[thirdparty/git.git] / help.c

#include "cache.h"
#include "config.h"
#include "builtin.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "levenshtein.h"
#include "help.h"
#include "command-list.h"
#include "string-list.h"
#include "column.h"
#include "version.h"
#include "refs.h"
#include "parse-options.h"

struct category_description {
	uint32_t category;
	const char *desc;
};
static uint32_t common_mask =
	CAT_init | CAT_worktree | CAT_info |
	CAT_history | CAT_remote;
static struct category_description common_categories[] = {
	{ CAT_init, N_("start a working area (see also: git help tutorial)") },
	{ CAT_worktree, N_("work on the current change (see also: git help everyday)") },
	{ CAT_info, N_("examine the history and state (see also: git help revisions)") },
	{ CAT_history, N_("grow, mark and tweak your common history") },
	{ CAT_remote, N_("collaborate (see also: git help workflows)") },
	{ 0, NULL }
};

static const char *drop_prefix(const char *name)
{
	const char *new_name;

	if (skip_prefix(name, "git-", &new_name))
		return new_name;
	return name;

}

static void extract_cmds(struct cmdname_help **p_cmds, uint32_t mask)
{
	int i, nr = 0;
	struct cmdname_help *cmds;

	if (ARRAY_SIZE(command_list) == 0)
		BUG("empty command_list[] is a sign of broken generate-cmdlist.sh");

	ALLOC_ARRAY(cmds, ARRAY_SIZE(command_list) + 1);

	for (i = 0; i < ARRAY_SIZE(command_list); i++) {
		const struct cmdname_help *cmd = command_list + i;

		if (!(cmd->category & mask))
			continue;

		cmds[nr] = *cmd;
		cmds[nr].name = drop_prefix(cmd->name);

		nr++;
	}
	cmds[nr].name = NULL;
	*p_cmds = cmds;
}

static void print_command_list(const struct cmdname_help *cmds,
			       uint32_t mask, int longest)
{
	int i;

	for (i = 0; cmds[i].name; i++) {
		if (cmds[i].category & mask) {
			printf("   %s   ", cmds[i].name);
			mput_char(' ', longest - strlen(cmds[i].name));
			puts(_(cmds[i].help));
		}
	}
}

static int cmd_name_cmp(const void *elem1, const void *elem2)
{
	const struct cmdname_help *e1 = elem1;
	const struct cmdname_help *e2 = elem2;

	return strcmp(e1->name, e2->name);
}

static void print_cmd_by_category(const struct category_description *catdesc)
{
	struct cmdname_help *cmds;
	int longest = 0;
	int i, nr = 0;
	uint32_t mask = 0;

	for (i = 0; catdesc[i].desc; i++)
		mask |= catdesc[i].category;

	extract_cmds(&cmds, mask);

	for (i = 0; cmds[i].name; i++, nr++) {
		if (longest < strlen(cmds[i].name))
			longest = strlen(cmds[i].name);
	}
	QSORT(cmds, nr, cmd_name_cmp);

	for (i = 0; catdesc[i].desc; i++) {
		uint32_t mask = catdesc[i].category;
		const char *desc = catdesc[i].desc;

		printf("\n%s\n", _(desc));
		print_command_list(cmds, mask, longest);
	}
	free(cmds);
}

void add_cmdname(struct cmdnames *cmds, const char *name, int len)
{
	struct cmdname *ent;
	FLEX_ALLOC_MEM(ent, name, name, len);
	ent->len = len;

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

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

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

	while ((de = readdir(dir)) != NULL) {
		const char *ent;
		size_t entlen;

		if (!skip_prefix(de->d_name, prefix, &ent))
			continue;

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

		entlen = strlen(ent);
		strip_suffix(ent, ".exe", &entlen);

		add_cmdname(cmds, ent, 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, 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, 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_cmdnames(main_cmds, colopts);
		putchar('\n');
	}

