#!/bin/bash
set -e

ARCH=$(uname -m)

BASEDIR="$(cd "$(dirname "$0")" && pwd)"
ZIGDIR=$BASEDIR/.cache/zig
VERSION=$(< build.zig.version)
ZIGVER="zig-linux-$ARCH-$VERSION"
ZIG=$ZIGDIR/$ZIGVER/zig

if [ "$1" == "update" ] ; then
    curl -L --silent https://ziglang.org/download/index.json | jq -r '.master | .version' > build.zig.version
    NEWVERSION=$(< build.zig.version)

    if [ "$VERSION" != "$NEWVERSION" ] ; then
        $0 cdb
        exec $0
    fi
    echo zig version $VERSION is up-to-date
    exit 0
fi

get_zig() {
    (
        mkdir -p "$ZIGDIR"
        cd "$ZIGDIR"
        TARBALL="https://ziglang.org/builds/$ZIGVER.tar.xz"

        if [ ! -d "$ZIGVER" ] ; then
            curl "$TARBALL" | tar -xJ
        fi
    )
}
get_zig

if [ "$1" == "cdb" ] ; then
    rm -rf zig-cache
    rm -rf zig-bin
    rm -rf .cache/cdb

    $ZIG build

    (echo \[ ; cat .cache/cdb/* ; echo {}\]) | perl -0777 -pe 's/,\n\{\}//igs' | jq . | grep -v 'no-default-config' > compile_commands.json
    exit 0
fi

exec $ZIG "$@"