Through the years the functionality to handle @{-N} and @{u} has moved
around the code, and as a result, code that once made sense, doesn't any
more.
There is no need to call this function recursively with the branch of
@{-N} substituted because dwim_{ref,log} already replaces it.
However, there's one corner-case where @{-N} resolves to a detached
HEAD, in which case we wouldn't get any ref back.
So we parse the nth-prior manually, and deal with it depending on
weather it's a SHA-1, or a ref.
Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
---
sha1_name.c | 30 +++++++++++++++++++-----------
1 file changed, 19 insertions(+), 11 deletions(-)
diff --git a/sha1_name.c b/sha1_name.c
index 0acc6e0..c512c69 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -431,13 +431,14 @@ static inline int upstream_mark(const char *string, int len)
}
static int get_sha1_1(const char *name, int len, unsigned char *sha1, unsigned lookup_flags);
+static int interpret_nth_prior_checkout(const char *name, struct strbuf *buf);
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
{
static const char *warn_msg = "refname '%.*s' is ambiguous.";
char *real_ref = NULL;
int refs_found = 0;
- int at, reflog_len;
+ int at, reflog_len, nth_prior = 0;
if (len == 40 && !get_sha1_hex(str, sha1))
return 0;
@@ -447,6 +448,10 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
if (len && str[len-1] == '}') {
for (at = len-4; at >= 0; at--) {
if (str[at] == '@' && str[at+1] == '{') {
+ if (at == 0 && str[2] == '-') {
+ nth_prior = 1;
+ continue;
+ }
if (!upstream_mark(str + at, len - at)) {
reflog_len = (len-1) - (at+2);
len = at;
@@ -460,19 +465,22 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
if (len && ambiguous_path(str, len))
return -1;
- if (!len && reflog_len) {
+ if (nth_prior) {
struct strbuf buf = STRBUF_INIT;
- int ret;
- /* try the @{-N} syntax for n-th checkout */
- ret = interpret_branch_name(str, &buf);
- if (ret > 0)
- /* substitute this branch name and restart */
- return get_sha1_1(buf.buf, buf.len, sha1, 0);
- else if (ret == 0)
- return -1;
+ int detached;
+
+ if (interpret_nth_prior_checkout(str, &buf) > 0) {
+ detached = (buf.len == 40 && !get_sha1_hex(buf.buf, sha1));
+ strbuf_release(&buf);
+ if (detached)
+ return 0;
+ }
+ }
+
+ if (!len && reflog_len)
/* allow "@{...}" to mean the current branch reflog */
refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
- } else if (reflog_len)
+ else if (reflog_len)
refs_found = dwim_log(str, len, sha1, &real_ref);
else
refs_found = dwim_ref(str, len, sha1, &real_ref);
--
1.8.3.rc0.401.g45bba44
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