Merge branch 'devel'

20 files changed, 857 insertions, 401 deletions

diff --git a/elisp/Makefile.am b/elisp/Makefile.am
new file mode 100644
index 0000000..9f93e64
--- /dev/null
+++ b/elisp/Makefile.am
@@ -0,0 +1,34 @@
+EXTRA_DIST = geiser-install.el.in
+
+dist_lisp_LISP = \
+   geiser-autodoc.el \
+   geiser-base.el \
+   geiser-company.el \
+   geiser-compile.el \
+   geiser-completion.el	\
+   geiser-connection.el	\
+   geiser-custom.el \
+   geiser-debug.el \
+   geiser-doc.el \
+   geiser-edit.el \
+   geiser.el \
+   geiser-eval.el \
+   geiser-guile.el \
+   geiser-impl.el \
+   geiser-log.el \
+   geiser-mode.el \
+   geiser-plt.el \
+   geiser-popup.el \
+   geiser-reload.el \
+   geiser-repl.el \
+   geiser-syntax.el \
+   geiser-xref.el \
+   geiser-version.el
+
+lisp_LISP = geiser-install.el
+
+CLEANFILES = geiser-install.el
+
+geiser-install.el: $(srcdir)/geiser.el $(srcdir)/geiser-install.el.in
+	@sed -e "s|@SCHEME_DIR[@]|$(datarootdir)/geiser|"  $(srcdir)/geiser-install.el.in >$@
+
diff --git a/elisp/geiser-autodoc.el b/elisp/geiser-autodoc.el
index f6d36a8..75f2e7c 100644
--- a/elisp/geiser-autodoc.el
+++ b/elisp/geiser-autodoc.el
@@ -46,14 +46,6 @@
   'font-lock-function-name-face
   geiser-autodoc "highlighting procedure name in autodoc messages")
 
-(geiser-custom--defface autodoc-optional-arg-marker
-  'font-lock-keyword-face
-  geiser-autodoc "highlighting #:opt marker in autodoc messages")
-
-(geiser-custom--defface autodoc-key-arg-marker
-  'font-lock-keyword-face
-  geiser-autodoc "highlighting #:key marker in autodoc messages")
-
 (defcustom geiser-autodoc-delay 0.3
   "Delay before autodoc messages are fetched and displayed, in seconds."
   :type 'number
@@ -74,79 +66,107 @@ when `geiser-autodoc-display-module-p' is on."
 ;;; Procedure arguments:
 
 (make-variable-buffer-local
- (defvar geiser-autodoc--last nil))
-
-(make-variable-buffer-local
- (defvar geiser-autodoc--last-result nil))
-
-(defun geiser-autodoc--function-args (form)
-  (if (equal (car geiser-autodoc--last) form) (cdr geiser-autodoc--last)
-    (when form
-      (let ((res (geiser-eval--send/result
-                  `(:eval ((:ge autodoc) (quote (:scm ,form))))
-                  500)))
-        (when (and res (listp res))
-          (unless (equalp res geiser-autodoc--last-result)
-            (setq geiser-autodoc--last-result res)
-            (setq geiser-autodoc--last
-                  (cons form
-                        (geiser-autodoc--str (cdr (assoc 'signature res))
-                                             (or (cdr (assoc 'position res)) 0)
-                                             (cdr (assoc 'module res))))))
-          (cdr geiser-autodoc--last))))))
-
-(defun geiser-autodoc--insert-arg (arg current pos)
-  (let ((p (point))
-        (str (format "%s" (if (eq arg '\#:rest) "." arg)))
-        (face (cond ((eq '\#:opt arg)
-                     'geiser-font-lock-autodoc-optional-arg-marker)
-                    ((eq '\#:key arg)
-                     'geiser-font-lock-autodoc-key-arg-marker)
-                    ((= current pos)
-                     'geiser-font-lock-autodoc-current-arg)
-                    (t nil))))
-    (insert str)
-    (when (listp arg)
-      (save-excursion
-        (replace-regexp "(quote \\(.*\\))" "'\\1" nil p (point))
-        (replace-string "nil" "()" t p (point))))
-    (when face (put-text-property p (point) 'face face))))
+ (defvar geiser-autodoc--cached-signatures nil))
+
+(defun geiser-autodoc--get-signatures (funs &optional keep-cached)
+  (when funs
+    (let ((fs (assq (car funs) geiser-autodoc--cached-signatures)))
+      (unless fs
+        (let ((missing) (cached))
+          (if (not geiser-autodoc--cached-signatures)
+              (setq missing funs)
+            (dolist (f funs)
+              (let ((cf (assq f geiser-autodoc--cached-signatures)))
+                (if cf (push cf cached)
+                  (push f missing)))))
+          (unless (or cached keep-cached)
+            (setq geiser-autodoc--cached-signatures nil))
+          (when missing
+            (let ((res (geiser-eval--send/result `(:eval ((:ge autodoc)
+                                                          (quote ,missing)))
+                                                 500)))
+              (when res
+                (setq geiser-autodoc--cached-signatures
+                      (append res (if keep-cached
+                                      geiser-autodoc--cached-signatures
+                                    cached))))))))
+      geiser-autodoc--cached-signatures)))
+
+(defun geiser-autodoc--insert-args (args current &optional pos)
+  (dolist (a args)
+    (let ((p (point)))
+      (insert (format "%s" a))
+      (when (or (and (numberp pos)
+                     (numberp current)
+                     (setq current (1+ current))
+                     (= (1+ pos) current))
+                (and (symbolp current)
+                     (listp a)
+                     (eq current (car a))))
+        (put-text-property p (point) 'face 'geiser-font-lock-autodoc-current-arg)
+        (setq pos nil current nil)))
+    (insert " "))
+  (when args (backward-char))
+  current)
 
 (defsubst geiser-autodoc--proc-name (proc module)
   (let ((str (if module
                  (format geiser-autodoc-procedure-name-format module proc)
                proc)))
-    (put-text-property 0 (length str)
-                       'face 'geiser-font-lock-autodoc-procedure-name
-                       str)
-    str))
-
-(defun geiser-autodoc--str (signature pos module)
-  (when (consp signature)
-    (let* ((proc (car signature))
-           (args (cdr signature))
-           (len (if (listp args) (length args) 0))
-           (current 1)
-           (pos (if (> pos len) len pos)))
-      (if (eq args 'variable)
-          (geiser-autodoc--proc-name proc module)
+    (propertize str 'face 'geiser-font-lock-autodoc-procedure-name)))
+
+(defun geiser-autodoc--str (desc signature)
+  (let ((proc (car desc))
+        (args (cdr (assoc 'args signature)))
+        (module (cdr (assoc 'module signature))))
+    (if (not args) (geiser-autodoc--proc-name proc module)
+      (let ((cpos 1)
+            (pos (or (cadr desc) 0))
+            (prev (caddr desc))
+            (reqs (cdr (assoc 'required args)))
+            (opts (cdr (assoc 'optional args)))
+            (keys (cdr (assoc 'key args))))
         (save-current-buffer
           (set-buffer (geiser-syntax--font-lock-buffer))
           (erase-buffer)
           (insert (format "(%s" (geiser-autodoc--proc-name proc module)))
-          (dolist (a args)
+          (when reqs
             (insert " ")
-            (geiser-autodoc--insert-arg a current pos)
-            (setq current (1+ current)))
+            (setq cpos
+                  (geiser-autodoc--insert-args reqs
+                                               cpos
+                                               (and (not (zerop pos)) pos))))
+          (when opts
+            (insert " [")
+            (setq cpos (geiser-autodoc--insert-args opts cpos pos))
+            (when keys
+              (insert " [")
+              (geiser-autodoc--insert-args keys prev nil)
+              (insert "]"))
+            (insert "]"))
           (insert ")")
           (buffer-string))))))
 
+(defun geiser-autodoc--autodoc (path &optional keep-cached)
+  (let ((signs (geiser-autodoc--get-signatures (mapcar 'car path) keep-cached))
+        (p (car path))
+        (s))
+    (while (and path (not s))
+      (unless (setq s (cdr (assq (car p) signs)))
+        (setq p (car path))
+        (setq path (cdr path))))
+    (when s (geiser-autodoc--str p s))))
+
 
 ;;; Autodoc function:
 
+(make-variable-buffer-local
+ (defvar geiser-autodoc--inhibit-flag nil))
+
 (defun geiser-autodoc--eldoc-function ()
   (condition-case e
-      (geiser-autodoc--function-args (geiser-syntax--get-partial-sexp))
+      (and (not geiser-autodoc--inhibit-flag)
+           (geiser-autodoc--autodoc (geiser-syntax--scan-sexps)))
     (error (format "Autodoc not available (%s)" (error-message-string e)))))
 
 
diff --git a/elisp/geiser-base.el b/elisp/geiser-base.el
index 362930d..fca955a 100644
--- a/elisp/geiser-base.el
+++ b/elisp/geiser-base.el
@@ -25,26 +25,10 @@
 
 ;;; Code:
 
-
-;;; Versioning:
-
-(defconst geiser-version-major 0
-  "Geiser's major version number.")
-(defconst geiser-version-minor 1
-  "Geiser's minor version number.")
-
-(defun geiser-version-string ()
-  "Geiser's version as a string."
-  (format "%s.%s" geiser-version-major geiser-version-minor))
-
-(defun geiser-version ()
-  "Echoes Geiser's version."
-  (interactive)
-  (message "Geiser %s" (geiser-version-string)))
-
-
 ;;; Emacs compatibility:
 
