#!/bin/bash

set -e

VARS=()
FILES=()
VERBOSE=

while [ -n "$1" ]; do
    param="$1"
    arg="$2"

    case "${param}" in
    --eval)
        eval "${arg}"
        shift 2
        ;;
    --var)
        VARS+=(${arg})
        shift 2
        ;;
    --file)
        FILES+=(${arg})
        shift 2
        ;;
    --verbose)
        VERBOSE=1
        shift 2
        ;;
    *)
        echo "Ignoring unknown parameter: ${param}"
        shift
    esac
done

if [ ${#FILES[@]} -eq 0 ]; then
    echo "No input files"
    exit 0
fi

for var in ${VARS[@]}; do
    echo "Replacing '${var}' with '${!var}'"
    sed -i"" \
        -e "s#%%${var}%%#${!var}#g" \
        "${FILES[@]}"
done

if [ -n "${VERBOSE}" ]; then
    cat ${FILES[@]}
fi