From fe2c79adce933b29e4bfcc6ca6f5c5e5546095a5 Mon Sep 17 00:00:00 2001
From: Peter <craven@gmx.net>
Date: Tue, 26 Apr 2016 07:19:36 +0200
Subject: Add preliminary support for MIT/GNU Scheme.

---
 scheme/mit/geiser/compile.scm |   9 ++
 scheme/mit/geiser/emacs.scm   | 252 ++++++++++++++++++++++++++++++++++++++++++
 scheme/mit/geiser/geiser.pkg  |  20 ++++
 scheme/mit/geiser/load.scm    |  11 ++
 4 files changed, 292 insertions(+)
 create mode 100644 scheme/mit/geiser/compile.scm
 create mode 100644 scheme/mit/geiser/emacs.scm
 create mode 100644 scheme/mit/geiser/geiser.pkg
 create mode 100644 scheme/mit/geiser/load.scm

(limited to 'scheme/mit/geiser')

diff --git a/scheme/mit/geiser/compile.scm b/scheme/mit/geiser/compile.scm
new file mode 100644
index 0000000..5817aa2
--- /dev/null
+++ b/scheme/mit/geiser/compile.scm
@@ -0,0 +1,9 @@
+(declare (usual-integrations))
+
+(load-option 'CREF)
+
+(with-working-directory-pathname
+    (directory-pathname (current-load-pathname))
+  (lambda ()
+    (cf "emacs")
+    (cref/generate-constructors "geiser" 'ALL)))
diff --git a/scheme/mit/geiser/emacs.scm b/scheme/mit/geiser/emacs.scm
new file mode 100644
index 0000000..d94c105
--- /dev/null
+++ b/scheme/mit/geiser/emacs.scm
@@ -0,0 +1,252 @@
+;;;; package: (runtime geiser)
+(declare (usual-integrations))
+
+(load-option 'format)
+
+(define (all-completions prefix environment)
+  (let (;; (prefix
+        ;;  (if (environment-lookup environment 'PARAM:PARSER-CANONICALIZE-SYMBOLS?)
+        ;;      (string-downcase prefix)
+        ;;      prefix))
+        (completions '()))
+    (for-each-interned-symbol
+     (lambda (symbol)
+       (if (and (string-prefix-ci? prefix (symbol-name symbol)) ; was string-prefix?, now defaults to case-insensitive (MIT/GNU Scheme's default)
+                (environment-bound? environment symbol))
+           (set! completions (cons (symbol-name symbol) completions)))
+       unspecific))
+    completions))
+
+(define (operator-arglist symbol env)
+  (let ((type (environment-reference-type env symbol)))
+    (let ((ans (if (eq? type 'normal)
+                   (let ((binding (environment-lookup env symbol)))
+                     (if (and binding
+                              (procedure? binding))
+                         (cons symbol (read-from-string (string-trim (with-output-to-string
+                                                                       (lambda () (pa binding))))))
+                         #f))
+                   #f ;; macros
+                   )))
+      ans)))
+
+(define (geiser:operator-arglist symbol env)
+  (let* ((arglist (operator-arglist symbol env))
+         (operator symbol))
+    (if arglist
+        (let loop ((arglist (cdr 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))))
+                ((eq? (car arglist) #!optional)
+                 (loop (cdr arglist)
+                       #t
+                       required
+                       optional))
+                (else
+                 (loop
+                  (cdr arglist)
+                  optionals?
