_sod() {
    if [ -d "$1" ] && [ -n "$(ls "$1")" ]; then
        for FILENAME in $(ls "$1" | sort -n)
        do
            source "$1/$FILENAME"
        done
    fi
}

lt() {
    du -h "${1:-.}" 2>/dev/null | sort -h | tac
}

destroy() {
    test -n "$1" || return 1
    test -e "$1" || return 1

    echo -n "Sure want to destroy file '$1' with size $(du -hs "$1" | awk '{printf $1}') [y/N] "
    read -r response
    [[ $response == [yY] ]] && shred -zun 25 "$1"
}

workon() {
    source /opt/pythonenv/"${1:-$(basename $PWD)}"/bin/activate
}

py() {
    if [[ -z "$@" && -x "$(command -v ipython 2>/dev/null)" ]]; then
        ipython -i -c "q = exit"
    else
        python3 $@
    fi
}

ve() {
    python3 -m virtualenv "${1:-venv}" && . "${1:-venv}/bin/activate"
}

va() {
    local activate_venv

    if [ -f "./venv/bin/activate" ]; then
        source "./venv/bin/activate"
        return 0
    fi

    activate_venv="$(find -P . -maxdepth 3 -type f -wholename '*/bin/activate' | sort | head -n 1)"

    if [ -n "$activate_venv" ]; then
        source "$activate_venv"
        return 0
    else
        echo "va: error: virtual environment not found, use python3 -m virtualenv venv" >&2
        return 1
    fi
}


extract() {
    if [ -z "$1" ]; then  # if string non-zero
        # display usage if no parameters given
        echo "extract: error: usage: extract <path/file_name>.<zip|rar|bz2|gz|tar|tbz2|tgz|Z|7z|xz|ex|tar.bz2|tar.gz|tar.xz>"
        return 2
    fi

    if ! [ -f "$1" ]; then   # if file not exist
        echo "extract: error: '$1' file does not exist" >&2
        return 1
    fi

    local NAME
    NAME=${1%%.*}  # removes extension from filename


    if [ -e "$NAME" ]; then
        echo "extract: error: '$NAME' exists" >&2
        return 1
    fi

    mkdir "$NAME" && cd "$NAME" || return 1

    case $1 in
        *.tar.bz2)  tar xjf      ../"$1" ;;
        *.tar.gz)   tar xzf      ../"$1" ;;
        *.tar.xz)   tar xJf      ../"$1" ;;
        *.lzma)     unlzma       ../"$1" ;;
        *.bz2)      bunzip2      ../"$1" ;;
        *.rar)      unrar x -ad  ../"$1" ;;
        *.gz)       gunzip       ../"$1" ;;
        *.tar)      tar xf       ../"$1" ;;
        *.tbz2)     tar xjf      ../"$1" ;;
        *.tgz)      tar xzf      ../"$1" ;;
        *.zip)      unzip        ../"$1" ;;
        *.Z)        uncompress   ../"$1" ;;
        *.7z)       7z x         ../"$1" ;;
        *.xz)       unxz         ../"$1" ;;
        *.exe)      cabextract   ../"$1" ;;
        *)          echo "extract: error: '$1' - unknown archive method" >&2 ;;
    esac
    cd ..
}


mcd() {
    if [ -z "$1" ]; then
        cd "$(mktemp -td "${USER:-user}.XXXX")"
    else
        mkdir -p "$1" && cd "$1"
    fi
}


# toggle wireguard vpn with interface /etc/wireguard/wg0.conf
# to allow sudo user toggle vpn without password:
## sudo groupadd wireguard
## sudo usermod -aG wireguard $USER
vpn() {
    local STATUS SERVICE CONFIG CONFIGFILE
    CONFIG="${1:-wg0}"

    CONFIGFILE="/etc/wireguard/$CONFIG.conf"

    test -e "$CONFIGFILE" || (echo "Config '$CONFIGFILE' not exists" >&2; return 1) && (

        SERVICE="wg-quick@$CONFIG.service"

        systemctl --quiet is-active "$SERVICE" && \
            (sudo systemctl stop "$SERVICE" && echo DOWN) || \
            (sudo systemctl start "$SERVICE" && ip -br a | grep "$CONFIG" | awk '{print $1":\t"$3}')
    )
}

toggle-ssh-proxy() {
    SSH_PROXY_CONTROL_FILE="$XDG_RUNTIME_DIR/ssh_$1_proxy.control"

    if [ -z "$1" ]; then
        echo "Proxy ssh server hostname not specified" 1>&2
        return 1
    fi

    if [ -e "$SSH_PROXY_CONTROL_FILE" ]; then
        unset {http,https,ftp,rsync,no}_proxy
        ssh -S "$SSH_PROXY_CONTROL_FILE" -O exit "$1"
        unset SSH_PROXY_PID
        echo "Disabled"
    else
        ssh -nCTN -S "$SSH_PROXY_CONTROL_FILE" -D 1080 "$1"
        export {http,https,ftp,rsync}_proxy="socks5://127.0.0.1:1080" && \
        export no_proxy="localhost,127.0.0.1/8,localaddress,.localdomain.com,192.168.0.0/16,10.0.0.0/8,172.16.0.0/12"
        echo "Enabled"
    fi
}

open() {
    test -e $1 || return 1
    nohup xdg-open $1 1>/dev/null 2>&1 &
}

split-file() {
    test -e "$1" || return 1
    local _size="${2:-1G}"

    if [ -d "$1" ]; then
        (mkdir "$1.tar.gz.splitted" && cd "$1.tar.gz.splitted" && tar -cz "../$1" | split -d -b "$_size")
    else
        (mkdir "$1.splitted" && cd "$1.splitted" && split -d -b "$_size" "../$1")
    fi
}

json() {
    if [ -t 0 ]; then  # argument
       python -m json.tool <<< "$*"
    else  # pipe
       python -m json.tool
    fi
}

_get_full_file_extension() {
    local filename
    filename=$(basename "$1")
    if [ "${filename:0:1}" = "." ]; then
        filename="${filename:1}"
    fi
    echo ${filename#*.}
}

rmt() {
    local TRASH
    TRASH=~/.trash

    local filename
    for filename in $*
    do
        local filename_out_path="${TRASH}$(realpath "$filename")"
        mkdir -p "$(dirname "$filename_out_path")"
        mv "$filename" "${filename_out_path}_$(date +%s)"
    done
}

showtips() {
    TIPS_DIR="$HOME/.tips"

    if [ ! -d "$TIPS_DIR" ]; then
        mkdir "$TIPS_DIR" 2>/dev/null
        git init "$TIPS_DIR"
    fi

    local content
    for filename in "$TIPS_DIR"/*
    do
        content="$(cat "$filename")"
        echo "$content"
    done
    return 0
}

most-often-commands() {
    history 0 | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn
}

# calculator
= () {
    echo "$*" | bc -l
}


# Enable X11Forwarding and disable mux session
sshx() {
    ssh -X -o ControlMaster=no -o ControlPath=none $@
}