Make "git rev-list" be a builtin

diff --git a/sha1_name.c b/sha1_name.c
index 35e8dfb9c7beddab116c77b44e4da8ed1b41c995..dc6835520ccfd4838b47a4af81ccf139f55e1801 100644 (file)
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -3,7 +3,7 @@
 #include "commit.h"
 #include "tree.h"
 #include "blob.h"
-#include "diff.h"
+#include "tree-walk.h"
 
 static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
 {
@@ -450,58 +450,6 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1)
        return get_short_sha1(name, len, sha1, 0);
 }
 
-static int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *);
-
-static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
-{
-       int namelen = strlen(name);
-       while (t->size) {
-               const char *entry;
-               const unsigned char *sha1;
-               int entrylen, cmp;
-
-               sha1 = tree_entry_extract(t, &entry, mode);
-               update_tree_entry(t);
-               entrylen = strlen(entry);
-               if (entrylen > namelen)
-                       continue;
-               cmp = memcmp(name, entry, entrylen);
-               if (cmp > 0)
-                       continue;
-               if (cmp < 0)
-                       break;
-               if (entrylen == namelen) {
-                       memcpy(result, sha1, 20);
-                       return 0;
-               }
-               if (name[entrylen] != '/')
-                       continue;
-               if (!S_ISDIR(*mode))
-                       break;
-               if (++entrylen == namelen) {
-                       memcpy(result, sha1, 20);
-                       return 0;
-               }
-               return get_tree_entry(sha1, name + entrylen, result, mode);
-       }
-       return -1;
-}
-
-static int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode)
-{
-       int retval;
-       void *tree;
-       struct tree_desc t;
-
-       tree = read_object_with_reference(tree_sha1, tree_type, &t.size, NULL);
-       if (!tree)
-               return -1;
-       t.buf = tree;
-       retval = find_tree_entry(&t, name, sha1, mode);
-       free(tree);
-       return retval;
-}
-
 /*
  * This is like "get_sha1_basic()", except it allows "sha1 expressions",
  * notably "xyz^" for "parent of xyz"
@@ -510,17 +458,56 @@ int get_sha1(const char *name, unsigned char *sha1)
 {
        int ret;
        unsigned unused;
+       int namelen = strlen(name);
+       const char *cp;
 
        prepare_alt_odb();
-       ret = get_sha1_1(name, strlen(name), sha1);
-       if (ret < 0) {
-               const char *cp = strchr(name, ':');
-               if (cp) {
-                       unsigned char tree_sha1[20];
-                       if (!get_sha1_1(name, cp-name, tree_sha1))
-                               return get_tree_entry(tree_sha1, cp+1, sha1,
-                                                     &unused);
+       ret = get_sha1_1(name, namelen, sha1);
+       if (!ret)
+               return ret;
+       /* sha1:path --> object name of path in ent sha1
+        * :path -> object name of path in index
+        * :[0-3]:path -> object name of path in index at stage
+        */
+       if (name[0] == ':') {
+               int stage = 0;
+               struct cache_entry *ce;
+               int pos;
+               if (namelen < 3 ||
+                   name[2] != ':' ||
+                   name[1] < '0' || '3' < name[1])
+                       cp = name + 1;
+               else {
+                       stage = name[1] - '0';
+                       cp = name + 3;
+               }
+               namelen = namelen - (cp - name);
+               if (!active_cache)
+                       read_cache();
+               if (active_nr < 0)
+                       return -1;
+               pos = cache_name_pos(cp, namelen);
+               if (pos < 0)
+                       pos = -pos - 1;
+               while (pos < active_nr) {
+                       ce = active_cache[pos];
+                       if (ce_namelen(ce) != namelen ||
+                           memcmp(ce->name, cp, namelen))
+                               break;
+                       if (ce_stage(ce) == stage) {
+                               memcpy(sha1, ce->sha1, 20);
+                               return 0;
+                       }
+                       pos++;
                }
+               return -1;
+       }
+       cp = strchr(name, ':');
+       if (cp) {
+               unsigned char tree_sha1[20];
+               if (!get_sha1_1(name, cp-name, tree_sha1))
+                       return get_tree_entry(tree_sha1, cp+1, sha1,
+                                             &unused);
        }
        return ret;
 }