lang/scheme: fix support for scheme implementations

Adds the following flags:

  +chez
  +chibi
  +chicken
  +gambit
  +gauche
  +guile
  +kawa
  +mit
  +racket

Fixes #4863

docs/modules.org

@@ -144,7 +144,7 @@ Modules that bring support for a language or group of languages to Emacs.
 + [[file:../modules/lang/ruby/README.org][ruby]] =+lsp +rvm +rbenv +rails +chruby=
 + [[file:../modules/lang/rust/README.org][rust]] =+lsp= - TODO
 + scala =+lsp= - TODO
-+ [[file:../modules/lang/scheme/README.org][scheme]] - TODO
++ [[file:../modules/lang/scheme/README.org][scheme]] =+chez +chibi +chicken +gambit +gauche +guile +kawa +mit +racket= - TODO
 + [[file:../modules/lang/sh/README.org][sh]] =+fish +lsp +powershell= - TODO
 + [[file:../modules/lang/sml/README.org][sml]] - TODO
 + [[file:../modules/lang/solidity/README.org][solidity]] - TODO

init.example.el

@@ -160,7 +160,7 @@
        ;;(ruby +rails)     ; 1.step {|i| p "Ruby is #{i.even? ? 'love' : 'life'}"}
        ;;rust              ; Fe2O3.unwrap().unwrap().unwrap().unwrap()
        ;;scala             ; java, but good
-       ;;scheme            ; a fully conniving family of lisps
+       ;;(scheme +guile)   ; a fully conniving family of lisps
        sh                ; she sells {ba,z,fi}sh shells on the C xor
        ;;sml
        ;;solidity          ; do you need a blockchain? No.

modules/lang/scheme/README.org

@@ -17,10 +17,29 @@ This module provides an environment for hacking and having fun in scheme. It is
 powered by [[https://www.nongnu.org/geiser/geiser_1.html#introduction][geiser]].
 
 ** Module Flags
-This module provides no flags.
++ =+chez=
++ =+chibi=
++ =+chicken=
++ =+gambit=
++ =+gauche=
++ =+guile=
++ =+kawa=
++ =+mit=
++ =+racket=
 
 ** Plugins
 + [[https://gitlab.com/jaor/geiser][geiser]]
++ [[https://github.com/nbfalcon/macrostep-geiser][macrostep-geiser]]
++ [[https://gitlab.com/emacs-geiser/chez][geiser-chez]] (if =+chez=)
++ [[https://gitlab.com/emacs-geiser/chez][geiser-chibi]] (if =+chibi=)
++ [[https://gitlab.com/emacs-geiser/chicken][geiser-chicken]] (if =+chicken=)
++ [[https://gitlab.com/emacs-geiser/gambit][geiser-gambit]] (if =+gambit=)
++ [[https://gitlab.com/emacs-geiser/gauche][geiser-gauche]] (if =+gauche=)
++ [[https://gitlab.com/emacs-geiser/guile][geiser-guile]] (if =+guile=)
++ [[https://github.com/flatwhatson/flycheck-guile][flycheck-guile]] (if =+guile= and =:checkers syntax=)
++ [[https://gitlab.com/emacs-geiser/kawa][geiser-kawa]] (if =+kawa=)
++ [[https://gitlab.com/emacs-geiser/mit][geiser-mit]] (if =+mit=)
++ [[https://gitlab.com/emacs-geiser/racket][geiser-racket]] (if =+racket=)
 
 * Prerequisites
 This module requires you to have at least one of the supported schemes, namely:

modules/lang/scheme/autoload.el

@@ -1,5 +1,20 @@
 ;;; lang/scheme/autoload.el -*- lexical-binding: t; -*-
 
+;; HACK geiser-* plugins will try to add to `geiser-active-implementations', so
+;;      it must be defined before their autoloads are evaluated. Fortunately,
+;;      Doom modules' autoloads run earlier than package autoloads.
+;;;###autoload
+(defvar geiser-active-implementations ())
+
+;; HACK `geiser-impl--add-to-alist' isn't autoloaded or inlined, so you get
+;;      void-function errors when it is called in the autoloads files of other
+;;      geiser-* packages.
+;;;###autoload
+(defun geiser-impl--add-to-alist (kind what impl &optional append)
+  (add-to-list 'geiser-implementations-alist
+               (list (list kind what) impl) append))
+
+
 (defvar calculate-lisp-indent-last-sexp)
 
