Smart tab completion mode.

4 files changed, 60 insertions, 7 deletions

diff --git a/README b/README
index b489e37..26f917e 100644
--- a/README
+++ b/README
@@ -19,8 +19,6 @@
     |---------------+-------------------------------------------------|
     | M-.           | Edit symbol at point                            |
     | M-,           | Go back to where M-. was last invoked           |
-    | M-TAB         | Complete symbol at point                        |
-    | C-uM-TAB      | Complete module name at point                   |
     |---------------+-------------------------------------------------|
     | C-M-x, C-cC-e | Eval definition around point                    |
     | C-cMe         | Eval definition around point and switch to REPL |
@@ -35,6 +33,18 @@
     | C-cC-a        | Toggle autodoc mode                             |
     |---------------+-------------------------------------------------|
 
+       If `geiser-mode-smart-tab-p' is nil
+    |----------+-------------------------------|
+    | M-TAB    | Complete symbol at point      |
+    | C-uM-TAB | Complete module name at point |
+    |----------+-------------------------------|
+
+       If `geiser-mode-smart-tab-p' is t
+    |-------+-----------------------------------------|
+    | TAB   | Complete symbol at point or indent      |
+    | M-TAB | Complete module name at point or indent |
+    |-------+-----------------------------------------|
+
 *** In the REPL
 
     |--------------+-----------------------------------------|
diff --git a/elisp/geiser-completion.el b/elisp/geiser-completion.el
index 2f1aa36..814a587 100644
--- a/elisp/geiser-completion.el
+++ b/elisp/geiser-completion.el
@@ -215,6 +215,43 @@ With prefix, complete module name."
                       (geiser-completion--display-or-scroll completions
                                                             partial)))))))
 
+(defun geiser-completion--complete-module ()
+  (interactive)
+  (geiser-completion--complete-symbol t))
+
+
+;;; Smart tab mode:
+
+(make-variable-buffer-local
+ (defvar geiser-smart-tab-mode-string " SmartTab"
+   "Modeline indicator for geiser-smart-tab-mode"))
+
+(defun geiser-completion--maybe-complete ()
+  "Indent if at beginning of line or after a white space or
+closing parenthesis, try completion otherwise."
+  (interactive)
+  (let ((indent (or (bolp) (memq (syntax-class (syntax-after (1- (point))))
+                                 '(0 5)))))
+    (if indent (indent-according-to-mode) (geiser-completion--complete-symbol))))
+
+(define-minor-mode geiser-smart-tab-mode
+  "Toggle smart tab mode.
+With no argument, this command toggles the mode.
+Non-null prefix argument turns on the mode.
+Null prefix argument turns off the mode.
+
+When this mode is enable, TAB will indent if at point is at
+beginning of line or after a white space or closing parenthesis,
+and will try completing symbol at point otherwise. In addition,
+M-TAB will try module name completion."
+  :init-value nil
+  :lighter geiser-smart-tab-mode-string
+  :group 'geiser-mode
+  :keymap `((,(kbd "TAB") . geiser-completion--maybe-complete)
+            (,(kbd "M-TAB") . geiser-completion--complete-module)))
+
+
+
 
 (provide 'geiser-completion)
 ;;; geiser-completion.el ends here
diff --git a/elisp/geiser-mode.el b/elisp/geiser-mode.el
index d58de1e..84455e7 100644
--- a/elisp/geiser-mode.el
+++ b/elisp/geiser-mode.el
@@ -43,11 +43,16 @@
   :group 'geiser)
 
 (defcustom geiser-mode-autodoc-p t
-  "Whether `geiser-autodoc-mode' gets enabled by default in factor buffers."
+  "Whether `geiser-autodoc-mode' gets enabled by default in Scheme buffers."
   :group 'geiser-mode
   :group 'geiser-autodoc
   :type 'boolean)
 
+(defcustom geiser-mode-smart-tab-p t
+  "Whether `geiser-smart-tab-mode' gets enabled by default in Scheme buffers."
+  :group 'geiser-mode
+  :type 'boolean)
+
 
 
 ;;; Auxiliary functions:
@@ -132,10 +137,12 @@ interacting with the Geiser REPL is at your disposal.
 \\{geiser-mode-map}"
   :init-value nil
   :lighter geiser-mode-string
-  :group 'geiser
+  :group 'geiser-mode
   :keymap geiser-mode-map
   (setq geiser-autodoc-mode-string "/A")
-  (when geiser-mode-autodoc-p (geiser-autodoc-mode geiser-mode)))
+  (setq geiser-smart-tab-mode-string "/T")
+  (when geiser-mode-autodoc-p (geiser-autodoc-mode geiser-mode))
+  (when geiser-mode-smart-tab-p (geiser-smart-tab-mode geiser-mode)))
 
 
 ;;; Keys:
diff --git a/elisp/geiser-repl.el b/elisp/geiser-repl.el
index e9a0eb0..dbf277a 100644
--- a/elisp/geiser-repl.el
+++ b/elisp/geiser-repl.el
@@ -156,8 +156,7 @@ REPL buffer."
 (define-key geiser-repl-mode-map "\C-c\M-n" 'comint-next-input)
 
 (define-key geiser-repl-mode-map (kbd "TAB") 'geiser-completion--complete-symbol)
-(define-key geiser-repl-mode-map (kbd "M-TAB")
-  '(lambda () (interactive) (geiser-completion--complete-symbol t)))
+(define-key geiser-repl-mode-map (kbd "M-TAB") 'geiser-completion--complete-module)
 (define-key geiser-repl-mode-map "\M-." 'geiser-edit-symbol-at-point)
 (define-key geiser-repl-mode-map "\M-," 'geiser-edit-pop-edit-symbol-stack)