nnn/plugins/dragdrop

#!/usr/bin/env sh

# Description: Open a Drag and drop window, to drop files onto other programs.
#              Also provides drag and drop window for files.
#
# Dependencies: https://github.com/mwh/dragon
#
# Notes:
# - Files that are dropped will be added to nnn's selection
#   Some webbased files will be downloaded to current directory with curl
#   and it may overwrite some existing files
# - The user has to mm to clear nnn's selection first
#
# Shell: POSIX compliant
# Author: 0xACE

selection=${NNN_SEL:-${XDG_CONFIG_HOME:-$HOME/.config}/nnn/.selection}
resp=f
all=
if which dragon-drag-and-drop >/dev/null 2>&1; then
    dnd="dragon-drag-and-drop"
else
    dnd="dragon"
fi

add_file ()
{
    printf '%s\0' "$@" >> "$selection"
}

use_all ()
{
    printf "mark --all (a) [default=none]: "
    read -r resp
    if [ "$resp" = "a" ]; then
        all="--all"
    else
        all=""
    fi
}

if [ -s "$selection" ]; then
    printf "Drop file (r). Drag selection (s), Drag current directory (d) or drag current file (f) [default=f]: "
    read -r resp
else
    printf "Drop file (r). Drag current directory (d) or drag current file (f) [default=f]: "
    read -r resp
    if [ "$resp" = "s" ]; then
        resp=f
    fi
fi

if [ "$resp" = "s" ]; then
    use_all
    sed -z 's|'"$PWD/"'||g' < "$selection" | xargs -0 "$dnd" "$all" &
elif [ "$resp" = "d" ]; then
    use_all
    "$dnd" "$all" "$PWD/"* &
elif [ "$resp" = "r" ]; then
    true > "$selection"
    "$dnd" --print-path --target | while read -r f
    do
            if printf "%s" "$f" | grep '^\(https\?\|ftps\?\|s\?ftp\):\/\/' ; then
                    curl -LJO "$f"
                    add_file "$PWD/$(basename "$f")"
            elif [ -e "$f" ]; then
                    add_file "$f"
            fi
    done &
else
    if [ -n "$1" ] && [ -e "$1" ]; then
        "$dnd" "$1" &
    fi
fi