#!/usr/bin/env bash

REV=$(date -u +%Y%m%d%H%M%S)
filename=$1

TAB="$(printf '\t')"

titleize() {
    echo "$1" | sed -r -e "s/-|_/ /g" -e 's/\b(.)/\U\1/g' -e 's/ //g'
}

cat > ${REV}_$filename.go << EOF
package migrate

type rev${REV} struct{}

var $(titleize $filename) = &rev${REV}{}

func (r *rev$REV) Revision() int64 {
${TAB}return $REV
}

func (r *rev$REV) Up(op Operation) error {
${TAB}// Migration steps here
}

func (r *rev$REV) Down(op Operation) error {
${TAB}// Revert migration steps here
}
EOF