X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=tg.sh;h=56c5709f1d8f319e7d356d1b0fe9f0880cf98fed;hb=73e98b616e3d87f0196dc860287d8b65efce864a;hp=ae3dcda6446709183cf2f1032777f41655149a57;hpb=308892d0c071135031994606170c8be6653e7197;p=topgit.git

diff --git a/tg.sh b/tg.sh
index ae3dcda..56c5709 100644
--- a/tg.sh
+++ b/tg.sh
@@ -76,7 +76,7 @@ measure_branch()
 # Whether B1 is a superset of B2.
 branch_contains()
 {
-	[ "$(git rev-list ^"$1" "$2" | wc -l)" -eq 0 ]
+	[ -z "$(git rev-list ^"$1" "$2")" ]
 }
 
 # needs_update NAME [BRANCHPATH...]
@@ -112,6 +112,12 @@ needs_update()
 	} || : # $1 is not tracked by TopGit anymore
 }
 
+# branch_empty NAME
+branch_empty()
+{
+	[ -z "$(git diff-tree "refs/top-bases/$1" "$1" | fgrep -v "	.top")" ]
+}
+
 # switch_to_base NAME [SEED]
 switch_to_base()
 {