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;;; geiser.ss -- emacs/scheme interface
;; Copyright (c) 2022 Jose A Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Tue Apr 26 22:27:26 2016 +0200
(library (geiser)
(export geiser:eval
geiser:completions
geiser:module-completions
geiser:autodoc
geiser:no-values
geiser:load-file
geiser:newline
geiser:macroexpand
geiser:symbol-location
geiser:module-location
geiser:add-to-load-path)
(import (chezscheme))
(import (geiser-data))
(define-syntax as-string
(syntax-rules () ((_ b ...) (with-output-to-string (lambda () b ...)))))
(define (write-to-string x) (as-string (write x)))
(define (pretty-string x)
(parameterize ((print-extended-identifiers #t)
(print-vector-length #t))
(as-string (pretty-print x))))
(define (call-with-result thunk)
(let ((output-string (open-output-string)))
(write
(call/cc
(lambda (k)
(with-exception-handler
(lambda (e)
(debug-condition e) ; save the condition for the debugger
(k `((result "")
(output . ,(get-output-string output-string))
(error (key . condition)
(msg . ,(as-string (display-condition e)))))))
(lambda ()
(call-with-values
(lambda ()
(parameterize ((current-output-port output-string)) (thunk)))
(lambda result
`((result ,(write-to-string
(if (null? (cdr result)) (car result) result)))
(output . ,(get-output-string output-string))))))))))
(newline)
(close-output-port output-string)))
(define (last-index-of str-list char idx last-idx)
(if (null? str-list)
last-idx
(last-index-of (cdr str-list) char (+ 1 idx)
(if (char=? char (car str-list)) idx last-idx))))
(define (with-extension name ext)
(let ((idx (last-index-of (string->list name) #\. 0 -1)))
(if (= idx -1)
(string-append name ext)
(string-append (substring name 0 idx) ext))))
(define (obj-file-name name) (with-extension name ".so"))
(define (file-directory filename)
(let ((idx (last-index-of (string->list filename) #\/ 0 -1)))
(if (= idx -1) filename (substring filename 0 idx))))
(define (geiser:load-file filename)
(let ((output-filename (obj-file-name filename)))
(call-with-result
(lambda ()
(parameterize ([current-directory (file-directory filename)])
(with-output-to-string
(lambda () (maybe-compile-file filename output-filename)))
(load output-filename))))))
(define (geiser:add-to-load-path path)
(let ((p (cons path path)))
(library-directories (cons p (remove p (library-directories))))))
(define string-prefix?
(lambda (x y)
(let ([n (string-length x)])
(and (fx<= n (string-length y))
(let prefix? ([i 0])
(or (fx= i n)
(and (char=? (string-ref x i) (string-ref y i))
(prefix? (fx+ i 1)))))))))
(define (geiser:completions prefix . rest)
(sort string-ci<?
(filter (lambda (el)
(string-prefix? prefix el))
(map write-to-string
(environment-symbols (interaction-environment))))))
(define not-found (gensym))
(define current-environment (make-parameter environment?))
