char canonical[40];
unsigned char res[20];
- if (len < MINIMUM_ABBREV)
+ if (len < MINIMUM_ABBREV || len > 40)
return -1;
hashclr(res);
memset(canonical, 'x', 40);
return slash;
}
+static const char *ref_fmt[] = {
+ "%.*s",
+ "refs/%.*s",
+ "refs/tags/%.*s",
+ "refs/heads/%.*s",
+ "refs/remotes/%.*s",
+ "refs/remotes/%.*s/HEAD",
+ NULL
+};
+
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
+{
+ const char **p, *r;
+ int refs_found = 0;
+
+ *ref = NULL;
+ for (p = ref_fmt; *p; p++) {
+ unsigned char sha1_from_ref[20];
+ unsigned char *this_result;
+
+ this_result = refs_found ? sha1_from_ref : sha1;
+ r = resolve_ref(mkpath(*p, len, str), this_result, 1, NULL);
+ if (r) {
+ if (!refs_found++)
+ *ref = xstrdup(r);
+ if (!warn_ambiguous_refs)
+ break;
+ }
+ }
+ return refs_found;
+}
+
+static int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
+{
+ const char **p;
+ int logs_found = 0;
+
+ *log = NULL;
+ for (p = ref_fmt; *p; p++) {
+ struct stat st;
+ char *path = mkpath(*p, len, str);
+ if (!stat(git_path("logs/%s", path), &st) &&
+ S_ISREG(st.st_mode)) {
+ if (!logs_found++) {
+ *log = xstrdup(path);
+ resolve_ref(path, sha1, 0, NULL);
+ }
+ if (!warn_ambiguous_refs)
+ break;
+ }
+ }
+ return logs_found;
+}
+
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
{
- static const char *fmt[] = {
- "%.*s",
- "refs/%.*s",
- "refs/tags/%.*s",
- "refs/heads/%.*s",
- "refs/remotes/%.*s",
- "refs/remotes/%.*s/HEAD",
- NULL
- };
static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
- const char **p, *pathname;
- char *real_path = NULL;
- int refs_found = 0, am;
- unsigned long at_time = (unsigned long)-1;
- unsigned char *this_result;
- unsigned char sha1_from_ref[20];
+ char *real_ref = NULL;
+ int refs_found = 0;
+ int at, reflog_len;
if (len == 40 && !get_sha1_hex(str, sha1))
return 0;
- /* At a given period of time? "@{2 hours ago}" */
- for (am = 1; am < len - 1; am++) {
- if (str[am] == '@' && str[am+1] == '{' && str[len-1] == '}') {
- int date_len = len - am - 3;
- char *date_spec = xmalloc(date_len + 1);
- strlcpy(date_spec, str + am + 2, date_len + 1);
- at_time = approxidate(date_spec);
- free(date_spec);
- len = am;
- break;
+ /* basic@{time or number} format to query ref-log */
+ reflog_len = at = 0;
+ if (str[len-1] == '}') {
+ for (at = 0; at < len - 1; at++) {
+ if (str[at] == '@' && str[at+1] == '{') {
+ reflog_len = (len-1) - (at+2);
+ len = at;
+ break;
+ }
}
}
/* Accept only unambiguous ref paths. */
- if (ambiguous_path(str, len))
+ if (len && ambiguous_path(str, len))
return -1;
- for (p = fmt; *p; p++) {
- this_result = refs_found ? sha1_from_ref : sha1;
- pathname = resolve_ref(git_path(*p, len, str), this_result, 1);
- if (pathname) {
- if (!refs_found++)
- real_path = xstrdup(pathname);
- if (!warn_ambiguous_refs)
- break;
- }
- }
+ if (!len && reflog_len) {
+ /* allow "@{...}" to mean the current branch reflog */
+ refs_found = dwim_ref("HEAD", 4, sha1, &real_ref);
+ } else if (reflog_len)
+ refs_found = dwim_log(str, len, sha1, &real_ref);
+ else
+ refs_found = dwim_ref(str, len, sha1, &real_ref);
if (!refs_found)
return -1;
if (warn_ambiguous_refs && refs_found > 1)
fprintf(stderr, warning, len, str);
- if (at_time != (unsigned long)-1) {
- read_ref_at(
- real_path + strlen(git_path(".")) - 1,
- at_time,
- sha1);
+ if (reflog_len) {
+ int nth, i;
+ unsigned long at_time;
+ unsigned long co_time;
+ int co_tz, co_cnt;
+
+ /* Is it asking for N-th entry, or approxidate? */
+ for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
+ char ch = str[at+2+i];
+ if ('0' <= ch && ch <= '9')
+ nth = nth * 10 + ch - '0';
+ else
+ nth = -1;
+ }
+ if (0 <= nth)
+ at_time = 0;
+ else
+ at_time = approxidate(str + at + 2);
+ if (read_ref_at(real_ref, at_time, nth, sha1, NULL,
+ &co_time, &co_tz, &co_cnt)) {
+ if (at_time)
+ fprintf(stderr,
+ "warning: Log for '%.*s' only goes "
+ "back to %s.\n", len, str,
+ show_rfc2822_date(co_time, co_tz));
+ else
+ fprintf(stderr,
+ "warning: Log for '%.*s' only has "
+ "%d entries.\n", len, str, co_cnt);
+ }
}
- free(real_path);
+ free(real_ref);
return 0;
}