configure

#!/bin/sh
set -e

# set defaults
PREFIX=/usr/local
HOST=
DEBUG=false

# parse options
while [ $# != 0 ]; do
    arg=$1
    case "$arg" in
        "--help")
            echo "This script fetches dependencies and configures the build."
            echo "Options:"
            echo "    --help          Show this help"
            echo "    --prefix        Set the install prefix (default: /usr/local)"
            echo "    --host          Set the host tuple used as a prefix to the build tools (default: none)"
            echo "    --enable-debug  Enables debug symbols, assertions, extra checks, etc. (default: disabled)"
            exit 1
            ;;
        "--prefix="*)
            PREFIX="${1#--prefix=}";;
        "--prefix")
            PREFIX="$2"; shift;;
        "--host="*)
            HOST="${1#--host=}";;
        "--host")
            HOST="$2"; shift;;
        "--enable-debug")
            DEBUG=true;;
        "--disable-debug")
            DEBUG=false;;
        *)
            echo "ERROR: unrecognized option: $arg"
            exit 1
    esac
    if [ $# = 0 ]; then
        echo "ERROR: $arg must be followed by an argument."
        exit
    fi
    shift
done

# set tool prefix
if [ "x$HOST" = "x" ]; then
    TOOL_PREFIX=
else
    TOOL_PREFIX=$HOST-
fi

# dependency fetch function
fetch_lib() {
    local name file hash url
    name="$1"
    file="$2"
    hash="$3"
    url="$4"

    if [ "x$DOWNLOAD_CACHE" = "x" ]; then
        DOWNLOAD_CACHE=$HOME/.cache/downloads
    fi

    local path temp
    path="$DOWNLOAD_CACHE/$2"
    temp="$DOWNLOAD_CACHE/tmp.$2"

    if [ -e "$path" ]; then
        touch "$path"
    else
        echo "Fetching $file from $url"
        mkdir -p "$(dirname "$path")"
        curl -Lo "$temp" "$url"
        mv $temp $path
    fi

    local actual_hash
    actual_hash=$(sha256sum $path|cut -d\  -f1)
    if [ "$hash" != "$actual_hash" ]; then
        echo "ERROR: Hash mismatch on $path"
        echo "    Expected: $hash"
        echo "    Actual:   $actual_hash"
        exit 1
    fi

    local folder
    folder="contrib/$name"
    rm -rf "$folder"
    mkdir -p "$folder"
    echo "Extracting $file"

    if [ "${file##*.}" = "zip" ]; then
        # Note: This will miss top-level hidden files. There isn't
        # an easy portable "dotglob"; we're not going to bother
        # putting in a bunch of shell-specific workarounds. If this
        # misses a hidden file you care about, move it manually.
        (cd "$folder" && unzip -q "$path" && mv */* .)
    else
        (cd "$folder" && tar -xf "$path" --strip-components=1)
    fi
}

# fetch dependencies
fetch_lib mpack mpack-20170122-df17e83f.tar.gz \
    872897ca06c01e73601784c883e0de981bed7419d2809edf02192756e2fe4ff7 \
    "https://github.com/ludocode/mpack/archive/df17e83f0fa8571b9cd0d8ccf38144fa90e244d1.tar.gz"

fetch_lib rapidjson rapidjson-20160720-99ba17bd.tar.gz \
    dcf3f10e51ea0f51cd0756d36e5bfa24b2c8c57f9c33dfcce0c951608bf7af4b \
    "https://github.com/Tencent/rapidjson/archive/99ba17bd66a85ec64a2f322b68c2b9c3b77a4391.tar.gz"

LIBB64_VERSION=1.2.1
fetch_lib libb64 libb64-${LIBB64_VERSION}.zip \
    20106f0ba95cfd9c35a13c71206643e3fb3e46512df3e2efb2fdbf87116314b2 \
    "https://downloads.sourceforge.net/project/libb64/libb64/libb64/libb64-${LIBB64_VERSION}.zip?use_mirror=autoselect"

# write config
cat >config.mk <<EOF
HOST = $HOST
PREFIX = $PREFIX
DEBUG = $DEBUG
TOOL_PREFIX = $TOOL_PREFIX
LIBB64_VERSION = $LIBB64_VERSION
EOF
echo "Configuration:"
cat config.mk
echo "Done configure."