remove required gdate dependency

2 files changed, 22 insertions, 10 deletions

diff --git a/DEVELOPER_GUIDE.txt b/DEVELOPER_GUIDE.txt
index 5869257..b878a72 100644
--- a/DEVELOPER_GUIDE.txt
+++ b/DEVELOPER_GUIDE.txt
@@ -38,3 +38,4 @@ We strongly suggest well polished PRs, but don't want to stall improvements
 by discussions about minor flaws. As long as the PR does not break anything and
 improves the product, we should merge it, polishing remaining things afterwards.
 
+On OSX `brew install coreutils` to have gdate and get nanosecond timings during bash script.
diff --git a/cbt b/cbt
index 5d02917..0c5eaca 100755
--- a/cbt
+++ b/cbt
@@ -8,12 +8,27 @@
 # - reduction of dependencies
 # - performance improvements
 
-start_seconds=$(gdate +"%s")
-start_nanos=1$(gdate +"%N")
+seconds() {
+	date +"%s"
+}
+
+nanos() {
+	n=$(date +"%N")
+	if [ "$n" = "N" ]; then
+		n=$(gdate +"%N" 2>/dev/null)
+	fi
+	if [ "$n" = "" ]; then
+		n="0"
+	fi
+	echo $n
+}
+
+start_seconds=$(seconds)
+start_nanos=1$(nanos)
 
 time_taken() {
-	i=$(( $(gdate +"%s") - start_seconds ))
-	n=$(( $(( 1$(gdate +"%N") - start_nanos )) / 1000000 ))
+	i=$(( $(seconds) - start_seconds ))
+	n=$(( $(( 1$(nanos) - start_nanos )) / 1000000 ))
 	if [[ ( "$n" < 0 ) ]]; then
 		i=$(( i-1 ))
 		n=$(( n+1000 ))
@@ -33,12 +48,8 @@ log () {
 		shift
 	done
 	if [ $enabled -eq 0 ]; then
-		which gdate 2>&1 > /dev/null
-		gdate_installed=$?
-		if [ $gdate_installed -eq 0 ]; then
-			delta=$(time_taken)
-			echo "[$delta] $msg" 1>&2
-		fi
+		delta=$(time_taken)
+		echo "[$delta] $msg" 1>&2
 	fi
 }