function()                      # Keep local variables in here.
{

############################## Paths ###########################################

export PATH="${HOME}/bin:${HOME}/.local/bin:${PATH}"
export ZDOTDIR="${XDG_CONFIG_HOME:-${HOME}/.config}/zsh"
export HISTFILE="${ZDOTDIR}/.zsh_history"
export ZSH_CACHE_DIR="${XDG_CACHE_HOME:-${HOME}/.cache}/zsh"
mkdir -p "${ZSH_CACHE_DIR}"

if [[ -d "${HOME}/.local/share/man/" ]]; then
    export MANPATH="${MANPATH}:${HOME}/.local/share/man"
fi

############################ Editor ############################################

# Set preferred editor.
# Add Defaults env_keep += "SSH_CONNECTION" to /etc/sudoers.d/ssh_vars
if command -v emacsclient > /dev/null; then
    export EMACS_SOCKET_NAME="${HOME}/.emacs.d/server/server"
    if pgrep -f "emacs --daemon" > /dev/null; then
        VISUAL="$(command -v emacsclient) -c"
    else
        VISUAL="$(command -v emacs)"
    fi
    if [[ $(id -u) -eq 0 ]]; then
        # Edit files as root in the Emacs instance run by the current user.
        VISUAL="$(command -v emacsremote) --sudo --local"
    fi
elif command -v emacs > /dev/null; then
    VISUAL="$(command -v emacs)"
elif command -v nano > /dev/null; then
    VISUAL="$(command -v nano)"
elif command -v vim > /dev/null; then
    VISUAL="$(command -v vim)"
fi
export VISUAL
export EDITOR="${VISUAL}"
export ALTERNATE_EDITOR="$(command -v nano)"

############################# Plugins ##########################################

if command -v fzf > /dev/null; then
    # Only load these plugins if fzf was found.
    local depends_on_fzf="Aloxaf/fzf-tab"
fi

if command -v antibody > /dev/null; then
    local plugin_cache_dir="$(antibody home)"
    export ZSH_PLUGIN_SOURCE="${plugin_cache_dir}/antibody-plugins.zsh"

    if [[ -f ${ZSH_PLUGIN_SOURCE} ]] \
           && [[ $(stat --format="%s" ${ZSH_PLUGIN_SOURCE}) -ne 0 ]]; then
        local mod_month="$(stat --format="%y" ${ZSH_PLUGIN_SOURCE} 2> /dev/null | cut -d\- -f2)"
        # Update plugins every month.
        if [[ ${mod_month} -ne $(date +'%m') ]]; then
            antibody update --parallelism=$(nproc --ignore=1) \
                && touch ${ZSH_PLUGIN_SOURCE}
        fi
    else
        mkdir -p ${plugin_cache_dir}
        antibody bundle --parallelism=$(nproc --ignore=1) <<EOF > ${ZSH_PLUGIN_SOURCE}
robbyrussell/oh-my-zsh path:lib
robbyrussell/oh-my-zsh path:plugins/history-substring-search
${depends_on_fzf}
zsh-users/zsh-autosuggestions
mafredri/zsh-async
zsh-users/zsh-syntax-highlighting
EOF
    fi
else
    echo "antibody not found." >&2
fi

############################# Variables ########################################

# minicom color on.
export MINICOM="-c on -R utf-8"

export PASSWORD_STORE_GENERATED_LENGTH="43"

export LESS="--tabs=4 --RAW-CONTROL-CHARS --LONG-PROMPT"

if command -v highlight > /dev/null; then
    # ~/.lessfilter handles the highlighting
    LESSOPEN="| $(command -v lesspipe) %s"
    export CATOPEN="highlight --validate-input --force --out-format=truecolor --style=base16/unikitty-reversible --stdout %s"
elif command -v pygmentize > /dev/null; then
    LESSOPEN="| $(command -v pygmentize) -f terminal16m -g -O style=paraiso-dark %s"
elif command -v source-highlight > /dev/null; then
    LESSOPEN="| $(command -v source-highlight) --failsafe --infer-lang --out-format=esc --style-file=esc.style --input=%s"
elif command -v lesspipe > /dev/null; then
    LESSOPEN="| $(command -v lesspipe) %s"
elif command -v lesspipe.sh > /dev/null; then
    LESSOPEN="| $(command -v lesspipe.sh) %s"
fi
export LESSOPEN

# Show AS for each hop.
export MTR_OPTIONS="-z"

# Set SDL soundfont.
if [[ -f "/usr/share/sounds/sf2/FluidR3_GM.sf2" ]]; then
   export SDL_SOUNDFONTS="/usr/share/sounds/sf2/FluidR3_GM.sf2"
fi

# Make virsh use the local hypervisor by default.
if command -v virsh > /dev/null; then
    export LIBVIRT_DEFAULT_URI="qemu:///system"
fi

# Use ISO 8601 date & time.
if command -v locale > /dev/null; then
    locale -a | grep -q en_DK && export LC_TIME="en_DK.utf8"
fi

export CCACHE_DIR="/var/cache/ccache"

# Set terminal
if command -v alacritty > /dev/null; then
    export TERMINAL="alacritty"
elif command -v xfce4-terminal > /dev/null; then
    export TERMINAL="xfce4-terminal"
elif command -v urxvt > /dev/null; then
    export TERMINAL="urxvt"
elif command -v xterm > /dev/null; then
    export TERMINAL="xterm"
fi

# Host specific settings.
case $(hostname) in
    schnibble | gaffer | localhost)
        export GIT_SSH_COMMAND="ssha" # Termux command for ssh with key-add.
        export CPATH="/data/data/com.termux/files/usr/local/include"
        export LIBRARY_PATH="/data/data/com.termux/files/usr/local/lib"
        ;;
esac

[[ -f "${ZDOTDIR}"/zsecrets ]] && source "${ZDOTDIR}"/zsecrets
[[ -d "${ZDOTDIR}"/functions ]] && fpath+="${ZDOTDIR}"/functions && export fpath

############################# Daemons ##########################################

# Run SSH/GPG agents if they are installed and not already started. If they are
# started, attempt to inherit them.
if command -v keychain > /dev/null; then
    if [[ $(pgrep --uid $(id -u) ssh-agent)
        && $(pgrep --uid $(id -u) gpg-agent) ]]; then
        # Set environment variables from files.
        if [[ -z "${SSH_AUTH_SOCK}" ]]; then
            source "${HOME}/.keychain/$(hostname)-sh"
        fi
        if [[ -z "${GPG_AGENT_INFO}" ]]; then
            source "${HOME}/.keychain/$(hostname)-sh-gpg"
        fi
    else
        # Start SSH/GPG agents and write environment variables to files.
        eval $(keychain --agents "ssh,gpg" \
                        --timeout $((60*16)) \
                        --inherit local \
                        --quiet --eval)
        # <https://github.com/funtoo/keychain/issues/126>
        eval $(keychain --agents "ssh,gpg" \
                        --timeout $((60*16)) \
                        --inherit local \
                        --quiet --eval)
    fi
else
    # keychain not installed, start SSH/GPG agents if they are not running.
    if command -v ssh-agent > /dev/null \
            && [[ ! $(pgrep --uid $(id -u) ssh-agent) ]]; then
        eval $(ssh-agent -t 16H 2> /dev/null)
    fi
    if command -v gpg-agent > /dev/null \
            && [[ ! $(pgrep --uid $(id -u) gpg-agent) ]]; then
        eval $(gpg-agent --daemon --quiet --default-cache-ttl $((60*16)) \
                         --max-cache-ttl $((60*16)))
    fi
fi

return 0

}