* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
+#include "commit.h"
+#include "refs.h"
+
+static char *def = NULL;
+static int no_revs = 0;
+static int single_rev = 0;
+static int revs_only = 0;
+static int do_rev_argument = 1;
+static int output_revs = 0;
+static int flags_only = 0;
+static int no_flags = 0;
+
+#define NORMAL 0
+#define REVERSED 1
+static int show_type = NORMAL;
+
+static int get_extended_sha1(char *name, unsigned char *sha1);
+
+/*
+ * 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[] = {
+ "--max-count=",
+ "--max-age=",
+ "--min-age=",
+ "--merge-order",
+ NULL
+ };
+ const char **p = rev_args;
+
+ for (;;) {
+ const char *str = *p++;
+ int len;
+ if (!str)
+ return 0;
+ len = strlen(str);
+ if (!strncmp(arg, str, len))
+ return 1;
+ }
+}
+
+static void show_rev(int type, const unsigned char *sha1)
+{
+ if (no_revs)
+ return;
+ output_revs++;
+ printf("%s%s\n", type == show_type ? "" : "^", sha1_to_hex(sha1));
+}
+
+static void show_rev_arg(char *rev)
+{
+ if (no_revs)
+ return;
+ puts(rev);
+}
+
+static void show_norev(char *norev)
+{
+ if (flags_only)
+ return;
+ if (revs_only)
+ return;
+ puts(norev);
+}
+
+static void show_arg(char *arg)
+{
+ if (no_flags)
+ return;
+ if (do_rev_argument && is_rev_argument(arg))
+ show_rev_arg(arg);
+ else
+ show_norev(arg);
+}
+
+static int get_parent(char *name, unsigned char *result, int idx)
+{
+ unsigned char sha1[20];
+ int ret = get_extended_sha1(name, sha1);
+ struct commit *commit;
+ struct commit_list *p;
+
+ if (ret)
+ return ret;
+ commit = lookup_commit_reference(sha1);
+ if (!commit)
+ return -1;
+ if (parse_commit(commit))
+ return -1;
+ if (!idx) {
+ memcpy(result, commit->object.sha1, 20);
+ return 0;
+ }
+ p = commit->parents;
+ while (p) {
+ if (!--idx) {
+ memcpy(result, p->item->object.sha1, 20);
+ return 0;
+ }
+ p = p->next;
+ }
+ return -1;
+}
+
+static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
+{
+ static char dirname[PATH_MAX];
+ char hex[40];
+ DIR *dir;
+ int found;
+
+ snprintf(dirname, sizeof(dirname), "%s/%.2s", get_object_directory(), name);
+ dir = opendir(dirname);
+ sprintf(hex, "%.2s", name);
+ found = 0;
+ if (dir) {
+ struct dirent *de;
+ while ((de = readdir(dir)) != NULL) {
+ if (strlen(de->d_name) != 38)
+ continue;
+ if (memcmp(de->d_name, name + 2, len-2))
+ continue;
+ memcpy(hex + 2, de->d_name, 38);
+ if (++found > 1)
+ break;
+ }
+ closedir(dir);
+ }
+ if (found == 1)
+ return get_sha1_hex(hex, sha1) == 0;
+ return 0;
+}
+
+static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
+{
+ do {
+ if (*a != *b)
+ return 0;
+ a++;
+ b++;
+ len -= 2;
+ } while (len > 1);
+ if (len)
+ if ((*a ^ *b) & 0xf0)
+ return 0;
+ return 1;
+}
+
+static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
+{
+ struct packed_git *p;
+
+ prepare_packed_git();
+ for (p = packed_git; p; p = p->next) {
+ unsigned num = num_packed_objects(p);
+ unsigned first = 0, last = num;
+ while (first < last) {
+ unsigned mid = (first + last) / 2;
+ unsigned char now[20];
+ int cmp;
+
+ nth_packed_object_sha1(p, mid, now);
+ cmp = memcmp(match, now, 20);
+ if (!cmp) {
+ first = mid;
+ break;
+ }
+ if (cmp > 0) {
+ first = mid+1;
+ continue;
+ }
+ last = mid;
+ }
+ if (first < num) {
+ unsigned char now[20], next[20];
+ nth_packed_object_sha1(p, first, now);
+ if (match_sha(len, match, now)) {
+ if (nth_packed_object_sha1(p, first+1, next) || !match_sha(len, match, next)) {
+ memcpy(sha1, now, 20);
+ return 1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+static int get_short_sha1(char *name, unsigned char *sha1)
+{
+ int i;
+ char canonical[40];
+ unsigned char res[20];
+
+ memset(res, 0, 20);
+ memset(canonical, 'x', 40);
