#! /usr/bin/env bash
##
## british_flavour.bash
## by lenorm_f
##

DEFINES=(
        'announce echo'
        'breathlessly -n'

        'behaviour function'
        'behave '

        'perchance if'
        'proceed then'
        'otherwise else'

        'equals -eq'

        'how_about case'
        'in_the_following in'
        'splendid ;;'
        'on_the_off_chance *)'
        'thanks esac'
)

test $# -lt 1 && echo "Usage: $0 <file>" >&2 && exit 1

{
        for i in "${DEFINES[@]}"; do
                echo "#define ${i}"
        done
        grep -v '^#' "$1" \
                | sed 's/£/\$/g' \
                | sed -r 's/perhaps ([^\?]+)\??/\1\)/g'
} \
        | cpp \
        | egrep -v '^(#.*)?$'




################################## Example file ###################################
#! /usr/bin/env bash

behaviour main {
        NAME='Cassie'
        announce "Good morrow, fellow subjects of the Crown. My name is £{NAME}, nice to meet you."

        GUESTS_NUMBER=£RANDOM
        announce breathlessly "£GUESTS_NUMBER people ? "
        perchance [ £((£GUESTS_NUMBER % 2)) equals 0 ]
        proceed
                announce "Looks like we have an even number of guests tonight"
        otherwise
                announce "I'm a bit supersticious, I don't really like having an odd number of guests at my table"
        fi

        how_about tea in_the_following
                perhaps *tea* ?
                        announce "I would be thrilled to have a cup of tea"
                        splendid
                on_the_off_chance
                        announce "Maybe later"
        thanks
}

behave main