git/git.c
Linus Torvalds 7b0c996679 Move "--parent" parsing into generic revision.c library code
Not only do we do it in both rev-list.c and git.c, the revision walking
code will soon want to know whether we should rewrite parenthood
information or not.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-03-31 16:24:48 -08:00

472 lines
10 KiB
C

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <sys/ioctl.h>
#include "git-compat-util.h"
#include "exec_cmd.h"
#include "common-cmds.h"
#include "cache.h"
#include "commit.h"
#include "revision.h"
#ifndef PATH_MAX
# define PATH_MAX 4096
#endif
static const char git_usage[] =
"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
/* most gui terms set COLUMNS (although some don't export it) */
static int term_columns(void)
{
char *col_string = getenv("COLUMNS");
int n_cols = 0;
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;
}
static void oom(void)
{
fprintf(stderr, "git: out of memory\n");
exit(1);
}
static inline void mput_char(char c, unsigned int num)
{
while(num--)
putchar(c);
}
static struct cmdname {
size_t len;
char name[1];
} **cmdname;
static int cmdname_alloc, cmdname_cnt;
static void add_cmdname(const char *name, int len)
{
struct cmdname *ent;
if (cmdname_alloc <= cmdname_cnt) {
cmdname_alloc = cmdname_alloc + 200;
cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
if (!cmdname)
oom();
}
ent = malloc(sizeof(*ent) + len);
if (!ent)
oom();
ent->len = len;
memcpy(ent->name, name, len);
ent->name[len] = 0;
cmdname[cmdname_cnt++] = ent;
}
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 pretty_print_string_list(struct cmdname **cmdname, 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 = (cmdname_cnt + cols - 1) / cols;
qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
for (i = 0; i < rows; i++) {
printf(" ");
for (j = 0; j < cols; j++) {
int n = j * rows + i;
int size = space;
if (n >= cmdname_cnt)
break;
if (j == cols-1 || n + rows >= cmdname_cnt)
size = 1;
printf("%-*s", size, cmdname[n]->name);
}
putchar('\n');
}
}
static void list_commands(const char *exec_path, const char *pattern)
{
unsigned int longest = 0;
char path[PATH_MAX];
int dirlen;
DIR *dir = opendir(exec_path);
struct dirent *de;
if (!dir) {
fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
exit(1);
}
dirlen = strlen(exec_path);
if (PATH_MAX - 20 < dirlen) {
fprintf(stderr, "git: insanely long exec-path '%s'\n",
exec_path);
exit(1);
}
memcpy(path, exec_path, dirlen);
path[dirlen++] = '/';
while ((de = readdir(dir)) != NULL) {
struct stat st;
int entlen;
if (strncmp(de->d_name, "git-", 4))
continue;
strcpy(path+dirlen, de->d_name);
if (stat(path, &st) || /* stat, not lstat */
!S_ISREG(st.st_mode) ||
!(st.st_mode & S_IXUSR))
continue;
entlen = strlen(de->d_name);
if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
entlen -= 4;
if (longest < entlen)
longest = entlen;
add_cmdname(de->d_name + 4, entlen-4);
}
closedir(dir);
printf("git commands available in '%s'\n", exec_path);
printf("----------------------------");
mput_char('-', strlen(exec_path));
putchar('\n');
pretty_print_string_list(cmdname, longest - 4);
putchar('\n');
}
static void list_common_cmds_help()
{
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) + 4);
puts(common_cmds[i].help);
}
puts("(use 'git help -a' to get a list of all installed git commands)");
}
#ifdef __GNUC__
static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
__attribute__((__format__(__printf__, 3, 4), __noreturn__));
#endif
static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
{
if (fmt) {
va_list ap;
va_start(ap, fmt);
printf("git: ");
vprintf(fmt, ap);
va_end(ap);
putchar('\n');
}
else
puts(git_usage);
if (exec_path) {
putchar('\n');
if (show_all)
list_commands(exec_path, "git-*");
else
list_common_cmds_help();
}
exit(1);
}
static void prepend_to_path(const char *dir, int len)
{
char *path, *old_path = getenv("PATH");
int path_len = len;
if (!old_path)
old_path = "/usr/local/bin:/usr/bin:/bin";
path_len = len + strlen(old_path) + 1;
path = malloc(path_len + 1);
memcpy(path, dir, len);
path[len] = ':';
memcpy(path + len + 1, old_path, path_len - len);
setenv("PATH", path, 1);
}
static void show_man_page(const char *git_cmd)
{
const char *page;
if (!strncmp(git_cmd, "git", 3))
page = git_cmd;
else {
int page_len = strlen(git_cmd) + 4;
char *p = malloc(page_len + 1);
strcpy(p, "git-");
strcpy(p + 4, git_cmd);
p[page_len] = 0;
page = p;
}
execlp("man", "man", page, NULL);
}
static int cmd_version(int argc, const char **argv, char **envp)
{
printf("git version %s\n", GIT_VERSION);
