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;;; swank-mit-scheme.scm --- SLIME server for MIT Scheme
;;
;; Copyright (C) 2008 Helmut Eller
;;
;; This file is licensed under the terms of the GNU General Public
;; License as distributed with Emacs (press C-h C-c for details).
;;;; Installation:
#|
1. You need MIT Scheme 9.2
2. The Emacs side needs some fiddling. I have the following in
my .emacs:
(setq slime-lisp-implementations
'((mit-scheme ("mit-scheme") :init mit-scheme-init)))
(defun mit-scheme-init (file encoding)
(format "%S\n\n"
`(begin
(load-option 'format)
(load-option 'sos)
(eval
'(create-package-from-description
(make-package-description '(swank) (list (list))
(vector) (vector) (vector) false))
(->environment '(package)))
(load ,(expand-file-name
".../contrib/swank-mit-scheme.scm" ; <-- insert your path
slime-path)
(->environment '(swank)))
(eval '(start-swank ,file) (->environment '(swank))))))
(defun mit-scheme ()
(interactive)
(slime 'mit-scheme))
(defun find-mit-scheme-package ()
(save-excursion
(let ((case-fold-search t))
(and (re-search-backward "^[;]+ package: \\((.+)\\).*$" nil t)
(match-string-no-properties 1)))))
(setq slime-find-buffer-package-function 'find-mit-scheme-package)
(add-hook 'scheme-mode-hook (lambda () (slime-mode 1)))
The `mit-scheme-init' function first loads the SOS and FORMAT
libraries, then creates a package "(swank)", and loads this file
into that package. Finally it starts the server.
`find-mit-scheme-package' tries to figure out which package the
buffer belongs to, assuming that ";;; package: (FOO)" appears
somewhere in the file. Luckily, this assumption is true for many of
MIT Scheme's own files. Alternatively, you could add Emacs style
-*- slime-buffer-package: "(FOO)" -*- file variables.
4. Start everything with `M-x mit-scheme'.
|#
;;; package: (swank)
(if (< (car (get-subsystem-version "Release"))
'9)
(error "This file requires MIT Scheme Release 9"))
(define (swank port)
(accept-connections (or port 4005) #f))
;; ### hardcoded port number for now. netcat-openbsd doesn't print
;; the listener port anymore.
(define (start-swank port-file)
(accept-connections 4055 port-file)
)
;;;; Networking
(define (accept-connections port port-file)
(let ((sock (open-tcp-server-socket port (host-address-loopback))))
(format #t "Listening on port: ~s~%" port)
(if port-file (write-port-file port port-file))
(dynamic-wind
(lambda () #f)
(lambda () (serve (tcp-server-connection-accept sock #t #f)))
(lambda () (close-tcp-server-socket sock)))))
(define (write-port-file portnumber filename)
(call-with-output-file filename (lambda (p) (write portnumber p))))
(define *top-level-restart* #f)
(define (serve socket)
(with-simple-restart
'disconnect "Close connection."
(lambda ()
(with-keyboard-interrupt-handler
(lambda () (main-loop socket))))))
(define (disconnect)
(format #t "Disconnecting ...~%")
(invoke-restart (find-restart 'disconnect)))
(define (main-loop socket)
(do () (#f)
(with-simple-restart
'abort "Return to SLIME top-level."
(lambda ()
(fluid-let ((*top-level-restart* (find-restart 'abort)))
(dispatch (read-packet socket) socket 0))))))
(define (with-keyboard-interrupt-handler fun)
(define (set-^G-handler exp)
(eval `(vector-set! keyboard-interrupt-vector (char->ascii #\G) ,exp)
(->environment '(runtime interrupt-handler))))
(dynamic-wind
(lambda () #f)
(lambda ()
(set-^G-handler
`(lambda (char) (with-simple-restart
'continue "Continue from interrupt."
(lambda () (error "Keyboard Interrupt.")))))
(fun))
(lambda ()
(set-^G-handler '^G-interrupt-handler))))
;;;; Reading/Writing of SLIME packets
(define (read-packet in)
"Read an S-expression from STREAM using the SLIME protocol."
(let* ((len (read-length in))
(buffer (make-string len)))
(fill-buffer! in buffer)
(read-from-string buffer)))
(define (write-packet message out)
(let* ((string (write-to-string message)))
(log-event "WRITE: [~a]~s~%" (string-length string) string)
(write-length (string-length string) out)
(write-string string out)
(flush-output out)))
(define (fill-buffer! in buffer)
(read-string! buffer in))
(define (read-length in)
(if (eof-object? (peek-char in)) (disconnect))
(do ((len 6 (1- len))
(sum 0 (+ (* sum 16) (char->hex-digit (read-char in)))))
((zero? len) sum)))
(define (ldb size position integer)
"LoaD a Byte of SIZE bits at bit position POSITION from INTEGER."
