[Plugins] Fuzzy find plugins and run them; unmount mountpoints from their subfolders (#977)

* Fuzzy find plugins and run them

* Hide find warning when $otherplugins is not set

* Fix prompt on error 2

* Use /home/mathieu

* unmount-parent plugin

* Add dependencies and shell description

* Add dependencies and fix CI issue?

* Improve fzfplug prompt, fix shellcheck warnings, restore mistakenly deleted line in README

* Typo

* Make both scripts POSIX-compliant and small improvements

* Final cosmetic changes

* bis

* Clarify description

* Typo

* Typo

* Better support for custom dirs and use bat if available

Co-authored-by: M <>

plugins/README.md

@@ -27,6 +27,7 @@ Plugins extend the capabilities of `nnn`. They are _executable_ scripts (or bina
 | [fzcd](fzcd) | Change to the directory of a fuzzy-selected file/dir | sh | fzf |
 | [fzhist](fzhist) | Fuzzy-select a cmd from history, edit in `$EDITOR` and run | sh | fzf, mktemp |
 | [fzopen](fzopen) | Fuzzy find a file in dir subtree and edit or open | sh | fzf, xdg-open |
+| [fzplug](fzplug) | Fuzzy find, preview and run other plugins | sh | fzf |
 | [fzz](fzz) | Change to any directory in the z database with fzf | sh | fzf, z |
 | [getplugs](getplugs) | Update plugins to installed `nnn` version | sh | curl |
 | [gpg\*](gpg\*) | Encrypt/decrypt files using GPG [✓] | sh | gpg |
@@ -65,6 +66,7 @@ Plugins extend the capabilities of `nnn`. They are _executable_ scripts (or bina
 | [togglex](togglex) | Toggle executable mode for selection [✓] | sh | chmod |
 | [treeview](treeview) | Informative tree output in `$EDITOR` | sh | tree |
 | [uidgid](uidgid) | List user and group of all files in dir | sh | ls, less |
+| [unmount-parent](unmount-parent) | Unmount a remote mountpoint from within | sh | fusermount |
 | [upgrade](upgrade) | Upgrade nnn manually on Debian 9 Stretch | sh | curl |
 | [upload](upload) | Upload to Firefox Send or ix.io (text) or file.io (bin) | sh | [ffsend](https://github.com/timvisee/ffsend), curl, jq, tr |
 | [vidthumb](vidthumb) | Show video thumbnails in terminal | sh | [ffmpegthumbnailer](https://github.com/dirkvdb/ffmpegthumbnailer),<br>[lsix](https://github.com/hackerb9/lsix) |

plugins/fzplug

@@ -0,0 +1,49 @@
+#!/usr/bin/env sh
+
+# Description: Fuzzy find and execute nnn plugins (and, optionally, custom scripts located elsewhere).
+# Description and details of plugins can be previewed from the fzf interface. Use `?` to toggle preview
+# pane on and off.
+#
+# For better compatibility with as many nnn plugins as possible, fzfplug will first execute
+# the chosen script on the file hovered in nnn, and upon failure, try to run it with no target
+# (which should actually run it on selected files if nnn has an active selection). I don't
+# have the required dependencies to confirm compatibility with all scripts though.
+#
+# Dependencies: find, fzf, cat (or bat, if installed)
+# Shell: POSIX compliant
+# Author: Kabouik
+
+# OPTIONAL SCRIPTS SOURCES
+# Leave blank or fill with the absolute path of a folder containing executable scripts other than nnn plugins
+# (e.g., "$HOME/.local/share/nautilus/scripts", since there are numerous Nautilus script git repositories).
+# Add extra variables if need be, but be sure to call them in the find command below at lines 28:49 and 30:49.
+#CUSTOMDIR1="$HOME/.local/share/nautilus/scripts"
+CUSTOMDIR1=""
+CUSTOMDIR2=""
+
+# REQUIRED VARIABLES
+nnnpluginsdir="$HOME/.config/nnn/plugins"
+
+# PREVIEW WITH bat INSTEAD OF cat IF INSTALLED
+if [ -z "$(command -v bat)" ]; then
+    plugin=$(find "$nnnpluginsdir" "$CUSTOMDIR1" "$CUSTOMDIR2" -maxdepth 3 -perm -111 -type f 2>/dev/null | fzf --ansi --preview 'cat {}' --preview-window right:66% --delimiter / --with-nth -1 --bind="?:toggle-preview")
+else
+    plugin=$(find "$nnnpluginsdir" "$CUSTOMDIR1" "$CUSTOMDIR2" -maxdepth 3 -perm -111 -type f 2>/dev/null | fzf --ansi --preview 'bat --color=always --style=grid {}' --preview-window right:66% --delimiter / --with-nth -1 --bind="?:toggle-preview")
+fi
+
+# TRY RUNNING THE SCRIPT ON HOVERED FILE FIRST, AND ABORT IF NO PLUGIN WAS SELECTED IN FZFPLUG (ESC OR ^C),
+err=0
+if ! [ "$plugin" = "" ]; then
+    "$plugin" "$1" || err=1
+fi
+
+# IF THAT FAILS WITH HOVERED FILE, TRY WITH NO TARGET (nnn SELECTIONS SHOULD STILL BE PASSED TO THE SCRIPT IN THAT CASE)
+if [ "$err" -eq "1" ]; then
+    clear && "$plugin" || err=2
+fi
+
+# IF THAT FAILS TOO, ABORT AND SHOW AN ERROR
+if [ "$err" -eq "2" ]; then
+    sep="\n---\n"
+    printf "$sep""Failed to execute '%s'. See error above or try without fzfplug. Press return to continue. " "$plugin" && read -r _ && clear
+fi

plugins/unmount-parent

@@ -0,0 +1,48 @@
+#!/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