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

void list_common_cmds_help(void)
{
	puts(_("These are common Git commands used in various situations:"));
	print_cmd_by_category(common_categories);
}

void list_all_main_cmds(struct string_list *list)
{
	struct cmdnames main_cmds, other_cmds;
	int i;

	memset(&main_cmds, 0, sizeof(main_cmds));
	memset(&other_cmds, 0, sizeof(other_cmds));
	load_command_list("git-", &main_cmds, &other_cmds);

	for (i = 0; i < main_cmds.cnt; i++)
		string_list_append(list, main_cmds.names[i]->name);

	clean_cmdnames(&main_cmds);
	clean_cmdnames(&other_cmds);
}

void list_all_other_cmds(struct string_list *list)
{
	struct cmdnames main_cmds, other_cmds;
	int i;

	memset(&main_cmds, 0, sizeof(main_cmds));
	memset(&other_cmds, 0, sizeof(other_cmds));
	load_command_list("git-", &main_cmds, &other_cmds);

	for (i = 0; i < other_cmds.cnt; i++)
		string_list_append(list, other_cmds.names[i]->name);

	clean_cmdnames(&main_cmds);
	clean_cmdnames(&other_cmds);
}

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)
{
	const char *p;

	if (!strcmp(var, "help.autocorrect"))
		autocorrect = git_config_int(var,value);
	/* Also use aliases for command lookup */
	if (skip_prefix(var, "alias.", &p))
		add_cmdname(&aliases, p, strlen(p));

	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_AND_NULL(old->names);
	old->cnt = 0;
}

/* 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;
	struct cmdname_help *common_cmds;

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

	read_early_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, cmdname_compare);
	uniq(&main_cmds);

	extract_cmds(&common_cmds, common_mask);

	/* 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 (common_cmds[n].name &&
		       (cmp = strcmp(common_cmds[n].name, candidate)) < 0)
			n++;
		if (common_cmds[n].name && !cmp) {
			/* Yes, this is one of the common commands */
			n++; /* use the entry from common_cmds[] */
			if (starts_with(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;
	}
	FREE_AND_NULL(common_cmds);

	QSORT(main_cmds.names, main_cmds.cnt, 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."),
			   cmd);
		if (autocorrect < 0)
			fprintf_ln(stderr,
				   _("Continuing under the assumption that "
				     "you meant '%s'."),
				   assumed);
		else {
			fprintf_ln(stderr,
				   _("Continuing in %0.1f seconds, "
				     "assuming that you meant '%s'."),
				   (float)autocorrect/10.0, assumed);
			sleep_millisec(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_("\nThe most similar command is",
			      "\nThe most similar commands are",
			   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)
{
	int build_options = 0;
	const char * const usage[] = {
		N_("git version [<options>]"),
		NULL
	};
	struct option options[] = {
		OPT_BOOL(0, "build-options", &build_options,
			 "also print build options"),
		OPT_END()
	};

	argc = parse_options(argc, argv, prefix, options, usage, 0);

	/*
	 * The format of this string should be kept stable for compatibility
	 * with external projects that rely on the output of "git version".
	 *
	 * Always show the version, even if other options are given.
	 */
	printf("git version %s\n", git_version_string);

	if (build_options) {
		printf("cpu: %s\n", GIT_HOST_CPU);
		if (git_built_from_commit_string[0])
			printf("built from commit: %s\n",
			       git_built_from_commit_string);
		else
			printf("no commit associated with this build\n");
		printf("sizeof-long: %d\n", (int)sizeof(long));
		/* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
	}
	return 0;
}

struct similar_ref_cb {
	const char *base_ref;
	struct string_list *similar_refs;
};

static int append_similar_ref(const char *refname, const struct object_id *oid,
			      int flags, void *cb_data)
{
	struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);
	char *branch = strrchr(refname, '/') + 1;
	const char *remote;