(fix:and (fix:lsh integer (- position))
(1- (fix:lsh 1 size))))
(define (write-length len out)
(do ((pos 20 (- pos 4)))
((< pos 0))
(write-hex-digit (ldb 4 pos len) out)))
(define (write-hex-digit n out)
(write-char (hex-digit->char n) out))
(define (hex-digit->char n)
(digit->char n 16))
(define (char->hex-digit c)
(char->digit c 16))
;;;; Event dispatching
(define (dispatch request socket level)
(log-event "READ: ~s~%" request)
(case (car request)
((:emacs-rex) (apply emacs-rex socket level (cdr request)))))
(define (swank-package)
(or (name->package '(swank))
(name->package '(user))))
(define *buffer-package* #f)
(define (find-buffer-package name)
(if (elisp-false? name)
#f
(let ((v (ignore-errors
(lambda () (name->package (read-from-string name))))))
(and (package? v) v))))
(define swank-env (->environment (swank-package)))
(define (user-env buffer-package)
(cond ((string? buffer-package)
(let ((p (find-buffer-package buffer-package)))
(if (not p) (error "Invalid package name: " buffer-package))
(package/environment p)))
(else (nearest-repl/environment))))
;; quote keywords
(define (hack-quotes list)
(map (lambda (x)
(cond ((symbol? x) `(quote ,x))
(#t x)))
list))
(define (emacs-rex socket level sexp package thread id)
(let ((ok? #f) (result #f) (condition #f))
(dynamic-wind
(lambda () #f)
(lambda ()
(bind-condition-handler
(list condition-type:serious-condition)
(lambda (c) (set! condition c) (invoke-sldb socket (1+ level) c))
(lambda ()
(fluid-let ((*buffer-package* package))
(set! result
(eval (cons* (car sexp) socket (hack-quotes (cdr sexp)))
swank-env))
(set! ok? #t)))))
(lambda ()
(write-packet `(:return
,(if ok? `(:ok ,result)
`(:abort
,(if condition
(format #f "~a"
(condition/type condition))
"<unknown reason>")))
,id)
socket)))))
(define (swank:connection-info _)
(let ((p (environment->package (user-env #f))))
`(:pid ,(unix/current-pid)
:package (:name ,(write-to-string (package/name p))
:prompt ,(write-to-string (package/name p)))
:lisp-implementation
(:type "MIT Scheme" :version ,(get-subsystem-version-string "release"))
:encoding (:coding-systems ("iso-8859-1"))
)))
(define (swank:quit-lisp _)
(%exit))
;;;; Evaluation
(define (swank-repl:listener-eval socket string)
;;(call-with-values (lambda () (eval-region string socket))
;; (lambda values `(:values . ,(map write-to-string values))))
`(:values ,(write-to-string (eval-region string socket))))
(define (eval-region string socket)
(let ((sexp (read-from-string string)))
(if (eof-object? exp)
(values)
(with-output-to-repl socket
(lambda () (eval sexp (user-env *buffer-package*)))))))
(define (with-output-to-repl socket fun)
(let ((p (make-port repl-port-type socket)))
(dynamic-wind
(lambda () #f)
(lambda () (with-output-to-port p fun))
(lambda () (flush-output p)))))
(define (swank:interactive-eval socket string)
;;(call-with-values (lambda () (eval-region string)) format-for-echo-area)
(format-values (eval-region string socket))
)
(define (format-values . values)
(if (null? values)
"; No value"
(with-string-output-port
(lambda (out)
(write-string "=> " out)
(do ((vs values (cdr vs))) ((null? vs))
(write (car vs) out)
(if (not (null? (cdr vs)))
(write-string ", " out)))))))
(define (swank:pprint-eval _ string)
(pprint-to-string (eval (read-from-string string)
(user-env *buffer-package*))))
(define (swank:interactive-eval-region socket string)
