[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"

/* most GUI terminals set COLUMNS (although some don't export it) */
static int term_columns(void)
{
	char *col_string = getenv("COLUMNS");
	int n_cols;

	if (col_string && (n_cols = atoi(col_string)) > 0)
		return n_cols;

#ifdef TIOCGWINSZ
	{
		struct winsize ws;
		if (!ioctl(1, TIOCGWINSZ, &ws)) {
			if (ws.ws_col)
				return ws.ws_col;
		}
	}
#endif

	return 80;
}

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, int longest)
{
	int cols = 1, rows;
	int space = longest + 1; /* min 1 SP between words */
	int max_cols = term_columns() - 1; /* don't print *on* the edge */
	int i, j;

	if (space < max_cols)
		cols = max_cols / space;
	rows = DIV_ROUND_UP(cmds->cnt, cols);

	for (i = 0; i < rows; i++) {
		printf("  ");

		for (j = 0; j < cols; j++) {
			int n = j * rows + i;
			int size = space;
			if (n >= cmds->cnt)
				break;
			if (j == cols-1 || n + rows >= cmds->cnt)
				size = 1;
			printf("%-*s", size, cmds->names[n]->name);
		}
		putchar('\n');
	}
}

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

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

#ifdef WIN32
{	/* 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(const char *title, struct cmdnames *main_cmds,
		   struct cmdnames *other_cmds)
{
	int i, longest = 0;

	for (i = 0; i < main_cmds->cnt; i++)
		if (longest < main_cmds->names[i]->len)
			longest = main_cmds->names[i]->len;
	for (i = 0; i < other_cmds->cnt; i++)
		if (longest < other_cmds->names[i]->len)
			longest = other_cmds->names[i]->len;

	if (main_cmds->cnt) {
		const char *exec_path = git_exec_path();
		printf("available %s in '%s'\n", title, exec_path);
		printf("----------------");
		mput_char('-', strlen(title) + strlen(exec_path));
		putchar('\n');
		pretty_print_string_list(main_cmds, longest);
		putchar('\n');
	}

	if (other_cmds->cnt) {
		printf("%s available from elsewhere on your $PATH\n", title);
		printf("---------------------------------------");
		mput_char('-', strlen(title));
		putchar('\n');
		pretty_print_string_list(other_cmds, longest);
		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)

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;

		/* 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(stderr, "WARNING: You called a Git command named '%s', "
			"which does not exist.\n"
			"Continuing under the assumption that you meant '%s'\n",
			cmd, assumed);
		if (autocorrect > 0) {
			fprintf(stderr, "in %0.1f seconds automatically...\n",
				(float)autocorrect/10.0);
			poll(NULL, 0, autocorrect * 100);
		}
		return assumed;
	}

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

	if (SIMILAR_ENOUGH(best_similarity)) {
		fprintf(stderr, "\nDid you mean %s?\n",
			n < 2 ? "this": "one of these");