 ;; Adapted from https://github.com/alezost/emacs-config/blob/master/utils/al-scheme.el#L76-L123

modules/lang/scheme/config.el

@@ -8,14 +8,10 @@
 (use-package! geiser
   :defer t
   :init
-  (setq geiser-active-implementations '(guile chicken mit chibi chez)
-        geiser-autodoc-identifier-format "%s → %s"
-        geiser-repl-current-project-function 'doom-project-root)
-  (if (featurep! :lang racket)
-      (setq auto-mode-alist
-            (remove '("\\.rkt\\'" . scheme-mode) auto-mode-alist))
-    (push 'racket geiser-active-implementations))
-  (after! scheme                        ; built-in
+  (setq geiser-autodoc-identifier-format "%s → %s"
+        geiser-repl-current-project-function #'doom-project-root)
+
+  (after! scheme  ; built-in
     (set-repl-handler! 'scheme-mode #'+scheme/open-repl)
     (set-eval-handler! 'scheme-mode #'geiser-eval-region)
     (set-lookup-handlers! '(scheme-mode geiser-repl-mode)
@@ -23,11 +19,10 @@
       :documentation #'geiser-doc-symbol-at-point))
   :config
   (set-popup-rules!
-    '(("^\\*geiser messages\\*$" :slot 1 :vslot -1)
-      ("^\\*Geiser dbg\\*$"      :slot 1 :vslot -1)
-      ("^\\*Geiser xref\\*$"     :slot 1 :vslot -1)
+    '(("^\\*[gG]eiser \\(dbg\\|xref\\|messages\\)\\*$" :slot 1 :vslot -1)
       ("^\\*Geiser documentation\\*$" :slot 2 :vslot 2 :select t :size 0.35)
       ("^\\* [A-Za-z0-9_-]+ REPL \\*" :size 0.3 :quit nil :ttl nil)))
+
   (map! :localleader
         :map scheme-mode-map
         "'"  #'geiser-mode-switch-to-repl
@@ -48,10 +43,6 @@
           "<" #'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
@@ -60,6 +51,19 @@
           "R" #'geiser-reload
           "c" #'geiser-repl-clear-buffer)))
 
+
+(use-package! macrostep-geiser
+  :hook (geiser-mode . macrostep-geiser-setup)
+  :hook (geiser-repl-mode . macrostep-geiser-setup)
+  :init
+  (map! :after geiser
+        :localleader
+        :map scheme-mode-map
+        :desc "Expand macro" "m" #'macrostep-geiser
+        :desc "Expand all macros recursively" "M" #'macrostep-geiser-all))
+
+
 (use-package! flycheck-guile
+  :when (featurep! +guile)
   :when (featurep! :checkers syntax)
   :after geiser)

modules/lang/scheme/packages.el

@@ -1,11 +1,27 @@
 ;; -*- no-byte-compile: t; -*-
 ;;; lang/scheme/packages.el
 
-(package! geiser
-  :recipe (:host gitlab :repo "emacs-geiser/geiser")
-  :pin "aa26163aa81b5af3bc5bbf23bec8b5776de3a8bc")
-
-(when (featurep! :checkers syntax)
-  (package! flycheck-guile
-    :recipe (:host github :repo "flatwhatson/flycheck-guile")
-    :pin "e46d6e5453dd7471309fae6549445c48e6d8f340"))
+(when (package! geiser :pin "aa26163aa81b5af3bc5bbf23bec8b5776de3a8bc")
+  (package! macrostep-geiser :pin "8600fca05fd12a2e0ffe63238ddbfcb37c285dac")
+  (when (featurep! +chez)
+    (package! geiser-chez :pin "4cb7f2667ea1c53da53f0144910fbbd67bccbf4d"))
+  (when (featurep! +chibi)
+    (package! geiser-chibi :pin "54e7f384618c73d8fb675b5289d443a8ee3e4dc8"))
+  (when (featurep! +chicken)
+    (package! geiser-chicken :pin "47be5b43b35d3bf35b0f668b4c08715ea41fb97d"))
+  (when (featurep! +gambit)
+    (package! geiser-gambit :pin "0ee4156640988497779345452c3aa0417356e606"))
+  (when (featurep! +gauche)
+    (package! geiser-gauche :pin "66e51430bded0f0e2037f474818a7bbaafb2906c"))
+  (when (featurep! +guile)
+    (package! geiser-guile :pin "93ef7101fdfcc7eac6f465b4b9788c384a323c14")
+    (when (featurep! :checkers syntax)
+      (package! flycheck-guile
+        :recipe (:host github :repo "flatwhatson/flycheck-guile")
+        :pin "e46d6e5453dd7471309fae6549445c48e6d8f340")))
+  (when (featurep! +kawa)
+    (package! geiser-kawa :pin "b96c008e9c3b8dc210d8b536ee7b76b8690c8af6"))
+  (when (featurep! +mit)
+    (package! geiser-mit :pin "d17394f577aaa2854a74a1a0039cb8f73378b400"))
+  (when (featurep! +racket)
+    (package! geiser-racket :pin "a87fd449cc6c7b0b17a0b08268e78d3f038f3351")))