All of these options do the same thing "--foo" iterates over
the "foo" refs, and "--foo=<glob>" does the same with a
glob. We can factor this into its own function to avoid
repeating ourselves.

There are two subtleties to note:

  - the original called for_each_branch_ref(), etc, in the
    non-glob case. Now we will call for_each_ref_in("refs/heads/")
    which is exactly what for_each_branch_ref() did under
    the hood.

  - for --glob, we'll call for_each_glob_ref_in() with a
    NULL "prefix" argument. Which is exactly what
    for_each_glob_ref() was doing already.

So both cases should behave identically, and it seems
reasonable to assume that this will remain the same. The
functions we are calling now are the more-generic ones, and
the ones we are dropping are just convenience wrappers.

Signed-off-by: Jeff King <p...@peff.net>
---
This actually drops the last caller for for_each_branch_ref(). I'm not
sure if we shoulder consider cleaning up the proliferation of
for_each_ref() helpers.

 builtin/rev-parse.c | 45 ++++++++++++++++-----------------------------
 1 file changed, 16 insertions(+), 29 deletions(-)

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index db1417160..76be91350 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -554,6 +554,15 @@ static int opt_with_value(const char *arg, const char 
*opt, const char **value)
        return 0;
 }
 
+static void handle_ref_opt(const char *pattern, const char *prefix)
+{
+       if (pattern)
+               for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
+       else
+               for_each_ref_in(prefix, show_reference, NULL);
+       clear_ref_exclusion(&ref_excludes);
+}
+
 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 {
        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
@@ -749,42 +758,20 @@ int cmd_rev_parse(int argc, const char **argv, const char 
*prefix)
                                for_each_ref_in("refs/bisect/good", 
anti_reference, NULL);
                                continue;
                        }
-                       if (skip_prefix(arg, "--branches=", &arg)) {
-                               for_each_glob_ref_in(show_reference, arg,
-                                       "refs/heads/", NULL);
-                               clear_ref_exclusion(&ref_excludes);
-                               continue;
-                       }
-                       if (!strcmp(arg, "--branches")) {
-                               for_each_branch_ref(show_reference, NULL);
-                               clear_ref_exclusion(&ref_excludes);
-                               continue;
-                       }
-                       if (skip_prefix(arg, "--tags=", &arg)) {
-                               for_each_glob_ref_in(show_reference, arg,
-                                       "refs/tags/", NULL);
-                               clear_ref_exclusion(&ref_excludes);
+                       if (opt_with_value(arg, "--branches", &arg)) {
+                               handle_ref_opt(arg, "refs/heads/");
                                continue;
                        }
-                       if (!strcmp(arg, "--tags")) {
-                               for_each_tag_ref(show_reference, NULL);
-                               clear_ref_exclusion(&ref_excludes);
+                       if (opt_with_value(arg, "--tags", &arg)) {
+                               handle_ref_opt(arg, "refs/tags/");
                                continue;
                        }
                        if (skip_prefix(arg, "--glob=", &arg)) {
-                               for_each_glob_ref(show_reference, arg, NULL);
-                               clear_ref_exclusion(&ref_excludes);
-                               continue;
-                       }
-                       if (skip_prefix(arg, "--remotes=", &arg)) {
-                               for_each_glob_ref_in(show_reference, arg,
-                                       "refs/remotes/", NULL);
-                               clear_ref_exclusion(&ref_excludes);
+                               handle_ref_opt(arg, NULL);
                                continue;
                        }
-                       if (!strcmp(arg, "--remotes")) {
-                               for_each_remote_ref(show_reference, NULL);
-                               clear_ref_exclusion(&ref_excludes);
+                       if (opt_with_value(arg, "--remotes", &arg)) {
+                               handle_ref_opt(arg, "refs/remotes/");
                                continue;
                        }
                        if (skip_prefix(arg, "--exclude=", &arg)) {
-- 
2.12.0.613.g6e7c52a0d

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