Make the check-source test more generic.

Makefile.am

@@ -31,4 +31,6 @@ update-fonts: tools/makefont
 	tools/makefont mono9 "Monospace 9" 96 4 >| $(srcdir)/caca/mono9.data
 	tools/makefont monobold12 "Monospace Bold 12" 96 4 >| $(srcdir)/caca/monobold12.data
 
+echo-dirs: ; echo caca kernel src cxx examples ruby tools
+
 FORCE:

test/check-source

@@ -6,10 +6,11 @@
 nfails=0
 nfiles=0
 nlines=0
-for dir in caca kernel src cxx examples ruby tools; do
+for dir in $(make -s echo-dirs -C ..); do
+  if [ ! -d "../$dir" ]; then continue; fi
   for x in $(make -s echo-sources -C ../$dir); do
     case "$x" in
-      *.c|*.cpp|*.h|*.m)
+      *.c|*.cpp|*.h|*.m|*.php|*.cs|*.java|.py|.pl)
         nfiles=$(($nfiles + 1));
         nlines=$(($nlines + `grep -c . "../$dir/$x"`)) ;;
       *)