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Comment:Completed but not tested non-destructive open/modify/write of config files
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SHA1: 8f378d47407d563d12d4edbe100afdae12a1f9fb
User & Date: matt on 2011-11-27 16:28:25
Other Links: manifest | tags
Context
2011-11-27
21:07
Started construction of the one panel to rule them all check-in: 84f6d60495 user: matt tags: trunk
16:28
Completed but not tested non-destructive open/modify/write of config files check-in: 8f378d4740 user: matt tags: trunk
15:36
Partially complete non-destructive open/modify/write of config files check-in: e21b04bc41 user: matt tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified configf.scm from [e94bf5cc89] to [b0a9c60c64].

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    (append newalist (list (list key val)))))

(define (config:eval-string-in-environment str)
  (let ((cmdres (cmd-run->list (conc "echo " str))))
    (if (null? cmdres) ""
	(caar cmdres))))













;; read a config file, returns hash table of alists
;; 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

(define (read-config path ht allow-system #!key (environ-patt #f))
  (debug:print 4 "INFO: read-config " path " allow-system " allow-system " environ-patt " environ-patt)
  (if (not (file-exists? path))
      (if (not ht)(make-hash-table) ht)
      (let ((inp        (open-input-file path))
	    (res        (if (not ht)(make-hash-table) ht))
	    (include-rx (regexp "^\\[include\\s+(.*)\\]\\s*$"))
	    (section-rx (regexp "^\\[(.*)\\]\\s*$"))
	    (blank-l-rx (regexp "^\\s*$"))
	    (key-sys-pr (regexp "^(\\S+)\\s+\\[system\\s+(\\S+.*)\\]\\s*$"))
	    (key-val-pr (regexp "^(\\S+)\\s+(.*)$"))
	    (comment-rx (regexp "^\\s*#.*"))
	    (cont-ln-rx (regexp "^(\\s+)(\\S+.*)$")))
	(let loop ((inl               (read-line inp))
		   (curr-section-name "default")
		   (var-flag #f);; turn on for key-var-pr and cont-ln-rx, turn off elsewhere
		   (lead     #f))
	  (if (eof-object? inl) 
	      (begin
		(close-input-port inp)
		res)
	      (regex-case 
	       inl 
	       (comment-rx _                  (loop (read-line inp) curr-section-name #f #f))
	       (blank-l-rx _                  (loop (read-line inp) curr-section-name #f #f))
	       (include-rx ( x include-file ) (begin
						(read-config include-file res allow-system environ-patt: environ-patt)
						(loop (read-line inp) curr-section-name #f #f)))
	       (section-rx ( x section-name ) (loop (read-line inp) section-name #f #f))
	       (key-sys-pr ( x key cmd      ) (if allow-system
						  (let ((alist (hash-table-ref/default res curr-section-name '()))
							(val-proc (lambda ()
								    (let* ((cmdres  (cmd-run->list cmd))
									   (status  (cadr cmdres))
									   (res     (car  cmdres)))
								      (if (not (eq? status 0))
									  (begin
									    (debug:print 0 "ERROR: problem with " inl ", return code " status)
									    (exit 1)))
								      (if (null? res)
									  ""
									  (string-intersperse res " "))))))
						    (hash-table-set! res curr-section-name 
								     (config:assoc-safe-add alist
											    key 
											    (if (eq? allow-system 'return-procs)
												val-proc
												(val-proc))))
						    (loop (read-line inp) curr-section-name #f #f))
						  (loop (read-line inp) curr-section-name #f #f)))
	       (key-val-pr ( x key val      ) (let* ((alist   (hash-table-ref/default res curr-section-name '()))
						     (envar   (and environ-patt (string-match (regexp environ-patt) curr-section-name)))
						     (realval (if envar
								 (config:eval-string-in-environment val)
								 val)))
						(if envar
						    (begin
						      (debug:print 4 "INFO: read-config key=" key ", val=" val ", realval=" realval)
						      (setenv key realval)))
						(hash-table-set! res curr-section-name 
								 (config:assoc-safe-add alist key realval))
						(loop (read-line inp) curr-section-name key #f)))
	       ;; if a continued line
	       (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)
								       "")








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    (append newalist (list (list key val)))))

(define (config:eval-string-in-environment str)
  (let ((cmdres (cmd-run->list (conc "echo " str))))
    (if (null? cmdres) ""
	(caar cmdres))))

;;======================================================================
;; Make the regexp's needed globally available
;;======================================================================

