Megatest

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			       (list key val metadata)
			       (list key val))))))

(define (config:eval-string-in-environment str)
  (handle-exceptions
   exn
   (begin
     (debug:print 0 "ERROR: problem evaluating \"" str "\" in the shell environment")
     (debug:print-error 0 *default-log-port* "problem evaluating \"" str "\" in the shell environment")
     #f)
   (let ((cmdres (process:cmd-run->list (conc "echo " str))))
     (if (null? cmdres) ""
	 (caar cmdres)))))

;;======================================================================
;; Make the regexp's needed globally available
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				((runconfigs-get) (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
		   (debug:print 0 "WARNING: failed to process config input \"" l "\"")
		   (debug:print 0 " message: " ((condition-property-accessor 'exn 'message) exn))
		   (debug:print 0 *default-log-port* "WARNING: failed to process config input \"" l "\"")
		   (debug:print 0 *default-log-port* " message: " ((condition-property-accessor 'exn 'message) exn))
		   ;; (print "exn=" (condition->list exn))
		   (set! result (conc "#{( " cmdtype ") " cmd"}")))
		 (if (or allow-system
			 (not (member cmdtype '("system" "shell"))))
		     (with-input-from-string fullcmd
		       (lambda ()
			 (set! result ((eval (read)) ht))))
		    (set! result (conc "#{(" cmdtype ") "  cmd "}"))))
		(case cmdsym
		  ((system shell scheme)
		   (let ((delta (- (current-seconds) start-time)))
		     (if (> delta 2)
			 (debug:print-info 0 "for line \"" l "\"\n command:  " cmd " took " delta " seconds to run with output:\n   " result)
			 (debug:print-info 9 "for line \"" l "\"\n command:  " cmd " took " delta " seconds to run with output:\n   " result)))))
			 (debug:print-info 0 *default-log-port* "for line \"" l "\"\n command:  " cmd " took " delta " seconds to run with output:\n   " result)
			 (debug:print-info 9 *default-log-port* "for line \"" l "\"\n command:  " cmd " took " delta " seconds to run with output:\n   " result)))))
		(loop (conc prestr result poststr)))
	      res))
	res)))

;; Run a shell command and return the output as a string
(define (shell cmd)
  (let* ((output (process:cmd-run->list cmd))
	 (res    (car output))
	 (status (cadr output)))
    (if (equal? status 0)
	(let ((outres (string-intersperse 
		       res
		       "\n")))
	  (debug:print-info 4 "shell result:\n" outres)
	  (debug:print-info 4 *default-log-port* "shell result:\n" outres)
	  outres)
	(begin
	  (with-output-to-port (current-error-port)
	    (lambda ()
	      (print "ERROR: " cmd " returned bad exit code " status)))
	  ""))))

