Minor fast-import documentation corrections.

diff --git a/sha1_name.c b/sha1_name.c
index ed711f2079752fd7ecc24b1a48b7d6fcc256659f..9dfb3ac57403793e6c6f78f2f75fb61c0a56c4bc 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -157,7 +157,7 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
        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);
@@ -235,7 +235,7 @@ static int ambiguous_path(const char *path, int len)
        return slash;
 }
 
-static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
 {
        static const char *fmt[] = {
                "%.*s",
@@ -246,27 +246,45 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
                "refs/remotes/%.*s/HEAD",
                NULL
        };
+       const char **p, *r;
+       int refs_found = 0;
+
+       *ref = NULL;
+       for (p = 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 get_sha1_basic(const char *str, int len, unsigned char *sha1)
+{
        static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
-       const char **p, *ref;
        char *real_ref = NULL;
-       int refs_found = 0, am;
-       unsigned long at_time = (unsigned long)-1;
-       unsigned char *this_result;
-       unsigned char sha1_from_ref[20];
+       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 = 1; at < len - 1; at++) {
+                       if (str[at] == '@' && str[at+1] == '{') {
+                               reflog_len = (len-1) - (at+2);
+                               len = at;
+                               break;
+                       }
                }
        }
 
@@ -274,16 +292,7 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
        if (ambiguous_path(str, len))
                return -1;
 
-       for (p = fmt; *p; p++) {
-               this_result = refs_found ? sha1_from_ref : sha1;
-               ref = resolve_ref(mkpath(*p, len, str), this_result, 1, NULL);
-               if (ref) {
-                       if (!refs_found++)
-                               real_ref = xstrdup(ref);
-                       if (!warn_ambiguous_refs)
-                               break;
-               }
-       }
+       refs_found = dwim_ref(str, len, sha1, &real_ref);
 
        if (!refs_found)
                return -1;
@@ -291,11 +300,36 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
        if (warn_ambiguous_refs && refs_found > 1)
                fprintf(stderr, warning, len, str);
 
-       if (at_time != (unsigned long)-1) {
-               read_ref_at(
-                       real_ref,
-                       at_time,
-                       sha1);
+       if (reflog_len) {
+               /* Is it asking for N-th entry, or approxidate? */
+               int nth, i;
+               unsigned long at_time;
+               unsigned long co_time;
+               int co_tz, co_cnt;
+
+               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_ref);