Category : Miscellaneous Language Source Code
Archive   : XLISP21D.ZIP
Filename : INIT.LSP

; initialization file for XLISP-PLUS 2.1c

(princ "XLISP-PLUS contains contributed code by:
Tom Almy, Mikael Pettersson, Neal Holtz, Johnny Greenblatt, Ken Whedbee,
Blake McBride, and Pete Yadlowsky.
Portions Copyright (c) 1988, Luke Tierney.\n")

(defun strcat (&rest str) ;; Backwards compatibility
(apply #'concatenate 'string str))


; (fmakunbound sym) - make a symbol function be unbound
(defun fmakunbound (sym) (setf (symbol-function sym) '*unbound*) sym)

; (mapcan fun list [ list ]...)
; (defmacro mapcan (&rest args) `(apply #'nconc (mapcar ,@args)))

; (mapcon fun list [ list ]...)
; (defmacro mapcon (&rest args) `(apply #'nconc (maplist ,@args)))

; (set-macro-character ch fun [ tflag ])
(defun set-macro-character (ch fun &optional tflag)
(setf (aref *readtable* (char-int ch))
(cons (if tflag :tmacro :nmacro) fun))
t)

; (get-macro-character ch)
(defun get-macro-character (ch)
(if (consp (aref *readtable* (char-int ch)))
(cdr (aref *readtable* (char-int ch)))
nil))

; (savefun fun) - save a function definition to a file
(defmacro savefun (fun)
`(let* ((fname (strcat (symbol-name ',fun) ".lsp"))
(fval (get-lambda-expression (symbol-function ',fun)))
(fp (open fname :direction :output)))
(cond (fp (print (cons (if (eq (car fval) 'lambda)
'defun
'defmacro)
(cons ',fun (cdr fval))) fp)
(close fp)
fname)
(t nil))))

; (debug) - enable debug breaks
(defun debug ()
(setq *breakenable* t))

; (nodebug) - disable debug breaks
(defun nodebug ()
(setq *breakenable* nil))

; initialize to enable breaks but no trace back
(setq *breakenable* t *tracenable* nil)


; macros get displaced with expansion
; Good feature -- but be warned that it creates self modifying code!
(setq *displace-macros* t)

; Enable the following to have DOS do the line editing
; (setq *dos-input* t)

;; Select one of these three choices
;; Other modes will not read in other standard lsp files


; print in upper case, case insensitive input
(setq *print-case* :upcase *readtable-case* :upcase)

; print in lower case
; (setq *print-case* :downcase *readtable-case* :upcase)

; case sensitive, lowercase and uppercase swapped (favors lower case)
; (setq *print-case* :downcase *readtable-case* :invert)


;; Define Class and Object to be class and object when in case sensitive
;; mode

(when (eq *readtable-case* :invert)
(defconstant Class class)
(defconstant Object object))