(define configf:include-rx (regexp "^\\[include\\s+(.*)\\]\\s*$"))
(define configf:section-rx (regexp "^\\[(.*)\\]\\s*$"))
(define configf:blank-l-rx (regexp "^\\s*$"))
(define configf:key-sys-pr (regexp "^(\\S+)\\s+\\[system\\s+(\\S+.*)\\]\\s*$"))
(define configf:key-val-pr (regexp "^(\\S+)\\s+(.*)$"))
(define configf:comment-rx (regexp "^\\s*#.*"))
(define configf:cont-ln-rx (regexp "^(\\s+)(\\S+.*)$"))

;; read a config file, returns hash table of alists
;; 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

(define (read-config path ht allow-system #!key (environ-patt #f))
  (debug:print 4 "INFO: read-config " path " allow-system " allow-system " environ-patt " environ-patt)
  (if (not (file-exists? path))
      (if (not ht)(make-hash-table) ht)
      (let ((inp        (open-input-file path))
	    (res        (if (not ht)(make-hash-table) ht)))







	(let loop ((inl               (read-line inp))
		   (curr-section-name "default")
		   (var-flag #f);; turn on for key-var-pr and cont-ln-rx, turn off elsewhere
		   (lead     #f))
	  (if (eof-object? inl) 
	      (begin
		(close-input-port inp)
		res)
	      (regex-case 
	       inl 
	       (configf:comment-rx _                  (loop (read-line inp) curr-section-name #f #f))
	       (configf:blank-l-rx _                  (loop (read-line inp) curr-section-name #f #f))
	       (configf:include-rx ( x include-file ) (begin
						(read-config include-file res allow-system environ-patt: environ-patt)
						(loop (read-line inp) curr-section-name #f #f)))
	       (configf:section-rx ( x section-name ) (loop (read-line inp) section-name #f #f))
	       (configf:key-sys-pr ( x key cmd      ) (if allow-system
						  (let ((alist (hash-table-ref/default res curr-section-name '()))
							(val-proc (lambda ()
								    (let* ((cmdres  (cmd-run->list cmd))
									   (status  (cadr cmdres))
									   (res     (car  cmdres)))
								      (if (not (eq? status 0))
									  (begin
									    (debug:print 0 "ERROR: problem with " inl ", return code " status)
									    (exit 1)))
								      (if (null? res)
									  ""
									  (string-intersperse res " "))))))
						    (hash-table-set! res curr-section-name 
								     (config:assoc-safe-add alist
											    key 
											    (if (eq? allow-system 'return-procs)
												val-proc
												(val-proc))))
						    (loop (read-line inp) curr-section-name #f #f))
						  (loop (read-line inp) curr-section-name #f #f)))
	       (configf:key-val-pr ( x key val      ) (let* ((alist   (hash-table-ref/default res curr-section-name '()))
						     (envar   (and environ-patt (string-match (regexp environ-patt) curr-section-name)))
						     (realval (if envar
								 (config:eval-string-in-environment val)
								 val)))
						(if envar
						    (begin
						      (debug:print 4 "INFO: read-config key=" key ", val=" val ", realval=" realval)
						      (setenv key realval)))
						(hash-table-set! res curr-section-name 
								 (config:assoc-safe-add alist key realval))
						(loop (read-line inp) 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)
								       "")
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		   (tal (cdr fdat))
		   (cur "")
		   (led #f)
		   (res '()))
	  ;; ALL WHITESPACE LEADING LINES ARE TACKED ON!!
	  ;;  1. remove led whitespace
	  ;;  2. tack on to hed with "\n"
	  (let ((match (string-match cont-ln-rx hed)))
	    (if match ;; blast! have to deal with a multiline
		(let* ((lead (cadr match))
		       (lval (caddr match))
		       (newl (conc cur "\n" lval)))
		  (if (not led)(set! led lead))
		  (if (null? tal) 
		      (set! fdat (append fdat (list newl)))
		      (loop (car tal)(cdr tal) newl led res))) ;; NB// not tacking newl onto res
		(let ((newres (if led 
				  (append res (list cur hed))
				  (append res (list hed)))))
		  ;; prev was a multiline
		  (if (null? tal)
		      newres
		      (loop (car tal)(cdr tal) "" #f newres))))))))


(define (configf:expand-multi-lines fdat)
  ;; step 1.5 - compress any continued lines
  (if (null? fdat) fdat
	(let loop ((hed (car fdat))
		   (tal (cdr fdat))
		   (cur "")
		   (led #f)
		   (res '()))
	  ;; ALL WHITESPACE LEADING LINES ARE TACKED ON!!
	  ;;  1. remove led whitespace
	  ;;  2. tack on to hed with "\n"
	  (let ((match (string-match cont-ln-rx hed)))
	    (if match ;; blast! have to deal with a multiline
		(let* ((lead (cadr match))
		       (lval (caddr match))
		       (newl (conc cur "\n" lval)))
		  (if (not led)(set! led lead))
		  (if (null? tal) 
		      (set! fdat (append fdat (list newl)))
		      (loop (car tal)(cdr tal) newl led res))) ;; NB// not tacking newl onto res
		(let ((newres (if led 
				  (append res (list cur hed))
				  (append res (list hed)))))
		  ;; prev was a multiline
		  (if (null? tal)
		      newres
		      (loop (car tal)(cdr tal) "" #f newres))))))))

