nnn/plugins/unmount-parent

#!/usr/bin/env sh

# Description: Autodetects a nnn remote mountpoint (mounted with `c`) from any of its subfolders and allows unmounting it
# from there without first going back to the top or entering the remote name. Also works when hovering the mountpoint
# directly like vanilla `u`.
#
# Dependencies: fusermount
# Shell: POSIX compliant
# Authors: Kabouik & 0xACE
#
# TODO: Try better avoiding lazy unmount by forcing nnn context to leave the subfolder before fusermount.
# I tried `printf "%s" "0c$m" > "$NNN_PIPE"` but this would break nnn UI all the time, see #854.

# ENVIRONMENT
err=0
m=$HOME/.config/nnn/mounts
if [ "$PWD" = "$m" ]; then  # ALLOW USING THE SCRIPT ON HOVERED DIRECTORY IF USER IS IN ~/.config/nnn/mounts
    d="$1"
else
    d=$(dirname "$(readlink -f "$1")" | grep -oP "^$m\K.*" | cut -d"/" -f2)
fi

# TEST IF USER IS CURRENTLY WITHIN $m OR A SUBFOLDER, ABORT IF NOT
    if [ "$d" = "" ]; then
        clear && printf "You are not in a remote folder mounted with nnn. Press return to continue. " && read -r _
    else
        # TEST IF $m/$d IS A MOUNTPOINT AND TRY UNMOUNTING IF YES
        mountpoint -q -- "$m/$d"
        if [ "$?" -eq "1" ]; then
            clear && printf "Parent '%s' is not a mountpoint. Press return to continue. " "$d" && read -r _
        else
            cd "$m" && fusermount -uq "$m/$d" || err=1
            if [ "$err" -eq "0" ]; then
                rmdir "$m/$d" && clear && printf "Parent '%s' unmounted." "$d"
            else
                clear && printf "Failed to unmount. Try lazy unmount? [Yy/Nn] " && read -r
            fi
        fi
    fi

# IF FAILURE TO UNMOUNT, OFFER TO TRY LAZY UNMOUNT
    if [ "$REPLY" = "y" ] || [ "$REPLY" = "Y" ]; then 
        err=0
        cd "$m" && fusermount -uqz "$m/$d" || err=1
        if [ "$err" -eq "0" ]; then
            rmdir "$m/$d" && clear && printf "Parent '%s' unmounted with lazy unmount. " "$d"
        fi
    fi