+                  (if optionals? required (cons (car arglist) required))
+                  (if optionals? (cons (car arglist) optional) optional)))))
+        '())))
+
+
+(define (read-from-string str)
+  (with-input-from-string str
+    read))
+
+(define (all-packages)
+  (let loop ((package (name->package '()))) ;;  system-global-package
+    (cons package
+          (append-map loop (package/children package)))))
+
+(define anonymous-package-prefix
+  "environment-")
+
+(define (env->pstring env)
+  (let ((package (environment->package env)))
+    (if package
+        (write-to-string (package/name package))
+        (string anonymous-package-prefix (object-hash env)))))
+
+(define geiser-repl (nearest-repl))
+
+(define (set-geiser-repl-prompt! env)
+  (set-repl/prompt! geiser-repl (format #f "~s =>" (package/name (environment->package env))))
+  env)
+
+(define geiser-env #f)
+
+(define (get-symbol-definition-location object)
+  (let ((file (cond ((and (entity? object)
+                          (procedure? object))
+                     (receive (a b)
+                         (compiled-entry/filename-and-index (entity-procedure object))
+                       b
+                       a))
+                    ((compiled-procedure? object)
+                     (receive (a b)
+                         (compiled-entry/filename-and-index object)
+                       b
+                       a))
+                    (else
+                     '()))))
+    (fix-mit-source-dir
+     (if (and (string? file)
+              (string-suffix? ".inf" file))
+         (string-append (substring file 0 (- (string-length file) 3)) "scm")
+         file))))
+
+(define (fix-mit-source-dir filename)
+  (let ((default-location "/usr/lib/mit-scheme-x86-64/"))
+    (if (and geiser:mit-scheme-source-directory
+             (not (string-null? geiser:mit-scheme-source-directory)))
+        (if (string-prefix? default-location filename)
+            (string-append geiser:mit-scheme-source-directory (substring filename (string-length default-location) (string-length filename)))
+            filename)
+        filename)))
+
+(define geiser:mit-scheme-source-directory #f)
+
+;;;; ***************************************************************************
+
+(define (geiser:eval module form . rest)
+  rest
+  (let* ((output (open-output-string))
+         (environment (package/environment (find-package (if module module '(user)) #t)))
+         (result (with-output-to-port output
+                   (lambda ()
+                     (eval form environment)))))
+    (write `((result ,(write-to-string result)) (output . ,(get-output-string output))))))
+
+(define (geiser:autodoc ids . rest)
+  rest
+  (cond ((null? ids) '())
+        ((not (list? ids))
+         (geiser:autodoc (list ids)))
+        ((not (symbol? (car ids)))
+         (geiser:autodoc (cdr ids)))
+        (else
+         (let ((details (map (lambda (id) (geiser:operator-arglist id (->environment '(user)))) ids)))
+           details))))
+
+(define (geiser:module-completions prefix . rest)
+  rest
+  (filter (lambda (pstring)
+            (substring? prefix (write-to-string pstring)))
+          (map (lambda (package) (env->pstring (package/environment package))) (all-packages))))
+
+(define (geiser:completions prefix . rest)
+  rest
+  (sort (all-completions prefix (->environment '(user)))
+        string<?))
