Adopt use of NNN instead of NerdTree and add some aliases

.config/fish/functions/btre.fish

@@ -16,6 +16,7 @@ function btre -a device -d 'Reconnect to a known bluetooth device'
     bluetoothctl pair $devices[$index]
     bluetoothctl trust $devices[$index]
     bluetoothctl connect $devices[$index]
+    sleep 2
 
     pkill bluetoothctl
 end

.config/fish/functions/define_aliases.fish

@@ -2,6 +2,7 @@ function define_aliases -a uname -d 'Defines aliases for commonly used commands'
     alias rcp 'rsync -aP'
     alias dm 'docker-machine'
     alias v 'nvim +FZF'
+    alias j 'joplin'
     alias vg 'vagrant'
     alias tf 'terraform'
     alias tocb 'xclip -in -selection clipboard'

.config/fish/functions/n.fish

@@ -0,0 +1,36 @@
+# Rename this file to match the name of the function
+# e.g. ~/.config/fish/functions/n.fish
+# or, add the lines to the 'config.fish' file.
+
+function n --wraps nnn --description 'support nnn quit and change directory'
+    # Block nesting of nnn in subshells
+    if test -n "$NNNLVL"
+        if [ (expr $NNNLVL + 0) -ge 1 ]
+            echo "nnn is already running"
+            return
+        end
+    end
+
+    # The default behaviour is to cd on quit (nnn checks if NNN_TMPFILE is set)
+    # To cd on quit only on ^G, remove the "-x" as in:
+    #    set NNN_TMPFILE "$XDG_CONFIG_HOME/nnn/.lastd"
+    # NOTE: NNN_TMPFILE is fixed, should not be modified
+    if test -n "$XDG_CONFIG_HOME"
+        set -x NNN_TMPFILE "$XDG_CONFIG_HOME/nnn/.lastd"
+    else
+        set -x NNN_TMPFILE "$HOME/.config/nnn/.lastd"
+    end
+
+    # Unmask ^Q (, ^V etc.) (if required, see `stty -a`) to Quit nnn
+    # stty start undef
+    # stty stop undef
+    # stty lwrap undef
+    # stty lnext undef
+
+    nnn -de $argv
+
+    if test -e $NNN_TMPFILE
+        source $NNN_TMPFILE
+        rm $NNN_TMPFILE
+    end
+end