	/* A remote branch of the same name is deemed similar */
	if (skip_prefix(refname, "refs/remotes/", &remote) &&
	    !strcmp(branch, cb->base_ref))
		string_list_append(cb->similar_refs, remote);
	return 0;
}

static struct string_list guess_refs(const char *ref)
{
	struct similar_ref_cb ref_cb;
	struct string_list similar_refs = STRING_LIST_INIT_NODUP;

	ref_cb.base_ref = ref;
	ref_cb.similar_refs = &similar_refs;
	for_each_ref(append_similar_ref, &ref_cb);
	return similar_refs;
}

void help_unknown_ref(const char *ref, const char *cmd, const char *error)
{
	int i;
	struct string_list suggested_refs = guess_refs(ref);

	fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);

	if (suggested_refs.nr > 0) {
		fprintf_ln(stderr,
			   Q_("\nDid you mean this?",
			      "\nDid you mean one of these?",
			      suggested_refs.nr));
		for (i = 0; i < suggested_refs.nr; i++)
			fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);
	}

	string_list_clear(&suggested_refs, 0);
	exit(1);
}
Commit	Line	Data
70827b15	1	#include "cache.h"
b2141fc1	2	#include "config.h"
70827b15 LT	3	#include "builtin.h"
70827b15 LT	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"
dbfae689 NTND	10	#include "column.h"
816fb46b	11	#include "version.h"
e5618106	12	#include "refs.h"
b48cbfc5	13	#include "parse-options.h"
64949984	14
cfb22a02 NTND	15	struct category_description {
	16	uint32_t category;
	17	const char *desc;
	18	};
	19	static uint32_t common_mask =
	20	CAT_init \| CAT_worktree \| CAT_info \|
	21	CAT_history \| CAT_remote;
	22	static 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	};
	30
	31	static const char drop_prefix(const char name)
	32	{
	33	const char *new_name;
	34
	35	if (skip_prefix(name, "git-", &new_name))
	36	return new_name;
	37	return name;
	38
	39	}
	40
	41	static void extract_cmds(struct cmdname_help **p_cmds, uint32_t mask)
	42	{
	43	int i, nr = 0;
	44	struct cmdname_help *cmds;
	45
	46	if (ARRAY_SIZE(command_list) == 0)
	47	BUG("empty command_list[] is a sign of broken generate-cmdlist.sh");
	48
	49	ALLOC_ARRAY(cmds, ARRAY_SIZE(command_list) + 1);
	50
	51	for (i = 0; i < ARRAY_SIZE(command_list); i++) {
	52	const struct cmdname_help *cmd = command_list + i;
	53
	54	if (!(cmd->category & mask))
	55	continue;
	56
	57	cmds[nr] = *cmd;
	58	cmds[nr].name = drop_prefix(cmd->name);
	59
	60	nr++;
	61	}
	62	cmds[nr].name = NULL;
	63	*p_cmds = cmds;
	64	}
	65
	66	static void print_command_list(const struct cmdname_help *cmds,
	67	uint32_t mask, int longest)
	68	{
	69	int i;
	70
	71	for (i = 0; cmds[i].name; i++) {
	72	if (cmds[i].category & mask) {
	73	printf(" %s ", cmds[i].name);
	74	mput_char(' ', longest - strlen(cmds[i].name));
	75	puts(_(cmds[i].help));
	76	}
	77	}
	78	}
79
80	static int cmd_name_cmp(const void elem1, const void elem2)
81	{
82	const struct cmdname_help *e1 = elem1;
83	const struct cmdname_help *e2 = elem2;
84
85	return strcmp(e1->name, e2->name);
86	}
87
88	static void print_cmd_by_category(const struct category_description *catdesc)
89	{
90	struct cmdname_help *cmds;
91	int longest = 0;
92	int i, nr = 0;
93	uint32_t mask = 0;
94
95	for (i = 0; catdesc[i].desc; i++)
96	mask \|= catdesc[i].category;
