++] = cmds->names[ci++];
6a17f583 JH	67	else if (cmp == 0) {
	68	ei++;
	69	free(cmds->names[ci++]);
	70	} else if (cmp > 0)
1eb05690 SP	71	ei++;
	72	}
	73
	74	while (ci < cmds->cnt)
	75	cmds->names[cj++] = cmds->names[ci++];
	76
	77	cmds->cnt = cj;
	78	}
	79
dbfae689 NTND	80	static void pretty_print_string_list(struct cmdnames *cmds,
dbfae689 NTND	81	unsigned int colopts)
70827b15	82	{
dbfae689 NTND	83	struct string_list list = STRING_LIST_INIT_NODUP;
	84	struct column_options copts;
	85	int i;
70827b15	86
dbfae689 NTND	87	for (i = 0; i < cmds->cnt; i++)
	88	string_list_append(&list, cmds->names[i]->name);
	89	/*
	90	* always enable column display, we only consult column.*
	91	* about layout strategy and stuff
	92	*/
	93	colopts = (colopts & ~COL_ENABLE_MASK) \| COL_ENABLED;
	94	memset(&copts, 0, sizeof(copts));
	95	copts.indent = " ";
	96	copts.padding = 2;
	97	print_columns(&list, colopts, &copts);
	98	string_list_clear(&list, 0);
70827b15 LT	99	}
70827b15 LT	100
cc3b7a97 JS	101	static int is_executable(const char *name)
	102	{
	103	struct stat st;
	104
	105	if (stat(name, &st) \|\| /* stat, not lstat */
	106	!S_ISREG(st.st_mode))
	107	return 0;
	108
b8a97333 RJ	109	#if defined(WIN32) \|\| defined(__CYGWIN__)
	110	#if defined(__CYGWIN__)
	111	if ((st.st_mode & S_IXUSR) == 0)
	112	#endif
0d30ad71	113	{ /* cannot trust the executable bit, peek into the file instead */
cc3b7a97 JS	114	char buf[3] = { 0 };
	115	int n;
	116	int fd = open(name, O_RDONLY);
	117	st.st_mode &= ~S_IXUSR;
	118	if (fd >= 0) {
	119	n = read(fd, buf, 2);
	120	if (n == 2)
	121	/* DOS executables start with "MZ" */
	122	if (!strcmp(buf, "#!") \|\| !strcmp(buf, "MZ"))
	123	st.st_mode \|= S_IXUSR;
	124	close(fd);
	125	}
0d30ad71	126	}
cc3b7a97 JS	127	#endif
	128	return st.st_mode & S_IXUSR;
	129	}
	130
e321180e	131	static void list_commands_in_dir(struct cmdnames *cmds,
940208a7 MV	132	const char *path,
940208a7 MV	133	const char *prefix)
70827b15	134	{
940208a7	135	int prefix_len;
1eb05690	136	DIR *dir = opendir(path);
70827b15	137	struct dirent *de;
f5d600e2 JS	138	struct strbuf buf = STRBUF_INIT;
f5d600e2 JS	139	int len;
70827b15	140
f5d600e2	141	if (!dir)
e321180e	142	return;
940208a7 MV	143	if (!prefix)
	144	prefix = "git-";
	145	prefix_len = strlen(prefix);
70827b15	146
f5d600e2 JS	147	strbuf_addf(&buf, "%s/", path);
	148	len = buf.len;
	149
70827b15	150	while ((de = readdir(dir)) != NULL) {
70827b15 LT	151	int entlen;
70827b15 LT	152
edb6ddc5	153	if (prefixcmp(de->d_name, prefix))
70827b15	154	continue;
0966003c	155
f5d600e2 JS	156	strbuf_setlen(&buf, len);
	157	strbuf_addstr(&buf, de->d_name);
	158	if (!is_executable(buf.buf))
70827b15 LT	159	continue;
70827b15 LT	160
edb6ddc5	161	entlen = strlen(de->d_name) - prefix_len;
5bb1cda5	162	if (has_extension(de->d_name, ".exe"))
70827b15 LT	163	entlen -= 4;
70827b15 LT	164
1eb05690	165	add_cmdname(cmds, de->d_name + prefix_len, entlen);
70827b15 LT	166	}
70827b15 LT	167	closedir(dir);
f5d600e2	168	strbuf_release(&buf);
1eb05690 SP	169	}
