# -*- mode: sh; -*-
# Thanks <https://github.com/direnv/direnv/issues/73#issuecomment-152284914>
export_function()
{
  local name=$1
  local alias_dir=$PWD/.direnv/aliases
  mkdir -p "$alias_dir"
  PATH_add "$alias_dir"
  local target="$alias_dir/$name"
  if declare -f "$name" >/dev/null; then
    echo "#!$SHELL" > "$target"
    declare -f "$name" >> "$target" 2>/dev/null
    # Notice that we add shell variables to the function trigger.
    echo "$name \$*" >> "$target"
    chmod +x "$target"
  fi
}

use_guix()
{
    # Set GitHub token.
    export GUIX_GITHUB_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

    # Unset 'GUIX_PACKAGE_PATH'.
    export GUIX_PACKAGE_PATH=""

    # Recreate a garbage collector root.
    gcroots="$HOME/.config/guix/gcroots"
    mkdir -p "$gcroots"
    gcroot="$gcroots/guix"
    if [ -L "$gcroot" ]
    then
        rm -v "$gcroot"
    fi

    # Miscellaneous packages.
    PACKAGES_MAINTENANCE=(
        direnv
        git
        git:send-email
        gnupg
        guile-colorized
        guile-readline
        less
        ncurses
        openssh
        xdot
    )

    # Environment packages.
    PACKAGES=(help2man guile-sqlite3 guile-gcrypt
    autoconf autoconf-archive automake libtool
    make cmake gcc-toolchain pkg-config
    libressl libxml2 libstrophe json-c weechat)

    # Thanks <https://lists.gnu.org/archive/html/guix-devel/2016-09/msg00859.html>
    eval "$(guix environment --search-paths --root="$gcroot" --ad-hoc ${PACKAGES[@]} ${PACKAGES_MAINTENANCE[@]} "$@")"

    export CC=gcc
}

use guix