1 files changed, 155 insertions, 0 deletions
diff --git a/src/geiser/geiser.ss b/src/geiser/geiser.ss
new file mode 100644
index 0000000..33d1b39
--- /dev/null
+++ b/src/geiser/geiser.ss
@@ -0,0 +1,155 @@
+(library (geiser)
+  (export geiser:eval
+          geiser:completions
+          geiser:module-completions
+          geiser:autodoc
+          geiser:no-values
+          geiser:load-file
+          geiser:newline
+          geiser:macroexpand)
+  (import (chezscheme))
+
+  (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 (obj-file-name name)
+    (let ((idx (last-index-of (string->list name) #\. 0 -1)))
+      (if (= idx -1)
+          (string-append name ".so")
+          (string-append (substring name 0 idx) ".so"))))
+
+  (define (geiser:load-file filename)
+    (let ((output-filename (obj-file-name filename)))
+      (maybe-compile-file filename output-filename)
+      (load output-filename)))
+
+  (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)
+    rest
+    (sort string-ci<?
+          (filter (lambda (el)
+                    (string-prefix? prefix el))
+                  (map write-to-string (environment-symbols (interaction-environment))))))
+
+  (define (write-to-string x)
+    (with-output-to-string
+      (lambda ()
+        (write x))))
+
+  (define (geiser:eval module form . rest)
+    rest
+    (let ((output-string (open-output-string)))
+      (write
+       (call/cc
+        (lambda (k)
+          (with-exception-handler
+              (lambda (e)
+                (k `((result "")
+                     (output . ,(with-output-to-string
+                                  (lambda ()
+                                    (display-condition e))))
+                     (error (key . chez-error-message)))))
+            (lambda ()
+              (call-with-values
+                  ;; evaluate form, allow for multiple return values,
+                  ;; and capture output in output-string.
+                  (lambda ()
+                    (parameterize ((current-output-port output-string))
+                      (if module
+                          (eval form (environment module))
+                          (eval form))))
+                (lambda result
+                  `((result ,(with-output-to-string
+                               (lambda ()
+                                 (pretty-print
+                                  (if (null? (cdr result)) (car result) result)))))
+                    (output . ,(get-output-string output-string))))))))))
+      (newline)
+      (close-output-port output-string)))
+
+  (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 (procedure-parameter-list p)
+    ;; same as (inspect object), then hitting c
+    (let ((s (((inspect/object p) 'code) 'source)))
+      (if s
+          (let ((form (s 'value)))
+            (if (and (list? form)
+                     (> (length form) 2)
+                     (eq? (car form) 'lambda))
+                (cadr form)
+                #f))
+          #f)))
+
+  (define (operator-arglist operator)
+    (let ((binding (eval operator)))
+      (if binding
+          (let ((arglist (procedure-parameter-list binding)))
+            (let loop ((arglist arglist)
+                       (optionals? #f)
+                       (required '())
+                       (optional '()))
+              (cond ((null? arglist)
+                     `(,operator ("args" (("required" ,@(reverse required))
+                                          ("optional" ,@(reverse optional))
+                                          ("key")
+                                          ;; ("module" ,module)
+                                          ))))
+                    ((symbol? arglist)
+                     (loop '()
+                           #t
+                           required
+                           (cons "..." (cons arglist optional))))
+                    (else
+                     (loop
+                      (cdr arglist)
+                      optionals?
+                      (if optionals? required (cons (car arglist) required))
+                      (if optionals? (cons (car arglist) optional) optional))))))
+          '())))
+
+  (define (geiser:autodoc ids . rest)
+    (cond ((null? ids) '())
+          ((not (list? ids))
+           (geiser:autodoc (list ids)))
+          ((not (symbol? (car ids)))
+           (geiser:autodoc (cdr ids)))
+          (else
+           (map (lambda (id)
+                  (operator-arglist id))
+                ids))))
+
+  (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)))))))