(format-values (eval-region string socket)))
(define (swank:set-package _ package)
(set-repl/environment! (nearest-repl)
(->environment (read-from-string package)))
(let* ((p (environment->package (user-env #f)))
(n (write-to-string (package/name p))))
(list n n)))
(define (repl-write-substring port string start end)
(cond ((< start end)
(write-packet `(:write-string ,(substring string start end))
(port/state port))))
(- end start))
(define (repl-write-char port char)
(write-packet `(:write-string ,(string char))
(port/state port)))
(define repl-port-type
(make-port-type `((write-substring ,repl-write-substring)
(write-char ,repl-write-char)) #f))
(define (swank-repl:create-repl socket . _)
(let* ((env (user-env #f))
(name (format #f "~a" (package/name (environment->package env)))))
(list name name)))
;;;; Compilation
(define (swank:compile-string-for-emacs _ string . x)
(apply
(lambda (errors seconds)
`(:compilation-result ,errors t ,seconds nil nil))
(call-compiler
(lambda ()
(let* ((sexps (snarf-string string))
(env (user-env *buffer-package*))
(scode (syntax `(begin ,@sexps) env))
(compiled-expression (compile-scode scode #t)))
(scode-eval compiled-expression env))))))
(define (snarf-string string)
(with-input-from-string string
(lambda ()
(let loop ()
(let ((e (read)))
(if (eof-object? e) '() (cons e (loop))))))))
(define (call-compiler fun)
(let ((time #f))
(with-timings fun
(lambda (run-time gc-time real-time)
(set! time real-time)))
(list 'nil (internal-time/ticks->seconds time))))
(define (swank:compiler-notes-for-emacs _) nil)
(define (swank:compile-file-for-emacs socket file load?)
(apply
(lambda (errors seconds)
(list ':compilation-result errors 't seconds load?
(->namestring (pathname-name file))))
(call-compiler
(lambda () (with-output-to-repl socket (lambda () (compile-file file)))))))
(define (swank:load-file socket file)
(with-output-to-repl socket
(lambda ()
(pprint-to-string
(load file (user-env *buffer-package*))))))
(define (swank:disassemble-form _ string)
(let ((sexp (let ((sexp (read-from-string string)))
(cond ((and (pair? sexp) (eq? (car sexp) 'quote))
(cadr sexp))
(#t sexp)))))
(with-output-to-string
(lambda ()
(compiler:disassemble
(eval sexp (user-env *buffer-package*)))))))
(define (swank:disassemble-symbol _ string)
(with-output-to-string
(lambda ()
(compiler:disassemble
(eval (read-from-string string)
(user-env *buffer-package*))))))
;;;; Macroexpansion
(define (swank:swank-macroexpand-all _ string)
(with-output-to-string
(lambda ()
(pp (syntax (read-from-string string)
(user-env *buffer-package*))))))
(define swank:swank-macroexpand-1 swank:swank-macroexpand-all)
(define swank:swank-macroexpand swank:swank-macroexpand-all)
;;; Arglist
(define (swank:operator-arglist socket name pack)
(let ((v (ignore-errors
(lambda ()
(string-trim-right
(with-output-to-string
(lambda ()
(carefully-pa
(eval (read-from-string name) (user-env pack))))))))))
(if (condition? v) 'nil v)))
(define (carefully-pa o)
(cond ((arity-dispatched-procedure? o)
;; MIT Scheme crashes for (pa /)
(display "arity-dispatched-procedure"))
((procedure? o) (pa o))
(else (error "Not a procedure"))))
;;; Some unimplemented stuff.
(define (swank:buffer-first-change . _) nil)
(define (swank:filename-to-modulename . _) nil)
(define (swank:swank-require . _) nil)
;; M-. is beyond my capabilities.
