From 533e4133307e9931838a2b6a50eb4c9474b81973 Mon Sep 17 00:00:00 2001
From: Jose Antonio Ortega Ruiz <jao@gnu.org>
Date: Sun, 3 May 2009 01:22:01 +0200
Subject: Wrapping arbitrary regions with a begin block before
 evaluation/expansion.

---
 elisp/geiser-debug.el | 28 ++++++++++++++++++----------
 elisp/geiser-mode.el  | 33 ++++++++++++++++++++++++---------
 2 files changed, 42 insertions(+), 19 deletions(-)

diff --git a/elisp/geiser-debug.el b/elisp/geiser-debug.el
index c8fb3f4..0573716 100644
--- a/elisp/geiser-debug.el
+++ b/elisp/geiser-debug.el
@@ -91,28 +91,36 @@
       (insert "In expression:\n"))
     (insert (format "%s%s\n" (make-string offset ?\ ) description))))
 
-(defun geiser-debug--send-region (compile start end and-go)
+(defsubst geiser-debug--wrap-region (str)
+  (format "(begin %s)" str))
+
+(defun geiser-debug--unwrap (str)
+  (if (string-match "(begin[ \t\n\v\r]+\\(.+\\)*)" str)
+      (match-string 1 str)
+    str))
+
+(defun geiser-debug--send-region (compile start end and-go wrap)
   (let* ((str (buffer-substring-no-properties start end))
-         (code `(,(if compile :comp :eval) (:scm ,str)))
+         (wrapped (if wrap (geiser-debug--wrap-region str) str))
+         (code `(,(if compile :comp :eval) (:scm ,wrapped)))
          (ret (geiser-eval--send/wait code))
          (err (geiser-eval--retort-error ret)))
-    (when and-go
-      (switch-to-geiser)
-      (push-mark)
-      (goto-char (point-max)))
+    (when and-go (funcall and-go))
     (when (not err) (message (format "=> %s" (geiser-eval--retort-result ret))))
     (geiser-debug--display-retort str ret)))
 
-(defun geiser-debug--expand-region (start end all)
+(defun geiser-debug--expand-region (start end all wrap)
   (let* ((str (buffer-substring-no-properties start end))
-         (code `(:eval ((:ge macroexpand) (quote (:scm ,str)) ,(if all :t :f))))
+         (wrapped (if wrap (geiser-debug--wrap-region str) str))
+         (code `(:eval ((:ge macroexpand) (quote (:scm ,wrapped)) ,(if all :t :f))))
          (ret (geiser-eval--send/wait code))
-         (err (geiser-eval--retort-error ret)))
+         (err (geiser-eval--retort-error ret))
+         (result (geiser-eval--retort-result ret)))
     (if err
         (geiser-debug--display-retort str ret)
       (geiser-debug--with-buffer
         (erase-buffer)
-        (insert (format "%s" (geiser-eval--retort-result ret)))
+        (insert (format "%s" (if wrap (geiser-debug--unwrap result) result)))
         (goto-char (point-min)))
       (geiser-debug--pop-to-buffer))))
 
diff --git a/elisp/geiser-mode.el b/elisp/geiser-mode.el
index d63d43a..045f5a9 100644
--- a/elisp/geiser-mode.el
+++ b/elisp/geiser-mode.el
@@ -61,12 +61,21 @@
 
 ;;; Evaluation commands:
 
-(defun geiser-eval-region (start end &optional and-go)
+(defun geiser--go-to-repl ()
+  (switch-to-geiser)
+  (push-mark)
+  (goto-char (point-max)))
+
+(defun geiser-eval-region (start end &optional and-go raw)
   "Eval the current region in the Geiser REPL.
 With prefix, goes to the REPL buffer afterwards (as
 `geiser-eval-region-and-go')"
   (interactive "rP")
-  (geiser-debug--send-region nil start end and-go))
+  (geiser-debug--send-region nil
+                             start
+                             end
+                             (and and-go 'geiser-go-to-repl)
+                             (not raw)))
 
 (defun geiser-eval-region-and-go (start end)
   "Eval the current region in the Geiser REPL and visit it afterwads."
@@ -82,7 +91,7 @@ With prefix, goes to the REPL buffer afterwards (as
     (end-of-defun)
     (let ((end (point)))
       (beginning-of-defun)
-      (geiser-eval-region (point) end and-go))))
+      (geiser-eval-region (point) end and-go t))))
 
 (defun geiser-eval-definition-and-go ()
   "Eval the current definition in the Geiser REPL and visit it afterwads."
@@ -92,7 +101,10 @@ With prefix, goes to the REPL buffer afterwards (as
 (defun geiser-eval-last-sexp ()
   "Eval the previous sexp in the Geiser REPL."
   (interactive)
-  (geiser-eval-region (save-excursion (backward-sexp) (point)) (point)))
+  (geiser-eval-region (save-excursion (backward-sexp) (point))
+                      (point)
+                      nil
+                      t))
 
 (defun geiser-compile-definition (&optional and-go)
   "Compile the current definition in the Geiser REPL.
@@ -103,18 +115,18 @@ With prefix, goes to the REPL buffer afterwards (as
     (end-of-defun)
     (let ((end (point)))
       (beginning-of-defun)
-      (geiser-debug--send-region t (point) end and-go))))
+      (geiser-debug--send-region t (point) end and-go t))))
 
 (defun geiser-compile-definition-and-go ()
   "Compile the current definition in the Geiser REPL and visit it afterwads."
   (interactive)
   (geiser-compile-definition t))
 
-(defun geiser-expand-region (start end &optional all)
+(defun geiser-expand-region (start end &optional all raw)
   "Macro-expand the current region and display it in a buffer.
 With prefix, recursively macro-expand the resulting expression."
   (interactive "rP")
-  (geiser-debug--expand-region start end all))
+  (geiser-debug--expand-region start end all (not raw)))
 
 (defun geiser-expand-definition (&optional all)
   "Macro-expand the current definition.
@@ -124,13 +136,16 @@ With prefix, recursively macro-expand the resulting expression."
     (end-of-defun)
     (let ((end (point)))
       (beginning-of-defun)
-      (geiser-expand-region (point) end all))))
+      (geiser-expand-region (point) end all t))))
 
 (defun geiser-expand-last-sexp (&optional all)
   "Macro-expand the previous sexp.
 With prefix, recursively macro-expand the resulting expression."
   (interactive "P")
-  (geiser-expand-region (save-excursion (backward-sexp) (point)) (point) all))
+  (geiser-expand-region (save-excursion (backward-sexp) (point))
+                        (point)
+                        all
+                        t))
 
 (defun geiser-set-scheme ()
   "Associates current buffer with a given Scheme implementation."
-- 
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