git/help.c
Ævar Arnfjörð Bjarmason 06fa4db3f7 help: move column config discovery to help.c library
When a git_config() call was added in dbfae68969 (help: reuse
print_columns() for help -a, 2012-04-13) to read the column config
we'd always use the resulting "colopts" variable.

Then in 63eae83f8f (help: add "-a --verbose" to list all commands
with synopsis, 2018-05-20) we started only using the "colopts" config
under "--all" if "--no-verbose" was also given, but the "git_config()"
call was not moved inside the "verbose" branch of the code.

This change effectively does that, we'll only call list_commands()
under "--all --no-verbose", so let's have it look up the config it
needs. See 26c7d06783 (help -a: improve and make --verbose default, 2018-09-29) for another case in help.c where we look up config.

The get_colopts() function is named for consistency with the existing
get_alias() function added in 26c7d06783.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-09-23 10:30:43 -07:00

775 lines
19 KiB
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"
#include "prompt.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 struct category_description main_categories[] = {
{ CAT_mainporcelain, N_("Main Porcelain Commands") },
{ CAT_ancillarymanipulators, N_("Ancillary Commands / Manipulators") },
{ CAT_ancillaryinterrogators, N_("Ancillary Commands / Interrogators") },
{ CAT_foreignscminterface, N_("Interacting with Others") },
{ CAT_plumbingmanipulators, N_("Low-level Commands / Manipulators") },
{ CAT_plumbinginterrogators, N_("Low-level Commands / Interrogators") },
{ CAT_synchingrepositories, N_("Low-level Commands / Syncing Repositories") },
{ CAT_purehelpers, N_("Low-level Commands / Internal Helpers") },
{ 0, NULL }
};
static const char *drop_prefix(const char *name, uint32_t category)
{
const char *new_name;
if (skip_prefix(name, "git-", &new_name))
return new_name;
if (category == CAT_guide && 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, cmd->category);
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) {
size_t len = strlen(cmds[i].name);
printf(" %s ", cmds[i].name);
if (longest > len)
mput_char(' ', longest - len);
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,
int *longest_p)
{
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);
if (longest_p)
*longest_p = longest;
}
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();
load_builtin_commands(prefix, main_cmds);
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);
}
static int get_colopts(const char *var, const char *value, void *data)
{
unsigned int *colopts = data;
if (starts_with(var, "column."))
return git_column_config(var, value, "help", colopts);
return 0;
}
void list_commands(struct cmdnames *main_cmds, struct cmdnames *other_cmds)
{
unsigned int colopts = 0;
git_config(get_colopts, &colopts);
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, NULL);
}
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);
}
void list_cmds_by_category(struct string_list *list,
const char *cat)
{
int i, n = ARRAY_SIZE(command_list);
uint32_t cat_id = 0;
for (i = 0; category_names[i]; i++) {
if (!strcmp(cat, category_names[i])) {
cat_id = 1UL << i;
break;
}
}
if (!cat_id)
die(_("unsupported command listing type '%s'"), cat);
for (i = 0; i < n; i++) {
struct cmdname_help *cmd = command_list + i;
if (!(cmd->category & cat_id))
continue;
string_list_append(list, drop_prefix(cmd->name, cmd->category));
}
}
void list_cmds_by_config(struct string_list *list)
{
const char *cmd_list;
if (git_config_get_string_tmp("completion.commands", &cmd_list))
return;
string_list_sort(list);
string_list_remove_duplicates(list, 0);
while (*cmd_list) {
struct strbuf sb = STRBUF_INIT;
const char *p = strchrnul(cmd_list, ' ');
strbuf_add(&sb, cmd_list, p - cmd_list);
if (sb.buf[0] == '-')
string_list_remove(list, sb.buf + 1, 0);
else
string_list_insert(list, sb.buf);
strbuf_release(&sb);
while (*p == ' ')
p++;
cmd_list = p;
}
}
void list_guides_help(void)
{
struct category_description catdesc[] = {
{ CAT_guide, N_("The Git concept guides are:") },
{ 0, NULL }
};
print_cmd_by_category(catdesc, NULL);
putchar('\n');
}