(define (swank:find-definitions-for-emacs . _) nil)
;;; Debugger
(define-structure (sldb-state (conc-name sldb-state.)) condition restarts)
(define *sldb-state* #f)
(define (invoke-sldb socket level condition)
(fluid-let ((*sldb-state* (make-sldb-state condition (bound-restarts))))
(dynamic-wind
(lambda () #f)
(lambda ()
(write-packet `(:debug 0 ,level ,@(sldb-info *sldb-state* 0 20))
socket)
(sldb-loop level socket))
(lambda ()
(write-packet `(:debug-return 0 ,level nil) socket)))))
(define (sldb-loop level socket)
(write-packet `(:debug-activate 0 ,level) socket)
(with-simple-restart
'abort (format #f "Return to SLDB level ~a." level)
(lambda () (dispatch (read-packet socket) socket level)))
(sldb-loop level socket))
(define (sldb-info state start end)
(let ((c (sldb-state.condition state))
(rs (sldb-state.restarts state)))
(list (list (condition/report-string c)
(format #f " [~a]" (%condition-type/name (condition/type c)))
nil)
(sldb-restarts rs)
(sldb-backtrace c start end)
;;'((0 "dummy frame"))
'())))
(define %condition-type/name
(eval '%condition-type/name (->environment '(runtime error-handler))))
(define (sldb-restarts restarts)
(map (lambda (r)
(list (symbol->string (restart/name r))
(with-string-output-port
(lambda (p) (write-restart-report r p)))))
restarts))
(define (swank:throw-to-toplevel . _)
(invoke-restart *top-level-restart*))
(define (swank:sldb-abort . _)
(abort (sldb-state.restarts *sldb-state*)))
(define (swank:sldb-continue . _)
(continue (sldb-state.restarts *sldb-state*)))
(define (swank:invoke-nth-restart-for-emacs _ _sldb-level n)
(invoke-restart (list-ref (sldb-state.restarts *sldb-state*) n)))
(define (swank:debugger-info-for-emacs _ from to)
(sldb-info *sldb-state* from to))
(define (swank:backtrace _ from to)
(sldb-backtrace (sldb-state.condition *sldb-state*) from to))
(define (sldb-backtrace condition from to)
(sldb-backtrace-aux (condition/continuation condition) from to))
(define (sldb-backtrace-aux k from to)
(let ((l (map frame>string (substream (continuation>frames k) from to))))
(let loop ((i from) (l l))
(if (null? l)
'()
(cons (list i (car l)) (loop (1+ i) (cdr l)))))))
;; Stack parser fails for this:
;; (map (lambda (x) x) "/tmp/x.x")
(define (continuation>frames k)
(let loop ((frame (continuation->stack-frame k)))
(cond ((not frame) (stream))
(else
(let ((next (ignore-errors
(lambda () (stack-frame/next-subproblem frame)))))
(cons-stream frame
(if (condition? next)
(stream next)
(loop next))))))))
(define (frame>string frame)
(if (condition? frame)
(format #f "Bogus frame: ~a ~a" frame
(condition/report-string frame))
(with-string-output-port (lambda (p) (print-frame frame p)))))
(define (print-frame frame port)
(define (invalid-subexpression? subexpression)
(or (debugging-info/undefined-expression? subexpression)
(debugging-info/unknown-expression? subexpression)))
(define (invalid-expression? expression)
(or (debugging-info/undefined-expression? expression)
(debugging-info/compiled-code? expression)))
(with-values (lambda () (stack-frame/debugging-info frame))
(lambda (expression environment subexpression)
(cond ((debugging-info/compiled-code? expression)
(write-string ";unknown compiled code" port))
((not (debugging-info/undefined-expression? expression))
(fluid-let ((*unparse-primitives-by-name?* #t))
(write
(unsyntax (if (invalid-subexpression? subexpression)
expression
subexpression))
port)))
((debugging-info/noise? expression)
(write-string ";" port)
(write-string ((debugging-info/noise expression) #f)
port))
(else
(write-string ";undefined expression" port))))))
(define (substream s from to)
(let loop ((i 0) (l '()) (s s))
(cond ((or (= i to) (stream-null? s)) (reverse l))
((< i from) (loop (1+ i) l (stream-cdr s)))
(else (loop (1+ i) (cons (stream-car s) l) (stream-cdr s))))))
(define (swank:frame-locals-and-catch-tags _ frame)
(list (map frame-var>elisp (frame-vars (sldb-get-frame frame)))
'()))
(define (frame-vars frame)
(with-values (lambda () (stack-frame/debugging-info frame))
(lambda (expression environment subexpression)
(cond ((environment? environment)
(environment>frame-vars environment))
(else '())))))
(define (environment>frame-vars environment)
(let loop ((e environment))
(cond ((environment->package e) '())
(else (append (environment-bindings e)
(if (environment-has-parent? e)
(loop (environment-parent e))
'()))))))
(define (frame-var>elisp b)
(list ':name (write-to-string (car b))
':value (cond ((null? (cdr b)) "{unavailable}")
(else (>line (cadr b))))
':id 0))
(define (sldb-get-frame index)
(stream-ref (continuation>frames
(condition/continuation
(sldb-state.condition *sldb-state*)))
index))
(define (frame-var-value frame var)
(let ((binding (list-ref (frame-vars frame) var)))
(cond ((cdr binding) (cadr binding))
(else unspecific))))
(define (swank:inspect-frame-var _ frame var)
(reset-inspector)
(inspect-object (frame-var-value (sldb-get-frame frame) var)))
;;;; Completion
(define (swank:simple-completions _ string package)
(let ((strings (all-completions string (user-env package) string-prefix?)))