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;; adds to ht if given (must be #f otherwise)
;; envion-patt is a regex spec that identifies sections that will be eval'd
;; in the environment on the fly
;; sections: #f => get all, else list of sections to gather
;; post-section-procs alist of section-pattern => proc, where: (proc section-name next-section-name ht curr-path)
;;
(define (read-config path ht allow-system #!key (environ-patt #f)(curr-section #f)(sections #f)(settings (make-hash-table))(keep-filenames #f)(post-section-procs '()))
  (debug:print-info 5 "read-config " path " allow-system " allow-system " environ-patt " environ-patt " curr-section: " curr-section " sections: " sections " pwd: " (current-directory))
  (debug:print 9 "START: " path)
  (debug:print-info 5 *default-log-port* "read-config " path " allow-system " allow-system " environ-patt " environ-patt " curr-section: " curr-section " sections: " sections " pwd: " (current-directory))
  (debug:print 9 *default-log-port* "START: " path)
  (if (not (file-exists? path))
      (begin 
	(debug:print-info 1 "read-config - file not found " path " current path: " (current-directory))
	(debug:print-info 1 *default-log-port* "read-config - file not found " path " current path: " (current-directory))
	;; WARNING: This is a risky change but really, we should not return an empty hash table if no file read?
	#f) ;; (if (not ht)(make-hash-table) ht))
      (let ((inp        (open-input-file path))
	    (res        (if (not ht)(make-hash-table) ht))
	    (metapath   (if (or (debug:debug-mode 9)
				keep-filenames)
			    path #f)))
	(let loop ((inl               (configf:read-line inp res (calc-allow-system allow-system curr-section sections) settings)) ;; (read-line inp))
		   (curr-section-name (if curr-section curr-section "default"))
		   (var-flag #f);; turn on for key-var-pr and cont-ln-rx, turn off elsewhere
		   (lead     #f))
	  (debug:print-info 8 "curr-section-name: " curr-section-name " var-flag: " var-flag "\n   inl: \"" inl "\"")
	  (debug:print-info 8 *default-log-port* "curr-section-name: " curr-section-name " var-flag: " var-flag "\n   inl: \"" inl "\"")
	  (if (eof-object? inl) 
	      (begin
		(close-input-port inp)
		(hash-table-delete! res "") ;; we are using "" as a dumping ground and must remove it before returning the ht
		(debug:print 9 "END: " path)
		(debug:print 9 *default-log-port* "END: " path)
		res)
	      (regex-case 
	       inl 
	       (configf:comment-rx _                  (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f))
	       (configf:blank-l-rx _                  (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f))
	       (configf:settings   ( x setting val  ) (begin
							(hash-table-set! settings setting val)
							(loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f)))
	       (configf:include-rx ( x include-file ) (let* ((curr-conf-dir (pathname-directory path))
							     (full-conf     (if (absolute-pathname? include-file)
										include-file
										(nice-path 
										(common:nice-path 
										 (conc (if curr-conf-dir
											   curr-conf-dir
											   ".")
										       "/" include-file)))))
							(if (file-exists? full-conf)
							    (begin
							      ;; (push-directory conf-dir)
							      (debug:print 9 "Including: " full-conf)
							      (debug:print 9 *default-log-port* "Including: " full-conf)
							      (read-config full-conf res allow-system environ-patt: environ-patt curr-section: curr-section-name sections: sections settings: settings keep-filenames: keep-filenames)
							      ;; (pop-directory)
							      (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f))
							    (begin
							      (debug:print '(2 9) "INFO: include file " include-file " not found (called from " path ")")
							      (debug:print 2 "        " full-conf)
							      (debug:print '(2 9) #f "INFO: include file " include-file " not found (called from " path ")")
							      (debug:print 2 *default-log-port* "        " full-conf)
							      (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f)))))
	       (configf:section-rx ( x section-name ) (begin
							;; call post-section-procs
							(for-each 
							 (lambda (dat)
							   (let ((patt (car dat))
								 (proc (cdr dat)))
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							  (let ((alist    (hash-table-ref/default res curr-section-name '()))
								(val-proc (lambda ()
									    (let* ((start-time (current-seconds))
										   (cmdres     (process:cmd-run->list cmd))
										   (delta      (- (current-seconds) start-time))
										   (status     (cadr cmdres))
										   (res        (car  cmdres)))
									      (debug:print-info 4 "" inl "\n => " (string-intersperse res "\n"))
									      (debug:print-info 4 *default-log-port* "" inl "\n => " (string-intersperse res "\n"))
									      (if (not (eq? status 0))
										  (begin
										    (debug:print 0 "ERROR: problem with " inl ", return code " status
										    (debug:print-error 0 *default-log-port* "problem with " inl ", return code " status
												 " output: " cmdres)))
									      (if (> delta 2)
										  (debug:print-info 0 "for line \"" inl "\"\n  command: " cmd " took " delta " seconds to run with output:\n   " res)
										  (debug:print-info 9 "for line \"" inl "\"\n  command: " cmd " took " delta " seconds to run with output:\n   " res))
										  (debug:print-info 0 *default-log-port* "for line \"" inl "\"\n  command: " cmd " took " delta " seconds to run with output:\n   " res)
										  (debug:print-info 9 *default-log-port* "for line \"" inl "\"\n  command: " cmd " took " delta " seconds to run with output:\n   " res))
									      (if (null? res)
										  ""
										  (string-intersperse res " "))))))
							    (hash-table-set! res curr-section-name 
									     (config:assoc-safe-add alist
									   			    key 
												    (case (calc-allow-system allow-system curr-section-name sections)
												      ((return-procs) val-proc)
												      ((return-string) cmd)
												      (else (val-proc)))
												    metadata: metapath))
							    (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f))
							  (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f)))
	       (configf:key-no-val ( x key val)            (let* ((alist   (hash-table-ref/default res curr-section-name '()))
								  (fval    (or (if (string? val) val #f) ""))) ;; fval should be either "" or " " (one or more spaces)
							     (debug:print 10 "   setting: [" curr-section-name "] " key " = #t")
							     (debug:print 10 *default-log-port* "   setting: [" curr-section-name "] " key " = #t")
							     (safe-setenv key fval)
							     (hash-table-set! res curr-section-name 
									      (config:assoc-safe-add alist key fval metadata: metapath))
							     (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name key #f)))
	       (configf:key-val-pr ( x key unk1 val unk2 ) (let* ((alist   (hash-table-ref/default res curr-section-name '()))
								  (envar   (and environ-patt (string-search (regexp environ-patt) curr-section-name)))
								  (realval (if envar
									       (config:eval-string-in-environment val)
									       val)))
							     (debug:print-info 6 "read-config env setting, envar: " envar " realval: " realval " val: " val " key: " key " curr-section-name: " curr-section-name)
							     (debug:print-info 6 *default-log-port* "read-config env setting, envar: " envar " realval: " realval " val: " val " key: " key " curr-section-name: " curr-section-name)
							     (if envar (safe-setenv key realval))
							     (debug:print 10 "   setting: [" curr-section-name "] " key " = " val)
							     (debug:print 10 *default-log-port* "   setting: [" curr-section-name "] " key " = " val)
							     (hash-table-set! res curr-section-name 
									      (config:assoc-safe-add alist key realval metadata: metapath))
							     (loop (configf:read-line inp res (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 
								   (config-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 
								       (config:assoc-safe-add alist var-flag newval metadata: metapath))
						      (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name var-flag (if lead lead whsp)))
						    (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f))))
	       (else (debug:print 0 "ERROR: problem parsing " path ",\n   \"" inl "\"")
	       (else (debug:print-error 0 *default-log-port* "problem parsing " path ",\n   \"" inl "\"")
		     (set! var-flag #f)
		     (loop (configf:read-line inp res (calc-allow-system allow-system curr-section-name sections) settings) curr-section-name #f #f))))))))
  
