Script to be used in a hashbang to conditionally compile and then run the swift script referenced. usage #!/usr/bin/env swiftc.sh in your swift file, and put in path

swiftc.sh

#!/bin/sh

SWIFT=$(/usr/bin/env xcrun -f swift)

SCRIPTPATH=$1
COMPILEDPATH="$SCRIPTPATH.o"

SDKPATH=$(/usr/bin/env xcrun --show-sdk-path --sdk macosx)

#compile if necessary
if [ $SCRIPTPATH -nt $COMPILEDPATH ]; then
	$SWIFT -o "$COMPILEDPATH" -sdk "$SDKPATH" "$SCRIPTPATH"
	if [ $? -ne 0 ]; then
		exit $?
	fi
fi

# ${@:n} passes on all arguments, sarting with the nth, "${@:n}" makes it work iwth escaped arguments as well (spaces, etc)
$COMPILEDPATH "${@:2}"

./$COMPILEDPATH ${@:2}

For those of us who don't put "." in the $PATH...