		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"
64949984	7
82e5a82f	8	/* most GUI terminals set COLUMNS (although some don't export it) */
70827b15 LT	9	static int term_columns(void)
	10	{
	11	char *col_string = getenv("COLUMNS");
96f1e58f	12	int n_cols;
70827b15 LT	13
	14	if (col_string && (n_cols = atoi(col_string)) > 0)
	15	return n_cols;
	16
	17	#ifdef TIOCGWINSZ
	18	{
	19	struct winsize ws;
	20	if (!ioctl(1, TIOCGWINSZ, &ws)) {
	21	if (ws.ws_col)
	22	return ws.ws_col;
	23	}
	24	}
	25	#endif
	26
	27	return 80;
	28	}
	29
940208a7	30	void add_cmdname(struct cmdnames cmds, const char name, int len)
70827b15	31	{
940208a7	32	struct cmdname ent = xmalloc(sizeof(ent) + len + 1);
1eb05690	33
70827b15 LT	34	ent->len = len;
	35	memcpy(ent->name, name, len);
	36	ent->name[len] = 0;
1eb05690 SP	37
	38	ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
	39	cmds->names[cmds->cnt++] = ent;
70827b15 LT	40	}
70827b15 LT	41
8af84dad JS	42	static void clean_cmdnames(struct cmdnames *cmds)
	43	{
	44	int i;
	45	for (i = 0; i < cmds->cnt; ++i)
	46	free(cmds->names[i]);
	47	free(cmds->names);
	48	cmds->cnt = 0;
	49	cmds->alloc = 0;
	50	}
	51
70827b15 LT	52	static int cmdname_compare(const void a_, const void b_)
	53	{
	54	struct cmdname a = (struct cmdname **)a_;
	55	struct cmdname b = (struct cmdname **)b_;
	56	return strcmp(a->name, b->name);
	57	}
	58
1eb05690 SP	59	static void uniq(struct cmdnames *cmds)
	60	{
	61	int i, j;
	62
	63	if (!cmds->cnt)
	64	return;
	65
	66	for (i = j = 1; i < cmds->cnt; i++)
	67	if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
	68	cmds->names[j++] = cmds->names[i];
	69
	70	cmds->cnt = j;
	71	}
	72
940208a7	73	void exclude_cmds(struct cmdnames cmds, struct cmdnames excludes)
f3fa1838	74	{
1eb05690 SP	75	int ci, cj, ei;
	76	int cmp;
	77
	78	ci = cj = ei = 0;
	79	while (ci < cmds->cnt && ei < excludes->cnt) {
	80	cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
	81	if (cmp < 0)
	82	cmds->names[cj++] = cmds->names[ci++];
	83	else if (cmp == 0)
	84	ci++, ei++;
	85	else if (cmp > 0)
	86	ei++;
	87	}
	88
	89	while (ci < cmds->cnt)
	90	cmds->names[cj++] = cmds->names[ci++];
	91
	92	cmds->cnt = cj;
	93	}
	94
	95	static void pretty_print_string_list(struct cmdnames *cmds, int longest)
70827b15 LT	96	{
	97	int cols = 1, rows;
	98	int space = longest + 1; /* min 1 SP between words */
	99	int max_cols = term_columns() - 1; /* don't print on the edge */
	100	int i, j;
	101
	102	if (space < max_cols)
	103	cols = max_cols / space;
98cb6f30	104	rows = DIV_ROUND_UP(cmds->cnt, cols);
70827b15 LT	105
	106	for (i = 0; i < rows; i++) {
	107	printf(" ");
	108
	109	for (j = 0; j < cols; j++) {
	110	int n = j * rows + i;
	111	int size = space;
1eb05690	112	if (n >= cmds->cnt)
70827b15	113	break;
1eb05690	114	if (j == cols-1 \|\| n + rows >= cmds->cnt)
70827b15	115	size = 1;
1eb05690	116	printf("%-*s", size, cmds->names[n]->name);
70827b15 LT	117	}
	118	putchar('\n');
	119	}
	120	}
	121
cc3b7a97 JS	122	static int is_executable(const char *name)
	123	{
	124	struct stat st;
	125
	126	if (stat(name, &st) \|\| /* stat, not lstat */
	127	!S_ISREG(st.st_mode))
	128	return 0;
	129
71064e3f	130	#ifdef WIN32
0d30ad71	131	{ /* cannot trust the executable bit, peek into the file instead */
cc3b7a97 JS	132	char buf[3] = { 0 };
	133	int n;
	134	int fd = open(name, O_RDONLY);
	135	st.st_mode &= ~S_IXUSR;
	136	if (fd >= 0) {
	137	n = read(fd, buf, 2);
	138	if (n == 2)
	139	/* DOS executables start with "MZ" */
	140	if (!strcmp(buf, "#!") \|\| !strcmp(buf, "MZ"))
	141	st.st_mode \|= S_IXUSR;
	142	close(fd);
	143	}
0d30ad71	144	}
cc3b7a97 JS	145	#endif
	146	return st.st_mode & S_IXUSR;
	147	}
	148
e321180e	149	static void list_commands_in_dir(struct cmdnames *cmds,
940208a7 MV	150	const char *path,
940208a7 MV	151	const char *prefix)
70827b15	152	{
940208a7	153	int prefix_len;
1eb05690	154	DIR *dir = opendir(path);
70827b15	155	struct dirent *de;
f5d600e2 JS	156	struct strbuf buf = STRBUF_INIT;
f5d600e2 JS	157	int len;
70827b15	158
f5d600e2	159	if (!dir)
e321180e	160	return;
940208a7 MV	161	if (!prefix)
	162	prefix = "git-";
