To name a commit, you can now say
$ git rev-parse ':/Initial revision of "git"'
and it will return the hash of the youngest commit whose
commit message (the oneline) begins with the given prefix.
For future extension, a leading exclamation mark is treated
specially: if you want to match a commit message starting with
a '!', just repeat the exclamation mark. So, to match a commit
which starts with '!Hello World', use
$ git show ':/!!Hello World'
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
This obviously replaces the earlier patch.
Documentation/git-rev-parse.txt | 7 +++++
sha1_name.c | 58 +++++++++++++++++++++++++++++++++++++++
2 files changed, 65 insertions(+), 0 deletions(-)
diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 081b9d6..41b8a51 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -193,6 +193,13 @@ blobs contained in a commit.
and dereference the tag recursively until a non-tag object is
found.
+* A colon, followed by a slash, followed by a text: this names
+ a commit whose commit message starts with the specified text.
+ This name returns the youngest matching commit which is
+ reachable from any ref. If the commit message starts with a
+ '!', you have to repeat that; the special sequence ':/!',
+ followed by something else than '!' is reserved for now.
+
* A suffix ':' followed by a path; this names the blob or tree
at the given path in the tree-ish object named by the part
before the colon.
diff --git a/sha1_name.c b/sha1_name.c
index 2793de9..6ad2662 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -578,6 +578,62 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1)
return get_short_sha1(name, len, sha1, 0);
}
+static int handle_one_ref(const char *path,
+ const unsigned char *sha1, int flag, void *cb_data)
+{
+ struct commit_list **list = cb_data;
+ struct object *object = parse_object(sha1);
+ if (!object)
+ return 0;
+ if (object->type == OBJ_TAG)
+ object = deref_tag(object, path, strlen(path));
+ if (object->type != OBJ_COMMIT)
+ return 0;
+ insert_by_date((struct commit *)object, list);
+ return 0;
+}
+
+/*
+ * This interprets names like ':/Initial revision of "git"' by searching
+ * through history and returning the first commit whose message starts
+ * with the given string.
+ *
+ * For future extension, ':/!' is reserved. If you want to match a message
+ * beginning with a '!', you have to repeat the exclamation mark.
+ */
+
+#define ONELINE_SEEN (1u<<20)
+int get_sha1_oneline(const char *prefix, unsigned char *sha1)
+{
+ struct commit_list *list = NULL, *backup = NULL, *l;
+ struct commit *commit;
+
+ if (prefix[0] == '!') {
+ if (prefix[1] != '!')
+ die ("Invalid search pattern: %s", prefix);
+ prefix++;
+ }
+ if (!save_commit_buffer)
+ return error("Could not expand oneline-name.");
+ for_each_ref(handle_one_ref, &list);
+ for (l = list; l; l = l->next)
+ commit_list_insert(l->item, &backup);
+ while ((commit = pop_most_recent_commit(&list, ONELINE_SEEN))) {
+ char *p;
+ parse_object(commit->object.sha1);
+ if (!commit->buffer || !(p = strstr(commit->buffer, "\n\n")))
+ continue;
+ if (!prefixcmp(p + 2, prefix)) {
+ hashcpy(sha1, commit->object.sha1);
+ break;
+ }
+ }
+ free_commit_list(list);
+ for (l = backup; l; l = l->next)
+ clear_commit_marks(l->item, ONELINE_SEEN);
+ return commit == NULL;
+}
+
/*
* This is like "get_sha1_basic()", except it allows "sha1 expressions",
* notably "xyz^" for "parent of xyz"
@@ -601,6 +657,8 @@ int get_sha1(const char *name, unsigned char *sha1)
int stage = 0;
struct cache_entry *ce = NULL;
int pos;
+ if (namelen > 2 && name[1] == '/')
+ return get_sha1_oneline(name + 2, sha1);
if (namelen < 3 ||
name[2] != ':' ||
name[1] < '0' || '3' < name[1])
--
1.5.0.1.2250.g8afc1-dirty
-
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