git/rev-parse.c
Junio C Hamano ce4a706388 revision arguments: ..B means HEAD..B, just like A.. means A..HEAD
For consistency reasons, we should probably allow that to be written as
just "..branch", the same way we can write "branch.." to mean "everything
in HEAD but not in "branch".

Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-03-29 19:41:37 -08:00

353 lines
6.8 KiB
C

/*
* rev-parse.c
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "commit.h"
#include "refs.h"
#include "quote.h"
#define DO_REVS 1
#define DO_NOREV 2
#define DO_FLAGS 4
#define DO_NONFLAGS 8
static int filter = ~0;
static char *def = NULL;
#define NORMAL 0
#define REVERSED 1
static int show_type = NORMAL;
static int symbolic = 0;
static int abbrev = 0;
static int output_sq = 0;
static int revs_count = 0;
/*
* Some arguments are relevant "revision" arguments,
* others are about output format or other details.
* This sorts it all out.
*/
static int is_rev_argument(const char *arg)
{
static const char *rev_args[] = {
"--all",
"--bisect",
"--dense",
"--header",
"--max-age=",
"--max-count=",
"--min-age=",
"--no-merges",
"--objects",
"--objects-edge",
"--parents",
"--pretty",
"--sparse",
"--topo-order",
"--date-order",
"--unpacked",
NULL
};
const char **p = rev_args;
/* accept -<digit>, like traditional "head" */
if ((*arg == '-') && isdigit(arg[1]))
return 1;
for (;;) {
const char *str = *p++;
int len;
if (!str)
return 0;
len = strlen(str);
if (!strcmp(arg, str) ||
(str[len-1] == '=' && !strncmp(arg, str, len)))
return 1;
}
}
/* Output argument as a string, either SQ or normal */
static void show(const char *arg)
{
if (output_sq) {
int sq = '\'', ch;
putchar(sq);
while ((ch = *arg++)) {
if (ch == sq)
fputs("'\\'", stdout);
putchar(ch);
}
putchar(sq);
putchar(' ');
}
else
puts(arg);
}
/* Output a revision, only if filter allows it */
static void show_rev(int type, const unsigned char *sha1, const char *name)
{
if (!(filter & DO_REVS))
return;
def = NULL;
revs_count++;
if (type != show_type)
putchar('^');
if (symbolic && name)
show(name);
else if (abbrev)
show(find_unique_abbrev(sha1, abbrev));
else
show(sha1_to_hex(sha1));
}
/* Output a flag, only if filter allows it. */
static int show_flag(char *arg)
{
if (!(filter & DO_FLAGS))
return 0;
if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
show(arg);
return 1;
}
return 0;
}
static void show_default(void)
{
char *s = def;
if (s) {
unsigned char sha1[20];
def = NULL;
if (!get_sha1(s, sha1)) {
show_rev(NORMAL, sha1, s);
return;
}
}
}
static int show_reference(const char *refname, const unsigned char *sha1)
{
show_rev(NORMAL, sha1, refname);
return 0;
}
static void show_datestring(const char *flag, const char *datestr)
{
static char buffer[100];
/* date handling requires both flags and revs */
if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
return;
snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
show(buffer);
}
static int show_file(const char *arg)
{
show_default();
if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
show(arg);
return 1;
}
return 0;
}
int main(int argc, char **argv)
{
int i, as_is = 0, verify = 0;
unsigned char sha1[20];
const char *prefix = setup_git_directory();
git_config(git_default_config);
for (i = 1; i < argc; i++) {
struct stat st;
char *arg = argv[i];
