Megatest

						    "       (conc (or *toppath* (get-environment-variable \"MT_RUN_AREA_HOME\"))"
						    "             (if (string-null? extra) \"\" \"/\")"
						    "             extra)))"))
				((get g)   
				 (let* ((parts (string-split cmd))
					(sect  (car parts))
					(var   (cadr parts)))
				   (conc "(lambda (ht)(configf:lookup ht \"" sect "\" \"" var "\"))")))
				((runconfigs-get rget) (conc "(lambda (ht)(runconfigs-get ht \"" cmd "\"))"))
				;; ((rget)           (conc "(lambda (ht)(runconfigs-get ht \"" cmd "\"))"))
				(else "(lambda (ht)(print \"ERROR\") \"ERROR\")"))))
		;; (print "fullcmd=" fullcmd)
		(handle-exceptions
		 exn
		 (begin

                                                              (calc-allow-system allow-system curr-section-name sections) settings)
                                           curr-section-name key #f)))
	       ;; if a continued line
	       (configf:cont-ln-rx ( x whsp val     )
                                   (let ((alist (hash-table-ref/default res curr-section-name '())))
                                     (if var-flag             ;; if set to a string then we have a continued var
                                         (let ((newval (conc 
                                                        (configf:lookup res curr-section-name var-flag) "\n"
                                                        ;; trim lead from the incoming whsp to support some indenting.
                                                        (if lead
                                                            (string-substitute (regexp lead) "" whsp)
                                                            "")
                                                        val)))
                                           ;; (print "val: " val "\nnewval: \"" newval "\"\nvarflag: " var-flag)
                                           (hash-table-set! res curr-section-name 

    (if toppath (change-directory toppath)) 
    (if (and toppath pathenvvar)(setenv pathenvvar toppath))
    (let ((configdat  (if configfile 
			  (read-config configfile #f #t environ-patt: environ-patt post-section-procs: (list (cons "^fields$" set-fields)) #f))))
      (if toppath (change-directory curr-dir))
      (list configdat toppath configfile fname))))

(define (configf:lookup cfgdat section var)
  (if (hash-table? cfgdat)
      (let ((sectdat (hash-table-ref/default cfgdat section '())))
	(if (null? sectdat)
	    #f
	    (let ((match (assoc var sectdat)))
	      (if match ;; (and match (list? match)(> (length match) 1))
		  (cadr match)
		  #f))
	    ))
      #f))

;; use to have definitive setting:
;;  [foo]
;;  var yes
;;
;;  (configf:var-is? cfgdat "foo" "var" "yes") => #t
;;
(define (configf:var-is? cfgdat section var expected-val)
  (equal? (configf:lookup cfgdat section var) expected-val))

(define config-lookup configf:lookup)
(define configf:read-file read-config)

;; safely look up a value that is expected to be a number, return
;; a default (#f unless provided)
;;
(define (configf:lookup-number cfdat section varname #!key (default #f))
  (let* ((val (configf:lookup *configdat* section varname))

	 (fdat       (configf:file->list fname))
	 (refdat  (make-hash-table))
	 (sechash (make-hash-table)) ;; current section hash, init with hash for "default" section
	 (new     #f) ;; put the line to be used in new, if it is to be deleted the set new to #f
	 (secname #f))

    ;; step 2: Flatten multiline entries
    (if (not (null? fdat))(set! fdat (configf:compress-multi-lines fdat)))

    ;; step 3: Modify values per contents of "indat" and remove absent values
    (if (not (null? fdat))
	(let loop ((hed  (car fdat))
		   (tal  (cadr fdat))
		   (res  '())
		   (lnum 0))
	  (regex-case 
	   hed
	   (configf:comment-rx _                  (set! res (append res (list hed)))) ;; (loop (read-line inp) curr-section-name #f #f))
	   (configf:blank-l-rx _                  (set! res (append res (list hed)))) ;; (loop (read-line inp) curr-section-name #f #f))
	   (configf:section-rx ( x section-name ) (let ((section-hash (hash-table-ref/default refdat section-name #f)))
					    (if (not section-hash)
						(let ((newhash (make-hash-table)))
						  (hash-table-set! refdat section-name newhash) ;; was refhash - not sure that refdat is correct here
						  (set! sechash newhash))
						(set! sechash section-hash))
					    (set! new hed) ;; will append this at the bottom of the loop
					    (set! secname section-name)
					    ))
	   ;; No need to process key cmd, let it fall though to key val
	   (configf:key-val-pr ( x key val      )
		       (let ((newval (configf:lookup indat secname key))) ;; was sec, bug or correct?
			 ;; can handle newval == #f here => that means key is removed
			 (cond 
			  ((equal? newval val)
			   (set! res (append res (list hed))))
			  ((not newval) ;; key has been removed
			   (set! new #f))
			  ((not (equal? newval val))

    ;; step 4: Append new values to the section
    (for-each 
     (lambda (section)
       (let ((sdat   '()) ;; append needed bits here
	     (svars  (configf:section-vars indat section)))
	 (for-each 
	  (lambda (var)
	    (let ((val (configf:lookup refdat section var)))
	      (if (not val) ;; this one is new
		  (begin
		    (if (null? sdat)(set! sdat (list (conc "[" section "]"))))
		    (set! sdat (append sdat (list (conc var " " val))))))))
	  svars)
	 (set! fdat (append fdat sdat))))
     (delete-duplicates (append required-sections (hash-table-keys indat))))

    ;; step 5: Write out new file
    (with-output-to-file fname 
      (lambda ()
	(for-each 
	 (lambda (line)
	   (print line))