From 4531e6e09d55e9e614d3f1701f2e489a8fac29c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johan=20Fiti=C3=A9?= <jfitie@gmail.com>
Date: Wed, 17 Jun 2020 07:20:58 +0000
Subject: Improve color support script

---
 navit/navit_layout_car_convertrgbfordark.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/navit/navit_layout_car_convertrgbfordark.sh b/navit/navit_layout_car_convertrgbfordark.sh
index 5d923ac5d..3d4e5daf6 100755
--- a/navit/navit_layout_car_convertrgbfordark.sh
+++ b/navit/navit_layout_car_convertrgbfordark.sh
@@ -1,3 +1,7 @@
 #!/bin/bash
-echo Light: $1
-echo Dark:\  $(printf '%02x' $(echo $(printf "%d" 0x${1:0:2})/34 | bc))$(printf '%02x' $(echo $(printf "%d" 0x${1:2:2})/8 | bc))$(printf '%02x' $(echo $(printf "%d" 0x${1:4:2})/9 | bc))
+if [[ $1 =~ ^[0-9a-fA-F]{6}$ ]]; then
+  echo Light: $1
+  echo Dark:\  $(printf '%02x' $(echo $(printf "%d" 0x${1:0:2})/34 | bc))$(printf '%02x' $(echo $(printf "%d" 0x${1:2:2})/8 | bc))$(printf '%02x' $(echo $(printf "%d" 0x${1:4:2})/9 | bc))
+else
+  echo Usage: $0 RRGGBB
+fi
-- 
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