editors/scel/el/sclang-util.el

   1 ;; copyright 2003-2005 stefan kersten <steve@k-hornz.de>
   2 ;;
   3 ;; This program is free software; you can redistribute it and/or
   4 ;; modify it under the terms of the GNU General Public License as
   5 ;; published by the Free Software Foundation; either version 2 of the
   6 ;; License, or (at your option) any later version.
   7 ;;
   8 ;; This program is distributed in the hope that it will be useful, but
   9 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
  10 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 ;; General Public License for more details.
  12 ;;
  13 ;; You should have received a copy of the GNU General Public License
  14 ;; along with this program; if not, write to the Free Software
  15 ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
  16 ;; USA
  17
  18 (defun sclang-message (string &rest args)
  19   (message "SCLang: %s" (apply 'format string args)))
  20
  21 (defun sclang-make-buffer-name (string &optional private-p)
  22   (concat (and private-p " ") "*SCLang:" string "*"))
  23
  24 (defun sclang-make-prompt-string (prompt default)
  25   (if (and default (string-match "\\(:\\)\\s *" prompt))
  26       (replace-match
  27        (format " (default %s):" default)
  28        'fixedcase 'literal prompt 1)
  29     prompt))
  30
  31 (defun sclang-string-to-int32 (str)
  32   "Convert first 4 bytes of str (network byteorder) to 32 bit integer."
  33   (logior (lsh (logand (aref str 0) #XFF) 24)
  34           (lsh (logand (aref str 1) #XFF) 16)
  35           (lsh (logand (aref str 2) #XFF) 8)
  36           (logand (aref str 3) #XFF)))
  37
  38 (defun sclang-int32-to-string (n)
  39   "Convert 32 bit integer n to 4 byte string (network byte order)."
  40   (let ((str (make-string 4 0)))
  41     (aset str 0 (logand (lsh n -24) #XFF))
  42     (aset str 1 (logand (lsh n -16) #XFF))
  43     (aset str 2 (logand (lsh n  -8) #XFF))
  44     (aset str 3 (logand          n  #XFF))
  45     str))
  46
  47 (defun sclang-compress-newlines (&optional buffer)
  48   (with-current-buffer (or buffer (current-buffer))
  49     (save-excursion
  50       (goto-char (point-min))
  51       (while (not (eobp))
  52         (if (and (bolp) (eolp)
  53                  (save-excursion
  54                    (forward-line -1)
  55                    (and (bolp) (eolp))))
  56             (delete-char 1)
  57           (forward-line 1))))))
  58
  59 (eval-when-compile
  60   (defmacro sclang-save-buffer-state (varlist &rest body)
  61     "Bind variables according to VARLIST and eval BODY restoring buffer state."
  62     `(let* ,(append varlist
  63                     '((modified (buffer-modified-p)) (buffer-undo-list t)
  64                       (inhibit-read-only t) (inhibit-point-motion-hooks t)
  65                       (inhibit-modification-hooks t)
  66                       deactivate-mark buffer-file-name buffer-file-truename))
  67        (unwind-protect
  68            ,@body
  69          (when (and (not modified) (buffer-modified-p))
  70            (set-buffer-modified-p nil))))))
  71
  72 ;; (defun sclang-create-image (file-name &rest props)
  73 ;;   (when (file-exists-p file-name)
  74 ;;     (let ((coding-system-for-read 'no-conversion)
  75 ;;        (coding-system-for-write 'no-conversion)
  76 ;;        (inhibit-quit t))
  77 ;;       (with-temp-buffer
  78 ;;      (when (equal 0 (call-process "anytopnm" file-name (list (current-buffer) nil)))
  79 ;;        (apply
  80 ;;         'create-image
  81 ;;         (buffer-substring-no-properties (point-min) (point-max))
  82 ;;         nil t props))))))
  83
  84 (provide 'sclang-util)
  85
  86 ;; EOF