Added tmux-is-at-least method for version checking

Author: docwhat

scripts/helpers.sh

@@ -42,3 +42,31 @@ get_engine() {
 	local engine_var="$1"
 	tmux show-options -g | grep -i "^@open-$engine_var" | cut -d ' ' -f2 | xargs
 }
+
+tmux_version="$(tmux -V | cut -d ' ' -f 2)"
+tmux-is-at-least() {
+	if [[ $tmux_version == $1 ]]
+	then
+		return 0
+	fi
+
+	local IFS=.
+	local i tver=($tmux_version) wver=($1)
+
+	# fill empty fields in tver with zeros
+	for ((i=${#tver[@]}; i<${#wver[@]}; i++)); do
+		tver[i]=0
+	done
+
+	# fill empty fields in wver with zeros
+	for ((i=${#wver[@]}; i<${#tver[@]}; i++)); do
+		wver[i]=0
+	done
+
+	for ((i=0; i<${#tver[@]}; i++)); do
+		if ((10#${tver[i]} < 10#${wver[i]})); then
+			return 1
+		fi
+	done
+	return 0
+}