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+;;; 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>.
+
+
+;;; Code:
+
+(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-lib))
+
+
+;;; Customization:
+
+(defgroup geiser-chez nil
+  "Customization for Geiser's Chez Scheme flavour."
+  :group 'geiser)
+
+(geiser-custom--defcustom geiser-chez-binary
+    "scheme"
+  "Name to use to call the Chez Scheme executable when starting a REPL."
+  :type '(choice string (repeat string))
+  :group 'geiser-chez)
+
+(geiser-custom--defcustom geiser-chez-init-file "~/.chez-geiser"
+  "Initialization file with user code for the Chez REPL."
+  :type 'string
+  :group 'geiser-chez)
+
+(geiser-custom--defcustom geiser-chez-extra-command-line-parameters '()
+  "Additional parameters to supply to the Chez binary."
+  :type '(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."
+  (let ((init-file (and (stringp geiser-chez-init-file)
+                        (expand-file-name geiser-chez-init-file))))
+    `(,@(and init-file (file-readable-p init-file) (list init-file))
+      ,(expand-file-name "chez/geiser/geiser.ss" geiser-scheme-dir)
+      ,@geiser-chez-extra-command-line-parameters)))
+
+(defconst geiser-chez--prompt-regexp "> ")
+
+
+;;; Evaluation support:
+
+(defun geiser-chez--geiser-procedure (proc &rest args)
+  (cl-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)))))
+
+(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--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)
+  (car (process-lines binary "--version")))
+
+(defun geiser-chez--startup (remote)
+  (let ((geiser-log-verbose-p t))
+    (compilation-setup t)
+    (geiser-eval--send/wait "(begin (import (geiser)) (write `((result ) (output . \"\"))) (newline))")))
+
+(defun geiser-chez--display-error (module key msg)
+  (when (stringp msg)
+    (save-excursion (insert msg))
+    (geiser-edit--buttonize-files))
+  (and (or (eq key 'chez-error-message)
+           (not key))
+       (not (zerop (length msg)))
+       msg))
+
+;;; 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)
+  )
+
+(geiser-impl--add-to-alist 'regexp "\\.ss$" 'chez t)
+(geiser-impl--add-to-alist 'regexp "\\.def$" 'chez t)
+
+(provide 'geiser-chez)