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.lispwords
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.lispwords
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":";if test -z "$LISP"; then LISP=ecl; fi
":";if test "$LISP" = clasp; then exec clasp --script $0
":";elif test "$LISP" = clisp; then exec clisp -q $0
":";elif test "$LISP" = clozure; then exec ccl -b -Q -l $0
":";elif test "$LISP" = ecl; then exec ecl -shell $0
":";elif test "$LISP" = sbcl; then exec sbcl --script $0
":";fi
;Dorai Sitaram
;Oct 8, 1999
;last change 2022-07-05
;this script takes lines of Lisp or Scheme code from its
;stdin and produces an indented version thereof on its
;stdout
(defvar *lisp-keywords* '())
(defun set-lisp-indent-number (sym num-of-subforms-to-be-indented-wide)
(declare (symbol sym) (integer num-of-subforms-to-be-indented-wide))
(let* ((x (symbol-name sym))
(c (assoc x *lisp-keywords* :test #'string-equal)))
(unless c
(push (setq c (cons x nil)) *lisp-keywords*))
(setf (cdr c) num-of-subforms-to-be-indented-wide)))
(defun retrieve-env (s)
(declare (string s))
#+(or abcl clasp clisp ecl) (ext:getenv s)
#+allegro (sys:getenv s)
#+clozure (ccl:getenv s)
#+cmucl (cdr (assoc (intern s :keyword)
ext:*environment-list* :test #'string=))
#+mkcl (mkcl:getenv s)
#+sbcl (sb-ext:posix-getenv s))
(defun read-home-lispwords ()
(with-open-file (i (or (retrieve-env "LISPWORDS")
(merge-pathnames ".lispwords" (user-homedir-pathname)))
:if-does-not-exist nil)
(when i
(loop
(let* ((w (or (read i nil) (return)))
(a w))
(unless (atom w)
(setq a (car w)))
(cond ((atom w)
(set-lisp-indent-number a 0))
((numberp a)
(mapc (lambda (x) (set-lisp-indent-number x a)) (cdr w)))
((consp a)
(let ((n (cadr w)))
(mapc (lambda (x) (set-lisp-indent-number x n)) a)))
(t (set-lisp-indent-number a (cadr w)))))))))
(defun past-next-atom (s i n)
(declare (string s) (integer i) (integer n))
(loop
(when (>= i n) (return n))
(let ((c (char s i)))
(cond ((char= c #\\) (incf i))
((member c '(#\space #\tab #\( #\) #\[ #\] #\" #\' #\` #\, #\;))
(return i))))
(incf i)))
(defun get-lisp-indent-number (s)
(declare (symbol s) (symbol raw-symbol-p))
(labels ((get-lisp-indent-number
(s &key (raw-symbol-p nil))
(or (cdr (assoc s *lisp-keywords* :test #'string-equal))
(cond ((eql (search "def" s :test #'char-equal) 0) 0)
(raw-symbol-p -1)
(t (let ((p (position #\: s :from-end t)))
(if p
(get-lisp-indent-number (subseq s (1+ p)) :raw-symbol-p t)
-1)))))))
(get-lisp-indent-number s)))
(defun literal-token-p (s)
(declare (string s))
(let ((colon-pos (position #\: s)))
(if colon-pos (= colon-pos 0)
(let ((s (read-from-string s)))
(or (characterp s) (numberp s) (stringp s))))))
(defstruct lparen
spaces-before
lisp-indent-num
num-finished-subforms)
(defun calc-subindent (s i n)
(declare (string s) (integer i) (integer n))
(let* ((j (past-next-atom s i n))
(lisp-indent-num 0)
(delta-indent
(if (= j i) 0
(let ((w (subseq s i j)))
(if (or (and (>= i 2) (member (char s (- i 2)) '(#\' #\`)))
(literal-token-p w)) 0
(progn (setq lisp-indent-num (get-lisp-indent-number w))
(case lisp-indent-num
(-2 0)
(-1 (if (< j n) (1+ (- j i)) 1))
(t 1))))))))
(values delta-indent lisp-indent-num j)))
(defun num-leading-spaces (s)
(declare (string s))
(let ((n (length s))
(i 0) (j 0))
(loop
(when (>= i n) (return 0))
(case (char s i)
(#\space (incf i) (incf j))
(#\tab (incf i) (incf j 8))
(t (return j))))))
(defun string-trim-blanks (s)
(declare (string s))
(string-trim '(#\space #\tab #\newline #\return) s))
(defun indent-lines ()
(let ((default-left-i -1) (left-i 0) (paren-stack '()) (inside-stringp nil))
(loop
(let* ((curr-line (or (read-line nil nil) (return)))
(leading-spaces (num-leading-spaces curr-line))
(curr-left-i
(cond (inside-stringp leading-spaces)
((null paren-stack)
(when (= left-i 0)
(when (= default-left-i -1)
(setq default-left-i leading-spaces))
(setq left-i default-left-i))
left-i)
(t (let* ((lp (car paren-stack))
(nas (lparen-lisp-indent-num lp))
(nfs (lparen-num-finished-subforms lp))
(extra-w 0))
(when (< nfs nas) ;(and (>= nas 0) (< nfs nas))
(incf (lparen-num-finished-subforms lp))
(setq extra-w 2))
(+ (lparen-spaces-before lp)
extra-w))))))
(setq curr-line (string-trim-blanks curr-line))
(unless (string= curr-line "")
(dotimes (k curr-left-i) (write-char #\space))
(princ curr-line))
(terpri)
;
(let ((i 0) (n (length curr-line)) (escapep nil)
(token-interstice-p nil))
(flet ((incr-finished-subforms ()
(unless token-interstice-p
(when paren-stack
(incf (lparen-num-finished-subforms
(car paren-stack))))
(setq token-interstice-p t))))
;
(loop
(when (>= i n) (return))
(let ((c (char curr-line i)))
(cond (escapep (setq escapep nil))
((char= c #\\) (setq token-interstice-p nil escapep t))
(inside-stringp (when (char= c #\")
(setq inside-stringp nil)
(incr-finished-subforms)))
((char= c #\;) (incr-finished-subforms) (return))
((char= c #\") (incr-finished-subforms) (setq inside-stringp t))
((member c '(#\space #\tab) :test #'char=)
(incr-finished-subforms))
((member c '(#\( #\[) :test #'char=)
(incr-finished-subforms)
(multiple-value-bind (delta-indent lisp-indent-num j)
(calc-subindent curr-line (1+ i) n)
(push (make-lparen :spaces-before (+ 1 i curr-left-i delta-indent)
:lisp-indent-num lisp-indent-num
:num-finished-subforms -1)
paren-stack)
(setq token-interstice-p t)
(let ((inext (1+ i)))
(when (> j inext)
(setq inext j token-interstice-p nil))
(setq i (1- inext)))))
((member c '(#\) #\]) :test #'char=)
(setq token-interstice-p nil)
(cond (paren-stack (pop paren-stack))
(t (setq left-i 0))))
(t (setq token-interstice-p nil))))
(incf i))
(incr-finished-subforms)))))))
(read-home-lispwords)
(indent-lines)
;eof