Refactor codebase to use nix modules

hmModules/apps/shells/fish/functions/n.fish

@@ -0,0 +1,30 @@
+# Block nesting of nnn in subshells
+if test -n "$NNNLVL"
+    if [ (expr $NNNLVL + 0) -ge 1 ]
+  exit
+        return
+    end
+end
+
+# The default behaviour is to cd on quit (nnn checks if NNN_TMPFILE is set)
+# To cd on quit only on ^G, remove the "-x" as in:
+#    set NNN_TMPFILE "$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 -T v $argv
+
+if test -e $NNN_TMPFILE
+    source $NNN_TMPFILE
+    rm $NNN_TMPFILE
+end