+(require 'cl)
+
 (eval-after-load "ring"
   '(when (not (fboundp 'ring-member))
      (defun ring-member (ring item)
@@ -55,7 +39,6 @@
 
 (when (not (fboundp 'completion-table-dynamic))
   (defun completion-table-dynamic (fun)
-    (require 'cl)
     (lexical-let ((fun fun))
       (lambda (string pred action)
         (with-current-buffer (let ((win (minibuffer-selected-window)))
diff --git a/elisp/geiser-company.el b/elisp/geiser-company.el
new file mode 100644
index 0000000..37c2196
--- /dev/null
+++ b/elisp/geiser-company.el
@@ -0,0 +1,121 @@
+;; geiser-company.el -- integration with company-mode
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Mon Aug 24, 2009 12:44
+
+;; This file is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This file is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'geiser-autodoc)
+(require 'geiser-completion)
+(require 'geiser-edit)
+(require 'geiser-base)
+
+
+;;; Helpers:
+
+(make-variable-buffer-local
+ (defvar geiser-company--enabled-flag nil))
+
+(make-variable-buffer-local
+ (defvar geiser-company--autodoc-flag nil))
+
+(defsubst geiser-company--candidates (prefix module)
+  (car (geiser-completion--complete prefix module)))
+
+(defsubst geiser-company--doc (id module)
+  (ignore-errors
+    (if module
+	(format "%s [module]" id)
+      (or (geiser-autodoc--autodoc (list (list (intern id) 0)) t)
+          (format "%s [local id]" id)))))
+
+(defsubst geiser-company--doc-buffer (id module)
+  nil)
+
+(defun geiser-company--location (id module)
+  (ignore-errors
+    (let ((id (intern id)))
+      (save-excursion
+        (if module
+            (geiser-edit-module id 'noselect)
+          (geiser-edit-symbol id 'noselect))))))
+
+(defun geiser-company--prefix-at-point (module)
+  (when geiser-company--enabled-flag
+    (cond ((nth 8 (syntax-ppss)) 'stop)
+          ((looking-at-p "\\_>") (geiser-completion--prefix module))
+          (module 'stop)
+          (t nil))))
+
+
+;;; Activation
+
+(defun geiser-company--setup (enable)
+  (setq geiser-company--enabled-flag enable)
+  (when (fboundp 'geiser-company--setup-company)
+    (geiser-company--setup-company enable)))
+
+(defun geiser-company--inhibit-autodoc (ignored)
+  (when (setq geiser-company--autodoc-flag geiser-autodoc-mode)
+    (geiser-autodoc-mode -1)))
+
+(defun geiser-company--restore-autodoc (&optional ignored)
+  (when geiser-company--autodoc-flag
+    (geiser-autodoc-mode 1)))
+
+
+;;; Backends:
+(defmacro geiser-company--make-backend (name mod)
+  `(defun ,name (command &optional arg &rest ignored)
+     "A `company-mode' completion back-end for `geiser-mode'."
+     (interactive (list 'interactive))
+     (case command
+       ('interactive (company-begin-backend ',name))
+       ('prefix (geiser-company--prefix-at-point ,mod))
+       ('candidates (geiser-company--candidates arg ,mod))
+       ('meta (geiser-company--doc arg ,mod))
+       ('doc-buffer (geiser-company--doc-buffer arg ,mod))
+       ('location (geiser-company--location arg ,mod))
+       ('sorted t))))
+
+(defvar geiser-company--backend '(company-geiser-ids company-geiser-modules))
+
+(eval-after-load "company"
+  '(progn
+     (defun geiser-company--setup-company (enable)
+       (set (make-local-variable 'company-default-lighter) "/C")
+       (set (make-local-variable 'company-echo-delay) 0.01)
+       (company-mode nil)
+       (when enable (company-mode enable)))
+     (geiser-company--make-backend company-geiser-ids nil)
+     (geiser-company--make-backend company-geiser-modules t)
+     (add-to-list 'company-backends geiser-company--backend)
+     (add-hook 'company-completion-finished-hook 'geiser-company--restore-autodoc)
+     (add-hook 'company-completion-cancelled-hook 'geiser-company--restore-autodoc)
+     (add-hook 'company-completion-started-hook 'geiser-company--inhibit-autodoc)))
+
+
+;;; Reload support:
+
+(defun geiser-company-unload-function ()
+  (when (boundp 'company-backends)
+    (setq company-backends (remove geiser-company--backend company-backends))))
+
+
+(provide 'geiser-company)
+;;; geiser-company.el ends here
diff --git a/elisp/geiser-completion.el b/elisp/geiser-completion.el
index 799280e..e3bd74b 100644
--- a/elisp/geiser-completion.el
+++ b/elisp/geiser-completion.el
@@ -29,7 +29,7 @@
 (require 'geiser-syntax)
 (require 'geiser-base)
 
-(eval-when-compile (require 'cl))
+(require 'cl)
 
 
 ;;; Completions window handling, heavily inspired in slime's:
@@ -84,7 +84,7 @@ terminates a current completion."
   (remove-hook 'pre-command-hook
                'geiser-completion--maybe-restore-window-cfg)
   (condition-case err
-      (cond ((find last-command-char "()\"'`,# \r\n:")
+      (cond ((find last-command-event "()\"'`,# \r\n:")
              (geiser-completion--restore-window-cfg))
             ((not (geiser-completion--window-active-p))
              (geiser-completion--forget-window-cfg))
@@ -146,11 +146,10 @@ terminates a current completion."
 
 ;;; Completion functionality:
 
-(defsubst geiser-completion--symbol-list (prefix)
+(defun geiser-completion--symbol-list (prefix)
   (delete-duplicates
-   (geiser-eval--send/result
-    `(:eval ((:ge completions) ,prefix
-             (quote (:scm ,(or (geiser-syntax--get-partial-sexp) "()"))))))
+   (append (mapcar (lambda (s) (format "%s" s)) (geiser-syntax--locals-around-point))
+           (geiser-eval--send/result `(:eval ((:ge completions) ,prefix))))
    :test 'string=))
 
 (defsubst geiser-completion--module-list (prefix)
@@ -205,14 +204,16 @@ terminates a current completion."
            (funcall geiser-completion--symbol-begin-function module))
       (save-excursion (skip-syntax-backward "^-()>") (point))))
 
+(defsubst geiser-completion--prefix (module)
+  (buffer-substring-no-properties (point)
+                                  (geiser-completion--symbol-begin module)))
+
 (defun geiser-completion--complete-symbol (&optional arg)
   "Complete the symbol at point.
 Perform completion similar to Emacs' complete-symbol.
 With prefix, complete module name."
   (interactive "P")
-  (let* ((end (point))
-         (beg (geiser-completion--symbol-begin arg))
-         (prefix (buffer-substring-no-properties beg end))
+  (let* ((prefix (geiser-completion--prefix arg))
          (result (geiser-completion--complete prefix arg))
          (completions (car result))
          (partial (cdr result)))
diff --git a/elisp/geiser-connection.el b/elisp/geiser-connection.el
index 33579f6..4f8592b 100644
--- a/elisp/geiser-connection.el
+++ b/elisp/geiser-connection.el
@@ -160,11 +160,15 @@
 
 (defun geiser-con--comint-buffer-form ()
   (with-current-buffer (geiser-con--comint-buffer)
-    (geiser-syntax--prepare-scheme-for-elisp-reader)
     (condition-case nil
-        (let ((form (read (current-buffer))))
-          (if (listp form) form (error)))
-      (error `((error (key . geiser-con-error) (msg . ,(buffer-string))))))))
+        (progn
+          (goto-char (point-min))
+          (re-search-forward "((\\(result\\|error\\)\\>")
+          (goto-char (match-beginning 0))
+          (let ((form (read (current-buffer))))
+            (if (listp form) form (error))))
+      (error `((error (key . geiser-con-error))
+               (output . ,(buffer-string)))))))
 
 (defun geiser-con--process-next (con)
   (when (not (geiser-con--connection-current-request con))
diff --git a/elisp/geiser-debug.el b/elisp/geiser-debug.el
index 7ebd0b5..6d795df 100644
--- a/elisp/geiser-debug.el
+++ b/elisp/geiser-debug.el
@@ -25,6 +25,7 @@
 
 ;;; Code:
 
+(require 'geiser-impl)
 (require 'geiser-eval)
 (require 'geiser-popup)
 (require 'geiser-base)
@@ -32,15 +33,23 @@
 
 ;;; Debug buffer mode:
 
-(defconst geiser-debug--error-alist
-  '(("^\\(In file +\\| +\\)\\([^ \n]+\\):\\([0-9]+\\):\\([0-9]+\\)" 2 3 4)
-    ("^Error.+$" nil nil nil 0)))
+(defvar geiser-debug-mode-map
+  (let ((map (make-sparse-keymap)))
+    (suppress-keymap map)
+    (set-keymap-parent map button-buffer-map)
+    map))
 
-(define-derived-mode geiser-debug-mode compilation-mode "Geiser Dbg"
+(defun geiser-debug-mode ()
   "A major mode for displaying Scheme compilation and evaluation results.
 \\{geiser-debug-mode-map}"
-  (set (make-local-variable 'compilation-error-regexp-alist)
-       geiser-debug--error-alist))
+  (interactive)
+  (kill-all-local-variables)
+  (buffer-disable-undo)
+  (use-local-map geiser-debug-mode-map)
+  (set-syntax-table scheme-mode-syntax-table)
+  (setq mode-name "Geiser DBG")
+  (setq major-mode 'geiser-debug-mode)
+  (setq buffer-read-only t))
 