static int get_alias(const char *var, const char *value, void *data)
{
struct string_list *list = data;
if (skip_prefix(var, "alias.", &var))
string_list_append(list, var)->util = xstrdup(value);
return 0;
}
void list_all_cmds_help(void)
{
struct string_list others = STRING_LIST_INIT_DUP;
struct string_list alias_list = STRING_LIST_INIT_DUP;
struct cmdname_help *aliases;
int i, longest;
printf_ln(_("See 'git help <command>' to read about a specific subcommand"));
print_cmd_by_category(main_categories, &longest);
list_all_other_cmds(&others);
if (others.nr)
printf("\n%s\n", _("External commands"));
for (i = 0; i < others.nr; i++)
printf(" %s\n", others.items[i].string);
string_list_clear(&others, 0);
git_config(get_alias, &alias_list);
string_list_sort(&alias_list);
for (i = 0; i < alias_list.nr; i++) {
size_t len = strlen(alias_list.items[i].string);
if (longest < len)
longest = len;
}
if (alias_list.nr) {
printf("\n%s\n", _("Command aliases"));
ALLOC_ARRAY(aliases, alias_list.nr + 1);
for (i = 0; i < alias_list.nr; i++) {
aliases[i].name = alias_list.items[i].string;
aliases[i].help = alias_list.items[i].util;
aliases[i].category = 1;
}
aliases[alias_list.nr].name = NULL;
print_command_list(aliases, 1, longest);
free(aliases);
}
string_list_clear(&alias_list, 1);
}
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;
#define AUTOCORRECT_PROMPT (-3)
#define AUTOCORRECT_NEVER (-2)
#define AUTOCORRECT_IMMEDIATELY (-1)
static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
{
const char *p;
if (!strcmp(var, "help.autocorrect")) {
if (!value)
return config_error_nonbool(var);
if (!strcmp(value, "never")) {
autocorrect = AUTOCORRECT_NEVER;
} else if (!strcmp(value, "immediate")) {
autocorrect = AUTOCORRECT_IMMEDIATELY;
} else if (!strcmp(value, "prompt")) {
autocorrect = AUTOCORRECT_PROMPT;
} else {
int v = git_config_int(var, value);
autocorrect = (v < 0)
? AUTOCORRECT_IMMEDIATELY : v;
}
}
/* 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);
/*
* Disable autocorrection prompt in a non-interactive session
*/
if ((autocorrect == AUTOCORRECT_PROMPT) && (!isatty(0) || !isatty(2)))
autocorrect = AUTOCORRECT_NEVER;
if (autocorrect == AUTOCORRECT_NEVER) {
fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
exit(1);
}
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 == AUTOCORRECT_IMMEDIATELY)
fprintf_ln(stderr,
_("Continuing under the assumption that "
"you meant '%s'."),
assumed);
else if (autocorrect == AUTOCORRECT_PROMPT) {
char *answer;
struct strbuf msg = STRBUF_INIT;
strbuf_addf(&msg, _("Run '%s' instead? (y/N)"), assumed);
answer = git_prompt(msg.buf, PROMPT_ECHO);
strbuf_release(&msg);
if (!(starts_with(answer, "y") ||
starts_with(answer, "Y")))
exit(1);
} 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);
}
void get_version_info(struct strbuf *buf, int show_build_options)
{
/*
* 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.
*/
strbuf_addf(buf, "git version %s\n", git_version_string);
if (show_build_options) {
strbuf_addf(buf, "cpu: %s\n", GIT_HOST_CPU);
if (git_built_from_commit_string[0])
strbuf_addf(buf, "built from commit: %s\n",
git_built_from_commit_string);
else
strbuf_addstr(buf, "no commit associated with this build\n");
strbuf_addf(buf, "sizeof-long: %d\n", (int)sizeof(long));
strbuf_addf(buf, "sizeof-size_t: %d\n", (int)sizeof(size_t));
strbuf_addf(buf, "shell-path: %s\n", SHELL_PATH);
/* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
}
}
int cmd_version(int argc, const char **argv, const char *prefix)
{
struct strbuf buf = STRBUF_INIT;
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);
get_version_info(&buf, build_options);
printf("%s", buf.buf);
strbuf_release(&buf);
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;
/* A remote branch of the same name is deemed similar */
if (starts_with(refname, "refs/remotes/") &&
!strcmp(branch, cb->base_ref))
string_list_append_nodup(cb->similar_refs,
shorten_unambiguous_ref(refname, 1));
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_DUP;
ref_cb.base_ref = ref;
ref_cb.similar_refs = &similar_refs;
for_each_ref(append_similar_ref, &ref_cb);
return similar_refs;
}
NORETURN 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);
}