Megatest

;;======================================================================

(declare (unit env))

(declare (uses debugprint))
(declare (uses mtargs))

;; (import (prefix mtargs args:)
;; 	debugprint)
;; 
;; (use sql-de-lite) ;; srfi-1 posix regex regex-case srfi-69 srfi-18 call-with-environment-variables)
;; 
;; (define (env:open-db fname)
;;   (let* ((db-exists (common:file-exists? fname))
;; 	 (db        (open-database fname)))
;;     (if (not db-exists)
;; 	(begin
;; 	  (exec (sql db "CREATE TABLE envvars (
;;                     id INTEGER PRIMARY KEY,
;;                     context TEXT NOT NULL,
;;                     var TEXT NOT NULL,
;;                     val TEXT NOT NULL,
;;                        CONSTRAINT envvars_constraint UNIQUE (context,var))"))))
;;     (set-busy-handler! db (busy-timeout 10000))
;;     db))
;; 
;; ;; save vars in given context, this is NOT incremental by default
;; ;;
;; (define (env:save-env-vars db context #!key (incremental #f)(vardat #f))
;;   (with-transaction
;;    db
;;    (lambda ()
;;      ;; first clear out any vars for this context
;;      (if (not incremental)(exec (sql db "DELETE FROM envvars WHERE context=?") context))
;;      (for-each
;;       (lambda (varval)
;; 	(let ((var (car varval))
;; 	      (val (cdr varval)))
;; 	  (if incremental (exec (sql db "DELETE FROM envvars WHERE context=? AND var=?") context var))
;; 	  (exec (sql db "INSERT INTO envvars (context,var,val) VALUES (?,?,?)") context var val)))
;; 	(if vardat
;; 	    (hash-table->alist vardat)
;; 	    (get-environment-variables))))))
;; 
;; ;; merge contexts in the order given
;; ;;  - each context is applied in the given order
;; ;;  - variables in the paths list are split on the separator and the components
;; ;;    merged using simple delta addition
;; ;;    returns a hash of the merged vars
;; ;;
;; (define (env:merge-contexts db basecontext contexts paths)
;;   (let ((result (make-hash-table)))
;;     (for-each
;;      (lambda (context)
;;        (query
;; 	(for-each-row
;; 	 (lambda (row)
;; 	   (let ((var  (car row))
;; 		 (val  (cadr row)))
;; 	     (hash-table-set! result var 
;; 			      (if (and (hash-table-ref/default result var #f)
;; 				       (assoc var paths)) ;; this var is a path and there is a previous path
;; 				  (let ((sep (cadr (assoc var paths))))
;; 				    (env:merge-path-envvar sep (hash-table-ref result var) val))
;; 				  val)))))
;; 	(sql db "SELECT var,val FROM envvars WHERE context=?")
;; 	context))
;;      contexts)
;;     result))
;; 
;; ;;  get list of removed variables between two contexts
;; ;;
;; (define (env:get-removed db contexta contextb)
;;   (let ((result (make-hash-table)))
;;     (query
;;      (for-each-row
;;       (lambda (row)
;; 	(let ((var  (car row))
;; 	      (val  (cadr row)))
;; 	  (hash-table-set! result var val))))
;;      (sql db "SELECT var,val FROM envvars WHERE context=? AND var NOT IN (SELECT var FROM envvars WHERE context=?)")
;;      contexta contextb)
;;     result))
;; 
;; ;;  get list of variables added to contextb from contexta
;; ;;
;; (define (env:get-added db contexta contextb)
;;   (let ((result (make-hash-table)))
;;     (query
;;      (for-each-row
;;       (lambda (row)
;; 	(let ((var  (car row))
;; 	      (val  (cadr row)))
;; 	  (hash-table-set! result var val))))
;;      (sql db "SELECT var,val FROM envvars WHERE context=? AND var NOT IN (SELECT var FROM envvars WHERE context=?)")
;;      contextb contexta)
;;     result))
;; 
;; ;;  get list of variables in both contexta and contexb that have been changed
;; ;;
;; (define (env:get-changed db contexta contextb)
;;   (let ((result (make-hash-table)))
;;     (query
;;      (for-each-row
;;       (lambda (row)
;; 	(let ((var  (car row))
;; 	      (val  (cadr row)))
;; 	  (hash-table-set! result var val))))
;;      (sql db "SELECT var,val FROM envvars AS a WHERE context=? AND val != (SELECT val FROM envvars WHERE var=a.var AND context=?)")
;;      contextb contexta)
;;     result))

