#!/bin/env sh

TEMPLATE_FILE="$(dirname "$0")/verify-script.template"
#echo "template: $TEMPLATE_FILE"

# TODO: argument for the message in case you want to apply it to many files.
read -r -p "Enter message to sign for the file: " MESSAGE
MESSAGE="$MESSAGE\n"
#echo "message: $MESSAGE"

FILE_NAME="$(basename "$1")"
#echo "file name: $FILE_NAME"
FILE_HASH="$(sha256sum "$FILE_NAME" | awk '{print $1}')"
#echo "file hash: $FILE_HASH"

SUBSTITUTED_TEMPLATE=$(sed -e "s!{message}!$MESSAGE!g" -e "s!{filename}!$FILE_NAME!g" -e "s!{filehash}!$FILE_HASH!g" "$TEMPLATE_FILE")

#echo "substituted: $SUBSTITUTED_TEMPLATE"
printf '%s' "$SUBSTITUTED_TEMPLATE" > "$1.sh"