;;;; Functions that is soley for settings, craeting reading or writhin


(defun get_interface_list ()
  "Returns a 2D list of mtu value and interface.
First element is the MTU-Value(Integer), rest of the list is the Interface(String)"
  (let ((output (ext:run-shell-command "netsh interface ipv4 show subinterfaces" :output :stream))
	(split nil)
	(lines '()))
    (loop for line = (read-line output nil 'eof)
       until (eq line 'eof) do
	 (setf line (cl-utilities:SPLIT-SEQUENCE #\Space line :remove-empty-subseqs t))
	 (when line
	   (cond (split
		  (let* ((mtu-value (parse-integer (car line)))
			(interface (cdr (cdr (cdr (cdr line))))))
		    (if (listp interface)
			(setf line (cons mtu-value interface))
			(setf line (list mtu-value interface))))
		    (setf lines (cons line lines)))
		 ((equal (char (car line) 0) #\-)
		  (setf split t))))
	 )
    (reverse lines)))

(defun load_settings ()
  "Read the settings file if it exists"
  (with-open-file (stream "settings.ini" :if-does-not-exist nil)
    (if stream
	    (loop for line = (read-line stream nil 'eof)
	       until (eq line 'eof) do
		 (setf line (cl-utilities:SPLIT-SEQUENCE #\Space line :remove-empty-subseqs t))
		 (when line
		   (cond ((equal (car line) "mtu")
			      (setf *mtu* (parse-integer (car (cdr (cdr line))))))
			 ((equal (car line) "mtub")
			      (setf *mtub* (parse-integer (car (cdr (cdr line))))))
			 ((equal (car line) "interface")
			  (let ((temp  (format nil "~{~a ~}" (cdr (cdr line)))))
			    (setf *interface* (subseq temp 0 (- (length line) 1))))))))
	'None)))


(defun create_settings (interface)
  "Create settings"
  (setf *mtu* (car interface))
  (setf *mtub* (car interface))
  (let ((temp (format nil "~{~a ~}" (cdr interface))))
    (setf *interface* (subseq temp 0 (- (length temp) 1))))
  'created
  ;; Write to settings.ini
  )

Everything that has to do with the settings.ini file.

MTU-Changing program - Settings.lisp

Lisp