+ for (i = 0;;i++) {
+ unsigned char c = name[i];
+ unsigned char val;
+ if (!c || i > 40)
+ break;
+ if (c >= '0' && c <= '9')
+ val = c - '0';
+ else if (c >= 'a' && c <= 'f')
+ val = c - 'a' + 10;
+ else if (c >= 'A' && c <='F') {
+ val = c - 'A' + 10;
+ c -= 'A' - 'a';
+ }
+ else
+ return -1;
+ canonical[i] = c;
+ if (!(i & 1))
+ val <<= 4;
+ res[i >> 1] |= val;
+ }
+ if (i < 4)
+ return -1;
+ if (find_short_object_filename(i, canonical, sha1))
+ return 0;
+ if (find_short_packed_object(i, res, sha1))
+ return 0;
+ return -1;
+}
+
+/*
+ * This is like "get_sha1()", except it allows "sha1 expressions",
+ * notably "xyz^" for "parent of xyz"
+ */
+static int get_extended_sha1(char *name, unsigned char *sha1)
+{
+ int parent, ret;
+ int len = strlen(name);
+
+ parent = 1;
+ if (len > 2 && name[len-1] >= '0' && name[len-1] <= '9') {
+ parent = name[len-1] - '0';
+ len--;
+ }
+ if (len > 1 && name[len-1] == '^') {
+ name[len-1] = 0;
+ ret = get_parent(name, sha1, parent);
+ name[len-1] = '^';
+ if (!ret)
+ return 0;
+ }
+ ret = get_sha1(name, sha1);
+ if (!ret)
+ return 0;
+ return get_short_sha1(name, sha1);
+}
+
+static void show_default(void)
+{
+ char *s = def;
+
+ if (s) {
+ unsigned char sha1[20];
+
+ def = NULL;
+ if (!get_extended_sha1(s, sha1)) {
+ show_rev(NORMAL, sha1);
+ return;
+ }
+ show_arg(s);
+ }
+}
+
+static int show_reference(const char *refname, const unsigned char *sha1)
+{
+ show_rev(NORMAL, sha1);
+ return 0;
+}
int main(int argc, char **argv)
{
- int i, as_is = 0, revs_only = 0, no_revs = 0;
- char *def = NULL;
+ int i, as_is = 0;
unsigned char sha1[20];
for (i = 1; i < argc; i++) {
char *dotdot;
if (as_is) {
- printf("%s\n", arg);
+ show_norev(arg);
continue;
}
if (*arg == '-') {
if (!strcmp(arg, "--")) {
- if (def) {
- printf("%s\n", def);
- def = NULL;
- }
+ show_default();
if (revs_only)
break;
as_is = 1;
}
if (!strcmp(arg, "--default")) {
- if (def)
- printf("%s\n", def);
def = argv[i+1];
i++;
continue;
no_revs = 1;
continue;
}
- if (revs_only)
+ if (!strcmp(arg, "--flags")) {
+ flags_only = 1;
continue;
- printf("%s\n", arg);
- continue;
- }
- if (!get_sha1(arg, sha1)) {
- if (no_revs)
+ }
+ if (!strcmp(arg, "--no-flags")) {
+ no_flags = 1;
continue;
- def = NULL;
- printf("%s\n", sha1_to_hex(sha1));
- continue;
- }
- if (*arg == '^' && !get_sha1(arg+1, sha1)) {
- if (no_revs)
+ }
+ if (!strcmp(arg, "--verify")) {
+ revs_only = 1;
+ do_rev_argument = 0;
+ single_rev = 1;
continue;
- def = NULL;
- printf("^%s\n", sha1_to_hex(sha1));
+ }
+ if (!strcmp(arg, "--not")) {
+ show_type ^= REVERSED;
+ continue;
+ }
+ if (!strcmp(arg, "--all")) {
+ for_each_ref(show_reference);
+ continue;
+ }
+ show_arg(arg);
continue;
}
dotdot = strstr(arg, "..");
unsigned char end[20];
char *n = dotdot+2;
*dotdot = 0;
- if (!get_sha1(arg, sha1)) {
+ if (!get_extended_sha1(arg, sha1)) {
if (!*n)
n = "HEAD";
- if (!get_sha1(n, end)) {
+ if (!get_extended_sha1(n, end)) {
if (no_revs)
continue;
def = NULL;
- printf("%s\n", sha1_to_hex(end));
- printf("^%s\n", sha1_to_hex(sha1));
+ show_rev(NORMAL, end);
+ show_rev(REVERSED, sha1);
continue;
}
}
*dotdot = '.';
}
- if (revs_only)
+ if (!get_extended_sha1(arg, sha1)) {
+ if (no_revs)
+ continue;
+ def = NULL;
+ show_rev(NORMAL, sha1);
continue;
- def = NULL;
- printf("%s\n", arg);
+ }
+ if (*arg == '^' && !get_extended_sha1(arg+1, sha1)) {
+ if (no_revs)
+ continue;
+ def = NULL;
+ show_rev(REVERSED, sha1);
+ continue;
+ }
+ show_default();
+ show_norev(arg);
+ }
+ show_default();
+ if (single_rev && output_revs != 1) {
+ fprintf(stderr, "Needed a single revision\n");
+ exit(1);
}
- if (def)
- printf("%s\n", def);
return 0;
}
projects / git.git / blobdiff