(list (sort strings string<?)
(longest-common-prefix strings))))
(define (all-completions pattern env match?)
(let ((ss (map %symbol->string (environment-names env))))
(keep-matching-items ss (lambda (s) (match? pattern s)))))
;; symbol->string is too slow
(define %symbol->string symbol-name)
(define (environment-names env)
(append (environment-bound-names env)
(if (environment-has-parent? env)
(environment-names (environment-parent env))
'())))
(define (longest-common-prefix strings)
(define (common-prefix s1 s2)
(substring s1 0 (string-match-forward s1 s2)))
(reduce common-prefix "" strings))
;;;; Apropos
(define (swank:apropos-list-for-emacs _ name #!optional
external-only case-sensitive package)
(let* ((pkg (and (string? package)
(find-package (read-from-string package))))
(parent (and (not (default-object? external-only))
(elisp-false? external-only)))
(ss (append-map (lambda (p)
(map (lambda (s) (cons p s))
(apropos-list name p (and pkg parent))))
(if pkg (list pkg) (all-packages))))
(ss (sublist ss 0 (min (length ss) 200))))
(map (lambda (e)
(let ((p (car e)) (s (cdr e)))
(list ':designator (format #f "~a ~a" s (package/name p))
':variable (>line
(ignore-errors
(lambda () (package-lookup p s)))))))
ss)))
(define (swank:list-all-package-names . _)
(map (lambda (p) (write-to-string (package/name p)))
(all-packages)))
(define (all-packages)
(define (package-and-children package)
(append (list package)
(append-map package-and-children (package/children package))))
(package-and-children system-global-package))
;;;; Inspector
(define-structure (inspector-state (conc-name istate.))
object parts next previous content)
(define istate #f)
(define (reset-inspector)
(set! istate #f))
(define (swank:init-inspector _ string)
(reset-inspector)
(inspect-object (eval (read-from-string string)
(user-env *buffer-package*))))
(define (inspect-object o)
(let ((previous istate)
(content (inspect o))
(parts (make-eqv-hash-table)))
(set! istate (make-inspector-state o parts #f previous content))
(if previous (set-istate.next! previous istate))
(istate>elisp istate)))
(define (istate>elisp istate)
(list ':title (>line (istate.object istate))
':id (assign-index (istate.object istate) (istate.parts istate))
':content (prepare-range (istate.parts istate)
(istate.content istate)
0 500)))
(define (assign-index o parts)
(let ((i (hash-table/count parts)))
(hash-table/put! parts i o)
i))
(define (prepare-range parts content from to)
(let* ((cs (substream content from to))
(ps (prepare-parts cs parts)))
(list ps
(if (< (length cs) (- to from))
(+ from (length cs))
(+ to 1000))
from to)))
(define (prepare-parts ps parts)
(define (line label value)
`(,(format #f "~a: " label)
(:value ,(>line value) ,(assign-index value parts))
"\n"))
(append-map (lambda (p)
(cond ((string? p) (list p))
((symbol? p) (list (symbol->string p)))
(#t
(case (car p)
((line) (apply line (cdr p)))
(else (error "Invalid part:" p))))))
ps))
(define (swank:inspect-nth-part _ index)
(inspect-object (hash-table/get (istate.parts istate) index 'no-such-part)))
(define (swank:quit-inspector _)
(reset-inspector))
(define (swank:inspector-pop _)
(cond ((istate.previous istate)
(set! istate (istate.previous istate))
(istate>elisp istate))
(else 'nil)))
(define (swank:inspector-next _)
(cond ((istate.next istate)
(set! istate (istate.next istate))
(istate>elisp istate))
(else 'nil)))
(define (swank:inspector-range _ from to)
(prepare-range (istate.parts istate)
(istate.content istate)
from to))
(define-syntax stream*
(syntax-rules ()
((stream* tail) tail)
((stream* e1 e2 ...) (cons-stream e1 (stream* e2 ...)))))