 
 ;;; Buffer for displaying evaluation results:
@@ -50,42 +59,25 @@
 
 ;;; Displaying retorts
 
-(defun geiser-debug--display-retort (what ret)
+(defun geiser-debug--display-retort (what ret &optional res)
   (let* ((err (geiser-eval--retort-error ret))
+         (key (geiser-eval--error-key err))
          (output (geiser-eval--retort-output ret))
-         (stack (geiser-eval--retort-stack ret)))
+         (impl geiser-impl--implementation)
+         (module (geiser-eval--get-module)))
     (geiser-debug--with-buffer
       (erase-buffer)
       (insert what)
       (newline 2)
-      (when err (insert (geiser-eval--error-str err) "\n\n"))
-      (when output (insert output "\n\n"))
-      (when stack (geiser-debug--display-stack stack))
+      (when res
+        (insert res)
+        (newline 2))
+      (unless (geiser-impl--display-error impl module key output)
+        (when err (insert (geiser-eval--error-str err) "\n\n"))
+        (when output (insert output "\n\n")))
       (goto-char (point-min)))
     (when err (geiser-debug--pop-to-buffer))))
 
-(defsubst geiser-debug--frame-proc (frame) (cdr (assoc 'procedure frame)))
-(defsubst geiser-debug--frame-desc (frame) (cdr (assoc 'description frame)))
-(defsubst geiser-debug--frame-source (frame) (cdr (assoc 'source frame)))
-(defsubst geiser-debug--frame-source-file (src) (car src))
-(defsubst geiser-debug--frame-source-line (src) (or (cadr src) 1))
-(defsubst geiser-debug--frame-source-column (src) (or (caddr src) 0))
-
-(defun geiser-debug--display-stack (stack)
-  (mapc 'geiser-debug--display-stack-frame (reverse (cdr stack))))
-
-(defun geiser-debug--display-stack-frame (frame)
-  (let ((procedure (geiser-debug--frame-proc frame))
-        (source (geiser-debug--frame-source frame))
-        (description (geiser-debug--frame-desc frame)))
-    (if source
-        (insert (format "In file %s:%s:%s\n"
-                        (geiser-debug--frame-source-file source)
-                        (geiser-debug--frame-source-line source)
-                        (1+ (geiser-debug--frame-source-column source))))
-      (insert "In expression:\n"))
-    (insert (format "%s\n" description))))
-
 (defsubst geiser-debug--wrap-region (str)
   (format "(begin %s)" str))
 
@@ -99,10 +91,11 @@
          (wrapped (if wrap (geiser-debug--wrap-region str) str))
          (code `(,(if compile :comp :eval) (:scm ,wrapped)))
          (ret (geiser-eval--send/wait code))
+         (res (geiser-eval--retort-result-str ret))
          (err (geiser-eval--retort-error ret)))
     (when and-go (funcall and-go))
-    (when (not err) (message (format "=> %s" (geiser-eval--retort-result ret))))
-    (geiser-debug--display-retort str ret)))
+    (when (not err) (message "%s" res))
+    (geiser-debug--display-retort str ret res)))
 
 (defun geiser-debug--expand-region (start end all wrap)
   (let* ((str (buffer-substring-no-properties start end))
diff --git a/elisp/geiser-doc.el b/elisp/geiser-doc.el
index 8024239..29f0de2 100644
--- a/elisp/geiser-doc.el
+++ b/elisp/geiser-doc.el
@@ -24,7 +24,9 @@
 
 ;;; Code:
 
+(require 'geiser-impl)
 (require 'geiser-completion)
+(require 'geiser-autodoc)
 (require 'geiser-eval)
 (require 'geiser-syntax)
 (require 'geiser-popup)
@@ -157,32 +159,27 @@
 
 ;;; Commands:
 
-(make-variable-buffer-local
- (defvar geiser-doc--external-help-function nil))
-
-(defun geiser-doc--external-help (symbol module)
-  (and geiser-doc--external-help-function
-       (funcall geiser-doc--external-help-function symbol module)))
-
 (defun geiser-doc--get-docstring (symbol module)
-  (geiser-eval--send/result `(:eval ((:ge symbol-documentation) ',symbol) ,module)))
+  (geiser-eval--send/result
+   `(:eval ((:ge symbol-documentation) ',symbol) ,module)))
 
 (defun geiser-doc--get-module-exports (module)
   (geiser-eval--send/result `(:eval ((:ge module-exports) (:module ,module)))))
 
 (defun geiser-doc-symbol (symbol &optional module impl)
-  (let ((module (or module (geiser-eval--get-module))))
-    (unless (geiser-doc--external-help symbol module)
-      (let ((impl (or impl geiser-impl--implementation))
-            (ds (geiser-doc--get-docstring symbol module)))
+  (let ((module (or module (geiser-eval--get-module)))
+        (impl (or impl geiser-impl--implementation)))
+    (unless (geiser-impl--external-help impl symbol module)
+      (let ((ds (geiser-doc--get-docstring symbol module)))
         (if (or (not ds) (not (listp ds)))
             (message "No documentation available for '%s'" symbol)
           (geiser-doc--with-buffer
             (erase-buffer)
-            (geiser-doc--insert-title (cdr (assoc 'signature ds)))
+            (geiser-doc--insert-title (geiser-autodoc--str (list (format "%s" symbol) 0)
+                                                           (cdr (assoc 'signature ds))))
             (newline)
             (insert (or (cdr (assoc 'docstring ds)) ""))
-            (goto-line (point-min))
+            (goto-char (point-min))
             (setq geiser-doc--buffer-link
                   (geiser-doc--history-push
                    (geiser-doc--make-link symbol module impl))))
@@ -193,7 +190,8 @@
 With prefix argument, ask for symbol (with completion)."
   (interactive "P")
   (let ((symbol (or (and (not arg) (symbol-at-point))
-                    (geiser-completion--read-symbol "Symbol: " (symbol-at-point)))))
+                    (geiser-completion--read-symbol "Symbol: "
+                                                    (symbol-at-point)))))
     (when symbol (geiser-doc-symbol symbol))))
 
 
@@ -219,7 +217,8 @@ With prefix argument, ask for symbol (with completion)."
                                    impl))
         (goto-char (point-min))
         (setq geiser-doc--buffer-link
-              (geiser-doc--history-push (geiser-doc--make-link nil module impl))))
+              (geiser-doc--history-push
+               (geiser-doc--make-link nil module impl))))
       (geiser-doc--pop-to-buffer))))
 
 (defun geiser-doc-next (&optional forget-current)
diff --git a/elisp/geiser-edit.el b/elisp/geiser-edit.el
index 986099e..0ec1669 100644
--- a/elisp/geiser-edit.el
+++ b/elisp/geiser-edit.el
@@ -44,7 +44,11 @@
 
 (geiser-edit--define-custom-visit
  geiser-edit-symbol-method geiser-mode
- "How the new buffer is opened when invoking \\[geiser-edit-symbol-at-point].")
+ "How the new buffer is opened when invoking \\[geiser-edit-symbol-at-point]
+or following links in error buffers.")
+
+(geiser-custom--defface error-link
+  'link geiser-debug "links in error buffers")
 
 
 ;;; Auxiliar functions:
@@ -52,6 +56,7 @@
 (defun geiser-edit--visit-file (file method)
   (cond ((eq method 'window) (find-file-other-window file))
         ((eq method 'frame) (find-file-other-frame file))
+        ((eq method 'noselect) (find-file-noselect file t))
         (t (find-file file))))
 
 (defsubst geiser-edit--location-name (loc)
@@ -60,8 +65,18 @@
 (defsubst geiser-edit--location-file (loc)
   (cdr (assoc 'file loc)))
 
+(defsubst geiser-edit--to-number (x)
+  (cond ((numberp x) x)
+        ((stringp x) (string-to-number x))))
+
 (defsubst geiser-edit--location-line (loc)
-  (cdr (assoc 'line loc)))
+  (geiser-edit--to-number (cdr (assoc 'line loc))))
+
+(defsubst geiser-edit--location-column (loc)
+  (geiser-edit--to-number (cdr (assoc 'column loc))))
+
+(defsubst geiser-edit--make-location (name file line column)
+  `((name . ,name) (file . ,file) (line . ,line) (column . ,column)))
 
 (defconst geiser-edit--def-re
   (regexp-opt '("define"
@@ -92,8 +107,9 @@
   (format "\\_<%s\\_>" (regexp-quote (format "%s" thing))))
 
 (defun geiser-edit--goto-line (symbol line)
+  (goto-char (point-min))
   (if (numberp line)
-      (goto-line line)
+      (forward-line (max 0 (1- line)))
     (goto-char (point-min))
     (when (or (re-search-forward (geiser-edit--def-re symbol) nil t)
               (re-search-forward (geiser-edit--def-re* symbol) nil t)
@@ -103,26 +119,51 @@
 (defun geiser-edit--try-edit-location (symbol loc &optional method)
   (let ((symbol (or (geiser-edit--location-name loc) symbol))
         (file (geiser-edit--location-file loc))
-        (line (geiser-edit--location-line loc)))
+        (line (geiser-edit--location-line loc))
+        (col (geiser-edit--location-column loc)))
     (unless file (error "Couldn't find edit location for '%s'" symbol))
     (unless (file-readable-p file) (error "Couldn't open '%s' for read" file))
     (geiser-edit--visit-file file (or method geiser-edit-symbol-method))
-    (geiser-edit--goto-line symbol line)))
+    (geiser-edit--goto-line symbol line)
+    (when col
+      (beginning-of-line)
+      (forward-char col))
+    (cons (current-buffer) (point))))
 