97
98	extract_cmds(&cmds, mask);
99
100	for (i = 0; cmds[i].name; i++, nr++) {
101	if (longest < strlen(cmds[i].name))
102	longest = strlen(cmds[i].name);
103	}
104	QSORT(cmds, nr, cmd_name_cmp);
105
106	for (i = 0; catdesc[i].desc; i++) {
107	uint32_t mask = catdesc[i].category;
108	const char *desc = catdesc[i].desc;
109
110	printf("\n%s\n", _(desc));
111	print_command_list(cmds, mask, longest);
112	}
113	free(cmds);
114	}
115
940208a7	116	void add_cmdname(struct cmdnames cmds, const char name, int len)
70827b15	117	{
96ffc06f JK	118	struct cmdname *ent;
96ffc06f JK	119	FLEX_ALLOC_MEM(ent, name, name, len);
70827b15	120	ent->len = len;
1eb05690 SP	121
	122	ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
	123	cmds->names[cmds->cnt++] = ent;
70827b15 LT	124	}
70827b15 LT	125
8af84dad JS	126	static void clean_cmdnames(struct cmdnames *cmds)
	127	{
	128	int i;
	129	for (i = 0; i < cmds->cnt; ++i)
	130	free(cmds->names[i]);
	131	free(cmds->names);
	132	cmds->cnt = 0;
	133	cmds->alloc = 0;
	134	}
	135
70827b15 LT	136	static int cmdname_compare(const void a_, const void b_)
	137	{
	138	struct cmdname a = (struct cmdname **)a_;
	139	struct cmdname b = (struct cmdname **)b_;
	140	return strcmp(a->name, b->name);
	141	}
	142
1eb05690 SP	143	static void uniq(struct cmdnames *cmds)
	144	{
	145	int i, j;
	146
	147	if (!cmds->cnt)
	148	return;
	149
4a15758f JK	150	for (i = j = 1; i < cmds->cnt; i++) {
	151	if (!strcmp(cmds->names[i]->name, cmds->names[j-1]->name))
	152	free(cmds->names[i]);
	153	else
1eb05690	154	cmds->names[j++] = cmds->names[i];
4a15758f	155	}
1eb05690 SP	156
	157	cmds->cnt = j;
	158	}
	159
940208a7	160	void exclude_cmds(struct cmdnames cmds, struct cmdnames excludes)
f3fa1838	161	{
1eb05690 SP	162	int ci, cj, ei;
	163	int cmp;
	164
	165	ci = cj = ei = 0;
	166	while (ci < cmds->cnt && ei < excludes->cnt) {
	167	cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
	168	if (cmp < 0)
	169	cmds->names[cj++] = cmds->names[ci++];
6a17f583 JH	170	else if (cmp == 0) {
	171	ei++;
	172	free(cmds->names[ci++]);
	173	} else if (cmp > 0)
1eb05690 SP	174	ei++;
	175	}
	176
	177	while (ci < cmds->cnt)
	178	cmds->names[cj++] = cmds->names[ci++];
	179
	180	cmds->cnt = cj;
	181	}
	182
d10cb3df	183	static void pretty_print_cmdnames(struct cmdnames *cmds, unsigned int colopts)
70827b15	184	{
dbfae689 NTND	185	struct string_list list = STRING_LIST_INIT_NODUP;
	186	struct column_options copts;
	187	int i;
70827b15	188
dbfae689 NTND	189	for (i = 0; i < cmds->cnt; i++)
	190	string_list_append(&list, cmds->names[i]->name);
	191	/*
	192	* always enable column display, we only consult column.*
	193	* about layout strategy and stuff
	194	*/
	195	colopts = (colopts & ~COL_ENABLE_MASK) \| COL_ENABLED;
	196	memset(&copts, 0, sizeof(copts));
	197	copts.indent = " ";
	198	copts.padding = 2;
	199	print_columns(&list, colopts, &copts);
	200	string_list_clear(&list, 0);
70827b15 LT	201	}
70827b15 LT	202
e321180e	203	static void list_commands_in_dir(struct cmdnames *cmds,
940208a7 MV	204	const char *path,
940208a7 MV	205	const char *prefix)
70827b15	206	{
1eb05690	207	DIR *dir = opendir(path);
70827b15	208	struct dirent *de;
