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