-(defsubst geiser-edit--try-edit (symbol ret)
-  (geiser-edit--try-edit-location symbol (geiser-eval--retort-result ret)))
+(defsubst geiser-edit--try-edit (symbol ret &optional method)
+  (geiser-edit--try-edit-location symbol (geiser-eval--retort-result ret) method))
+
+
+;;; Links
+
+(define-button-type 'geiser-edit--button
+  'action 'geiser-edit--button-action
+  'face 'geiser-font-lock-error-link
+  'follow-link t)
+
+(defun geiser-edit--button-action (button)
+  (let ((loc (button-get button 'geiser-location)))
+    (when loc (geiser-edit--try-edit-location nil loc))))
+
+(defun geiser-edit--make-link (beg end file line col)
+  (make-button beg end
+               :type 'geiser-edit--button
+               'geiser-location
+               (geiser-edit--make-location 'error file line col)
+               'help-echo "Go to error location"))
 
 
 ;;; Commands:
 
-(defun geiser-edit-symbol ()
+(defvar geiser-edit--symbol-history nil)
+
+(defun geiser-edit-symbol (symbol &optional method)
   "Asks for a symbol to edit, with completion."
-  (interactive)
-  (let* ((symbol (geiser-completion--read-symbol "Edit symbol: "
-                                                nil
-                                                geiser-edit--symbol-history))
-         (cmd `(:eval ((:ge symbol-location) ',symbol))))
-    (geiser-edit--try-edit symbol (geiser-eval--send/wait cmd))))
+  (interactive (list (geiser-completion--read-symbol "Edit symbol: "
+                                                     nil
+                                                     geiser-edit--symbol-history)))
+  (let ((cmd `(:eval ((:ge symbol-location) ',symbol))))
+    (geiser-edit--try-edit symbol (geiser-eval--send/wait cmd) method)))
 
 (defun geiser-edit-symbol-at-point (&optional arg)
   "Opens a new window visiting the definition of the symbol at point.
@@ -142,11 +183,11 @@ With prefix, asks for the symbol to edit."
       (pop-tag-mark)
     (error "No previous location for find symbol invocation")))
 
-(defun geiser-edit-module (module)
+(defun geiser-edit-module (module &optional method)
   "Asks for a module and opens it in a new buffer."
   (interactive (list (geiser-completion--read-module)))
   (let ((cmd `(:eval ((:ge module-location) (:module ,module)))))
-    (geiser-edit--try-edit module (geiser-eval--send/wait cmd))))
+    (geiser-edit--try-edit module (geiser-eval--send/wait cmd) method)))
 
 
 (provide 'geiser-edit)
diff --git a/elisp/geiser-eval.el b/elisp/geiser-eval.el
index c493092..1c8cbfe 100644
--- a/elisp/geiser-eval.el
+++ b/elisp/geiser-eval.el
@@ -54,25 +54,6 @@ EVAL, COMPILE, LOAD-FILE and COMPILE-FILE should be supported."))
 
 ;;; Code formatting:
 
-(defun geiser-eval--scheme-str (code)
-  (cond ((null code) "'()")
-        ((eq code :f) "#f")
-        ((eq code :t) "#t")
-        ((listp code)
-         (cond ((eq (car code) :eval) (geiser-eval--eval (cdr code)))
-               ((eq (car code) :comp) (geiser-eval--comp (cdr code)))
-               ((eq (car code) :load-file)
-                (geiser-eval--load-file (cadr code)))
-               ((eq (car code) :comp-file)
-                (geiser-eval--comp-file (cadr code)))
-               ((eq (car code) :module) (geiser-eval--module (cadr code)))
-               ((eq (car code) :ge) (geiser-eval--ge (cadr code)))
-               ((eq (car code) :scm) (cadr code))
-               (t (concat "("
-                          (mapconcat 'geiser-eval--scheme-str code " ") ")"))))
-        ((symbolp code) (format "%s" code))
-        (t (format "%S" code))))
-
 (defsubst geiser-eval--eval (code)
   (geiser-eval--scheme-str
    `(,(geiser-eval--form 'eval) (quote ,(nth 0 code))
@@ -99,6 +80,25 @@ EVAL, COMPILE, LOAD-FILE and COMPILE-FILE should be supported."))
 (defsubst geiser-eval--ge (proc)
   (geiser-eval--scheme-str (geiser-eval--form proc)))
 
+(defun geiser-eval--scheme-str (code)
+  (cond ((null code) "'()")
+        ((eq code :f) "#f")
+        ((eq code :t) "#t")
+        ((listp code)
+         (cond ((eq (car code) :eval) (geiser-eval--eval (cdr code)))
+               ((eq (car code) :comp) (geiser-eval--comp (cdr code)))
+               ((eq (car code) :load-file)
+                (geiser-eval--load-file (cadr code)))
+               ((eq (car code) :comp-file)
+                (geiser-eval--comp-file (cadr code)))
+               ((eq (car code) :module) (geiser-eval--module (cadr code)))
+               ((eq (car code) :ge) (geiser-eval--ge (cadr code)))
+               ((eq (car code) :scm) (cadr code))
+               (t (concat "("
+                          (mapconcat 'geiser-eval--scheme-str code " ") ")"))))
+        ((symbolp code) (format "%s" code))
+        (t (format "%S" code))))
+
 
 ;;; Code sending:
 
@@ -145,11 +145,17 @@ EVAL, COMPILE, LOAD-FILE and COMPILE-FILE should be supported."))
 
 (defun geiser-eval--retort-result (ret)
   (let ((values (cdr (assoc 'result ret))))
-    (if (> (length values) 1) (cons :values values) (car values))))
+    (and (stringp (car values))
+         (ignore-errors (car (read-from-string (car values)))))))
+
+(defun geiser-eval--retort-result-str (ret)
+  (let ((values (cdr (assoc 'result ret))))
+    (if values
+        (concat "=> " (mapconcat 'identity values "\n=> "))
+      "(No value)")))
 
 (defsubst geiser-eval--retort-output (ret) (cdr (assoc 'output ret)))
 (defsubst geiser-eval--retort-error (ret) (cdr (assoc 'error ret)))
-(defsubst geiser-eval--retort-stack (ret) (cdr (assoc 'stack ret)))
 
 (defsubst geiser-eval--error-key (err) (cdr (assoc 'key err)))
 (defsubst geiser-eval--error-subr (err) (cdr (assoc 'subr err)))
@@ -160,7 +166,7 @@ EVAL, COMPILE, LOAD-FILE and COMPILE-FILE should be supported."))
   (let* ((key (geiser-eval--error-key err))
          (key-str (if key (format ": %s" key) ":"))
          (subr (geiser-eval--error-subr err))
-         (subr-str (if subr (format " (%s):" subr) ":"))
+         (subr-str (if subr (format " (%s):" subr) ""))
          (msg (geiser-eval--error-msg err))
          (msg-str (if msg (format "\n  %s" msg) ""))
          (rest (geiser-eval--error-rest err))
diff --git a/elisp/geiser-impl.el b/elisp/geiser-impl.el
index 6bc4e79..00fa1ef 100644
--- a/elisp/geiser-impl.el
+++ b/elisp/geiser-impl.el
@@ -27,7 +27,6 @@
 
 (require 'geiser-eval)
 (require 'geiser-base)
-(require 'geiser-doc)
 (require 'geiser-completion)
 
 
@@ -47,16 +46,63 @@
   :type '(repeat symbol)
   :group 'geiser-impl)
 
+(defcustom geiser-impl-implementations-alist nil
+  "A map from regular expressions or directories to implementations.
+When opening a new file, its full path will be matched against
+each one of the regular expressions or directories in this map in order to
+determine its scheme flavour."
+  :type '(repeat (list (choice (group :tag "Regular expression"
+                                      (const regexp) regexp)
+                               (group :tag "Directory"
+                                      (const dir) directory))
+                       symbol))
+  :group 'geiser-impl)
+
+
+;;; Auxiliary functions:
+(defsubst geiser-impl--sym (imp name)
+  (intern (format "geiser-%s-%s" imp name)))
+
+(defsubst geiser-impl--boundp (imp name)
+  (boundp (geiser-impl--sym imp name)))
+
+(defsubst geiser-impl--fboundp (imp name)
+  (fboundp (geiser-impl--sym imp name)))
+
+(defsubst geiser-impl--impl-feature (impl)
+  (intern (format "geiser-%s" impl)))
+
+(defun geiser-impl--value (imp name &optional fun)
+  (let ((sym (geiser-impl--sym imp name)))
+    (unless (or (and (not fun) (boundp sym))
+                (and fun (fboundp sym)))
+      (error "Unbound %s '%s' in Geiser Scheme implementation %s"
+             (if fun "function" "variable") sym imp))
+    (if fun (symbol-function sym) (symbol-value sym))))
+
+(defsubst geiser-impl--call-if-bound (imp name &rest args)
+  (when (geiser-impl--fboundp imp name)
+    (apply (geiser-impl--value imp name t) args)))
+
 
 ;;; Registering implementations:
 
 (defvar geiser-impl--impls nil)
 
