#!/usr/bin/env bash
set -e
declare canon_name="canon-name/src/canon-name"
declare archive="work/archive"

if [[ ! -x "$canon_name" ]]; then
    gmake -f mk/canon-name.mk
fi
readonly platform=$("$canon_name")

echo "This is build-hc-pkg, running on \"$platform\"."

if [[ "$1" = "clean" ]]; then
    echo "Cleaning..."
    rm -rf work
    exit
fi

declare srcpath=""
if [[ -e "$archive" ]]; then
    srcpath=$(cat "$archive")
fi

if [[ -z "$srcpath" || ! -e "$srcpath" ]]; then
    mkdir -p work
    read -e -p "Enter the file path to ghc-x.y.z-src.tar.bz2: " srcpath
    if [[ -e "$srcpath" ]]; then
        mkdir -p work
        echo "$srcpath" > "$archive"
    else
        echo "$srcpath not found." >&2
        exit 1
    fi
fi

# What's the name of our GNU tar?
declare gnutar=""
if which gnutar >/dev/null 2>&1; then
    gnutar="gnutar"
elif which gtar >/dev/null 2>&1; then
    gnutar="gtar"
else
    echo "We need GNU tar to be installed." >&2
    exit 1
fi

gmake -f mk/main.mk \
    SRCPATH="$srcpath" \
    PLATFORM="$platform" \
    GNUTAR="$gnutar" \
    SHELL="$SHELL"

echo "If you are done, run \"$0 clean\" to cleanup the working directory."