f5d600e2 JS	209	struct strbuf buf = STRBUF_INIT;
f5d600e2 JS	210	int len;
70827b15	211
f5d600e2	212	if (!dir)
e321180e	213	return;
940208a7 MV	214	if (!prefix)
940208a7 MV	215	prefix = "git-";
70827b15	216
f5d600e2 JS	217	strbuf_addf(&buf, "%s/", path);
	218	len = buf.len;
	219
70827b15	220	while ((de = readdir(dir)) != NULL) {
de8118e1	221	const char *ent;
26936bfd	222	size_t entlen;
70827b15	223
de8118e1	224	if (!skip_prefix(de->d_name, prefix, &ent))
70827b15	225	continue;
0966003c	226
f5d600e2 JS	227	strbuf_setlen(&buf, len);
	228	strbuf_addstr(&buf, de->d_name);
	229	if (!is_executable(buf.buf))
70827b15 LT	230	continue;
70827b15 LT	231
de8118e1	232	entlen = strlen(ent);
6e409473	233	strip_suffix(ent, ".exe", &entlen);
70827b15	234
de8118e1	235	add_cmdname(cmds, ent, entlen);
70827b15 LT	236	}
70827b15 LT	237	closedir(dir);
f5d600e2	238	strbuf_release(&buf);
1eb05690 SP	239	}
1eb05690 SP	240
e321180e	241	void load_command_list(const char *prefix,
940208a7 MV	242	struct cmdnames *main_cmds,
940208a7 MV	243	struct cmdnames *other_cmds)
1eb05690	244	{
1eb05690	245	const char *env_path = getenv("PATH");
1eb05690 SP	246	const char *exec_path = git_exec_path();
1eb05690 SP	247
1f08e5ce	248	if (exec_path) {
e321180e	249	list_commands_in_dir(main_cmds, exec_path, prefix);
9ed0d8d6	250	QSORT(main_cmds->names, main_cmds->cnt, cmdname_compare);
1f08e5ce	251	uniq(main_cmds);
1eb05690 SP	252	}
1eb05690 SP	253
1f08e5ce AR	254	if (env_path) {
	255	char paths, path, *colon;
	256	path = paths = xstrdup(env_path);
	257	while (1) {
	258	if ((colon = strchr(path, PATH_SEP)))
	259	*colon = 0;
746c221a PB	260	if (!exec_path \|\| strcmp(path, exec_path))
746c221a PB	261	list_commands_in_dir(other_cmds, path, prefix);
1eb05690	262
1f08e5ce AR	263	if (!colon)
	264	break;
	265	path = colon + 1;
	266	}
	267	free(paths);
1eb05690	268
9ed0d8d6	269	QSORT(other_cmds->names, other_cmds->cnt, cmdname_compare);
1f08e5ce AR	270	uniq(other_cmds);
1f08e5ce AR	271	}
940208a7	272	exclude_cmds(other_cmds, main_cmds);
2156435f JK	273	}
2156435f JK	274
f4ed0af6	275	void list_commands(unsigned int colopts,
dbfae689	276	struct cmdnames main_cmds, struct cmdnames other_cmds)
2156435f	277	{
940208a7	278	if (main_cmds->cnt) {
61c5d431	279	const char *exec_path = git_exec_path();
4470ef94	280	printf_ln(_("available git commands in '%s'"), exec_path);
1eb05690	281	putchar('\n');
d10cb3df	282	pretty_print_cmdnames(main_cmds, colopts);
1eb05690 SP	283	putchar('\n');
	284	}
	285
940208a7	286	if (other_cmds->cnt) {
4470ef94	287	printf_ln(_("git commands available from elsewhere on your $PATH"));
940208a7	288	putchar('\n');
d10cb3df	289	pretty_print_cmdnames(other_cmds, colopts);
1eb05690 SP	290	putchar('\n');
1eb05690 SP	291	}
70827b15 LT	292	}
70827b15 LT	293
1542d4cd JH	294	void list_common_cmds_help(void)
1542d4cd JH	295	{
22414770	296	puts(_("These are common Git commands used in various situations:"));
cfb22a02	297	print_cmd_by_category(common_categories);
1542d4cd JH	298	}
1542d4cd JH	299
6bb2dc0b NTND	300	void list_all_main_cmds(struct string_list *list)
	301	{
	302	struct cmdnames main_cmds, other_cmds;
	303	int i;
	304
	305	memset(&main_cmds, 0, sizeof(main_cmds));
