Feat: interpolate colors (#208)

* feat: interpolate theme colors

* doc: add interpolated colors to readme

utils/interpolate_utils.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+do_color_interpolation() {
+	local all_interpolated="$1"
+
+	for ((i=0; i<${#color_interpolation[@]}; i++)); do
+		all_interpolated=${all_interpolated//${color_interpolation[$i]}/${color_values[$i]}}
+	done
+
+	echo "$all_interpolated"
+}

utils/tmux_utils.sh

@@ -22,6 +22,27 @@ get_tmux_option() {
   fi
 }
 
+get_interpolated_tmux_option() {
+  local option value default
+  option="$1"
+  default="$2"
+  value=$(tmux show-option -gqv "$option")
+
+  if [ -n "$value" ]
+  then
+    if [ "$value" = "null" ]
+    then
+      echo ""
+
+    else
+      do_color_interpolation "$value"
+    fi
+
+  else
+    echo "$default"
+  fi
+}
+
 set() {
   local option=$1
   local value=$2