+(make-variable-buffer-local
+ (defvar geiser-impl--implementation nil))
+
 (defun geiser-impl--register (impl)
-  (add-to-list 'geiser-impl--impls impl))
+  (when (and (not (memq impl geiser-impl--impls))
+             (require (geiser-impl--impl-feature impl) nil t))
+    (add-to-list 'geiser-impl--impls impl)))
 
 (defun geiser-impl--unregister (impl)
-  (setq geiser-impl--impls (remove impl geiser-impl--impls)))
+  (setq geiser-impl--impls (remove impl geiser-impl--impls))
+  (ignore-errors (unload-feature (geiser-impl--impl-feature impl))))
+
+(defun geiser-impl--add-to-alist (kind what impl)
+  (add-to-list 'geiser-impl-implementations-alist (list (list kind what) impl)))
 
 (defvar geiser-impl--default-implementation
   geiser-impl-default-implementation)
@@ -74,9 +120,6 @@
 
 ;;; Installing Scheme implementations:
 
-(make-variable-buffer-local
- (defvar geiser-impl--implementation nil))
-
 (defvar geiser-impl--impl-prompt-history nil)
 
 (defun geiser-impl--read-impl (&optional prompt impls non-req)
@@ -97,37 +140,12 @@
     (geiser-impl--install-vars impl)
     (geiser-impl--register impl)))
 
-(defsubst geiser-impl--sym (imp name)
-  (intern (format "geiser-%s-%s" imp name)))
-
-(defsubst geiser-impl--boundp (imp name)
-  (boundp (geiser-impl--sym imp name)))
-
-(defsubst geiser-impl--fboundp (imp name)
-  (fboundp (geiser-impl--sym imp name)))
-
-(defun geiser-impl--value (imp name &optional fun)
-  (let ((sym (geiser-impl--sym imp name)))
-    (unless (or (and (not fun) (boundp sym))
-                (and fun (fboundp sym)))
-      (error "Unbound %s '%s' in Geiser Scheme implementation %s"
-             (if fun "function" "variable") sym imp))
-    (if fun (symbol-function sym) (symbol-value sym))))
-
-(defsubst geiser-impl--call-if-bound (imp name &rest args)
-  (when (geiser-impl--fboundp imp name)
-    (apply (geiser-impl--value imp name t) args)))
-
 (defsubst geiser-impl--module-function (impl)
   (geiser-impl--sym impl "get-module"))
 
 (defsubst geiser-impl--geiser-procedure-function (impl)
   (geiser-impl--sym impl "geiser-procedure"))
 
-(defsubst geiser-impl--external-help-function (impl)
-  (let ((f (geiser-impl--sym impl "external-help")))
-    (and (fboundp f) f)))
-
 (defsubst geiser-impl--symbol-begin (impl)
   (geiser-impl--sym impl "symbol-begin"))
 
@@ -136,8 +154,6 @@
         (geiser-impl--module-function impl))
   (setq geiser-eval--geiser-procedure-function
         (geiser-impl--geiser-procedure-function impl))
-  (setq geiser-doc--external-help-function
-        (geiser-impl--external-help-function impl))
   (setq geiser-completion--symbol-begin-function
         (geiser-impl--symbol-begin impl)))
 
@@ -150,8 +166,6 @@
          (geiser-impl--module-function imp))
         (geiser-eval--geiser-procedure-function
          (geiser-impl--geiser-procedure-function imp))
-        (geiser-doc--external-help-function
-         (geiser-impl--external-help-function imp))
         (geiser-completion--symbol-begin-function
          (geiser-impl--symbol-begin imp)))
     (funcall thunk)))
@@ -171,7 +185,8 @@
   (geiser-impl--call-if-bound (geiser-impl--default-implementation)
                               "geiser-procedure"
                               proc))
-(set-default 'geiser-eval--geiser-procedure-function 'geiser-impl-geiser-procedure)
+(set-default 'geiser-eval--geiser-procedure-function
+             'geiser-impl-geiser-procedure)
 
 
 ;;; Access to implementation specific execution parameters:
@@ -191,6 +206,12 @@
 (defsubst geiser-impl--startup (impl)
   (geiser-impl--call-if-bound impl "startup"))
 
+(defsubst geiser-impl--external-help (impl symbol module)
+  (geiser-impl--call-if-bound impl "external-help" symbol module))
+
+(defsubst geiser-impl--display-error (impl module key msg)
+  (geiser-impl--call-if-bound impl "display-error" module key msg))
+
 
 ;;; Access to implementation guessing function:
 
@@ -199,22 +220,58 @@
    "Set this buffer local variable to specify the Scheme
 implementation to be used by Geiser."))
 
+(defun geiser-impl--match-impl (desc bn)
+  (let ((rx (if (eq (car desc) 'regexp)
+                (cadr desc)
+              (format "^%s" (regexp-quote (cadr desc))))))
+    (and rx (string-match-p rx bn))))
+
 (defun geiser-impl--guess ()
   (or geiser-impl--implementation
       geiser-scheme-implementation
       (catch 'impl
+        (let ((bn (buffer-file-name)))
+          (when bn
+            (dolist (x geiser-impl-implementations-alist)
+              (when (geiser-impl--match-impl (car x) bn)
+                (throw 'impl (cadr x))))))
         (dolist (impl geiser-impl--impls)
           (when (geiser-impl--call-if-bound impl "guess")
             (throw 'impl impl))))
       (geiser-impl--default-implementation)))
 
 
+;;; User commands
+
+(defun geiser-register-implementation ()
+  "Register a new Scheme implementation."
+  (interactive)
+  (let ((current geiser-impl-installed-implementations)
+        (impl (geiser-impl--read-impl "New Scheme implementation: " nil t)))
+    (unless (geiser-impl--register impl)
+      (error "geiser-%s.el not found in load-path" impl))
+    (when (and (not (memq impl current))
+               (y-or-n-p "Remember this implementation using customize? "))
+      (customize-save-variable
+       'geiser-impl-installed-implementations (cons impl current)))))
+
+(defun geiser-unregister-implementation ()
+  "Unregister an installed Scheme implementation."
+  (interactive)
+  (let* ((current geiser-impl-installed-implementations)
+         (impl (geiser-impl--read-impl "Forget implementation: " current)))
+    (geiser-impl--unregister impl)
+    (when (and impl
+               (y-or-n-p "Forget permanently using customize? "))
+      (customize-save-variable
+       'geiser-impl-installed-implementations (remove impl current)))))
+
+
 ;;; Unload support
 
 (defun geiser-impl-unload-function ()
   (dolist (imp (mapcar 'geiser-impl--impl-feature geiser-impl--impls))
-    (when (featurep imp) (unload-feature imp)))
-  t)
+    (when (featurep imp) (unload-feature imp t))))
 
 (defun geiser-impl--reload-implementations (impls)
   (dolist (impl impls)
@@ -223,8 +280,11 @@ implementation to be used by Geiser."))
 
 ;;; Initialization:
 
-(mapc 'geiser-impl--register geiser-impl-installed-implementations)
+(eval-after-load 'geiser-impl
+  '(mapc 'geiser-impl--register
+         (or geiser-impl-installed-implementations '(guile plt))))
 
 
 (provide 'geiser-impl)
+
 ;;; geiser-impl.el ends here
diff --git a/elisp/geiser-install.el.in b/elisp/geiser-install.el.in
new file mode 100644
index 0000000..da9f28f
--- /dev/null
+++ b/elisp/geiser-install.el.in
@@ -0,0 +1,5 @@
+(require 'geiser)
+
+(setq geiser-scheme-dir "@SCHEME_DIR@")
+
+(provide 'geiser-install)
diff --git a/elisp/geiser-log.el b/elisp/geiser-log.el
index 68e0fae..27a485a 100644
--- a/elisp/geiser-log.el
+++ b/elisp/geiser-log.el
@@ -28,6 +28,8 @@
 (require 'geiser-popup)
 (require 'geiser-base)
 
+(require 'comint)
+
 
 ;;; Customization:
 
diff --git a/elisp/geiser-mode.el b/elisp/geiser-mode.el
index e19cb68..fa686ec 100644
--- a/elisp/geiser-mode.el
+++ b/elisp/geiser-mode.el
@@ -28,6 +28,7 @@
 (require 'geiser-doc)
 (require 'geiser-compile)
 (require 'geiser-completion)
+(require 'geiser-company)
 (require 'geiser-xref)
 (require 'geiser-edit)
 (require 'geiser-autodoc)
@@ -52,6 +53,11 @@
   :group 'geiser-autodoc
   :type 'boolean)
 
+(defcustom geiser-mode-company-p t
+  "Whether to use company-mode for completion, if available."
+  :group 'geiser-mode
+  :type 'boolean)
+
 (defcustom geiser-mode-smart-tab-p nil
   "Whether `geiser-smart-tab-mode' gets enabled by default in Scheme buffers."
   :group 'geiser-mode
@@ -188,6 +194,7 @@ interacting with the Geiser REPL is at your disposal.
   (when geiser-mode (geiser-impl--set-buffer-implementation))
   (setq geiser-autodoc-mode-string "/A")
   (setq geiser-smart-tab-mode-string "/T")
+  (geiser-company--setup (and geiser-mode geiser-mode-company-p))
   (when geiser-mode-autodoc-p (geiser-autodoc-mode geiser-mode))
   (when geiser-mode-smart-tab-p (geiser-smart-tab-mode geiser-mode)))
 
@@ -261,6 +268,10 @@ interacting with the Geiser REPL is at your disposal.
       (geiser-mode 1)
       (when (cdr b) (geiser-impl--set-buffer-implementation (cdr b))))))
 
+(defun geiser-mode-unload-function ()
+  (dolist (b (geiser-mode--buffers))
+    (with-current-buffer (car b) (geiser-mode nil))))
+
 
 (provide 'geiser-mode)
 ;;; geiser-mode.el ends here
diff --git a/elisp/geiser-plt.el b/elisp/geiser-plt.el
index 44312b9..8810250 100644
--- a/elisp/geiser-plt.el
+++ b/elisp/geiser-plt.el
@@ -24,6 +24,8 @@
 
 ;;; Code:
 
+(require 'geiser-edit)
+(require 'geiser-doc)
 (require 'geiser-eval)
 (require 'geiser-syntax)
 (require 'geiser-custom)
@@ -109,7 +111,7 @@ This function uses `geiser-plt-init-file' if it exists."
       :f)))
 
 (defun geiser-plt-get-module (&optional module)
-  (cond ((and (null module) (geiser-plt--explicit-module)))
+  (cond ((and (null module) (buffer-file-name))) ;; (geiser-plt--explicit-module)
         ((null module) (geiser-plt--implicit-module))
         ((symbolp module) module)
         ((and (stringp module) (file-name-absolute-p module)) module)
@@ -121,13 +123,47 @@ This function uses `geiser-plt-init-file' if it exists."
 