+
+(define (geiser:ge environment)
+  (let ((env (package/environment (find-package environment #t))))
+    (set-geiser-repl-prompt! env)
+    (set! geiser-env env))
+  (ge environment))
+
+(define (geiser:load-file filename)
+  (load filename))
+
+(define (geiser:module-exports module)
+  (let* ((pkg (find-package module #t))
+         (children (map package/name (package/children pkg)))
+         (env (package/environment pkg)))
+    (let loop ((vars '())
+               (procs '())
+               (syntax '())
+               (bindings (environment-bindings env)))
+      (if (null? bindings)
+          `(("vars" . ,vars) ("procs" . ,procs) ("syntax" . ,syntax) ("modules" . ,(map list children)))
+          (let* ((binding (car bindings))
+                 (name (car binding))
+                 (value (if (null? (cdr binding)) 'unassigned (cadr binding)))
+                 (ref-type (environment-reference-type env name)))
+            (cond ((eq? 'macro ref-type)
+                   (loop vars
+                         procs
+                         (cons `(,name ("signature")) syntax)
+                         (cdr bindings)))
+                  ((procedure? value)
+                   (loop vars
+                         (cons `(,name ("signature" . ,(geiser:operator-arglist name env))) procs)
+                         syntax
+                         (cdr bindings)))
+                  (else
+                   (loop (cons `(,name) vars)
+                         procs
+                         syntax
+                         (cdr bindings)))))))))
+
+(define (geiser:symbol-documentation symbol)
+  (if (environment-bound? geiser-env symbol)
+      (let ((ref-type (environment-reference-type geiser-env symbol))
+            (value (environment-safe-lookup geiser-env symbol)))
+        (case ref-type
+          ((macro)
+           `(("signature" ,symbol ("args"))
+             ("docstring" . "Macro")))
+          ((unassigned)
+           `(("signature" ,symbol ("args"))
+             ("docstring" . "Value: Unassigned~%")))
+          ((normal)
+           (if (procedure? value)
+               (let ((signature (geiser:operator-arglist symbol geiser-env)))
+                 `(("signature" . ,signature)
+                   ("docstring" . ,(format #f "Procedure:~%~a~%" (with-output-to-string (lambda () (pp value)))))))
+               `(("signature" ,symbol ("args"))
+                 ("docstring" . ,(format #f "Value:~%~a~%" (with-output-to-string (lambda () (pp value))))))
+               ))
+          (else
+           `(("signature" ,symbol ("args"))
+             ("docstring" . "Unknown thing...")))))
+      '()))
+
+(define (geiser:symbol-location symbol)
+  (if (environment-bound? geiser-env symbol)
+      (let ((ref-type (environment-reference-type geiser-env symbol))
+            (value (environment-safe-lookup geiser-env symbol)))
+        (if (eq? ref-type 'normal)
+            (let ((file (get-symbol-definition-location value)))
+              `(("name" . ,symbol)
+                ("file" . ,file)
+                ("line")))
+            '()))
+      `(("name" . ,symbol)
+        ("file")
+        ("line"))))
+
+(define (geiser:module-location symbol)
+  `(("name" . ,symbol)
+    ("file")
+    ("line")))
+
+
+(define (geiser:newline)
+  #f)
+
+(define (geiser:no-values)
+  #f)
+
+(define (geiser:set-mit-scheme-source-directory dir)
+  (set! geiser:mit-scheme-source-directory dir))
+
+(define (geiser:callers symbol)
+  symbol
+  #f)
+
+(define (geiser:callees symbol)
+  symbol
+  #f)
+
+(set-geiser-repl-prompt! (package/environment (find-package '(user))))
diff --git a/scheme/mit/geiser/geiser.pkg b/scheme/mit/geiser/geiser.pkg
new file mode 100644
index 0000000..7f67343
--- /dev/null
+++ b/scheme/mit/geiser/geiser.pkg
@@ -0,0 +1,20 @@
+;; -*-Scheme-*-
+(define-package (runtime geiser)
+  (files "emacs")
+  (parent ())
+  (export ()
+          geiser:eval
+          geiser:autodoc
+          geiser:module-completions
+          geiser:completions
+          geiser:ge
+          geiser:load-file
+          geiser:module-exports
+          geiser:symbol-documentation
+          geiser:symbol-location
+          geiser:module-location
+          geiser:callers
+          geiser:callees
+          geiser:set-mit-scheme-source-directory
+          geiser:newline
+          geiser:no-values))
diff --git a/scheme/mit/geiser/load.scm b/scheme/mit/geiser/load.scm
new file mode 100644
index 0000000..2dffd59
--- /dev/null
+++ b/scheme/mit/geiser/load.scm
@@ -0,0 +1,11 @@
+(declare (usual-integrations))
+
+(with-working-directory-pathname
+    (directory-pathname (current-load-pathname))
+  (lambda ()
+    (load "compile.scm")
+    (load-package-set "geiser"
+                      `())))
+
+(add-subsystem-identification! "Geiser" '(0 1))
+
-- 
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