(define (configf:file->list fname)
  (if (file-exists? fname)
      (let ((inp (open-input-file fname)))
	(let loop ((inl (read-line inp))
		   (res '()))
	  (if (eof-object? inl)








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		   (tal (cdr fdat))
		   (cur "")
		   (led #f)
		   (res '()))
	  ;; ALL WHITESPACE LEADING LINES ARE TACKED ON!!
	  ;;  1. remove led whitespace
	  ;;  2. tack on to hed with "\n"
	  (let ((match (string-match configf:cont-ln-rx hed)))
	    (if match ;; blast! have to deal with a multiline
		(let* ((lead (cadr match))
		       (lval (caddr match))
		       (newl (conc cur "\n" lval)))
		  (if (not led)(set! led lead))
		  (if (null? tal) 
		      (set! fdat (append fdat (list newl)))
		      (loop (car tal)(cdr tal) newl led res))) ;; NB// not tacking newl onto res
		(let ((newres (if led 
				  (append res (list cur hed))
				  (append res (list hed)))))
		  ;; prev was a multiline
		  (if (null? tal)
		      newres
		      (loop (car tal)(cdr tal) "" #f newres))))))))

;; note: I'm cheating a little here. I merely replace "\n" with "\n         "
(define (configf:expand-multi-lines fdat)
  ;; step 1.5 - compress any continued lines
  (if (null? fdat) fdat
      (let loop ((hed (car fdat))
		 (tal (cdr fdat))


		 (res '()))












	(let ((newres (append res (list (string-substitute (regexp "\n") "\n         " hed #t)))))



	  (if (null? tal)
	      newres
	      (loop (car tal)(cdr tal) newres))))))

(define (configf:file->list fname)
  (if (file-exists? fname)
      (let ((inp (open-input-file fname)))
	(let loop ((inl (read-line inp))
		   (res '()))
	  (if (eof-object? inl)
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;;   2. Flatten any multiline entries
;;   3. Modify values per contents of "indat" and remove absent values
;;   4. Append new values to the section (immediately after last legit entry)
;;   5. Write out the new list 
;;======================================================================

(define (configf:write-config indat fname #!key (required-sections '()))
  (let* ((include-rx (regexp "^\\[include\\s+(.*)\\]\\s*$"))
	 (section-rx (regexp "^\\[(.*)\\]\\s*$"))
	 (blank-l-rx (regexp "^\\s*$"))
	 (key-sys-pr (regexp "^(\\S+)\\s+\\[system\\s+(\\S+.*)\\]\\s*$"))
	 (key-val-pr (regexp "^(\\S+)\\s+(.*)$"))
	 (comment-rx (regexp "^\\s*#.*"))
	 (cont-ln-rx (regexp "^(\\s+)(\\S+.*)$"))
	 ;; step 1: Open the output file and read it into a list
	 (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


    ;; step 2: Flatten multiline entries
    (if (not (null? fdat))(set! fdat (configf:compress-multi-line 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  '())
		   (sec  #f) ;; section
		   (lnum 0))
	  (regex-case 
	   hed
	   (comment-rx _                  (set! res (append res (list hed)))) ;; (loop (read-line inp) curr-section-name #f #f))
	   (blank-l-rx _                  (set! res (append res (list hed)))) ;; (loop (read-line inp) curr-section-name #f #f))
	   (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! refhash section-name newhash)
						  (set! sechash newhash))
						(set! sechash section-hash))
					    (set! new hed) ;; will append this at the bottom of the loop
					    (set! sec section-name)
					    ))
	   ;; No need to process key cmd, let it fall though to key val
	   (key-val-pr ( x key val      )
		       (let ((newval (config-lookup indat sec key)))
			 ;; 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))








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;;   2. Flatten any multiline entries
;;   3. Modify values per contents of "indat" and remove absent values
;;   4. Append new values to the section (immediately after last legit entry)
;;   5. Write out the new list 
;;======================================================================

(define (configf:write-config indat fname #!key (required-sections '()))







  (let* (;; step 1: Open the output file and read it into a list
	 (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-line 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! refhash section-name newhash)
						  (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 (config-lookup indat sec key)))
			 ;; 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))
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