(define (iline label value) `(line ,label ,value))
(define-generic inspect (o))
(define-method inspect ((o <object>))
(cond ((environment? o) (inspect-environment o))
((vector? o) (inspect-vector o))
((procedure? o) (inspect-procedure o))
((compiled-code-block? o) (inspect-code-block o))
;;((system-pair? o) (inspect-system-pair o))
((probably-scode? o) (inspect-scode o))
(else (inspect-fallback o))))
(define (inspect-fallback o)
(let* ((class (object-class o))
(slots (class-slots class)))
(stream*
(iline "Class" class)
(let loop ((slots slots))
(cond ((null? slots) (stream))
(else
(let ((n (slot-name (car slots))))
(stream* (iline n (slot-value o n))
(loop (cdr slots))))))))))
(define-method inspect ((o <pair>))
(if (or (pair? (cdr o)) (null? (cdr o)))
(inspect-list o)
(inspect-cons o)))
(define (inspect-cons o)
(stream (iline "car" (car o))
(iline "cdr" (cdr o))))
(define (inspect-list o)
(let loop ((i 0) (o o))
(cond ((null? o) (stream))
((or (pair? (cdr o)) (null? (cdr o)))
(stream* (iline i (car o))
(loop (1+ i) (cdr o))))
(else
(stream (iline i (car o))
(iline "tail" (cdr o)))))))
(define (inspect-environment o)
(stream*
(iline "(package)" (environment->package o))
(let loop ((bs (environment-bindings o)))
(cond ((null? bs)
(if (environment-has-parent? o)
(stream (iline "(<parent>)" (environment-parent o)))
(stream)))
(else
(let* ((b (car bs)) (s (car b)))
(cond ((null? (cdr b))
(stream* s " {" (environment-reference-type o s) "}\n"
(loop (cdr bs))))
(else
(stream* (iline s (cadr b))
(loop (cdr bs)))))))))))
(define (inspect-vector o)
(let ((len (vector-length o)))
(let loop ((i 0))
(cond ((= i len) (stream))
(else (stream* (iline i (vector-ref o i))
(loop (1+ i))))))))
(define (inspect-procedure o)
(cond ((primitive-procedure? o)
(stream (iline "name" (primitive-procedure-name o))
(iline "arity" (primitive-procedure-arity o))
(iline "doc" (primitive-procedure-documentation o))))
((compound-procedure? o)
(stream (iline "arity" (procedure-arity o))
(iline "lambda" (procedure-lambda o))
(iline "env" (ignore-errors
(lambda () (procedure-environment o))))))
(else
(stream
(iline "block" (compiled-entry/block o))
(with-output-to-string (lambda () (compiler:disassemble o)))))))
(define (inspect-code-block o)
(stream-append
(let loop ((i (compiled-code-block/constants-start o)))
(cond ((>= i (compiled-code-block/constants-end o)) (stream))
(else
(stream*
(iline i (system-vector-ref o i))
(loop (+ i compiled-code-block/bytes-per-object))))))
(stream (iline "debuginfo" (compiled-code-block/debugging-info o))
(iline "env" (compiled-code-block/environment o))
(with-output-to-string (lambda () (compiler:disassemble o))))))
(define (inspect-scode o)
(stream (pprint-to-string o)))
(define (probably-scode? o)
(define tests (list access? assignment? combination? comment?
conditional? definition? delay? disjunction? lambda?
quotation? sequence? the-environment? variable?))
(let loop ((tests tests))
(cond ((null? tests) #f)
(((car tests) o))
(else (loop (cdr tests))))))
(define (inspect-system-pair o)
(stream (iline "car" (system-pair-car o))
(iline "cdr" (system-pair-cdr o))))
;;;; Auxilary functions
(define nil '())
(define t 't)
(define (elisp-false? o) (member o '(nil ())))
(define (elisp-true? o) (not (elisp-false? o)))
(define (>line o)
(let ((r (write-to-string o 100)))
(cond ((not (car r)) (cdr r))
(else (string-append (cdr r) " ..")))))
;; Must compile >line otherwise we can't write unassigend-reference-traps.
(set! >line (compile-procedure >line))
(define (read-from-string s) (with-input-from-string s read))
(define (pprint-to-string o)
(with-string-output-port
(lambda (p)
(fluid-let ((*unparser-list-breadth-limit* 10)
(*unparser-list-depth-limit* 4)
(*unparser-string-length-limit* 100))
(pp o p)))))
;(define (1+ n) (+ n 1))
(define (1- n) (- n 1))
(define (package-lookup package name)
(let ((p (if (package? package) package (find-package package))))
(environment-lookup (package/environment p) name)))
(define log-port (current-output-port))
(define (log-event fstring . args)
;;(apply format log-port fstring args)
#f
)
;;; swank-mit-scheme.scm ends here