	306	memset(&other_cmds, 0, sizeof(other_cmds));
	307	load_command_list("git-", &main_cmds, &other_cmds);
	308
	309	for (i = 0; i < main_cmds.cnt; i++)
	310	string_list_append(list, main_cmds.names[i]->name);
	311
	312	clean_cmdnames(&main_cmds);
	313	clean_cmdnames(&other_cmds);
	314	}
	315
	316	void list_all_other_cmds(struct string_list *list)
	317	{
	318	struct cmdnames main_cmds, other_cmds;
	319	int i;
	320
	321	memset(&main_cmds, 0, sizeof(main_cmds));
	322	memset(&other_cmds, 0, sizeof(other_cmds));
	323	load_command_list("git-", &main_cmds, &other_cmds);
	324
	325	for (i = 0; i < other_cmds.cnt; i++)
	326	string_list_append(list, other_cmds.names[i]->name);
	327
	328	clean_cmdnames(&main_cmds);
	329	clean_cmdnames(&other_cmds);
	330	}
	331
940208a7	332	int is_in_cmdlist(struct cmdnames c, const char s)
2156435f JK	333	{
	334	int i;
	335	for (i = 0; i < c->cnt; i++)
	336	if (!strcmp(s, c->names[i]->name))
	337	return 1;
	338	return 0;
	339	}
	340
f0e90716	341	static int autocorrect;
746c221a	342	static struct cmdnames aliases;
f0e90716 AR	343
	344	static int git_unknown_cmd_config(const char var, const char value, void *cb)
	345	{
ae021d87 JK	346	const char *p;
ae021d87 JK	347
f0e90716 AR	348	if (!strcmp(var, "help.autocorrect"))
f0e90716 AR	349	autocorrect = git_config_int(var,value);
746c221a	350	/* Also use aliases for command lookup */
ae021d87 JK	351	if (skip_prefix(var, "alias.", &p))
ae021d87 JK	352	add_cmdname(&aliases, p, strlen(p));
f0e90716 AR	353
	354	return git_default_config(var, value, cb);
	355	}
	356
8af84dad	357	static int levenshtein_compare(const void p1, const void p2)
822a7d50	358	{
8af84dad JS	359	const struct cmdname const c1 = p1, const c2 = p2;
	360	const char s1 = (c1)->name, s2 = (c2)->name;
	361	int l1 = (*c1)->len;
	362	int l2 = (*c2)->len;
	363	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
	364	}
	365
746c221a PB	366	static void add_cmd_list(struct cmdnames cmds, struct cmdnames old)
	367	{
	368	int i;
	369	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
	370
	371	for (i = 0; i < old->cnt; i++)
	372	cmds->names[cmds->cnt++] = old->names[i];
88ce3ef6	373	FREE_AND_NULL(old->names);
746c221a	374	old->cnt = 0;
746c221a PB	375	}
746c221a PB	376
06500a02	377	/* An empirically derived magic number */
6612b9e4 EFL	378	#define SIMILARITY_FLOOR 7
6612b9e4 EFL	379	#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
06500a02	380
823e0ded MS	381	static const char bad_interpreter_advice[] =
	382	N_("'%s' appears to be a git command, but we were not\n"
	383	"able to execute it. Maybe git-%s is broken?");
	384
8af84dad	385	const char help_unknown_cmd(const char cmd)
822a7d50	386	{
8af84dad JS	387	int i, n, best_similarity = 0;
8af84dad JS	388	struct cmdnames main_cmds, other_cmds;
cfb22a02	389	struct cmdname_help *common_cmds;
8af84dad JS	390
8af84dad JS	391	memset(&main_cmds, 0, sizeof(main_cmds));
0b74f5dc	392	memset(&other_cmds, 0, sizeof(other_cmds));
746c221a	393	memset(&aliases, 0, sizeof(aliases));
8af84dad	394
659fef19	395	read_early_config(git_unknown_cmd_config, NULL);
f0e90716	396
8af84dad JS	397	load_command_list("git-", &main_cmds, &other_cmds);