return 0;
}
static int cmd_help(int argc, const char **argv, char **envp)
{
const char *help_cmd = argv[1];
if (!help_cmd)
cmd_usage(0, git_exec_path(), NULL);
else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
cmd_usage(1, git_exec_path(), NULL);
else
show_man_page(help_cmd);
return 0;
}
#define LOGSIZE (65536)
static int cmd_log(int argc, const char **argv, char **envp)
{
struct rev_info rev;
struct commit *commit;
char *buf = xmalloc(LOGSIZE);
static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
int abbrev = DEFAULT_ABBREV;
const char *commit_prefix = "commit ";
argc = setup_revisions(argc, argv, &rev, "HEAD");
while (1 < argc) {
const char *arg = argv[1];
if (!strncmp(arg, "--pretty", 8)) {
commit_format = get_commit_format(arg + 8);
if (commit_format == CMIT_FMT_ONELINE)
commit_prefix = "";
}
else if (!strcmp(arg, "--no-abbrev")) {
abbrev = 0;
}
else if (!strncmp(arg, "--abbrev=", 9)) {
abbrev = strtoul(arg + 9, NULL, 10);
if (abbrev && abbrev < MINIMUM_ABBREV)
abbrev = MINIMUM_ABBREV;
else if (40 < abbrev)
abbrev = 40;
}
else
die("unrecognized argument: %s", arg);
argc--; argv++;
}
prepare_revision_walk(&rev);
setup_pager();
while ((commit = get_revision(&rev)) != NULL) {
printf("%s%s", commit_prefix,
sha1_to_hex(commit->object.sha1));
if (rev.parents) {
struct commit_list *parents = commit->parents;
while (parents) {
struct object *o = &(parents->item->object);
parents = parents->next;
if (o->flags & TMP_MARK)
continue;
printf(" %s", sha1_to_hex(o->sha1));
o->flags |= TMP_MARK;
}
/* TMP_MARK is a general purpose flag that can
* be used locally, but the user should clean
* things up after it is done with them.
*/
for (parents = commit->parents;
parents;
parents = parents->next)
parents->item->object.flags &= ~TMP_MARK;
}
if (commit_format == CMIT_FMT_ONELINE)
putchar(' ');
else
putchar('\n');
pretty_print_commit(commit_format, commit, ~0, buf,
LOGSIZE, abbrev);
printf("%s\n", buf);
}
free(buf);
return 0;
}
static void handle_internal_command(int argc, const char **argv, char **envp)
{
const char *cmd = argv[0];
static struct cmd_struct {
const char *cmd;
int (*fn)(int, const char **, char **);
} commands[] = {
{ "version", cmd_version },
{ "help", cmd_help },
{ "log", cmd_log },
};
int i;
for (i = 0; i < ARRAY_SIZE(commands); i++) {
struct cmd_struct *p = commands+i;
if (strcmp(p->cmd, cmd))
continue;
exit(p->fn(argc, argv, envp));
}
}
int main(int argc, const char **argv, char **envp)
{
const char *cmd = argv[0];
char *slash = strrchr(cmd, '/');
char git_command[PATH_MAX + 1];
const char *exec_path = NULL;
/*
* Take the basename of argv[0] as the command
* name, and the dirname as the default exec_path
* if it's an absolute path and we don't have
* anything better.
*/
if (slash) {
*slash++ = 0;
if (*cmd == '/')
exec_path = cmd;
cmd = slash;
}
/*
* "git-xxxx" is the same as "git xxxx", but we obviously:
*
* - cannot take flags in between the "git" and the "xxxx".
* - cannot execute it externally (since it would just do
* the same thing over again)
*
* So we just directly call the internal command handler, and
* die if that one cannot handle it.
*/
if (!strncmp(cmd, "git-", 4)) {
cmd += 4;
argv[0] = cmd;
handle_internal_command(argc, argv, envp);
die("cannot handle %s internally", cmd);
}
/* Default command: "help" */
cmd = "help";
/* Look for flags.. */
while (argc > 1) {
cmd = *++argv;
argc--;
if (strncmp(cmd, "--", 2))
break;
cmd += 2;
/*
* For legacy reasons, the "version" and "help"
* commands can be written with "--" prepended
* to make them look like flags.
*/
if (!strcmp(cmd, "help"))
break;
if (!strcmp(cmd, "version"))
break;
/*
* Check remaining flags (which by now must be
* "--exec-path", but maybe we will accept
* other arguments some day)
*/
if (!strncmp(cmd, "exec-path", 9)) {
cmd += 9;
if (*cmd == '=') {
git_set_exec_path(cmd + 1);
continue;
}
puts(git_exec_path());
exit(0);
}
cmd_usage(0, NULL, NULL);
}
argv[0] = cmd;
/*
* We search for git commands in the following order:
* - git_exec_path()
* - the path of the "git" command if we could find it
* in $0
* - the regular PATH.
*/
if (exec_path)
prepend_to_path(exec_path, strlen(exec_path));
exec_path = git_exec_path();
prepend_to_path(exec_path, strlen(exec_path));
/* See if it's an internal command */
handle_internal_command(argc, argv, envp);
/* .. then try the external ones */
execv_git_cmd(argv);
if (errno == ENOENT)
cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
fprintf(stderr, "Failed to run command '%s': %s\n",
git_command, strerror(errno));
return 1;
}