1eb05690 SP	170
e321180e	171	void load_command_list(const char *prefix,
940208a7 MV	172	struct cmdnames *main_cmds,
940208a7 MV	173	struct cmdnames *other_cmds)
1eb05690	174	{
1eb05690	175	const char *env_path = getenv("PATH");
1eb05690 SP	176	const char *exec_path = git_exec_path();
1eb05690 SP	177
1f08e5ce	178	if (exec_path) {
e321180e	179	list_commands_in_dir(main_cmds, exec_path, prefix);
1f08e5ce AR	180	qsort(main_cmds->names, main_cmds->cnt,
	181	sizeof(*main_cmds->names), cmdname_compare);
	182	uniq(main_cmds);
1eb05690 SP	183	}
1eb05690 SP	184
1f08e5ce AR	185	if (env_path) {
	186	char paths, path, *colon;
	187	path = paths = xstrdup(env_path);
	188	while (1) {
	189	if ((colon = strchr(path, PATH_SEP)))
	190	*colon = 0;
746c221a PB	191	if (!exec_path \|\| strcmp(path, exec_path))
746c221a PB	192	list_commands_in_dir(other_cmds, path, prefix);
1eb05690	193
1f08e5ce AR	194	if (!colon)
	195	break;
	196	path = colon + 1;
	197	}
	198	free(paths);
1eb05690	199
1f08e5ce AR	200	qsort(other_cmds->names, other_cmds->cnt,
	201	sizeof(*other_cmds->names), cmdname_compare);
	202	uniq(other_cmds);
	203	}
940208a7	204	exclude_cmds(other_cmds, main_cmds);
2156435f JK	205	}
2156435f JK	206
f4ed0af6	207	void list_commands(unsigned int colopts,
dbfae689	208	struct cmdnames main_cmds, struct cmdnames other_cmds)
2156435f	209	{
940208a7	210	if (main_cmds->cnt) {
61c5d431	211	const char *exec_path = git_exec_path();
4470ef94	212	printf_ln(_("available git commands in '%s'"), exec_path);
1eb05690	213	putchar('\n');
dbfae689	214	pretty_print_string_list(main_cmds, colopts);
1eb05690 SP	215	putchar('\n');
	216	}
	217
940208a7	218	if (other_cmds->cnt) {
4470ef94	219	printf_ln(_("git commands available from elsewhere on your $PATH"));
940208a7	220	putchar('\n');
dbfae689	221	pretty_print_string_list(other_cmds, colopts);
1eb05690 SP	222	putchar('\n');
1eb05690 SP	223	}
70827b15 LT	224	}
70827b15 LT	225
1542d4cd JH	226	void list_common_cmds_help(void)
	227	{
	228	int i, longest = 0;
	229
	230	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
	231	if (longest < strlen(common_cmds[i].name))
	232	longest = strlen(common_cmds[i].name);
	233	}
	234
	235	puts(_("The most commonly used git commands are:"));
	236	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
	237	printf(" %s ", common_cmds[i].name);
	238	mput_char(' ', longest - strlen(common_cmds[i].name));
	239	puts(_(common_cmds[i].help));
	240	}
	241	}
	242
940208a7	243	int is_in_cmdlist(struct cmdnames c, const char s)
2156435f JK	244	{
	245	int i;
	246	for (i = 0; i < c->cnt; i++)
	247	if (!strcmp(s, c->names[i]->name))
	248	return 1;
	249	return 0;
	250	}
	251
f0e90716	252	static int autocorrect;
746c221a	253	static struct cmdnames aliases;
f0e90716 AR	254
	255	static int git_unknown_cmd_config(const char var, const char value, void *cb)
	256	{
	257	if (!strcmp(var, "help.autocorrect"))
	258	autocorrect = git_config_int(var,value);
746c221a PB	259	/* Also use aliases for command lookup */
	260	if (!prefixcmp(var, "alias."))