8af84dad JS	398
746c221a PB	399	add_cmd_list(&main_cmds, &aliases);
746c221a PB	400	add_cmd_list(&main_cmds, &other_cmds);
9ed0d8d6	401	QSORT(main_cmds.names, main_cmds.cnt, cmdname_compare);
746c221a	402	uniq(&main_cmds);
8af84dad	403
cfb22a02 NTND	404	extract_cmds(&common_cmds, common_mask);
cfb22a02 NTND	405
6612b9e4 EFL	406	/* This abuses cmdname->len for levenshtein distance */
	407	for (i = 0, n = 0; i < main_cmds.cnt; i++) {
	408	int cmp = 0; /* avoid compiler stupidity */
	409	const char *candidate = main_cmds.names[i]->name;
	410
823e0ded MS	411	/*
	412	* An exact match means we have the command, but
	413	* for some reason exec'ing it gave us ENOENT; probably
	414	* it's a bad interpreter in the #! line.
	415	*/
	416	if (!strcmp(candidate, cmd))
	417	die(_(bad_interpreter_advice), cmd, cmd);
	418
6612b9e4	419	/* Does the candidate appear in common_cmds list? */
cfb22a02	420	while (common_cmds[n].name &&
6612b9e4 EFL	421	(cmp = strcmp(common_cmds[n].name, candidate)) < 0)
6612b9e4 EFL	422	n++;
cfb22a02	423	if (common_cmds[n].name && !cmp) {
6612b9e4 EFL	424	/* Yes, this is one of the common commands */
6612b9e4 EFL	425	n++; /* use the entry from common_cmds[] */
59556548	426	if (starts_with(candidate, cmd)) {
6612b9e4 EFL	427	/* Give prefix match a very good score */
	428	main_cmds.names[i]->len = 0;
	429	continue;
	430	}
	431	}
	432
8af84dad	433	main_cmds.names[i]->len =
c41494f8	434	levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
6612b9e4	435	}
cfb22a02	436	FREE_AND_NULL(common_cmds);
8af84dad	437
9ed0d8d6	438	QSORT(main_cmds.names, main_cmds.cnt, levenshtein_compare);
8af84dad JS	439
8af84dad JS	440	if (!main_cmds.cnt)
9665627d	441	die(_("Uh oh. Your system reports no Git commands at all."));
8af84dad	442
6612b9e4 EFL	443	/* skip and count prefix matches */
	444	for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
	445	; /* still counting */
	446
	447	if (main_cmds.cnt <= n) {
	448	/* prefix matches with everything? that is too ambiguous */
	449	best_similarity = SIMILARITY_FLOOR + 1;
	450	} else {
	451	/* count all the most similar ones */
	452	for (best_similarity = main_cmds.names[n++]->len;
	453	(n < main_cmds.cnt &&
	454	best_similarity == main_cmds.names[n]->len);
	455	n++)
	456	; /* still counting */
	457	}
06500a02	458	if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
8af84dad JS	459	const char *assumed = main_cmds.names[0]->name;
	460	main_cmds.names[0] = NULL;
	461	clean_cmdnames(&main_cmds);
9665627d NTND	462	fprintf_ln(stderr,
9665627d NTND	463	_("WARNING: You called a Git command named '%s', "
968b1fe2 MB	464	"which does not exist."),
	465	cmd);
	466	if (autocorrect < 0)
	467	fprintf_ln(stderr,
	468	_("Continuing under the assumption that "
	469	"you meant '%s'."),
	470	assumed);
	471	else {
	472	fprintf_ln(stderr,
	473	_("Continuing in %0.1f seconds, "
	474	"assuming that you meant '%s'."),
	475	(float)autocorrect/10.0, assumed);
2024d317	476	sleep_millisec(autocorrect * 100);
f0e90716	477	}
8af84dad JS	478	return assumed;
	479	}
	480
9665627d	481	fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
8af84dad	482
06500a02	483	if (SIMILAR_ENOUGH(best_similarity)) {