(define (module-env env)
(cond ((environment? env) env)
((list? env) (environment env))
(else #f)))
(define (try-eval sym . env)
(call/cc
(lambda (k)
(with-exception-handler (lambda (e) (k not-found))
(let ((env (and (not (null? env)) (module-env (car env)))))
(lambda () (if env (eval sym env) (eval sym))))))))
(define (geiser:eval module form)
(call-with-result
(lambda ()
(parameterize ((current-environment (module-env module)))
(if (environment? (current-environment))
(eval form (current-environment))
(eval form))))))
(define (geiser:module-completions prefix . rest)
(define (substring? s1 s2)
(let ([n1 (string-length s1)] [n2 (string-length s2)])
(let loop2 ([i2 0])
(let loop1 ([i1 0] [j i2])
(if (fx= i1 n1)
i2
(and (not (fx= j n2))
(if (char=? (string-ref s1 i1) (string-ref s2 j))
(loop1 (fx+ i1 1) (fx+ j 1))
(loop2 (fx+ i2 1)))))))))
(filter (lambda (el)
(substring? prefix el))
(map write-to-string (library-list))))
(define (arity->parameter-list p)
(define (nparams n)
(map (lambda (n) (string->symbol (format "x~a" n))) (iota n)))
(define (add-opt pl)
(cons (append (if (null? pl) '() (car pl)) '(...)) pl))
(let* ((m (procedure-arity-mask p))
(pm (if (< m 0) (+ 1 (lognot m)) m))
(n (if (> pm 0) (/ (log pm) (log 2)) 0)))
(let loop ((k 1) (pl '()))
(cond ((> k n) (reverse (if (< m 0) (add-opt pl) pl)))
((logbit? k pm) (loop (+ k 1) (cons (nparams k) pl)))
(else (loop (+ k 1) pl))))))
(define (source->parameter-list p)
;; same as (inspect object), then hitting c
(let* ((s (((inspect/object p) 'code) 'source))
(form (and s (s 'value))))
(and (list? form)
(>= (length form) 2)
(case (car form)
[(lambda) (list (cadr form))]
[(case-lambda) (map car (cdr form))]
[(record-predicate record-accessor)
(list (list (record-type-name (cadr (cadr form)))))]
[(record-mutator)
(let ([rtd (cadr (cadr form))]
[field-idx (caddr form)])
(list (list (record-type-name rtd)
(vector-ref (record-type-field-names rtd)
field-idx))))]
[(record-constructor)
(let* ([rcd (cadr (cadr form))]
[rtd (((inspect/object rcd) 'ref 'rtd) 'value)])
(list (vector->list (record-type-field-names rtd))))]
[else #f]))))
(define (value->string x)
(define max-len 80)
(define sub-str "...")
(define sub-len (- max-len (string-length sub-str)))
(let* ((s (pretty-string x))
(l (string-length s)))
(if (<= l max-len) s (string-append (substring s 0 sub-len) sub-str))))
(define (docs->parameter-list id)
(let ((s (symbol-signature id)))
(and s (list s))))
(define (operator-arglist operator)
(define (procedure-parameter-list id p)
(and (procedure? p)
(or (source->parameter-list p)
(docs->parameter-list id)
(arity->parameter-list p))))
(define (autodoc-arglist* args req)
(cond ((null? args) (list (list* "required" (reverse req))))
((pair? args) (autodoc-arglist* (cdr args) (cons (car args) req)))
(else `(("required" . ,(reverse req))
("optional" ,args)))))
(define (autodoc-arglist arglist) (autodoc-arglist* arglist '()))
(let ([binding (try-eval operator)])
(if (not (eq? binding not-found))
(let ([arglists (procedure-parameter-list operator binding)])
(cond ((null? arglists) `(,operator ("args" (("required")))))
(arglists
`(,operator ("args" ,@(map autodoc-arglist arglists))))
(else `(,operator ("value" . ,(value->string binding))))))
(let ((s (symbol-signature operator)))
(if s `(,operator ("args" (("required" ,@s)))) '())))))
(define (geiser:autodoc ids)
(cond ((null? ids) '())
((not (list? ids)) (geiser:autodoc (list ids)))
((not (symbol? (car ids))) (geiser:autodoc (cdr ids)))
(else (map operator-arglist ids))))
(define (geiser:symbol-location id . env)
(let* ([b (try-eval id (current-environment))]
[c (and (not (eq? not-found b))
((inspect/object b) 'code))])
(if c
(call-with-values (lambda () (c 'source-path))
(lambda (path line . col)
(let ((line (if (null? col) '() line))
(char (if (null? col) line '()))
(col (if (null? col) '() (car col))))
`(("name" . ,(c 'name))
("file" . ,path)
("line" . ,line)
("column" . ,col)
("char" . ,char)))))
'())))
(define (geiser:module-location id)
(let ((obj (library-object-filename id)))
(let loop ((exts (if obj (map car (library-extensions)) '())))
(cond ((null? exts) '())
((file-exists? (with-extension obj (car exts)))
`(("file" . ,(with-extension obj (car exts)))))
(else (loop (cdr exts)))))))
(define (geiser:no-values) #f)
(define (geiser:newline) #f)
(define (geiser:macroexpand form . rest)
(with-output-to-string
(lambda () (pretty-print (syntax->datum (expand form)))))))
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