char *dotdot;
if (as_is) {
if (show_file(arg) && as_is < 2)
if (lstat(arg, &st) < 0)
die("'%s': %s", arg, strerror(errno));
continue;
}
if (!strcmp(arg,"-n")) {
if (++i >= argc)
die("-n requires an argument");
if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
show(arg);
show(argv[i]);
}
continue;
}
if (!strncmp(arg,"-n",2)) {
if ((filter & DO_FLAGS) && (filter & DO_REVS))
show(arg);
continue;
}
if (*arg == '-') {
if (!strcmp(arg, "--")) {
as_is = 2;
/* Pass on the "--" if we show anything but files.. */
if (filter & (DO_FLAGS | DO_REVS))
show_file(arg);
continue;
}
if (!strcmp(arg, "--default")) {
def = argv[i+1];
i++;
continue;
}
if (!strcmp(arg, "--revs-only")) {
filter &= ~DO_NOREV;
continue;
}
if (!strcmp(arg, "--no-revs")) {
filter &= ~DO_REVS;
continue;
}
if (!strcmp(arg, "--flags")) {
filter &= ~DO_NONFLAGS;
continue;
}
if (!strcmp(arg, "--no-flags")) {
filter &= ~DO_FLAGS;
continue;
}
if (!strcmp(arg, "--verify")) {
filter &= ~(DO_FLAGS|DO_NOREV);
verify = 1;
continue;
}
if (!strcmp(arg, "--short") ||
!strncmp(arg, "--short=", 8)) {
filter &= ~(DO_FLAGS|DO_NOREV);
verify = 1;
abbrev = DEFAULT_ABBREV;
if (arg[7] == '=')
abbrev = strtoul(arg + 8, NULL, 10);
if (abbrev < MINIMUM_ABBREV)
abbrev = MINIMUM_ABBREV;
else if (40 <= abbrev)
abbrev = 40;
continue;
}
if (!strcmp(arg, "--sq")) {
output_sq = 1;
continue;
}
if (!strcmp(arg, "--not")) {
show_type ^= REVERSED;
continue;
}
if (!strcmp(arg, "--symbolic")) {
symbolic = 1;
continue;
}
if (!strcmp(arg, "--all")) {
for_each_ref(show_reference);
continue;
}
if (!strcmp(arg, "--show-prefix")) {
if (prefix)
puts(prefix);
continue;
}
if (!strcmp(arg, "--show-cdup")) {
const char *pfx = prefix;
while (pfx) {
pfx = strchr(pfx, '/');
if (pfx) {
pfx++;
printf("../");
}
}
putchar('\n');
continue;
}
if (!strcmp(arg, "--git-dir")) {
const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
static char cwd[PATH_MAX];
if (gitdir) {
puts(gitdir);
continue;
}
if (!prefix) {
puts(".git");
continue;
}
if (!getcwd(cwd, PATH_MAX))
die("unable to get current working directory");
printf("%s/.git\n", cwd);
continue;
}
if (!strncmp(arg, "--since=", 8)) {
show_datestring("--max-age=", arg+8);
continue;
}
if (!strncmp(arg, "--after=", 8)) {
show_datestring("--max-age=", arg+8);
continue;
}
if (!strncmp(arg, "--before=", 9)) {
show_datestring("--min-age=", arg+9);
continue;
}
if (!strncmp(arg, "--until=", 8)) {
show_datestring("--min-age=", arg+8);
continue;
}
if (show_flag(arg) && verify)
die("Needed a single revision");
continue;
}
/* Not a flag argument */
dotdot = strstr(arg, "..");
if (dotdot) {
unsigned char end[20];
char *next = dotdot + 2;
char *this = arg;
*dotdot = 0;
if (!*next)
next = "HEAD";
if (dotdot == arg)
this = "HEAD";
if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
show_rev(NORMAL, end, next);
show_rev(REVERSED, sha1, this);
continue;
}
*dotdot = '.';
}
if (!get_sha1(arg, sha1)) {
show_rev(NORMAL, sha1, arg);
continue;
}
if (*arg == '^' && !get_sha1(arg+1, sha1)) {
show_rev(REVERSED, sha1, arg+1);
continue;
}
as_is = 1;
if (!show_file(arg))
continue;
if (verify)
die("Needed a single revision");
if (lstat(arg, &st) < 0)
die("'%s': %s", arg, strerror(errno));
}
show_default();
if (verify && revs_count != 1)
die("Needed a single revision");
return 0;
}