	163	prefix_len = strlen(prefix);
70827b15	164
f5d600e2 JS	165	strbuf_addf(&buf, "%s/", path);
	166	len = buf.len;
	167
70827b15	168	while ((de = readdir(dir)) != NULL) {
70827b15 LT	169	int entlen;
70827b15 LT	170
edb6ddc5	171	if (prefixcmp(de->d_name, prefix))
70827b15	172	continue;
0966003c	173
f5d600e2 JS	174	strbuf_setlen(&buf, len);
	175	strbuf_addstr(&buf, de->d_name);
	176	if (!is_executable(buf.buf))
70827b15 LT	177	continue;
70827b15 LT	178
edb6ddc5	179	entlen = strlen(de->d_name) - prefix_len;
5bb1cda5	180	if (has_extension(de->d_name, ".exe"))
70827b15 LT	181	entlen -= 4;
70827b15 LT	182
1eb05690	183	add_cmdname(cmds, de->d_name + prefix_len, entlen);
70827b15 LT	184	}
70827b15 LT	185	closedir(dir);
f5d600e2	186	strbuf_release(&buf);
1eb05690 SP	187	}
1eb05690 SP	188
e321180e	189	void load_command_list(const char *prefix,
940208a7 MV	190	struct cmdnames *main_cmds,
940208a7 MV	191	struct cmdnames *other_cmds)
1eb05690	192	{
1eb05690	193	const char *env_path = getenv("PATH");
1eb05690 SP	194	const char *exec_path = git_exec_path();
1eb05690 SP	195
1f08e5ce	196	if (exec_path) {
e321180e	197	list_commands_in_dir(main_cmds, exec_path, prefix);
1f08e5ce AR	198	qsort(main_cmds->names, main_cmds->cnt,
	199	sizeof(*main_cmds->names), cmdname_compare);
	200	uniq(main_cmds);
1eb05690 SP	201	}
1eb05690 SP	202
1f08e5ce AR	203	if (env_path) {
	204	char paths, path, *colon;
	205	path = paths = xstrdup(env_path);
	206	while (1) {
	207	if ((colon = strchr(path, PATH_SEP)))
	208	*colon = 0;
746c221a PB	209	if (!exec_path \|\| strcmp(path, exec_path))
746c221a PB	210	list_commands_in_dir(other_cmds, path, prefix);
1eb05690	211
1f08e5ce AR	212	if (!colon)
	213	break;
	214	path = colon + 1;
	215	}
	216	free(paths);
1eb05690	217
1f08e5ce AR	218	qsort(other_cmds->names, other_cmds->cnt,
	219	sizeof(*other_cmds->names), cmdname_compare);
	220	uniq(other_cmds);
	221	}
940208a7	222	exclude_cmds(other_cmds, main_cmds);
2156435f JK	223	}
2156435f JK	224
e321180e AR	225	void list_commands(const char title, struct cmdnames main_cmds,
e321180e AR	226	struct cmdnames *other_cmds)
2156435f	227	{
e321180e AR	228	int i, longest = 0;
	229
	230	for (i = 0; i < main_cmds->cnt; i++)
	231	if (longest < main_cmds->names[i]->len)
	232	longest = main_cmds->names[i]->len;
	233	for (i = 0; i < other_cmds->cnt; i++)
	234	if (longest < other_cmds->names[i]->len)
	235	longest = other_cmds->names[i]->len;
2156435f	236
940208a7	237	if (main_cmds->cnt) {
61c5d431	238	const char *exec_path = git_exec_path();
940208a7 MV	239	printf("available %s in '%s'\n", title, exec_path);
	240	printf("----------------");
	241	mput_char('-', strlen(title) + strlen(exec_path));
1eb05690	242	putchar('\n');
940208a7	243	pretty_print_string_list(main_cmds, longest);
1eb05690 SP	244	putchar('\n');
	245	}
	246
940208a7 MV	247	if (other_cmds->cnt) {
	248	printf("%s available from elsewhere on your $PATH\n", title);
	249	printf("---------------------------------------");
	250	mput_char('-', strlen(title));
	251	putchar('\n');
	252	pretty_print_string_list(other_cmds, longest);
1eb05690 SP	253	putchar('\n');
1eb05690 SP	254	}
70827b15 LT	255	}
70827b15 LT	256
940208a7	257	int is_in_cmdlist(struct cmdnames c, const char s)
2156435f JK	258	{
	259	int i;
	260	for (i = 0; i < c->cnt; i++)
	261	if (!strcmp(s, c->names[i]->name))
	262	return 1;
	263	return 0;
	264	}
	265
f0e90716	266	static int autocorrect;
746c221a	267	static struct cmdnames aliases;
f0e90716 AR	268
	269	static int git_unknown_cmd_config(const char var, const char value, void *cb)
	270	{
	271	if (!strcmp(var, "help.autocorrect"))
	272	autocorrect = git_config_int(var,value);
746c221a PB	273	/* Also use aliases for command lookup */
	274	if (!prefixcmp(var, "alias."))
	275	add_cmdname(&aliases, var + 6, strlen(var + 6));
f0e90716 AR	276
	277	return git_default_config(var, value, cb);
	278	}
	279
8af84dad	280	static int levenshtein_compare(const void p1, const void p2)
822a7d50	281	{
8af84dad JS	282	const struct cmdname const c1 = p1, const c2 = p2;
	283	const char s1 = (c1)->name, s2 = (c2)->name;