 
 ;;; External help
+
 (defun geiser-plt-external-help (symbol module)
   (message "Requesting help for '%s'..." symbol)
-  (geiser-eval--send/wait `(:eval (get-help ',symbol (:module ,module)) geiser/autodoc))
+  (geiser-eval--send/wait
+   `(:eval (get-help ',symbol (:module ,module)) geiser/autodoc))
   (minibuffer-message "%s done" (current-message))
   t)
 
 
+;;; Error display
+
+(defconst geiser-plt--file-rxs '("^\\([^:\n\"]+\\):\\([0-9]+\\):\\([0-9]+\\)"
+                                 "path:\"?\\([^>\"\n]+\\)\"?>"
+                                 "module: \"\\([^>\"\n]+\\)\""))
+
+(defun geiser-plt--find-files (rx)
+  (save-excursion
+    (while (re-search-forward rx nil t)
+      (geiser-edit--make-link (match-beginning 1)
+                              (match-end 1)
+                              (match-string 1)
+                              (match-string 2)
+                              (match-string 3)))))
+
+(defun geiser-plt-display-error (module key msg)
+  (when key
+    (insert "Error: ")
+    (geiser-doc--insert-button key nil 'plt)
+    (newline 2))
+  (when msg
+    (let ((p (point)))
+      (insert msg)
+      (let ((end (point)))
+        (goto-char p)
+        (mapc 'geiser-plt--find-files geiser-plt--file-rxs)
+        (goto-char end)
+        (fill-region p end)
+        (newline))))
+  t)
+
+
 ;;; Trying to ascertain whether a buffer is mzscheme scheme:
 
 (defun geiser-plt-guess ()
@@ -135,7 +171,7 @@ This function uses `geiser-plt-init-file' if it exists."
         (goto-char (point-min))
         (re-search-forward "#lang " nil t))
       (geiser-plt--explicit-module)
-      (string-equal (file-name-extension (buffer-file-name)) "ss")))
+      (string-equal (file-name-extension (or (buffer-file-name) "")) "ss")))
 
 
 (provide 'geiser-plt)
diff --git a/elisp/geiser-reload.el b/elisp/geiser-reload.el
new file mode 100644
index 0000000..5a30e1f
--- /dev/null
+++ b/elisp/geiser-reload.el
@@ -0,0 +1,95 @@
+;; geiser-reload.el -- unload/load geiser packages
+
+;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
+;; Start date: Sat Aug 22, 2009 23:04
+
+;; This file is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This file is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'geiser-impl)
+(require 'geiser-repl)
+(require 'geiser-mode)
+(require 'geiser-base)
+(require 'geiser)
+
+
+;;; Reload:
+
+(defmacro geiser--features-list ()
+  (quote '(
+           geiser-mode
+           geiser-repl
+           geiser-xref
+           geiser-edit
+           geiser-doc
+           geiser-debug
+           geiser-impl
+           geiser-company
+           geiser-completion
+           geiser-autodoc
+           geiser-compile
+           geiser-eval
+           geiser-connection
+           geiser-syntax
+           geiser-log
+           geiser-custom
+           geiser-base
+           geiser-popup
+           geiser-install
+           geiser
+           geiser-version
+           )))
+
+(defun geiser-unload ()
+  "Unload all Geiser modules."
+  (interactive)
+  (let ((fs (geiser--features-list)))
+    (unload-feature 'geiser-reload t)
+    (dolist (f fs)
+      (when (featurep f) (unload-feature f t)))))
+
+(defun geiser-reload (&optional arg)
+  "Reload Geiser.
+With prefix arg, prompts for the DIRECTORY from which Geiser should be
+loaded again."
+  (interactive "P")
+  (let* ((old-dir geiser-elisp-dir)
+         (dir (or (and arg (read-directory-name "New Geiser elisp dir: "
+                                                old-dir old-dir t old-dir))
+                  old-dir)))
+    (unless (or (file-exists-p (expand-file-name "geiser-reload.el" dir))
+                (file-exists-p (expand-file-name "geiser-reload.elc" dir)))
+      (error "%s does not contain Geiser!" dir))
+    (let ((installed (featurep 'geiser-install))
+          (installed-impls geiser-impl-installed-implementations)
+          (impls geiser-impl--impls)
+          (repls (geiser-repl--repl-list))
+          (buffers (geiser-mode--buffers)))
+      (geiser-unload)
+      (setq load-path (remove old-dir load-path))
+      (add-to-list 'load-path dir)
+      (setq geiser-impl-installed-implementations installed-impls)
+      (require 'geiser-reload)
+      (when installed (require 'geiser-install nil t))
+      (geiser-impl--reload-implementations impls)
+      (geiser-repl--restore repls)
+      (geiser-mode--restore buffers)
+      (message "Geiser reloaded!"))))
+
+
+(provide 'geiser-reload)
+;;; geiser-reload.el ends here
diff --git a/elisp/geiser-repl.el b/elisp/geiser-repl.el
index f4d85dc..4ea1bb7 100644
--- a/elisp/geiser-repl.el
+++ b/elisp/geiser-repl.el
@@ -24,6 +24,7 @@
 
 ;;; Code:
 
+(require 'geiser-company)
 (require 'geiser-autodoc)
 (require 'geiser-edit)
 (require 'geiser-impl)
@@ -70,6 +71,11 @@ implementation name gets appended to it."
   :type 'boolean
   :group 'geiser-repl)
 
+(defcustom geiser-repl-company-p t
+  "Whether to use company-mode for completion, if available."
+  :group 'geiser-mode
+  :type 'boolean)
+
 (defcustom geiser-repl-read-only-prompt-p t
   "Whether the REPL's prompt should be read-only."
   :type 'boolean
@@ -141,8 +147,8 @@ implementation name gets appended to it."
     (geiser-repl--history-setup)
     (geiser-con--setup-connection (current-buffer) prompt-rx)
     (add-to-list 'geiser-repl--repls (current-buffer))
-    (geiser-impl--startup impl)
-    (geiser-repl--set-this-buffer-repl (current-buffer))))
+    (geiser-repl--set-this-buffer-repl (current-buffer))
+    (geiser-impl--startup impl)))
 
 (defun geiser-repl--process ()
   (let ((buffer (geiser-repl--get-repl geiser-impl--implementation)))
@@ -152,8 +158,10 @@ implementation name gets appended to it."
 (setq geiser-eval--default-proc-function 'geiser-repl--process)
 
 (defun geiser-repl--wait-for-prompt (timeout)
-  (let ((p (point)) (seen))
-    (while (and (not seen) (> timeout 0))
+  (let ((p (point)) (seen) (buffer (current-buffer)))
+    (while (and (not seen)
+                (> timeout 0)
+                (get-buffer-process buffer))
       (sleep-for 0.1)
       (setq timeout (- timeout 100))
       (goto-char p)
@@ -176,7 +184,8 @@ implementation name gets appended to it."
   (interactive
    (list (or (geiser-repl--only-impl-p)
              (and (eq major-mode 'geiser-repl-mode) geiser-impl--implementation)
-             (geiser-repl--read-impl "Start Geiser for scheme implementation: "))))
+             (geiser-repl--read-impl
+              "Start Geiser for scheme implementation: "))))
    (geiser-repl--start-repl impl))
 
 (defun switch-to-geiser (&optional ask impl)
@@ -254,7 +263,8 @@ If no REPL is running, execute `run-geiser' to start a fresh one."
   (set (make-local-variable 'comint-input-filter) 'geiser-repl--input-filter)
   (add-hook 'kill-buffer-hook 'geiser-repl--on-kill nil t)
   (comint-read-input-ring t)
-  (set-process-sentinel (get-buffer-process (current-buffer)) 'geiser-repl--sentinel))
+  (set-process-sentinel (get-buffer-process (current-buffer))
+                        'geiser-repl--sentinel))
 
 
 ;;; geiser-repl mode:
@@ -288,18 +298,22 @@ If no REPL is running, execute `run-geiser' to start a fresh one."
        'geiser-repl--beginning-of-defun)
   (set-syntax-table scheme-mode-syntax-table)
   (setq geiser-eval--get-module-function 'geiser-repl--module-function)
-  (when geiser-repl-autodoc-p (geiser-autodoc-mode 1)))
+  (when geiser-repl-autodoc-p (geiser-autodoc-mode 1))
+  (geiser-company--setup geiser-repl-company-p)
+  (compilation-shell-minor-mode 1))
 
