From 2a7a3f6ee98e88d223a4e5df121791fa3205ec27 Mon Sep 17 00:00:00 2001
From: Peter <craven@gmx.net>
Date: Tue, 26 Apr 2016 22:27:26 +0200
Subject: Add preliminary support for Chez Scheme

---
 elisp/geiser-chez.el         | 157 +++++++++++++++++++++++++++++++++++++++++++
 scheme/chez/geiser/geiser.ss |  62 +++++++++++++++++
 2 files changed, 219 insertions(+)
 create mode 100644 elisp/geiser-chez.el
 create mode 100644 scheme/chez/geiser/geiser.ss

diff --git a/elisp/geiser-chez.el b/elisp/geiser-chez.el
new file mode 100644
index 0000000..f75ba2d
--- /dev/null
+++ b/elisp/geiser-chez.el
@@ -0,0 +1,157 @@
+;; geiser-chez.el -- Chez Scheme's implementation of the geiser protocols
+
+;; 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>.
+
+(require 'geiser-connection)
+(require 'geiser-syntax)
+(require 'geiser-custom)
+(require 'geiser-base)
+(require 'geiser-eval)
+(require 'geiser-edit)
+(require 'geiser-log)
+(require 'geiser)
+
+(require 'compile)
+(require 'info-look)
+
+(eval-when-compile (require 'cl))
+
+
+;;; Customization:
+
+(defgroup geiser-chez nil
+  "Customization for Geiser's Chez Scheme flavour."
+  :group 'geiser)
+
+(geiser-custom--defcustom geiser-chez-binary
+    "chez-scheme"
+  "Name to use to call the Chez Scheme executable when starting a REPL."
+  :type '(choice string (repeat string))
+  :group 'geiser-chez)
+
+
+;;; REPL support:
+
+(defun geiser-chez--binary ()
+  (if (listp geiser-chez-binary)
+      (car geiser-chez-binary)
+    geiser-chez-binary))
+
+(defun geiser-chez--parameters ()
+  "Return a list with all parameters needed to start Chez Scheme.
+This function uses `geiser-chez-init-file' if it exists."
+;;  `("--load" ,(expand-file-name "chez/geiser/load.scm" geiser-scheme-dir))
+  `(,(expand-file-name "chez/geiser/geiser.ss" geiser-scheme-dir))
+  )
+
+(defconst geiser-chez--prompt-regexp "> ")
+
+
+;;; Evaluation support:
+
+(defun geiser-chez--geiser-procedure (proc &rest args)
+  (case proc
+    ((eval compile)
+     (let ((form (mapconcat 'identity (cdr args) " "))
+           (module (cond ((string-equal "'()" (car args))
+                          "'()")
+                         ((and (car args))
+                             (concat "'" (car args)))
+                         (t
+                          "#f"))))
+       (format "(geiser:eval %s '%s)" module form)))
+    ((load-file compile-file)
+     (format "(geiser:load-file %s)" (car args)))
+    ((no-values)
+     "(geiser:no-values)")
+    (t
+     (let ((form (mapconcat 'identity args " ")))
+       (format "(geiser:%s %s)" proc form)))))
+
+;; (defconst geiser-chez--module-re
+;;   ".*;; package: +\\(([^)]*)\\)")
+
+(defun geiser-chez--get-module (&optional module)
+  (cond ((null module)
+         :f)
+        ((listp module) module)
+        ((stringp module)
+         (condition-case nil
+             (car (geiser-syntax--read-from-string module))
+           (error :f)))
+        (t :f)))
+
+;; (defun geiser-chez--module-cmd (module fmt &optional def)
+;;   (when module
+;;     (let* ((module (geiser-chez--get-module module))
+;;            (module (cond ((or (null module) (eq module :f)) def)
+;;                          (t (format "%s" module)))))
+;;       (and module (format fmt module)))))
+
+;; (defun geiser-chez--enter-command (module)
+;;   (geiser-chez--module-cmd module "(geiser:ge '%s)" "()"))
+
+(defun geiser-chez--symbol-begin (module)
+  (if module
+      (max (save-excursion (beginning-of-line) (point))
+           (save-excursion (skip-syntax-backward "^(>") (1- (point))))
+    (save-excursion (skip-syntax-backward "^'-()>") (point))))
+
+(defun geiser-chez--import-command (module)
+  (format "(import %s)" module))
+
+(defun geiser-chez--exit-command () "(exit 0)")
+;; 
+;; ;;; REPL startup
+
+(defconst geiser-chez-minimum-version "9.4")
+
+(defun geiser-chez--version (binary)
+  (shell-command-to-string
+   (format "%s --version"
+           (shell-quote-argument binary))))
+
+;; (defconst geiser-chez--path-rx "^In \\([^:\n ]+\\):\n")
+(defun geiser-chez--startup (remote)
+  (let ((geiser-log-verbose-p t))
+    (compilation-setup t)
+    ;; (when (and (stringp geiser-chez-source-directory)
+    ;;            (not (string-empty-p geiser-chez-source-directory)))
+    ;;   (geiser-eval--send/wait (format "(geiser:set-chez-scheme-source-directory %S)" geiser-chez-source-directory)))
+    (geiser-eval--send/wait "(begin (import (geiser)) (write `((result ) (output . \"\"))) (newline))")))
+
+;;; Implementation definition:
+
+(define-geiser-implementation chez
+  (binary geiser-chez--binary)
+  (arglist geiser-chez--parameters)
+  (version-command geiser-chez--version)
+  (minimum-version geiser-chez-minimum-version)
+  (repl-startup geiser-chez--startup)
+  (prompt-regexp geiser-chez--prompt-regexp)
+  (debugger-prompt-regexp nil) ;; geiser-chez--debugger-prompt-regexp
+  ;; (enter-debugger geiser-chez--enter-debugger)
+  (marshall-procedure geiser-chez--geiser-procedure)
+  (find-module geiser-chez--get-module)
+  ;; (enter-command geiser-chez--enter-command)
+  (exit-command geiser-chez--exit-command)
+  (import-command geiser-chez--import-command)
+  (find-symbol-begin geiser-chez--symbol-begin)
+  ;; (display-error geiser-chez--display-error)
+  ;; (external-help geiser-chez--manual-look-up)
+  ;; (check-buffer geiser-chez--guess)
+  ;; (keywords geiser-chez--keywords)
+  ;; (case-sensitive geiser-chez-case-sensitive-p)
+  )
+
+;; notes: (available-modules) in (chez modules)
+;; (env-exports (module-env (find-module '(scheme char)))), modules: (meta) (chez modules) (chez)
+
+(geiser-impl--add-to-alist 'regexp "\\.ss$" 'chez t)
+(geiser-impl--add-to-alist 'regexp "\\.def$" 'chez t)
+
+(provide 'geiser-chez)
+
diff --git a/scheme/chez/geiser/geiser.ss b/scheme/chez/geiser/geiser.ss
new file mode 100644
index 0000000..3dbed7f
--- /dev/null
+++ b/scheme/chez/geiser/geiser.ss
@@ -0,0 +1,62 @@
+(library (geiser)
+  (export geiser:eval
+          geiser:completions
+          geiser:module-completions
+          geiser:autodoc
+          geiser:no-values
+          geiser:newline)
+  (import (chezscheme))
+
+  (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 ((result (if module
+                      (eval form (environment module))
+                      (eval form))))
+      (write `((result ,(write-to-string result))
+               (output . "")))
+      (newline)))
+
+  (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 (geiser:autodoc ids . rest)
+    '())
+
+  (define (geiser:no-values)
+    #f)
+
+  (define (geiser:newline)
+    #f))
-- 
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