	284	int l1 = (*c1)->len;
	285	int l2 = (*c2)->len;
	286	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
	287	}
	288
746c221a PB	289	static void add_cmd_list(struct cmdnames cmds, struct cmdnames old)
	290	{
	291	int i;
	292	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
	293
	294	for (i = 0; i < old->cnt; i++)
	295	cmds->names[cmds->cnt++] = old->names[i];
	296	free(old->names);
	297	old->cnt = 0;
	298	old->names = NULL;
	299	}
	300
06500a02	301	/* An empirically derived magic number */
6612b9e4 EFL	302	#define SIMILARITY_FLOOR 7
6612b9e4 EFL	303	#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
06500a02	304
8af84dad	305	const char help_unknown_cmd(const char cmd)
822a7d50	306	{
8af84dad JS	307	int i, n, best_similarity = 0;
	308	struct cmdnames main_cmds, other_cmds;
	309
	310	memset(&main_cmds, 0, sizeof(main_cmds));
0b74f5dc	311	memset(&other_cmds, 0, sizeof(other_cmds));
746c221a	312	memset(&aliases, 0, sizeof(aliases));
8af84dad	313
f0e90716 AR	314	git_config(git_unknown_cmd_config, NULL);
f0e90716 AR	315
8af84dad JS	316	load_command_list("git-", &main_cmds, &other_cmds);
8af84dad JS	317
746c221a PB	318	add_cmd_list(&main_cmds, &aliases);
	319	add_cmd_list(&main_cmds, &other_cmds);
	320	qsort(main_cmds.names, main_cmds.cnt,
	321	sizeof(main_cmds.names), cmdname_compare);
	322	uniq(&main_cmds);
8af84dad	323
6612b9e4 EFL	324	/* This abuses cmdname->len for levenshtein distance */
	325	for (i = 0, n = 0; i < main_cmds.cnt; i++) {
	326	int cmp = 0; /* avoid compiler stupidity */
	327	const char *candidate = main_cmds.names[i]->name;
	328
	329	/* Does the candidate appear in common_cmds list? */
	330	while (n < ARRAY_SIZE(common_cmds) &&
	331	(cmp = strcmp(common_cmds[n].name, candidate)) < 0)
	332	n++;
	333	if ((n < ARRAY_SIZE(common_cmds)) && !cmp) {
	334	/* Yes, this is one of the common commands */
	335	n++; /* use the entry from common_cmds[] */
	336	if (!prefixcmp(candidate, cmd)) {
	337	/* Give prefix match a very good score */
	338	main_cmds.names[i]->len = 0;
	339	continue;
	340	}
	341	}
	342
8af84dad	343	main_cmds.names[i]->len =
6612b9e4 EFL	344	levenshtein(cmd, candidate, 0, 2, 1, 4) + 1;
6612b9e4 EFL	345	}
8af84dad JS	346
	347	qsort(main_cmds.names, main_cmds.cnt,
	348	sizeof(*main_cmds.names), levenshtein_compare);
	349
	350	if (!main_cmds.cnt)
	351	die ("Uh oh. Your system reports no Git commands at all.");
	352
6612b9e4 EFL	353	/* skip and count prefix matches */
	354	for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
	355	; /* still counting */
	356
	357	if (main_cmds.cnt <= n) {
	358	/* prefix matches with everything? that is too ambiguous */
	359	best_similarity = SIMILARITY_FLOOR + 1;
	360	} else {
	361	/* count all the most similar ones */
	362	for (best_similarity = main_cmds.names[n++]->len;
	363	(n < main_cmds.cnt &&
	364	best_similarity == main_cmds.names[n]->len);
	365	n++)
	366	; /* still counting */
	367	}
06500a02	368	if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
8af84dad JS	369	const char *assumed = main_cmds.names[0]->name;
	370	main_cmds.names[0] = NULL;
	371	clean_cmdnames(&main_cmds);
57f6ec02	372	fprintf(stderr, "WARNING: You called a Git command named '%s', "
8af84dad JS	373	"which does not exist.\n"
	374	"Continuing under the assumption that you meant '%s'\n",
	375	cmd, assumed);
f0e90716 AR	376	if (autocorrect > 0) {
	377	fprintf(stderr, "in %0.1f seconds automatically...\n",
	378	(float)autocorrect/10.0);
	379	poll(NULL, 0, autocorrect * 100);
	380	}
8af84dad JS	381	return assumed;
	382	}
	383
7283bbc7	384	fprintf(stderr, "git: '%s' is not a git command. See 'git --help'.\n", cmd);
8af84dad	385
06500a02	386	if (SIMILAR_ENOUGH(best_similarity)) {
8af84dad JS	387	fprintf(stderr, "\nDid you mean %s?\n",
	388	n < 2 ? "this": "one of these");
	389
	390	for (i = 0; i < n; i++)
	391	fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
	392	}
	393
822a7d50 RJ	394	exit(1);
	395	}
	396
a633fca0	397	int cmd_version(int argc, const char *argv, const char prefix)
70827b15 LT	398	{
	399	printf("git version %s\n", git_version_string);
	400	return 0;
	401	}