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+;; geiser-mit.el -- MIT/GNU 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-mit nil
+  "Customization for Geiser's MIT/GNU Scheme flavour."
+  :group 'geiser)
+
+(geiser-custom--defcustom geiser-mit-binary
+    "mit-scheme"
+  "Name to use to call the MIT/GNU Scheme executable when starting a REPL."
+  :type '(choice string (repeat string))
+  :group 'geiser-mit)
+
+(geiser-custom--defcustom geiser-mit-source-directory
+    ""
+  "The path to the MIT/GNU Scheme sources' src/ directory."
+  :type 'filename
+  :group 'geiser-mit)
+
+
+;;; REPL support:
+
+(defun geiser-mit--binary ()
+  (if (listp geiser-mit-binary)
+      (car geiser-mit-binary)
+    geiser-mit-binary))
+
+(defun geiser-mit--parameters ()
+  "Return a list with all parameters needed to start MIT/GNU Scheme.
+This function uses `geiser-mit-init-file' if it exists."
+  `("--load" ,(expand-file-name "mit/geiser/load.scm" geiser-scheme-dir))
+  )
+
+(defconst geiser-mit--prompt-regexp "[0-9]+ ([^)]+) => ") ;; *not* ]=>, that confuses syntax-ppss
+(defconst geiser-mit--debugger-prompt-regexp "[0-9]+ error> ")
+
+
+;;; Evaluation support:
+
+(defun geiser-mit--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-mit--module-re
+  ".*;; package: +\\(([^)]*)\\)")
+
+(defun geiser-mit--get-module (&optional module)
+  (cond ((null module)
+         (save-excursion
+           (geiser-syntax--pop-to-top)
+           (if (or (re-search-backward geiser-mit--module-re nil t)
+                   (re-search-forward geiser-mit--module-re nil t))
+               (geiser-mit--get-module (match-string-no-properties 1))
+             :f)))
+        ((listp module) module)
+        ((stringp module)
+         (condition-case nil
+             (car (geiser-syntax--read-from-string module))
+           (error :f)))
+        (t :f)))
+
+(defun geiser-mit--module-cmd (module fmt &optional def)
+  (when module
+    (let* ((module (geiser-mit--get-module module))
+           (module (cond ((or (null module) (eq module :f)) def)
+                         (t (format "%s" module)))))
+      (and module (format fmt module)))))
+
+(defun geiser-mit--enter-command (module)
+  (geiser-mit--module-cmd module "(geiser:ge '%s)" "()"))
+
+(defun geiser-mit--exit-command () "(%exit 0)")
+
+(defun geiser-mit--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))))
+
+;; 
+;; ;;; REPL startup
+
+(defconst geiser-mit-minimum-version "9.2.1")
+
+(defun geiser-mit--version (binary)
+  (shell-command-to-string
+   (format "%s --quiet --no-init-file --eval %s"
+           (shell-quote-argument binary)
+           "'(begin (display (get-subsystem-version-string \"Release\")) (%exit 0))'")))
+
+(defconst geiser-mit--path-rx "^In \\([^:\n ]+\\):\n")
+(defun geiser-mit--startup (remote)
+  (let ((geiser-log-verbose-p t))
+    (compilation-setup t)
+    (when (and (stringp geiser-mit-source-directory)
+               (not (string-empty-p geiser-mit-source-directory)))
+      (geiser-eval--send/wait (format "(geiser:set-mit-scheme-source-directory %S)" geiser-mit-source-directory)))))
+
+;;; Implementation definition:
+
+(define-geiser-implementation mit
+  (binary geiser-mit--binary)
+  (arglist geiser-mit--parameters)
+  (version-command geiser-mit--version)
+  (minimum-version geiser-mit-minimum-version)
+  (repl-startup geiser-mit--startup)
+  (prompt-regexp geiser-mit--prompt-regexp)
+  (debugger-prompt-regexp geiser-mit--debugger-prompt-regexp)
+  ;; (enter-debugger geiser-mit--enter-debugger)
+  (marshall-procedure geiser-mit--geiser-procedure)
+  (find-module geiser-mit--get-module)
+  (enter-command geiser-mit--enter-command)
+  (exit-command geiser-mit--exit-command)
+  ;; (import-command geiser-mit--import-command)
+  (find-symbol-begin geiser-mit--symbol-begin)
+  ;; (display-error geiser-mit--display-error)
+  ;; (external-help geiser-mit--manual-look-up)
+  ;; (check-buffer geiser-mit--guess)
+  ;; (keywords geiser-mit--keywords)
+  ;; (case-sensitive geiser-mit-case-sensitive-p)
+  )
+
+(geiser-impl--add-to-alist 'regexp "\\.scm$" 'mit t)
+(geiser-impl--add-to-alist 'regexp "\\.pkg$" 'mit t)
+
+(provide 'geiser-mit)