Ceylon start script with cygwin support

ceylon.sh

#!/bin/sh

# resolve links - $0 may be a softlink
PRG="$0"
while [ -h "$PRG" ]; do
    ls=`ls -ld "$PRG"`
    link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '/.*' > /dev/null; then
        PRG="$link"
    else
        PRG=`dirname "$PRG"`/"$link"
    fi
done

# detect cygwin
CYGWIN=false
case "`uname`" in
  CYGWIN* )
    CYGWIN=true
    ;;
esac

DIR=$(dirname "$PRG")

CEYLON_HOME="$DIR/.."

if test -z "$JAVA_HOME"
then 
    JAVA="java"
else
    JAVA="$JAVA_HOME/bin/java"
fi

# Make sure we have java installed
if hash java 2>&-
then
    true #nothing
else
    echo "Java not found, you must install Java in order to compiler and run Ceylon programs"
    echo "Go to http://www.java.com/getjava/ to download the latest version of Java"
fi

LIB="$CEYLON_HOME/lib"

#JAVA_DEBUG_OPTS="-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=y"

if [ "$PRESERVE_JAVA_OPTS" != "true" ]; then
	PREPEND_JAVA_OPTS="$JAVA_DEBUG_OPTS"
	PREPEND_JAVA_OPTS="$PREPEND_JAVA_OPTS -Dcom.redhat.ceylon.common.tool.terminal.width=$(tput 2>/dev/null cols)"
    PREPEND_JAVA_OPTS="$PREPEND_JAVA_OPTS -Dcom.redhat.ceylon.common.tool.terminal.color.white=$(tput 2>/dev/null setaf 7)"
    PREPEND_JAVA_OPTS="$PREPEND_JAVA_OPTS -Dcom.redhat.ceylon.common.tool.terminal.color.green=$(tput 2>/dev/null setaf 2)"
    PREPEND_JAVA_OPTS="$PREPEND_JAVA_OPTS -Dcom.redhat.ceylon.common.tool.terminal.color.red=$(tput 2>/dev/null setaf 1)"
	PREPEND_JAVA_OPTS="$PREPEND_JAVA_OPTS -Dcom.redhat.ceylon.common.tool.progname=$(basename $PRG)"
fi
JAVA_OPTS="$PREPEND_JAVA_OPTS $JAVA_OPTS"

BOOTSTRAP_JAR="$LIB/ceylon-bootstrap.jar"

if $CYGWIN; then
    BOOTSTRAP_JAR=`cygpath --windows "$BOOTSTRAP_JAR"`
fi

exec "$JAVA" \
 $JAVA_OPTS \
 -jar "$BOOTSTRAP_JAR" \
 "$@"