create_symref: modernize variable names

Once upon a time, create_symref() was used only to point
HEAD at a branch name, and the variable names reflect that
(e.g., calling the path git_HEAD). However, it is much more
generic these days (and has been for some time). Let's
update the variable names to make it easier to follow:

  - `ref_target` is now just `refname`. This is closer to
    the `ref` that is already in `cache.h`, but with the
    extra twist that "name" makes it clear this is the name
    and not a ref struct. Dropping "target" hopefully makes
    it clear that we are talking about the symref itself,
    not what it points to.

  - `git_HEAD` is now `ref_path`; the on-disk path
    corresponding to `ref`.

  - `refs_heads_master` is now just `target`; i.e., what the
    symref points at. This term also matches what is in
    the symlink(2) manpage (at least on Linux).

  - the buffer to hold the symref file's contents was simply
    called `ref`. It's now `buf` (admittedly also generic,
    but at least not actively introducing confusion with the
    other variable holding the refname).

Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/refs.h b/refs.h
index 7a04077..3c3da29 100644
--- a/refs.h
+++ b/refs.h
@@ -292,7 +292,7 @@ extern char *shorten_unambiguous_ref(const char *refname, int strict);
 /** rename ref, return 0 on success **/
 extern int rename_ref(const char *oldref, const char *newref, const char *logmsg);
 
-extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
+extern int create_symref(const char *refname, const char *target, const char *logmsg);
 
 enum action_on_err {
 	UPDATE_REFS_MSG_ON_ERR,