# Pastebin jkv5hAe7
(computed-file "kresd.conf"
  (with-imported-modules '((ice-9 string-fun)
                           (ice-9 custom-ports)
                           (ice-9 textual-ports))
    #~(begin
        (use-modules (ice-9 string-fun)
                     (ice-9 textual-ports))
        (let ((tmpl #$(local-file "../../data/kresd.conf.tmpl")))
          (call-with-output-file #$output
            (lambda (out)
              (call-with-input-file tmpl
                (lambda (in)
                  (display (string-replace-substring
                             (get-string-all in)
                             "%%hostname%%" #$host-name)
                           out)))))))))