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218e441daf
The ".pN" thing might be a common ending of a tag, and in contrast, ^ already is a special character for revisions so use that instead.
178 lines
3.2 KiB
C
178 lines
3.2 KiB
C
/*
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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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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 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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/*
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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;
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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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int ret;
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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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return get_sha1(name, sha1);
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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, revs_only = 0, no_revs = 0;
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char *def = NULL;
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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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printf("%s\n", 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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if (def) {
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printf("%s\n", def);
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def = NULL;
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}
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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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if (def)
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printf("%s\n", def);
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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 (revs_only | no_revs) {
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if (is_rev_argument(arg) != revs_only)
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continue;
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}
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printf("%s\n", 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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printf("%s\n", sha1_to_hex(end));
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printf("^%s\n", sha1_to_hex(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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printf("%s\n", sha1_to_hex(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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printf("^%s\n", sha1_to_hex(sha1));
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continue;
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}
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if (def) {
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printf("%s\n", def);
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def = NULL;
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}
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if (revs_only)
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continue;
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printf("%s\n", arg);
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}
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if (def)
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printf("%s\n", def);
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return 0;
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}
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