geiser-mode-auto-p: automatic geiser-mode is now optional

It hadn't occurred to me that anyone wouldn't want non-automatic
geiser-mode often enough to require its own customization variable.
Rotty proved me wrong. Or maybe not, but he deserves a custom var!

3 files changed, 15 insertions, 7 deletions

diff --git a/doc/parens.texi b/doc/parens.texi
index 78149e5..8068d51 100644
--- a/doc/parens.texi
+++ b/doc/parens.texi
@@ -58,12 +58,9 @@ Since @i{geiser-mode} is a minor mode, you can toggle it with
 @kbd{M-x geiser-mode}, and control its activation in hooks with the
 functions @code{turn-on-geiser-mode} and @code{turn-off-geiser-mode}.
 If, for some reason i cannot fathom, you prefer @i{geiser-mode} not
-to be active by default, the following elisp incantation will do the
-trick:
-@example
-(eval-after-load "geiser"
-  (remove-hook 'scheme-mode-hook 'turn-on-geiser-mode))
-@end example
+to be active by default, customizing @code{geiser-mode-auto-p} to
+@code{nil} will do the trick.
+
 @cindex scheme file extensions
 And if you happen to use a funky extension for your Scheme files that is
 not recognised as such by Emacs, just tell her about it with:
diff --git a/elisp/geiser-mode.el b/elisp/geiser-mode.el
index 719176d..8f8b7fe 100644
--- a/elisp/geiser-mode.el
+++ b/elisp/geiser-mode.el
@@ -34,6 +34,12 @@
   "Mode enabling Geiser abilities in Scheme buffers &co.."
   :group 'geiser)
 
+(geiser-custom--defcustom geiser-mode-auto-p t
+  "Whether `geiser-mode' should be active by default in all
+scheme buffers."
+  :group 'geiser-mode
+  :type 'boolean)
+
 (geiser-custom--defcustom geiser-mode-autodoc-p t
   "Whether `geiser-autodoc-mode' gets enabled by default in Scheme buffers."
   :group 'geiser-mode
@@ -250,6 +256,9 @@ interacting with the Geiser REPL is at your disposal.
   (interactive)
   (geiser-mode -1))
 
+(defun geiser-mode--maybe-activate ()
+  (when geiser-mode-auto-p (turn-on-geiser-mode)))
+
 
 ;;; Keys:
 
diff --git a/elisp/geiser.el b/elisp/geiser.el
index d40b6a8..d293423 100644
--- a/elisp/geiser.el
+++ b/elisp/geiser.el
@@ -67,6 +67,8 @@
 (autoload 'turn-off-geiser-mode "geiser-mode"
   "Disable Geiser's mode (useful in Scheme buffers)." t)
 
+(autoload 'geiser-mode--maybe-activate "geiser-mode")
+
 (mapc (lambda (group)
         (custom-add-load group (symbol-name group))
         (custom-add-load 'geiser (symbol-name group)))
@@ -85,7 +87,7 @@
 ;;; Setup:
 
 (eval-after-load "scheme"
-  '(add-hook 'scheme-mode-hook 'turn-on-geiser-mode))
+  '(add-hook 'scheme-mode-hook 'geiser-mode--maybe-activate))
 
 (add-to-list 'auto-mode-alist '("\\.rkt\\'" . scheme-mode))