	261	add_cmdname(&aliases, var + 6, strlen(var + 6));
f0e90716 AR	262
	263	return git_default_config(var, value, cb);
	264	}
	265
8af84dad	266	static int levenshtein_compare(const void p1, const void p2)
822a7d50	267	{
8af84dad JS	268	const struct cmdname const c1 = p1, const c2 = p2;
	269	const char s1 = (c1)->name, s2 = (c2)->name;
	270	int l1 = (*c1)->len;
	271	int l2 = (*c2)->len;
	272	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
	273	}
	274
746c221a PB	275	static void add_cmd_list(struct cmdnames cmds, struct cmdnames old)
	276	{
	277	int i;
	278	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
	279
	280	for (i = 0; i < old->cnt; i++)
	281	cmds->names[cmds->cnt++] = old->names[i];
	282	free(old->names);
	283	old->cnt = 0;
	284	old->names = NULL;
	285	}
	286
06500a02	287	/* An empirically derived magic number */
6612b9e4 EFL	288	#define SIMILARITY_FLOOR 7
6612b9e4 EFL	289	#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
06500a02	290
823e0ded MS	291	static const char bad_interpreter_advice[] =
	292	N_("'%s' appears to be a git command, but we were not\n"
	293	"able to execute it. Maybe git-%s is broken?");
	294
8af84dad	295	const char help_unknown_cmd(const char cmd)
822a7d50	296	{
8af84dad JS	297	int i, n, best_similarity = 0;
	298	struct cmdnames main_cmds, other_cmds;
	299
	300	memset(&main_cmds, 0, sizeof(main_cmds));
0b74f5dc	301	memset(&other_cmds, 0, sizeof(other_cmds));
746c221a	302	memset(&aliases, 0, sizeof(aliases));
8af84dad	303
f0e90716 AR	304	git_config(git_unknown_cmd_config, NULL);
f0e90716 AR	305
8af84dad JS	306	load_command_list("git-", &main_cmds, &other_cmds);
8af84dad JS	307
746c221a PB	308	add_cmd_list(&main_cmds, &aliases);
	309	add_cmd_list(&main_cmds, &other_cmds);
	310	qsort(main_cmds.names, main_cmds.cnt,
	311	sizeof(main_cmds.names), cmdname_compare);
	312	uniq(&main_cmds);
8af84dad	313
6612b9e4 EFL	314	/* This abuses cmdname->len for levenshtein distance */
	315	for (i = 0, n = 0; i < main_cmds.cnt; i++) {
	316	int cmp = 0; /* avoid compiler stupidity */
	317	const char *candidate = main_cmds.names[i]->name;
	318
823e0ded MS	319	/*
	320	* An exact match means we have the command, but
	321	* for some reason exec'ing it gave us ENOENT; probably
	322	* it's a bad interpreter in the #! line.
	323	*/
	324	if (!strcmp(candidate, cmd))
	325	die(_(bad_interpreter_advice), cmd, cmd);
	326
6612b9e4 EFL	327	/* Does the candidate appear in common_cmds list? */
	328	while (n < ARRAY_SIZE(common_cmds) &&
	329	(cmp = strcmp(common_cmds[n].name, candidate)) < 0)
	330	n++;
	331	if ((n < ARRAY_SIZE(common_cmds)) && !cmp) {
	332	/* Yes, this is one of the common commands */
	333	n++; /* use the entry from common_cmds[] */
	334	if (!prefixcmp(candidate, cmd)) {
	335	/* Give prefix match a very good score */
	336	main_cmds.names[i]->len = 0;
	337	continue;
	338	}
	339	}
	340
8af84dad	341	main_cmds.names[i]->len =
c41494f8	342	levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
6612b9e4	343	}
8af84dad JS	344
	345	qsort(main_cmds.names, main_cmds.cnt,
	346	sizeof(*main_cmds.names), levenshtein_compare);
	347
	348	if (!main_cmds.cnt)
9665627d	349	die(_("Uh oh. Your system reports no Git commands at all."));
8af84dad	350
6612b9e4 EFL	351	/* skip and count prefix matches */
	352	for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
	353	; /* still counting */
	354
	355	if (main_cmds.cnt <= n) {
	356	/* prefix matches with everything? that is too ambiguous */
	357	best_similarity = SIMILARITY_FLOOR + 1;
	358	} else {
	359	/* count all the most similar ones */
	360	for (best_similarity = main_cmds.names[n++]->len;
	361	(n < main_cmds.cnt &&
	362	best_similarity == main_cmds.names[n]->len);
	363	n++)
	364	; /* still counting */
	365	}
06500a02	366	if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
8af84dad JS	367	const char *assumed = main_cmds.names[0]->name;
	368	main_cmds.names[0] = NULL;
	369	clean_cmdnames(&main_cmds);
9665627d NTND	370	fprintf_ln(stderr,
	371	_("WARNING: You called a Git command named '%s', "
	372	"which does not exist.\n"
	373	"Continuing under the assumption that you meant '%s'"),
8af84dad	374	cmd, assumed);
f0e90716	375	if (autocorrect > 0) {
9665627d	376	fprintf_ln(stderr, _("in %0.1f seconds automatically..."),
f0e90716 AR	377	(float)autocorrect/10.0);
	378	poll(NULL, 0, autocorrect * 100);
	379	}
8af84dad JS	380	return assumed;
	381	}
	382
9665627d	383	fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
8af84dad	384
06500a02	385	if (SIMILAR_ENOUGH(best_similarity)) {
9665627d NTND	386	fprintf_ln(stderr,
	387	Q_("\nDid you mean this?",
	388	"\nDid you mean one of these?",
	389	n));
8af84dad JS	390
	391	for (i = 0; i < n; i++)
	392	fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
	393	}
	394
822a7d50 RJ	395	exit(1);
	396	}
	397
a633fca0	398	int cmd_version(int argc, const char *argv, const char prefix)
70827b15	399	{
f2de0b97 DA	400	/*
	401	* The format of this string should be kept stable for compatibility
	402	* with external projects that rely on the output of "git version".
	403	*/
70827b15 LT	404	printf("git version %s\n", git_version_string);
	405	return 0;
	406	}