[notmuch] Replace pre-new script with SCSH script

This also handles finding 0 emails that have the ‘deleted’ tag without showing
an error.

notmuch/.config/notmuch/default/hooks/pre-new

@@ -1,4 +1,13 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
+# # -*- mode:scheme; -*-
+IFS=" "
+exec scsh -s "$0" "$@"
+!#
 
-notmuch search --output=files tag:deleted | tr '\n' '\0' | xargs -0 -L 1 rm -v
-mbsync -a
+(define deleted
+  (run/sexp (notmuch search --output=files --format=sexp tag:deleted)))
+
+(if (> (length deleted) 0)
+    (map (lambda (mail) (run (rm -v ,mail))) deleted))
+
+(run (mbsync -a))