Add useful defaults and bindings to scheme mode (#2947)

* Add useful defaults and bindings to scheme mode

Scheme mode was pretty bare for a long time now and lacked many of
geiser's useful features like `geiser-smart-tab` and starting the geiser
repl on entering a file. This turns them on by default for the
productive schemer.

Besides that the following key bindings were remapped
+ `SPC m e e` -> `geiser-eval-last-sexp`
+ `SPC m e d` -> `geiser-eval-definition`
+ `SPC m e D` -> `geiser-eval-definition-and-go`

This brings the geiser keymaps in line with other lisp modes in doom.

Another change involves adding macro expand commands under `SPC m m` so
schemers can see what evil lurks beneath their commands.

Geiser autodoc commands have also been added under `SPC m h` for
schemers to read the docs, though they can still use `SPC c k` to do the
same thing.

* Remove package cookie

Its only necessary when not using (use-package!)

* Use setq instead of custom

* Add `defer t` back

* Add defer flag for scheme package

If a user went directly to a scheme file after load they would get an
error concerning rainbow-delimiters not being loaded. Deferring scheme
mode stops that error from happening

* Fix typo

Co-authored-by: Elais Player <elais@samus.hsd1.nm.comcast.net>

modules/lang/scheme/config.el

@@ -1,13 +1,16 @@
 ;;; lang/scheme/config.el -*- lexical-binding: t; -*-
 
-;;;###package scheme
+(use-package! scheme
-(add-hook 'scheme-mode-hook #'rainbow-delimiters-mode)
+  :defer t
-
+  :hook ((scheme-mode . rainbow-delimiters-mode)
+         (scheme-mode . geiser-mode)))
 
 (use-package! geiser
   :defer t
   :init
   (setq geiser-active-implementations '(guile chicken mit chibi chez))
+  (setq geiser-mode-start-repl-p t)
+  (setq geiser-smart-tab-p t)
   (unless (featurep! :lang racket)
     (push 'racket geiser-active-implementations))
   (after! scheme                        ; built-in
@@ -23,23 +26,33 @@
   (map! :localleader
         :map scheme-mode-map
         "'"  #'geiser-mode-switch-to-repl
+        "\"" #'geiser-connect
+        "["  #'geiser-squarify
+        "\\" #'geiser-insert-lambda
         "s"  #'geiser-set-scheme
 
         (:prefix ("e" . "eval")
           "b" #'geiser-eval-buffer
           "B" #'geiser-eval-buffer-and-go
-          "e" #'geiser-eval-definition
+          "e" #'geiser-eval-last-sexp
-          "E" #'geiser-eval-definition-and-go
+          "d" #'geiser-eval-definition
+          "D" #'geiser-eval-definition-and-go
           "r" #'geiser-eval-region
           "R" #'geiser-eval-region-and-go)
 
         (:prefix ("h" . "help")
-          "d" 'geiser-autodoc)
+          "d" #'geiser-autodoc
-        ;; TODO add more help keybindings
+          "<" #'geiser-xref-callers
-
+          ">" #'geiser-xref-callees
+          "i" #'geiser-doc-look-up-manual)
+        (:prefix ("m" . "macro")
+          "r" #'geiser-expand-region
+          "d" #'geiser-expand-definition
+          "e" #'geiser-expand-last-sexp)
         (:prefix ("r" . "repl")
           "b" #'geiser-switch-to-repl
           "q" #'geiser-repl-exit
+          "l" #'geiser-load-current-buffer
           "r" #'geiser-restart-repl
           "R" #'geiser-reload
           "c" #'geiser-repl-clear-buffer)))