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+;;; oni-elisp.el --- Emacs Lisp configuration        -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019  Tom Willemse
+
+;; Author: Tom Willemse <tom@ryuslash.org>
+;; Keywords: local
+;; Version: 2026.0527.003032
+;; Package-Requires: (oni-company oni-flycheck oni-paredit oni-hydra rainbow-delimiters nameless erefactor flycheck-relint elisp-format)
+
+;; 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:
+
+;; My configuration for working in Emacs Lisp.
+
+;;; Code:
+
+(require 'checkdoc)
+(require 'flycheck-relint)
+(require 'hydra)
+
+(let ((byte-compile-not-obsolete-funcs '(preceding-sexp)))
+  (require 'erefactor))
+
+(require 'ielm)
+
+(defconst oni-elisp-root
+  (file-name-directory
+   (or load-file-name
+       (buffer-file-name)))
+  "The directory where ‘oni-elisp’ was loaded from.")
+
+(font-lock-add-keywords
+ 'emacs-lisp-mode
+ `((,(rx symbol-start
+         (group (or "t"
+                    "nil"
+                    (and (optional "-")
+                         digit
+                         (minimal-match (zero-or-more (any digit ?.))))))
+         symbol-end)
+    1 font-lock-constant-face)))
+
+(defun oni-elisp-auto-fill-mode ()
+  "Enable ‘auto-fill-mode’ only for comments and inhibit for Package-Requires."
+  (setq-local comment-auto-fill-only-comments t)
+  (setq-local auto-fill-inhibit-regexp (rx line-start ";; Package-Requires: "))
+  (auto-fill-mode))
+
+(defun oni-elisp-setup-ielm-mode-line ()
+  "Clean up the mode-line for ielm buffers."
+  (setq mode-line-buffer-identification
+        (list (propertize "Interactive Emacs Lisp Mode" 'face 'mode-line-buffer-id))
+        mode-line-format
+        '("%e"
+          mode-line-front-space
+          mode-line-remote
+          mode-line-frame-identification
+          mode-line-buffer-identification
+          " on "
+          (:eval (buffer-name ielm-working-buffer))
+          mode-line-end-spaces)))
+
+(defun oni-elisp-ielm-remove-paredit-newline-keys ()
+  "Disable ‘C-j’ and ‘RET’ keybindings from ‘paredit-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)))
+
+(defhydra oni-elisp-hydra (:color teal :hint nil)
+  "
+^Eval^
+^^----------
+_eb_: Buffer
+"
+  ("eb" eval-buffer))
+
+(add-hook 'emacs-lisp-mode-hook #'oni-elisp-auto-fill-mode)
+(add-hook 'emacs-lisp-mode-hook 'company-mode)
+(add-hook 'emacs-lisp-mode-hook 'display-fill-column-indicator-mode)
+(add-hook 'emacs-lisp-mode-hook 'electric-quote-local-mode)
+(add-hook 'emacs-lisp-mode-hook 'erefactor-lazy-highlight-turn-on)
+(add-hook 'emacs-lisp-mode-hook 'flycheck-mode)
+(add-hook 'emacs-lisp-mode-hook 'nameless-mode)
+(add-hook 'emacs-lisp-mode-hook 'paredit-mode)
+(add-hook 'emacs-lisp-mode-hook 'rainbow-delimiters-mode)
+
+(add-hook 'ielm-mode-hook #'oni-elisp-ielm-remove-paredit-newline-keys)
+(add-hook 'ielm-mode-hook #'oni-elisp-setup-ielm-mode-line)
+(add-hook 'ielm-mode-hook 'company-mode)
+(add-hook 'ielm-mode-hook 'paredit-mode)
+
+(setq ielm-prompt "λ> ")
+
+(define-key emacs-lisp-mode-map (kbd "C-c r") erefactor-map)
+(define-key emacs-lisp-mode-map (kbd "C-c SPC") 'oni-elisp-hydra/body)
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("/Cask\\'" . emacs-lisp-mode))
+
+(add-to-list 'display-buffer-alist
+             '("\\`\\*ielm\\*\\'" display-buffer-in-side-window
+               (side . bottom)
+               (slot . 0)
+               (window-height . 0.33)))
+
+(flycheck-relint-setup)
+
+(add-hook 'emacs-lisp-mode-hook 'checkdoc-minor-mode)
+
+(setq checkdoc-spellcheck-documentation-flag t)
+
+(provide 'oni-elisp)
+;;; oni-elisp.el ends here