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Make rev-parse understand "extended sha1" syntax

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You can say "HEAD.p" for the "parent of HEAD". It nests, so

	HEAD.p2.p

means parent of second parent of HEAD (which obviously depends
on HEAD being a merge).
This commit is contained in:
Linus Torvalds 2005-06-20 20:28:09 -07:00
parent 6c88be1698
commit a8be83fe00
1 changed files with 57 additions and 4 deletions
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61
rev-parse.c
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@ -4,6 +4,9 @@
* Copyright (C) Linus Torvalds, 2005
*/
#include "cache.h"
#include "commit.h"
static int get_extended_sha1(char *name, unsigned char *sha1);
/*
* Some arguments are relevant "revision" arguments,
@ -32,6 +35,56 @@ static int is_rev_argument(const char *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;
p = commit->parents;
while (p) {
if (!--idx) {
memcpy(result, p->item->object.sha1, 20);
return 0;
}
p = p->next;
}
return -1;
}
/*
* This is like "get_sha1()", except it allows "sha1 expressions",
* notably "xyz.p" for "parent of xyz"
*/
static int get_extended_sha1(char *name, unsigned char *sha1)
{
int parent;
int len = strlen(name);
parent = 1;
if (len > 3 && name[len-1] >= '1' && name[len-1] <= '9') {
parent = name[len-1] - '0';
len--;
}
if (len > 2 && !memcmp(name + len - 2, ".p", 2)) {
int ret;
name[len-2] = 0;
ret = get_parent(name, sha1, parent);
name[len-2] = '.';
if (!ret)
return 0;
}
return get_sha1(name, sha1);
}
int main(int argc, char **argv)
{
int i, as_is = 0, revs_only = 0, no_revs = 0;
@ -83,10 +136,10 @@ int main(int argc, char **argv)
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;
@ -97,14 +150,14 @@ int main(int argc, char **argv)
}
*dotdot = '.';
}
if (!get_sha1(arg, sha1)) {
if (!get_extended_sha1(arg, sha1)) {
if (no_revs)
continue;
def = NULL;
printf("%s\n", sha1_to_hex(sha1));
continue;
}
if (*arg == '^' && !get_sha1(arg+1, sha1)) {
if (*arg == '^' && !get_extended_sha1(arg+1, sha1)) {
if (no_revs)
continue;
def = NULL;