Support 'master@2 hours ago' syntax

[git.git] / sha1_name.c

diff --git a/sha1_name.c b/sha1_name.c
index dc68355..3ac3ab4 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -4,6 +4,7 @@
 #include "tree.h"
 #include "blob.h"
 #include "tree-walk.h"
+#include "refs.h"
 
 static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
 {
@@ -245,36 +246,60 @@ static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
                "refs/remotes/%.*s/HEAD",
                NULL
        };
-       const char **p;
-       const char *warning = "warning: refname '%.*s' is ambiguous.\n";
-       char *pathname;
-       int already_found = 0;
+       static const char *warning = "warning: refname '%.*s' is ambiguous.\n";
+       const char **p, *pathname;
+       char *real_path = NULL;
+       int refs_found = 0, at_mark;
+       unsigned long at_time = (unsigned long)-1;
        unsigned char *this_result;
        unsigned char sha1_from_ref[20];
 
        if (len == 40 && !get_sha1_hex(str, sha1))
                return 0;
 
+       /* At a given period of time? "@2 hours ago" */
+       for (at_mark = 1; at_mark < len; at_mark++) {
+               if (str[at_mark] == '@') {
+                       int date_len = len - at_mark - 1;
+                       char *date_spec = xmalloc(date_len + 1);
+                       strncpy(date_spec, str + at_mark + 1, date_len);
+                       date_spec[date_len] = 0;
+                       at_time = approxidate(date_spec);
+                       free(date_spec);
+                       len = at_mark;
+               }
+       }
+
        /* Accept only unambiguous ref paths. */
        if (ambiguous_path(str, len))
                return -1;
 
        for (p = fmt; *p; p++) {
-               this_result = already_found ? sha1_from_ref : sha1;
-               pathname = git_path(*p, len, str);
-               if (!read_ref(pathname, this_result)) {
-                       if (warn_ambiguous_refs) {
-                               if (already_found)
-                                       fprintf(stderr, warning, len, str);
-                               already_found++;
-                       }
-                       else
-                               return 0;
+               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 = strdup(pathname);
+                       if (!warn_ambiguous_refs)
+                               break;
                }
        }
-       if (already_found)
-               return 0;
-       return -1;
+
+       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);
+       }
+
+       free(real_path);
+       return 0;
 }
 
 static int get_sha1_1(const char *name, int len, unsigned char *sha1);