share-files

#!/usr/bin/env bash

# ┏━╸╻╻  ┏━╸┏━┓
# ┣╸ ┃┃  ┣╸ ┗━┓
# ╹  ╹┗━╸┗━╸┗━┛
# simple file-selector and share with <dragon-drop> | <localsend>
# deps: <nnn> <dragon-drop> <localsend>

set -euo pipefail

PROG="${0##*/}"
TMPFILE="$(mktemp -t "$PROG.XXXXXX")"

# shellcheck source=/dev/null
[[ -f "$HOME/.config/shell/nnn.sh" ]] && . "$HOME/.config/shell/nnn.sh"

function _usage {
    cat <<-EOF
Usage: $PROG [COMMAND]

    Drop files with <dragon-drop>
    Send files with <localsend>

Commands:
    -d, --drag      Drag and drop files
    -s, --send      Send files locally
EOF
}

function _detach_cmd {
    nohup "$@" >"/dev/null" 2>&1 &
}

function _logerr {
    local msg="$1"
    _notifyme "$msg"
    printf "%s: %s\n" "$PROG" "$msg" >&2
    exit 1
}

function _has {
    local verbose=false
    local c
    if [[ $1 == '-v' ]]; then
        verbose=true
        shift
    fi
    for c in "$@"; do
        c="${c%% *}"
        if ! command -v "$c" &>/dev/null; then
            [[ "$verbose" == true ]] && _logerr "'$c' not found"
            return 1
        fi
    done
}

function _notifyme {
    _has -v notify-send || return
    local prog
    local mesg="<b>$1</b>"
    prog=$(echo "$PROG" | tr '[:lower:]' '[:upper:]')
    notify-send -i "gnome-user-share" "$prog" "$mesg"
}

function _preexit {
    if [[ -f "$TMPFILE" ]]; then
        rm "$TMPFILE" 2>/dev/null
    fi
}

function _select_file {
    _has -v nnn
    nnn -p "$TMPFILE"
}

function _dragon_drop {
    _has -v dragon-drop
    local file="${1:-}"

    if [[ -f "$file" ]]; then
        setsid -f dragon-drop -x "$file"
        exit 0
    fi

    _select_file

    if [[ -f "$TMPFILE" ]]; then
        setsid -f dragon-drop --and-exit --stdin --on-top <"$TMPFILE"
    fi
}

function _localsend {
    _has -v localsend
    local files=("$@")

    if [[ ${#files[@]} -eq 0 ]]; then
        # select files
        _select_file
        while IFS= read -r f; do
            files+=("$f")
        done <"$TMPFILE"
    fi

    for file in "${files[@]}"; do
        echo "f::$file"
    done

    _notifyme "Sending ${#files[@]} files with localsend..."
    _detach_cmd localsend "${files[@]}"
}

trap _preexit EXIT SIGTERM

function main {
    case "${1:-}" in
    -s | --send)
        shift
        _localsend "$@"
        ;;
    -h | --help) _usage ;;
    *) _dragon_drop "$@" ;;
    esac
}

main "$@"