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sha1_name: tweak @{-N} lookup

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Have the lookup only look at "interesting" checkouts, meaning those
that tell you "Already on ..." don't count even though they also cause
a reflog entry.

Let interpret_nth_last_branch() return the number of characters
parsed, so that git-checkout can verify that the branch spec was
@{-N}, not @{-1}^2 or something like that.  (The latter will be added
later.)

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Thomas Rast 2009-01-17 17:09:54 +01:00 committed by Junio C Hamano
parent ae5a6c3684
commit a884d0cb71
2 changed files with 31 additions and 24 deletions
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4
builtin-checkout.c
View file

@ -361,8 +361,10 @@ struct branch_info {
static void setup_branch_path(struct branch_info *branch)
{
struct strbuf buf = STRBUF_INIT;
int ret;
if (!interpret_nth_last_branch(branch->name, &buf)) {
if ((ret = interpret_nth_last_branch(branch->name, &buf))
&& ret == strlen(branch->name)) {
branch->name = xstrdup(buf.buf);
strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
} else {

51
sha1_name.c
View file

@ -685,29 +685,28 @@ static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
const char *message, void *cb_data)
{
struct grab_nth_branch_switch_cbdata *cb = cb_data;
const char *match = NULL;
const char *match = NULL, *target = NULL;
size_t len;
if (!prefixcmp(message, "checkout: moving to "))
match = message + strlen("checkout: moving to ");
else if (!prefixcmp(message, "checkout: moving from ")) {
const char *cp = message + strlen("checkout: moving from ");
if ((cp = strstr(cp, " to ")) != NULL) {
match = cp + 4;
}
if (!prefixcmp(message, "checkout: moving from ")) {
match = message + strlen("checkout: moving from ");
if ((target = strstr(match, " to ")) != NULL)
target += 4;
}
if (!match)
return 0;
len = target - match - 4;
if (target[len] == '\n' && !strncmp(match, target, len))
return 0;
if (cb->counting) {
cb->nth++;
return 0;
}
if (--cb->nth <= 0) {
size_t len = strlen(match);
while (match[len-1] == '\n')
len--;
if (cb->nth-- <= 0) {
strbuf_reset(cb->buf);
strbuf_add(cb->buf, match, len);
return 1;
@ -718,26 +717,28 @@ static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
/*
* This reads "@{-N}" syntax, finds the name of the Nth previous
* branch we were on, and places the name of the branch in the given
* buf and returns 0 if successful.
* buf and returns the number of characters parsed if successful.
*
* If the input is not of the accepted format, it returns a negative
* number to signal an error.
*
* If the input was ok but there are not N branch switches in the
* reflog, it returns 0.
*/
int interpret_nth_last_branch(const char *name, struct strbuf *buf)
{
int nth, i;
int nth;
struct grab_nth_branch_switch_cbdata cb;
const char *brace;
char *num_end;
if (name[0] != '@' || name[1] != '{' || name[2] != '-')
return -1;
for (i = 3, nth = 0; name[i] && name[i] != '}'; i++) {
char ch = name[i];
if ('0' <= ch && ch <= '9')
nth = nth * 10 + ch - '0';
else
return -1;
}
if (nth < 0 || 10 <= nth)
brace = strchr(name, '}');
if (!brace)
return -1;
nth = strtol(name+3, &num_end, 10);
if (num_end != brace)
return -1;
cb.counting = 1;
@ -745,11 +746,15 @@ int interpret_nth_last_branch(const char *name, struct strbuf *buf)
cb.buf = buf;
for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
if (cb.nth < nth)
return 0;
cb.counting = 0;
cb.nth -= nth;
cb.buf = buf;
for_each_reflog_ent("HEAD", grab_nth_branch_switch, &cb);
return 0;
return brace-name+1;
}
/*