 (define-key geiser-repl-mode-map "\C-d" 'delete-char)
 
-(define-key geiser-repl-mode-map "\C-cz" 'run-geiser)
-(define-key geiser-repl-mode-map "\C-c\C-z" 'run-geiser)
+(define-key geiser-repl-mode-map "\C-ck" 'geiser-repl-nuke)
+(define-key geiser-repl-mode-map "\C-c\C-k" 'geiser-repl-nuke)
+
+(define-key geiser-repl-mode-map "\C-cz" 'switch-to-geiser)
+(define-key geiser-repl-mode-map "\C-c\C-z" 'switch-to-geiser)
 (define-key geiser-repl-mode-map "\C-a" 'geiser-repl--bol)
 (define-key geiser-repl-mode-map (kbd "<home>") 'geiser-repl--bol)
 (define-key geiser-repl-mode-map "\C-ca" 'geiser-autodoc-mode)
 (define-key geiser-repl-mode-map "\C-cd" 'geiser-doc-symbol-at-point)
 (define-key geiser-repl-mode-map "\C-cm" 'geiser-repl--doc-module)
-(define-key geiser-repl-mode-map "\C-ck" 'geiser-compile-file)
 (define-key geiser-repl-mode-map "\C-cl" 'geiser-load-file)
 
 (define-key geiser-repl-mode-map "\M-p" 'comint-previous-matching-input-from-input)
@@ -326,7 +340,7 @@ If no REPL is running, execute `run-geiser' to start a fresh one."
 
 (defun geiser-repl--restore (impls)
   (dolist (impl impls)
-    (when impl (geiser impl))))
+    (when impl (geiser nil impl))))
 
 (defun geiser-repl-unload-function ()
   (dolist (repl geiser-repl--repls)
diff --git a/elisp/geiser-syntax.el b/elisp/geiser-syntax.el
index 14d996c..ca218c8 100644
--- a/elisp/geiser-syntax.el
+++ b/elisp/geiser-syntax.el
@@ -80,87 +80,183 @@
  (with-syntax 1))
 
 
+;;; A simple scheme reader
+
+(defvar geiser-syntax--read/buffer-limit nil)
+
+(defsubst geiser-syntax--read/eos ()
+  (or (eobp)
+      (and geiser-syntax--read/buffer-limit
+           (<= geiser-syntax--read/buffer-limit (point)))))
+
+(defsubst geiser-syntax--read/next-char ()
+  (unless (geiser-syntax--read/eos)
+    (forward-char)
+    (char-after)))
+
+(defsubst geiser-syntax--read/token (token)
+  (geiser-syntax--read/next-char)
+  (if (listp token) token (list token)))
+
+(defsubst geiser-syntax--read/elisp ()
+  (ignore-errors (read (current-buffer))))
+
+(defun geiser-syntax--read/matching (open close)
+  (let ((count 1)
+        (p (1+ (point))))
+    (while (and (> count 0)
+                (geiser-syntax--read/next-char))
+      (cond ((looking-at-p open) (setq count (1+ count)))
+            ((looking-at-p close) (setq count (1- count)))))
+    (buffer-substring-no-properties p (point))))
+
+(defsubst geiser-syntax--read/unprintable ()
+  (geiser-syntax--read/token
+   (cons 'unprintable (geiser-syntax--read/matching "<" ">"))))
+
+(defun geiser-syntax--read/skip-comment ()
+  (while (and (geiser-syntax--read/next-char)
+              (nth 8 (syntax-ppss))))
+  (geiser-syntax--read/next-token))
+
+(defun geiser-syntax--read/next-token ()
+  (skip-syntax-forward "->")
+  (if (geiser-syntax--read/eos) '(eob)
+    (case (char-after)
+      (?\; (geiser-syntax--read/skip-comment))
+      ((?\( ?\[) (geiser-syntax--read/token 'lparen))
+      ((?\) ?\]) (geiser-syntax--read/token 'rparen))
+      (?. (if (memq (syntax-after (1+ (point))) '(0 11 12))
+              (geiser-syntax--read/token 'dot)
+            (cons 'atom (geiser-syntax--read/elisp))))
+      (?\# (case (geiser-syntax--read/next-char)
+             ('nil '(eob))
+             (?| (geiser-syntax--read/skip-comment))
+             (?: (if (geiser-syntax--read/next-char)
+                     (cons 'kwd (geiser-syntax--read/elisp))
+                   '(eob)))
+             (?\\ (cons 'char (geiser-syntax--read/elisp)))
+             (?\( (geiser-syntax--read/token 'vectorb))
+             (?\< (geiser-syntax--read/unprintable))
+             (t (let ((tok (geiser-syntax--read/elisp)))
+                  (if tok (cons 'atom (intern (format "#%s" tok)))
+                    (geiser-syntax--read/next-token))))))
+      (?\' (geiser-syntax--read/token '(quote . quote)))
+      (?\` (geiser-syntax--read/token
+            `(backquote . ,backquote-backquote-symbol)))
+      (?, (if (eq (geiser-syntax--read/next-char) ?@)
+              (geiser-syntax--read/token
+               `(splice . ,backquote-splice-symbol))
+            `(unquote . ,backquote-unquote-symbol)))
+      (?\" (cons 'string (geiser-syntax--read/elisp)))
+      (t (cons 'atom (geiser-syntax--read/elisp))))))
+
+(defsubst geiser-syntax--read/match (&rest tks)
+  (let ((token (geiser-syntax--read/next-token)))
+    (if (memq (car token) tks) token
+      (error "Unexpected token: %s" token))))
+
+(defsubst geiser-syntax--read/try (&rest tks)
+  (let ((p (point))
+        (tk (ignore-errors (apply 'geiser-syntax--read/match tks))))
+    (unless tk (goto-char p))
+    tk))
+
+(defun geiser-syntax--read/list ()
+  (cond ((geiser-syntax--read/try 'dot)
+         (let ((tail (geiser-syntax--read)))
+           (geiser-syntax--read/match 'eob 'rparen)
+           tail))
+        ((geiser-syntax--read/try 'rparen 'eob) nil)
+        (t (cons (geiser-syntax--read)
+                 (geiser-syntax--read/list)))))
+
+(defun geiser-syntax--read ()
+  (let ((token (geiser-syntax--read/next-token)))
+    (case (car token)
+      (eob nil)
+      (lparen (geiser-syntax--read/list))
+      (vectorb (apply 'vector (geiser-syntax--read/list)))
+      ((quote backquote unquote splice) (list (cdr token)
+                                              (geiser-syntax--read)))
+      (kwd `(:keyword . ,(cdr token)))
+      (unprintable (format "#<%s>" (cdr token)))
+      ((char string atom) (cdr token))
+      (t (error "Reading scheme syntax: unexpected token: %s" token)))))
+
+(defsubst geiser-syntax--read/keyword-value (s)
+  (and (consp s) (eq (car s) :keyword) (cdr s)))
+
+(defsubst geiser-syntax--form-after-point (&optional boundary)
+  (let ((geiser-syntax--read/buffer-limit (and (numberp boundary) boundary)))
+    (save-excursion (values (geiser-syntax--read) (point)))))
+
+
 ;;; Code parsing:
 
-(geiser-popup--define syntax " *geiser syntax analyst*" scheme-mode)
+(defsubst geiser-syntax--skip-comment/string ()
+  (goto-char (or (nth 8 (syntax-ppss)) (point))))
 
