Merge branch 'pw/rebase-i-regression-fix-tests'
[gitweb.git] / builtin / name-rev.c
index e7a3fe7ee70759c34b9de12177078a55f27bfb9a..e21715f1d0874171bcda2486adb4d27ea5cbbc99 100644 (file)
@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "cache.h"
+#include "config.h"
 #include "commit.h"
 #include "tag.h"
 #include "refs.h"
 
 typedef struct rev_name {
        const char *tip_name;
-       unsigned long taggerdate;
+       timestamp_t taggerdate;
        int generation;
        int distance;
+       int from_tag;
 } rev_name;
 
-static long cutoff = LONG_MAX;
+static timestamp_t cutoff = TIME_MAX;
 
 /* How many generations are maximally preferred over _one_ merge traversal? */
 #define MERGE_TRAVERSAL_WEIGHT 65535
 
+static int is_better_name(struct rev_name *name,
+                         const char *tip_name,
+                         timestamp_t taggerdate,
+                         int generation,
+                         int distance,
+                         int from_tag)
+{
+       /*
+        * When comparing names based on tags, prefer names
+        * based on the older tag, even if it is farther away.
+        */
+       if (from_tag && name->from_tag)
+               return (name->taggerdate > taggerdate ||
+                       (name->taggerdate == taggerdate &&
+                        name->distance > distance));
+
+       /*
+        * We know that at least one of them is a non-tag at this point.
+        * favor a tag over a non-tag.
+        */
+       if (name->from_tag != from_tag)
+               return from_tag;
+
+       /*
+        * We are now looking at two non-tags.  Tiebreak to favor
+        * shorter hops.
+        */
+       if (name->distance != distance)
+               return name->distance > distance;
+
+       /* ... or tiebreak to favor older date */
+       if (name->taggerdate != taggerdate)
+               return name->taggerdate > taggerdate;
+
+       /* keep the current one if we cannot decide */
+       return 0;
+}
+
 static void name_rev(struct commit *commit,
-               const char *tip_name, unsigned long taggerdate,
-               int generation, int distance,
+               const char *tip_name, timestamp_t taggerdate,
+               int generation, int distance, int from_tag,
                int deref)
 {
        struct rev_name *name = (struct rev_name *)commit->util;
@@ -46,14 +86,14 @@ static void name_rev(struct commit *commit,
                name = xmalloc(sizeof(rev_name));
                commit->util = name;
                goto copy_data;
-       } else if (name->taggerdate > taggerdate ||
-                       (name->taggerdate == taggerdate &&
-                        name->distance > distance)) {
+       } else if (is_better_name(name, tip_name, taggerdate,
+                                 generation, distance, from_tag)) {
 copy_data:
                name->tip_name = tip_name;
                name->taggerdate = taggerdate;
                name->generation = generation;
                name->distance = distance;
+               name->from_tag = from_tag;
        } else {
                free(to_free);
                return;
@@ -75,10 +115,12 @@ static void name_rev(struct commit *commit,
                                                   parent_number);
 
                        name_rev(parents->item, new_name, taggerdate, 0,
-                               distance + MERGE_TRAVERSAL_WEIGHT, 0);
+                                distance + MERGE_TRAVERSAL_WEIGHT,
+                                from_tag, 0);
                } else {
                        name_rev(parents->item, tip_name, taggerdate,
-                               generation + 1, distance + 1, 0);
+                                generation + 1, distance + 1,
+                                from_tag, 0);
                }
        }
 }
@@ -117,7 +159,7 @@ struct name_ref_data {
 
 static struct tip_table {
        struct tip_table_entry {
-               unsigned char sha1[20];
+               struct object_id oid;
                const char *refname;
        } *table;
        int nr;
@@ -125,13 +167,13 @@ static struct tip_table {
        int sorted;
 } tip_table;
 
-static void add_to_tip_table(const unsigned char *sha1, const char *refname,
+static void add_to_tip_table(const struct object_id *oid, const char *refname,
                             int shorten_unambiguous)
 {
        refname = name_ref_abbrev(refname, shorten_unambiguous);
 
        ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
-       hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
+       oidcpy(&tip_table.table[tip_table.nr].oid, oid);
        tip_table.table[tip_table.nr].refname = xstrdup(refname);
        tip_table.nr++;
        tip_table.sorted = 0;
@@ -140,16 +182,16 @@ static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 static int tipcmp(const void *a_, const void *b_)
 {
        const struct tip_table_entry *a = a_, *b = b_;
-       return hashcmp(a->sha1, b->sha1);
+       return oidcmp(&a->oid, &b->oid);
 }
 
 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
 {
-       struct object *o = parse_object(oid->hash);
+       struct object *o = parse_object(oid);
        struct name_ref_data *data = cb_data;
        int can_abbreviate_output = data->tags_only && data->name_only;
        int deref = 0;
-       unsigned long taggerdate = ULONG_MAX;
+       timestamp_t taggerdate = TIME_MAX;
 
        if (data->tags_only && !starts_with(path, "refs/tags/"))
                return 0;
@@ -197,21 +239,25 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
                        return 0;
        }
 
-       add_to_tip_table(oid->hash, path, can_abbreviate_output);
+       add_to_tip_table(oid, path, can_abbreviate_output);
 
        while (o && o->type == OBJ_TAG) {
                struct tag *t = (struct tag *) o;
                if (!t->tagged)
                        break; /* broken repository */
-               o = parse_object(t->tagged->oid.hash);
+               o = parse_object(&t->tagged->oid);
                deref = 1;
                taggerdate = t->date;
        }
        if (o && o->type == OBJ_COMMIT) {
                struct commit *commit = (struct commit *)o;
+               int from_tag = starts_with(path, "refs/tags/");
 
+               if (taggerdate == ULONG_MAX)
+                       taggerdate = ((struct commit *)o)->date;
                path = name_ref_abbrev(path, can_abbreviate_output);
-               name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref);
+               name_rev(commit, xstrdup(path), taggerdate, 0, 0,
+                        from_tag, deref);
        }
        return 0;
 }
@@ -219,7 +265,7 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 {
        struct tip_table_entry *table = table_;
-       return table[ix].sha1;
+       return table[ix].oid.hash;
 }
 
 static const char *get_exact_ref_match(const struct object *o)
@@ -304,9 +350,9 @@ static void name_rev_line(char *p, struct name_ref_data *data)
 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
                if (!ishex(*p))
                        forty = 0;
-               else if (++forty == 40 &&
+               else if (++forty == GIT_SHA1_HEXSZ &&
                         !ishex(*(p+1))) {
-                       unsigned char sha1[40];
+                       struct object_id oid;
                        const char *name = NULL;
                        char c = *(p+1);
                        int p_len = p - p_start + 1;
@@ -314,9 +360,9 @@ static void name_rev_line(char *p, struct name_ref_data *data)
                        forty = 0;
 
                        *(p+1) = 0;
-                       if (!get_sha1(p - 39, sha1)) {
+                       if (!get_oid(p - (GIT_SHA1_HEXSZ - 1), &oid)) {
                                struct object *o =
-                                       lookup_object(sha1);
+                                       lookup_object(oid.hash);
                                if (o)
                                        name = get_rev_name(o, &buf);
                        }
@@ -326,7 +372,7 @@ static void name_rev_line(char *p, struct name_ref_data *data)
                                continue;
 
                        if (data->name_only)
-                               printf("%.*s%s", p_len - 40, p_start, name);
+                               printf("%.*s%s", p_len - GIT_SHA1_HEXSZ, p_start, name);
                        else
                                printf("%.*s (%s)", p_len, p_start, name);
                        p_start = p + 1;
@@ -377,18 +423,18 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
                cutoff = 0;
 
        for (; argc; argc--, argv++) {
-               unsigned char sha1[20];
+               struct object_id oid;
                struct object *object;
                struct commit *commit;
 
-               if (get_sha1(*argv, sha1)) {
+               if (get_oid(*argv, &oid)) {
                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
                                        *argv);
                        continue;
                }
 
                commit = NULL;
-               object = parse_object(sha1);
+               object = parse_object(&oid);
                if (object) {
                        struct object *peeled = deref_tag(object, *argv, 0);
                        if (peeled && peeled->type == OBJ_COMMIT)