9665627d	484	fprintf_ln(stderr,
6c486862 JNA	485	Q_("\nThe most similar command is",
6c486862 JNA	486	"\nThe most similar commands are",
9665627d	487	n));
8af84dad JS	488
	489	for (i = 0; i < n; i++)
	490	fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
	491	}
	492
822a7d50 RJ	493	exit(1);
	494	}
	495
a633fca0	496	int cmd_version(int argc, const char *argv, const char prefix)
70827b15	497	{
b48cbfc5 JK	498	int build_options = 0;
	499	const char * const usage[] = {
	500	N_("git version [<options>]"),
	501	NULL
	502	};
	503	struct option options[] = {
	504	OPT_BOOL(0, "build-options", &build_options,
	505	"also print build options"),
	506	OPT_END()
	507	};
	508
	509	argc = parse_options(argc, argv, prefix, options, usage, 0);
	510
f2de0b97 DA	511	/*
	512	* The format of this string should be kept stable for compatibility
	513	* with external projects that rely on the output of "git version".
b48cbfc5 JK	514	*
b48cbfc5 JK	515	* Always show the version, even if other options are given.
f2de0b97	516	*/
70827b15	517	printf("git version %s\n", git_version_string);
b48cbfc5 JK	518
b48cbfc5 JK	519	if (build_options) {
b2289404	520	printf("cpu: %s\n", GIT_HOST_CPU);
ed32b788 JS	521	if (git_built_from_commit_string[0])
	522	printf("built from commit: %s\n",
	523	git_built_from_commit_string);
	524	else
	525	printf("no commit associated with this build\n");
b48cbfc5 JK	526	printf("sizeof-long: %d\n", (int)sizeof(long));
b48cbfc5 JK	527	/* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
6b9c38e1	528	}
70827b15 LT	529	return 0;
70827b15 LT	530	}
e5618106 VV	531
	532	struct similar_ref_cb {
	533	const char *base_ref;
	534	struct string_list *similar_refs;
	535	};
	536
91d6e94e	537	static int append_similar_ref(const char refname, const struct object_id oid,
e5618106 VV	538	int flags, void *cb_data)
	539	{
	540	struct similar_ref_cb cb = (struct similar_ref_cb )(cb_data);
	541	char *branch = strrchr(refname, '/') + 1;
95b567c7 JK	542	const char *remote;
95b567c7 JK	543
e5618106	544	/* A remote branch of the same name is deemed similar */
95b567c7	545	if (skip_prefix(refname, "refs/remotes/", &remote) &&
e5618106	546	!strcmp(branch, cb->base_ref))
95b567c7	547	string_list_append(cb->similar_refs, remote);
e5618106 VV	548	return 0;
	549	}
	550
	551	static struct string_list guess_refs(const char *ref)
	552	{
	553	struct similar_ref_cb ref_cb;
	554	struct string_list similar_refs = STRING_LIST_INIT_NODUP;
	555
	556	ref_cb.base_ref = ref;
	557	ref_cb.similar_refs = &similar_refs;
	558	for_each_ref(append_similar_ref, &ref_cb);
	559	return similar_refs;
	560	}
	561
	562	void help_unknown_ref(const char ref, const char cmd, const char *error)
	563	{
	564	int i;
	565	struct string_list suggested_refs = guess_refs(ref);
	566
	567	fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);
	568
	569	if (suggested_refs.nr > 0) {
	570	fprintf_ln(stderr,
	571	Q_("\nDid you mean this?",
	572	"\nDid you mean one of these?",
	573	suggested_refs.nr));
	574	for (i = 0; i < suggested_refs.nr; i++)
	575	fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);
	576	}
	577
	578	string_list_clear(&suggested_refs, 0);
	579	exit(1);
	580	}