;;;Writes comparison of two autolisp (or other ASCII) files to a file named <filename#1>-<filename#2>.<ext#1>
;;;in the same folder as <filename#1>.
;;;
;;;>	Author:	Henry C. Francis
;;;>		425 N. Ashe St.
;;;>		Southern Pines, NC 28387
;;;>		http://paracadd.com
;;;>		All rights reserved.
;;;
;;;>		COPYRIGHT: 8-10-2006
;;;>		   EDITED: 08-10-2006
;;;
(defun c:comparefiles ( / path#1 open#1 read#1 file#1_lst cnt#1 path#2 open#2 read#2 file#2_lst cnt#2 princ_cnt#1 princ_cnt#2)
  (setq old_compfiles_error *error*)
  (setq *error* compfiles_error)
  (setq file#1 (getfiled "First file to compare" (if file#1 file#1 "") "lsp;_ls" 4))
  (setq path#1 (dos_splitpath file#1))
  (setq file#2 (getfiled "First file to compare" (if file#2 file#2 (IF path#1 (CADDR path#1) "")) "lsp;_ls" 4))
  (setq path#2 (dos_splitpath file#2))
  (if (and file#1 file#2)
    (progn
      (setq open#1 (open file#1 "r"))
      (while (setq read#1 (read-line open#1))
        (setq file#1_lst (append file#1_lst (list read#1)))
      )
      (close open#1)
      (setq open#2 (open file#2 "r"))
      (while (setq read#2 (read-line open#2))
        (setq file#2_lst (append file#2_lst (list read#2)))
      )
      (close open#2)
      (setq cnt#1 1)
      (setq compout (open (strcat (car path#1)(cadr path#1)(caddr path#1)"-"(caddr path#2)(cadddr path#1)) "w"))
      (princ"\n\nThe following lines in:    \"" compout)
      (princ file#1 compout)
      (princ "\"\n       do not exist in:    \"" compout)
      (princ file#2 compout)
      (princ "\"\n" compout)
      (foreach n file#1_lst
        (if (member n file#2_lst)
          nil
          (progn
            (if (and princ_cnt#1 (eq princ_cnt#1 (1- cnt#1)))
              nil
              (if (and princ_cnt#1 (< princ_cnt#1 (1- cnt#1)))
                (princ "\n" compout)
              )
            )
            (setq princ_cnt#1 cnt#1)
            (COND
              ((< cnt#1 10)(princ "\n    " compout))
              ((< cnt#1 100)(princ "\n   " compout))
              ((< cnt#1 1000)(princ "\n  " compout))
              ((< cnt#1 10000)(princ "\n " compout))
              ((< cnt#1 100000)(princ "\n" compout))
            )
            (princ cnt#1 compout)
            (princ ": " compout)
            (princ n compout)
            (princ)
          )
        )
        (setq cnt#1 (1+ cnt#1))
      )
      (setq cnt#2 1)
      (princ"\n\nThe following lines in:    \"" compout)
      (princ file#2 compout)
      (princ "\"\n       do not exist in:    \"" compout)
      (princ file#1 compout)
      (princ "\"\n" compout)
      (foreach n file#2_lst
        (if (member n file#1_lst)
          nil
          (progn
            (if (and princ_cnt#2 (eq princ_cnt#2 (1- cnt#2)))
              nil
              (if (and princ_cnt#2 (< princ_cnt#2 (1- cnt#2)))
                (princ "\n" compout)
              )
            )
            (setq princ_cnt#2 cnt#2)
            (COND
              ((< cnt#2 10)(princ "\n    " compout))
              ((< cnt#2 100)(princ "\n   " compout))
              ((< cnt#2 1000)(princ "\n  " compout))
              ((< cnt#2 10000)(princ "\n " compout))
              ((< cnt#2 100000)(princ "\n" compout))
            )
            (princ cnt#2 compout)
            (princ ": " compout)
            (princ n compout)
            (princ)
          )
        )
        (setq cnt#2 (1+ cnt#2))
      )
      (close compout)
    )
  )
  (setq *error* old_compfiles_error)
  (princ)
)
(defun compfiles_error (msg / )
  (princ "\nERROR: ")
  (princ msg)
  (if open#1 (close open#1))
  (if open#2 (close open#2))
  (if compout (close compout))
  (setq *error* old_compfiles_error)
  (princ)
)