Improve initialization

Cleaned up and improved the initialization code, fixing a couple of
errors reported by the checkcolors.vim script. The script now requires
that tCo be set to at least 256 and checks whether syntax highlighting
is enabled before issuing “syntax reset”.

1 files changed, 8 insertions, 3 deletions

diff --git a/colors/btl.vim b/colors/btl.vim
index 9fcf99b..d4c53f6 100644
--- a/colors/btl.vim
+++ b/colors/btl.vim
@@ -10,12 +10,17 @@
 " - Add unset groups, esp. diff, quickfix window
 " - Consider adding some toggleable, subtle, grayscale syntax highlighting.
 
-let g:colors_name="btl"
-
-syntax reset
+if &t_Co < 256
+    echoerr "Colorscheme requires 256-color terminal"
+endif
 
 set background=dark
 highlight clear
+if exists("syntax_on")
+    syntax reset
+endif
+
+let g:colors_name="btl"
 
 " Grayscale colors used here:
 "