refs.c: move dwim_ref()/dwim_log() from sha1_name.c

Both dwim_ref()/dwim_log() functions are intimately related to the ref
parsing rules defined in refs.c and better fits there. Move them together
with substitute_branch_name(), a file scope static helper function.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/refs.c b/refs.c
index 832a52f781..e3692bd3d8 100644
--- a/refs.c
+++ b/refs.c
@@ -1067,6 +1067,91 @@ static int is_refname_available(const char *ref, const char *oldref,
 	return 1;
 }
 
+/*
+ * *string and *len will only be substituted, and *string returned (for
+ * later free()ing) if the string passed in is a magic short-hand form
+ * to name a branch.
+ */
+static char *substitute_branch_name(const char **string, int *len)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int ret = interpret_branch_name(*string, &buf);
+
+	if (ret == *len) {
+		size_t size;
+		*string = strbuf_detach(&buf, &size);
+		*len = size;
+		return (char *)*string;
+	}
+
+	return NULL;
+}
+
+int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
+{
+	char *last_branch = substitute_branch_name(&str, &len);
+	const char **p, *r;
+	int refs_found = 0;
+
+	*ref = NULL;
+	for (p = ref_rev_parse_rules; *p; p++) {
+		char fullref[PATH_MAX];
+		unsigned char sha1_from_ref[20];
+		unsigned char *this_result;
+		int flag;
+
+		this_result = refs_found ? sha1_from_ref : sha1;
+		mksnpath(fullref, sizeof(fullref), *p, len, str);
+		r = resolve_ref(fullref, this_result, 1, &flag);
+		if (r) {
+			if (!refs_found++)
+				*ref = xstrdup(r);
+			if (!warn_ambiguous_refs)
+				break;
+		} else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD"))
+			warning("ignoring dangling symref %s.", fullref);
+	}
+	free(last_branch);
+	return refs_found;
+}
+
+int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
+{
+	char *last_branch = substitute_branch_name(&str, &len);
+	const char **p;
+	int logs_found = 0;
+
+	*log = NULL;
+	for (p = ref_rev_parse_rules; *p; p++) {
+		struct stat st;
+		unsigned char hash[20];
+		char path[PATH_MAX];
+		const char *ref, *it;
+
+		mksnpath(path, sizeof(path), *p, len, str);
+		ref = resolve_ref(path, hash, 1, NULL);
+		if (!ref)
+			continue;
+		if (!stat(git_path("logs/%s", path), &st) &&
+		    S_ISREG(st.st_mode))
+			it = path;
+		else if (strcmp(ref, path) &&
+			 !stat(git_path("logs/%s", ref), &st) &&
+			 S_ISREG(st.st_mode))
+			it = ref;
+		else
+			continue;
+		if (!logs_found++) {
+			*log = xstrdup(it);
+			hashcpy(sha1, hash);
+		}
+		if (!warn_ambiguous_refs)
+			break;
+	}
+	free(last_branch);
+	return logs_found;
+}
+
 static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
 {
 	char *ref_file;