file names containing -r do not trigger colorizing

lesspipe.sh

@@ -367,10 +367,10 @@ analyze_args () {
 	# return if we want to watch growing files
 	[[ $lessarg == *less\ *\ +F\ * || $lessarg == *less\ *\ : ]] && exit 0
 	# color is set when calling less with -r or -R or LESS contains that option
-	lessarg="$LESS $lessarg"
-	lessarg=`echo $lessarg|sed 's/-[a-zA-Z]*[rR]/-r/'`
+	lessarg="l $LESS $lessarg"
+	lessarg=`echo $lessarg|sed 's/ -[a-zA-Z]*[rR]/ -r/'`
 	has_cmd tput && colors=$(tput colors) || colors=0
-	if [[ $colors -ge 8 && $lessarg == *-[rR]* ]]; then
+	if [[ $colors -ge 8 && $lessarg == *\ -[rR]* ]]; then
 		COLOR="--color=always"
 	else
 		COLOR="--color=auto"

test.pl

@@ -433,6 +433,10 @@ sub comp {
 diff -u $T/tests/t.eclass $T/tests/test.c|less - :diff # unified diff piped through less works git #11
 c test=a
 ### github issues (solved and unsolved) and other test cases
+less $T/tests/a-r-R.pl		# do not call vimcolor with -l extension git #77
+c sub
+LESS= less $T/tests/a-r-R.pl		# name contains -r or -R git #78
+= sub test {}
 less $T/tests/test_zip:non-existent-file	# nonexisting file in a zip archive git issue #1
 = 
 less $T/tests/test\ \;\'\"\[\(\{ok		# file name with chars such as ", ' ...