;; 
;; ;;
;; (define (env:blind-merge l1 l2)
;;   (if (null? l1) l2
;;       (if (null? l2) l1
;; 	  (cons (car l1) (cons (car l2) (env:blind-merge (cdr l1) (cdr l2)))))))
;; 
;; ;; given a before and an after envvar calculate a new merged path
;; ;;
;; (define (env:merge-path-envvar separator patha pathb)
;;   (let* ((patha-parts  (string-split patha separator))
;; 	 (pathb-parts  (string-split pathb separator))
;; 	 (common-parts (lset-intersection equal? patha-parts pathb-parts))
;; 	 (final        (delete-duplicates ;; env:blind-merge 
;; 			(append pathb-parts common-parts patha-parts))))
;; ;;     (print "BEFORE:   " (string-intersperse patha-parts  "\n       "))
;; ;;     (print "AFTER:    " (string-intersperse pathb-parts  "\n       "))
;; ;;     (print "COMMON:   " (string-intersperse common-parts "\n       "))
;;     (string-intersperse final separator)))
;; 
;; (define (env:process-path-envvar varname separator patha pathb)
;;   (let ((newpath (env:merge-path-envvar separator patha pathb)))
;;     (setenv varname newpath)))
;; 
;; (define (env:have-context db context)
;;   (> (query fetch-value (sql db "SELECT count(id) FROM envvars WHERE context=?") context)
;;      0))
;; 
;; ;; this is so the calling block does not need to import sql-de-lite
;; (define (env:close-database db)
;;   (close-database db))
;; 
;; (define (env:lazy-hash-table->alist indat)
;;   (if (hash-table? indat)
;;       (let ((dat (hash-table->alist indat)))
;; 	(if (null? dat)
;; 	    #f 
;; 	    dat))
;;       #f))
;; 
;; (define (env:inc-path path)
;;   (print "PATH "
;; 	 (conc "#{scheme (env:min-path \"" path "\" \"#{getenv PATH}\")}")))
;; ;; 	 (conc
;; ;; 	  "#{scheme (string-intersperse "
;; ;; 	  "(delete-duplicates "
;; ;; 	  "(append (string-split \"" path "\" \":\") "
;; ;; 	  "(string-split \"#{getenv PATH}\" \":\")))"
;; ;; 	  " \":\")}")))
;; 
;; (define (env:min-path path1 path2)
;;   (string-intersperse
;;    (delete-duplicates
;;     (append
;;      (string-split path1 ":")
;;      (string-split path2 ":")))
;;    ":"))
;; 
;; ;; inc path will set a PATH that is incrementally modified when read - config mode only
;; ;;
;; (define (env:print added removed changed #!key (inc-path #t))
;;   (let ((a  (env:lazy-hash-table->alist added))
;; 	(r  (env:lazy-hash-table->alist removed))
;; 	(c  (env:lazy-hash-table->alist changed)))
;;     (case (if (args:get-arg "-dumpmode")
;; 	      (string->symbol (args:get-arg "-dumpmode"))
;; 	      'bash)
;;       ((bash)
;;        (if a
;; 	   (begin
;; 	     (print "# Added vars")
;; 	     (map (lambda (dat)(print "export " (car dat) "=" (cdr dat)))
;; 		  (hash-table->alist added))))
;;        (if r
;; 	   (begin
;; 	     (print "# Removed vars")
;; 	     (map (lambda (dat)(print "unset " (car dat)))
;; 		  (hash-table->alist removed))))
;;        (if c
;; 	   (begin
;; 	     (print "# Changed vars")
;; 	     (map (lambda (dat)(print "export " (car dat) "=" (cdr dat)))
;; 		  (hash-table->alist changed)))))
;;       ((csh)
;;        (if a
;; 	   (begin
;; 	     (print "# Added vars")
;; 	     (map (lambda (dat)(print "setenv " (car dat) " " (cdr dat)))
;; 		  (hash-table->alist added))))
;;        (if r
;; 	   (begin
;; 	     (print "# Removed vars")
;; 	     (map (lambda (dat)(print "unsetenv " (car dat)))
;; 		  (hash-table->alist removed))))
;;        (if c
;; 	   (begin
;; 	     (print "# Changed vars")
;; 	     (map (lambda (dat)(print "setenv " (car dat) " " (cdr dat)))
;; 		  (hash-table->alist changed)))))
;;       ((config ini)
;;        (if a
;; 	   (begin
;; 	     (print "# Added vars")
;; 	     (map (lambda (dat)
;; 		    (let ((var (car dat))
;; 			  (val (cdr dat)))
;; 		      (if (and inc-path
;; 			       (equal? var "PATH"))
;; 			  (env:inc-path val)
;; 			  (print var " " val))))
;; 		  (hash-table->alist added))))
;;        (if r
;; 	   (begin
;; 	     (print "# Removed vars")
;; 	     (map (lambda (dat)(print "#{scheme (unsetenv \"" (car dat) "\")}"))
;; 		  (hash-table->alist removed))))
;;        (if c
;; 	   (begin
;; 	     (print "# Changed vars")
;; 	     (map (lambda (dat)
;; 		    (let ((var (car dat))
;; 			  (val (cdr dat)))
;; 		      (if (and inc-path
;; 			       (equal? var "PATH"))
;; 			  (env:inc-path val)
;; 			  (print var " " val))))
;; 		  (hash-table->alist changed)))))
;;       (else
;;        (debug:print-error 0 *default-log-port* "No dumpmode specified, use -dumpmode [bash|csh|config]")))))
;;