git/help.c

476 строки
12 KiB
C
Исходник Обычный вид История

#include "cache.h"
#include "config.h"
#include "builtin.h"
#include "exec_cmd.h"
#include "run-command.h"
#include "levenshtein.h"
#include "help.h"
#include "common-cmds.h"
#include "string-list.h"
#include "column.h"
#include "version.h"
#include "refs.h"
#include "parse-options.h"
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');
}
}
static int cmd_group_cmp(const void *elem1, const void *elem2)
{
const struct cmdname_help *e1 = elem1;
const struct cmdname_help *e2 = elem2;
if (e1->group < e2->group)
return -1;
if (e1->group > e2->group)
return 1;
return strcmp(e1->name, e2->name);
}
void list_common_cmds_help(void)
{
int i, longest = 0;
int current_grp = -1;
for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
if (longest < strlen(common_cmds[i].name))
longest = strlen(common_cmds[i].name);
}
QSORT(common_cmds, ARRAY_SIZE(common_cmds), cmd_group_cmp);
puts(_("These are common Git commands used in various situations:"));
for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
if (common_cmds[i].group != current_grp) {
printf("\n%s\n", _(common_cmd_groups[common_cmds[i].group]));
current_grp = common_cmds[i].group;
}
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)
{
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;
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);
/* 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 (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;
}
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,
usability: don't ask questions if no reply is required There has been a bug report by a corporate user that stated that "spelling mistake of stash followed by a yes prints character 'y' infinite times." This analysis was false. When the spelling of a command contains errors, the git program tries to help the user by providing candidates which are close to the unexisting command. E.g Git prints the following: git: 'stahs' is not a git command. See 'git --help'. Did you mean this? stash and then exits. The problem with this hint is that it is not formally indicated as an hint and the user is in fact encouraged to reply to the question, whereas the Git command is already finished. The user was unlucky enough that it was the command he was looking for, and replied "yes" on the command line, effectively launching the `yes` program. The initial error is that the Git programs, when launched in command-line mode (without interaction) must not ask questions, because these questions would normally require a user input as a reply that they won't handle indeed. That's a source of confusion on UX level. To improve the general usability of the Git suite, the following rule was applied: if the sentence * appears in a non-interactive session * is printed last before exit * is a question addressing the user ("you") the sentence is turned into affirmative and proposes the option. The basic rewording of the question sentences has been extended to other spots found in the source. Requested at https://github.com/git/git-scm.com/issues/999 by rpai1 Signed-off-by: Jean-Noel Avila <jn.avila@free.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-11 15:06:32 +03:00
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);
}