tg.sh: branch_contains(): Using -z instead of wc is faster in the common case

diff --git a/tg.sh b/tg.sh
index ae3dcda6446709183cf2f1032777f41655149a57..54b7875a39673886ef3abde6908922d512f0873f 100644 (file)
--- 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...]