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[PATCH 2/4] revision: add rev_input_given flag

Normally a caller that invokes setup_revisions() has to
check rev.pending to see if anything was actually queued for
the traversal. But they can't tell the difference between
two cases:

  1. The user gave us no tip from which to start a

  2. The user tried to give us tips via --glob, --all, etc,
     but their patterns ended up being empty.

Let's set a flag in the rev_info struct that callers can use
to tell the difference.  We can set this from the
init_all_refs_cb() function.  That's a little funny because
it's not exactly about initializing the "cb" struct itself.
But that function is the common setup place for doing
pattern traversals that is used by --glob, --all, etc.

Signed-off-by: Jeff King <peff@xxxxxxxx>
 revision.c | 1 +
 revision.h | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/revision.c b/revision.c
index 6603af944..08d5806b8 100644
--- a/revision.c
+++ b/revision.c
@@ -1168,6 +1168,7 @@ static void init_all_refs_cb(struct all_refs_cb *cb, struct rev_info *revs,
 	cb->all_revs = revs;
 	cb->all_flags = flags;
+	revs->rev_input_given = 1;
 void clear_ref_exclusion(struct string_list **ref_excludes_p)
diff --git a/revision.h b/revision.h
index f96e7f7f4..c8f4e91f2 100644
--- a/revision.h
+++ b/revision.h
@@ -71,6 +71,13 @@ struct rev_info {
 	const char *def;
 	struct pathspec prune_data;
+	/*
+	 * Whether the arguments parsed by setup_revisions() included any
+	 * "input" revisions that might still have yielded an empty pending
+	 * list (e.g., patterns like "--all" or "--glob").
+	 */
+	int rev_input_given;
 	/* topo-sort */
 	enum rev_sort_order sort_order;