-(defun geiser-syntax--prepare-scheme-for-elisp-reader ()
-  (let ((end (save-excursion
-               (goto-char (point-max))
-               (and (re-search-backward "(output \\. \"" nil t)
-                    (point)))))
-    (goto-char (point-min))
-    (while (re-search-forward "#\<\\([^>]*?\\)\>" end t)
-      (let ((from (match-beginning 1))
-            (to (match-end 1)))
-        (goto-char from)
-        (while (re-search-forward "\\([ ;'`]\\)" to t)
-          (replace-match "\\\\\\1"))
-        (goto-char from)
-        (while (re-search-forward "[()]" to t)
-          (replace-match ""))
-        (goto-char to)))
-    (goto-char (point-min))
-    (while (re-search-forward "#(" end t) (replace-match "(vector "))
-    (goto-char (point-min))
-    (while (re-search-forward "#" end t) (replace-match "\\\\#"))
-    (goto-char (point-min))
-    (skip-syntax-forward "^(")))
-
-(defsubst geiser-syntax--del-sexp (arg)
-  (let ((p (point)))
-    (forward-sexp arg)
-    (delete-region p (point))))
-
-(defconst geiser-syntax--placeholder (format "___%s___" (random 100)))
-
-(defsubst geiser-syntax--beginning-of-form ()
-  (memq (char-after (point)) '(?\" ?\()))
-
-(defun geiser-syntax--complete-partial-sexp (buffer begin end)
-  (geiser-syntax--with-buffer
-    (erase-buffer)
-    (insert-buffer-substring-no-properties buffer begin end)
-    (when (not (geiser-syntax--beginning-of-form))
-      (skip-syntax-backward "-<>")
-      (delete-region (point) (point-max)))
-    (let ((p (nth 8 (syntax-ppss))))
-      (when p ;; inside a comment or string
-        (delete-region p (point-max))
-        (insert geiser-syntax--placeholder)))
-    (when (cond ((eq (char-after (1- (point))) ?\))
-                 (geiser-syntax--del-sexp -1) t)
-                ((geiser-syntax--beginning-of-form)
-                 (delete-region (point) (point-max)) t)
-                ((memq (char-after (1- (point))) (list ?. ?@ ?, ?\' ?\` ?\# ?\\))
-                 (skip-syntax-backward "^-(")
-                 (delete-region (point) (point-max))
-                 t))
-      (insert geiser-syntax--placeholder))
+(defsubst geiser-syntax--nesting-level ()
+  (or (nth 0 (syntax-ppss)) 0))
+
+(defun geiser-syntax--scan-sexps ()
+  (save-excursion
+    (let* ((fst (symbol-at-point))
+           (path (and fst (list (list fst 0)))))
+      (while (not (zerop (geiser-syntax--nesting-level)))
+        (let ((boundary (1+ (point))))
+          (backward-up-list)
+          (let ((form
+                 (nth-value 0 (geiser-syntax--form-after-point boundary))))
+            (when (and (listp form) (car form) (symbolp (car form)))
+              (let* ((len-1 (1- (length form)))
+                     (prev (and (> len-1 1) (nth (1- len-1) form)))
+                     (prev (and prev
+                                (geiser-syntax--read/keyword-value prev))))
+                (push `(,(car form)
+                        ,len-1 ,@(and prev (symbolp prev) (list prev)))
+                      path))))))
+      (nreverse path))))
+
+(defun geiser-syntax--scan-locals (form partial locals)
+  (flet ((if-symbol (x) (and (symbolp x) x))
+         (if-list (x) (and (listp x) x))
+         (normalize (vars) (mapcar (lambda (i) (if (listp i) (car i) i)) vars)))
+    (cond ((or (null form) (not (listp form))) (normalize locals))
+          ((not (memq (car form) '(define let let* letrec lambda)))
+           (geiser-syntax--scan-locals (car (last form)) partial locals))
+          (t
+           (let* ((head (car form))
+                  (name (if-symbol (cadr form)))
+                  (names (if name (if-list (caddr form))
+                           (if-list (cadr form))))
+                  (rest (if name (cdddr form) (cddr form)))
+                  (use-names (or (eq head 'let*) (not partial) rest)))
+             (when name (push name locals))
+             (when use-names (dolist (n names) (push n locals)))
+             (dolist (f (butlast rest))
+               (when (eq (car f) 'define) (push (cadr f) locals)))
+             (geiser-syntax--scan-locals (car (last (or rest names)))
+                                         partial
+                                         locals))))))
+
+(defun geiser-syntax--locals-around-point ()
+  (when (eq major-mode 'scheme-mode)
     (save-excursion
-      (goto-char (point-min))
-      (while (re-search-forward "[.@,'`#\\\\]" nil t)
-        (replace-match "" nil nil))
-      (goto-char (point-min))
-      (while (re-search-forward "\\[" nil t)
-        (replace-match "(" nil nil))
-      (goto-char (point-min))
-      (while (re-search-forward "\\]" nil t)
-        (replace-match ")" nil nil)))
-    (let ((depth (nth 0 (parse-partial-sexp (point-min) (point)))))
-      (unless (zerop depth) (insert (make-string depth ?\)))))
-    (when (< (point-min) (point)) (buffer-substring (point-min) (point)))))
-
-(defsubst geiser-syntax--get-partial-sexp ()
-  (unless (zerop (nth 0 (syntax-ppss)))
-    (let* ((end (if (geiser-syntax--beginning-of-form) (1+ (point))
-                  (save-excursion (skip-syntax-forward "^-\"<>()") (point))))
-           (begin (save-excursion (beginning-of-defun) (point))))
-      (geiser-syntax--complete-partial-sexp (current-buffer) begin end))))
+      (geiser-syntax--skip-comment/string)
+      (let ((boundary (point)))
+        (while (not (zerop (geiser-syntax--nesting-level)))
+          (backward-up-list))
+        (multiple-value-bind (form end)
+            (geiser-syntax--form-after-point boundary)
+          (geiser-syntax--scan-locals form (> end boundary) '()))))))
 
 
 ;;; Fontify strings as Scheme code:
 
+(geiser-popup--define syntax " *geiser syntax analyst*" scheme-mode)
+
 (defun geiser-syntax--font-lock-buffer ()
   (let ((name " *geiser font lock*"))
     (or (get-buffer name)
diff --git a/elisp/geiser-version.el.in b/elisp/geiser-version.el.in
new file mode 100644
index 0000000..5b1258b
--- /dev/null
+++ b/elisp/geiser-version.el.in
@@ -0,0 +1,12 @@
+
+;;; Versioning:
+
+(defvar geiser-version-string "@PACKAGE_STRING@"
+  "Geiser's version as a string.")
+
+(defun geiser-version ()
+  "Echoes Geiser's version."
+  (interactive)
+  (message "%s" geiser-version-string))
+
+(provide 'geiser-version)
diff --git a/elisp/geiser.el b/elisp/geiser.el
index b12127c..64d4efb 100644
--- a/elisp/geiser.el
+++ b/elisp/geiser.el
@@ -27,9 +27,6 @@
 
 ;;; Locations:
 
-(defvar geiser-root-dir nil
-  "Geiser's root directory.")
-
 (defvar geiser-elisp-dir nil
   "Directory containing Geiser's Elisp files.")
 
@@ -37,14 +34,19 @@
   "Directory containing Geiser's Scheme files.")
 
 (setq geiser-elisp-dir (file-name-directory load-file-name))
-(setq geiser-scheme-dir (expand-file-name "../scheme/" geiser-elisp-dir))
-(setq geiser-root-dir (expand-file-name "../" geiser-elisp-dir))
-
 (add-to-list 'load-path geiser-elisp-dir)
 
+(setq geiser-scheme-dir (expand-file-name "../scheme/" geiser-elisp-dir))
+
 
 ;;; Autoloads:
 
+(autoload 'geiser-version "geiser-version.el" "Echo Geiser's version." t)
+
+(autoload 'geiser-unload "geiser-reload.el" "Unload all Geiser code." t)
+
+(autoload 'geiser-reload "geiser-reload.el" "Reload Geiser code." t)
+
 (autoload 'geiser "geiser-repl.el"
   "Start a Geiser REPL, or switch to a running one." t)
 
@@ -85,94 +87,15 @@
         geiser-faces
         geiser-mode
         geiser-guile
-        geiser-plt))
-
-
-;;; Scheme mode setup:
-
-(defun geiser-setup-scheme-mode ()
-  (eval-after-load "scheme"
-    '(add-hook 'scheme-mode-hook 'turn-on-geiser-mode)))
-
-(defun geiser-setup-implementations (impls)
-  (setq geiser-impl-installed-implementations (or impls '(guile plt))))
-
-(defsubst geiser-impl--impl-feature (impl)
-  (intern (format "geiser-%s" impl)))
-
-(defun geiser-setup (&rest impls)
-  (geiser-setup-implementations impls)
-  (geiser-setup-scheme-mode)
-  (mapc (lambda (impl)
-          (require (geiser-impl--impl-feature impl) nil t))
-        geiser-impl-installed-implementations))
-
-
-;;; Reload:
-
-(defmacro geiser--features-list ()
-  (quote '(
-           geiser-mode
-           geiser-repl
-           geiser-impl
-           geiser-doc
-           geiser-xref
-           geiser-edit
-           geiser-completion
-           geiser-autodoc
-           geiser-compile
-           geiser-debug
-           geiser-eval
-           geiser-connection
-           geiser-syntax
-           geiser-log
-           geiser-custom
-           geiser-base
-           geiser-popup
-           )))
-
-(defun geiser-unload-function ()
-  (dolist (feature (geiser--features-list))
-    (when (featurep feature) (unload-feature feature t)))
-  t)
-
-(defun geiser-unload ()
-  (interactive)
-  (when (featurep 'geiser) (unload-feature 'geiser)))
-
-(defun geiser-reload (&optional arg)
-  "Reload Geiser.
-With prefix arg, prompts for the DIRECTORY in which Geiser should be
-loaded."
-  (interactive "P")
-  (let* ((dir (or (and arg (read-directory-name "New Geiser root dir: "
-                                                geiser-root-dir
-                                                geiser-root-dir
-                                                t
-                                                geiser-root-dir))
-                  geiser-root-dir))
-         (geiser-main-file (expand-file-name "elisp/geiser.el" dir))
-         (impls (and (featurep 'geiser-impl) geiser-impl--impls))
-         (repls (and (featurep 'geiser-repl) (geiser-repl--repl-list)))
-         (buffers (and (featurep 'geiser-mode) (geiser-mode--buffers))))
-    (unless (file-exists-p geiser-main-file)
-      (error "%s does not contain Geiser!" dir))
-    (geiser-unload)
-    (setq load-path (remove geiser-elisp-dir load-path))
-    (load-file geiser-main-file)
-    (geiser-setup)
-    (dolist (feature (reverse (geiser--features-list)))
-      (load-library (format "%s" feature)))
-    (geiser-impl--reload-implementations impls)
-    (geiser-repl--restore repls)
-    (geiser-mode--restore buffers)
-    (message "Geiser reloaded!")))
+        geiser-plt
+        geiser-impl
+        geiser-xref))
 
 
-;; Initialization:
+;;; Setup:
 
-(geiser-setup)
+(eval-after-load "scheme"
+  '(add-hook 'scheme-mode-hook 'turn-on-geiser-mode))
 
 
 (provide 'geiser)
-;;; geiser.el ends here