simple code golf checker.

check.sh

#!/bin/bash
STDERR=/dev/null
if [ "$1" = '-v' ]; then
	STDERR=/dev/stderr
	shift
fi
if [ $# -lt 1 ]; then
	echo "Usage: $0 [-v] filename ..."
	exit 1
fi

execute() {
	case "$1" in
	*.rb) ruby "$1";;
	*.pl) perl "$1";;
	*.py) python "$1";;
	*.php) php -n -d short_open_tag=true "$1";;
	*.lua) lua "$1";;
	*.c|*.s)
		if [ ! "$1.o" -nt "$1" ]; then
			echo "*** $1: $1.o doesn't exist, recompiling..." > /dev/stderr
			gcc "$1" -o "$1.o" > /dev/stderr || return
		fi
		"$1.o";;
	*.cpp)
		if [ ! "$1.o" -nt "$1" ]; then
			echo "*** $1: $1.o doesn't exist, recompiling..." > /dev/stderr
			g++ "$1" -o "$1.o" > /dev/stderr || return
		fi
		"$1.o";;
	*.d)
		if [ ! "$1.o" -nt "$1" ]; then
			echo "*** $1: $1.o doesn't exist, recompiling..." > /dev/stderr
			gdc "$1" -o "$1.o" > /dev/stderr || return
		fi
		"$1.o";;
	*.ml) ocaml "$1";;
	*.hs) ghc -e main "$1";;
	*.m)
		if [ ! "$1.o" -nt "$1" ]; then
			echo "*** $1: $1.o doesn't exist, recompiling..." > /dev/stderr
			gcc "$1" -o "$1.o" > /dev/stderr || return
		fi
		"$1.o";;
	*.awk) awk -f "$1";;
	*.sed) sed -f "$1";;
	*.sh) bash "$1";;
	*.di)
		MODULENAME="${1/.di/__.d}"
		trap "rm -f $MODULENAME" INT TERM EXIT
		cp "$1" "$MODULENAME"
		gdc $MODULENAME -c -o /dev/null 2> /dev/stdout
		rm -f $MODULENAME
		trap "" INT TERM EXIT;;
	esac
}

EXITCODE=0
for FILE in "$@"; do
	case "$FILE" in *.txt|*.o|*_|_*|*/_*) continue;; esac
	CASENUMBER=1
	FAILED=0
	PREFIX=`dirname $FILE`
	while [ -r $PREFIX/output$CASENUMBER.txt ]; do
		INPUT=$PREFIX/input$CASENUMBER.txt
		OUTPUT=$PREFIX/output$CASENUMBER.txt
		if [ ! -r $INPUT ]; then
			echo
		else
			cat $INPUT |
			python -c 'import sys;sys.stdout.write(sys.stdin.read().rstrip())'
		fi |
			execute $FILE 2> $STDERR |
			python -c 'import sys;sys.stdout.write(sys.stdin.read().rstrip()+"\n")' |
			diff -ur /dev/stdin $OUTPUT || FAILED=1
		CASENUMBER=$(($CASENUMBER+1))
	done
	if [ $FAILED -eq 0 ]; then
	    echo "*** $FILE: SUCCESS (`stat -f '%z' $FILE` bytes)" > /dev/stderr
	else
	    echo "*** $FILE: FAILED" > /dev/stderr
	    EXITCODE=1
	fi
done
exit $EXITCODE