;; pathenvvar will set the named var to the path of the config
(define (find-and-read-config fname #!key (environ-patt #f)(given-toppath #f)(pathenvvar #f))
  (let* ((curr-dir   (current-directory))
         (configinfo (find-config fname toppath: given-toppath))
	 (toppath    (car configinfo))
	 (configfile (cadr configinfo))
	 (set-fields (lambda (curr-section next-section ht path)
		       (let ((field-names (if ht (keys:config-get-fields ht) '()))
			     (target      (or (getenv "MT_TARGET")(args:get-arg "-reqtarg")(args:get-arg "-target"))))
			 (debug:print-info 9 "set-fields with field-names=" field-names " target=" target " curr-section=" curr-section " next-section=" next-section " path=" path " ht=" ht)
			 (debug:print-info 9 *default-log-port* "set-fields with field-names=" field-names " target=" target " curr-section=" curr-section " next-section=" next-section " path=" path " ht=" ht)
			 (if (not (null? field-names))(keys:target-set-args field-names target #f))))))
    (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))))
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	'()
	(map car sectdat))))

(define (configf:get-section cfgdat section)
  (hash-table-ref/default cfgdat section '()))

(define (setup)
  (let* ((configf (find-config))
  (let* ((configf (find-config "megatest.config"))
	 (config  (if configf (read-config configf #f #t) #f)))
    (if config
	(setenv "RUN_AREA_HOME" (pathname-directory configf)))
    config))

;;======================================================================
;; Non destructive writing of config file
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			   (set! res (append res (list hed))))
			  ((not newval) ;; key has been removed
			   (set! new #f))
			  ((not (equal? newval val))
			     (hash-table-set! sechash key newval)
			     (set! new (conc key " " newval)))
			  (else
			   (debug:print 0 "ERROR: problem parsing line number " lnum "\"" hed "\"")))))
			   (debug:print-error 0 *default-log-port* "problem parsing line number " lnum "\"" hed "\"")))))
	   (else
	    (debug:print 0 "ERROR: Problem parsing line num " lnum " :\n   " hed )))
	    (debug:print-error 0 *default-log-port* "Problem parsing line num " lnum " :\n   " hed )))
	  (if (not (null? tal))
	      (loop (car tal)(cdr tal)(if new (append res (list new)) res)(+ lnum 1)))
	  ;; drop to here when done processing, res contains modified list of lines
	  (set! fdat res)))

    ;; step 4: Append new values to the section
    (for-each