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;;; oni-scheme.el --- Scheme configuration -*- lexical-binding: t; -*-
;; Copyright (C) 2019 Tom Willemse
;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: local
;; Version: 2026.0714.001225
;; Package-Requires: (oni-company oni-paredit rainbow-delimiters geiser geiser-guile)
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Scheme configuration.
;;; Code:
(require 'geiser)
(require 'geiser-impl)
(require 'geiser-repl)
(defvar oni-scheme-hidden-imports-keymap
(let ((keymap (make-sparse-keymap)))
(define-key keymap (kbd "TAB") 'oni-scheme-toggle-import-display)
keymap))
(defun oni-scheme--auto-fill-mode ()
"Enable ‘auto-fill-mode’ only for comments."
(setq-local comment-auto-fill-only-comments t)
(auto-fill-mode))
(defun oni-scheme-geiser-repl-remove-paredit-newline-keys ()
"Disable ‘C-j’ and ‘RET’ keybindings from ‘geiser-repl-mode’."
(let ((oldmap (map-elt minor-mode-map-alist 'paredit-mode))
(newmap (make-sparse-keymap)))
(set-keymap-parent newmap oldmap)
(define-key newmap (kbd "RET") nil)
(define-key newmap (kbd "C-j") nil)
(make-local-variable 'minor-mode-overriding-map-alist)
(push `(paredit-mode . ,newmap) minor-mode-overriding-map-alist)))
(defconst +oni-scheme-import-display+ " …"
"What to display instead of the scheme imports.")
(defun oni-scheme-toggle-import-display ()
(interactive)
(let* ((overlay (seq-find (lambda (o) (overlay-get o 'oni-scheme-hidden-imports))
(overlays-at (point))))
(visiblep (not (string= +oni-scheme-import-display+
(overlay-get overlay 'display)))))
(overlay-put overlay 'display (if visiblep +oni-scheme-import-display+ nil))))
(defun oni-scheme-hide-guile-imports ()
"Hide the imports in ‘define-module’."
(save-excursion
(let (start end)
(goto-char (point-min))
(when (re-search-forward (rx "(" (or "define-module"
"use-modules"))
nil t)
(forward-char (- (length (match-string 0))))
(setq start (line-end-position))
(forward-sexp)
(setq end (1- (point)))
(dolist (o (overlays-in start end))
(when (overlay-get o 'oni-scheme-hidden-imports)
(delete-overlay o)))
(let ((overlay (make-overlay start end)))
(overlay-put overlay 'oni-scheme-hidden-imports t)
(overlay-put overlay 'display +oni-scheme-import-display+)
(overlay-put overlay 'keymap oni-scheme-hidden-imports-keymap))))))
(add-hook 'scheme-mode-hook 'company-mode)
(add-hook 'scheme-mode-hook 'display-fill-column-indicator-mode)
(add-hook 'scheme-mode-hook 'oni-scheme--auto-fill-mode)
(add-hook 'scheme-mode-hook 'paredit-mode)
(add-hook 'scheme-mode-hook 'rainbow-delimiters-mode)
(add-hook 'scheme-mode-hook 'oni-scheme-hide-guile-imports)
(add-hook 'geiser-repl-mode-hook 'paredit-mode)
;;; Make sure this gets added _after_ ‘paredit-mode’ so that it gets executed
;;; later.
(add-hook 'geiser-repl-mode-hook #'oni-scheme-geiser-repl-remove-paredit-newline-keys 90)
(setq geiser-default-implementation 'guile)
(setq geiser-repl-history-filename
(expand-file-name "data/geiser-history" user-emacs-directory))
(put 'with-cwd 'scheme-indent-function 1)
(put 'with-env 'scheme-indent-function 1)
;;;###autoload
(add-to-list 'interpreter-mode-alist '("scsh" . scheme-mode))
(modify-syntax-entry ?| "_" scheme-mode-syntax-table)
(provide 'oni-scheme)
;;; oni-scheme.el ends here
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