;;; oni-eww.el --- Configuration for EWW             -*- lexical-binding: t; -*-

;; Copyright (C) 2021  Tom Willemse

;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: local
;; Version: 2021.0406.111733
;; Package-Requires: (eww oni-data-dir)

;; 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:

;; Configuration for ‘eww’, the Emacs Web Wowser.

;;; Code:

(require 'eww)

(defvar oni-eww-desired-window-width 120
  "The window width which ‘oni-eww-resize-margins’ will try to accommodate.")

(defun oni-eww-resize-margins ()
  "Set the margins of the current window so ‘window-width’ is as desired.
The desired window width is specified in ‘oni-eww-desired-window-width’."
  (let ((margin-size (/ (- (frame-width) 120) 2)))
    (set-window-margins nil margin-size margin-size)))

(defun oni-eww-setup-margins ()
  "Set up a hook for ‘oni-eww-resize-margins’ in the current buffer."
  (add-hook 'window-configuration-change-hook #'oni-eww-resize-margins nil t)
  (oni-eww-resize-margins))

(defun oni-eww-display-buffer-in-only-window (buffer alist)
  "Show only BUFFER.
Delete all other windows and then pass BUFFER and ALIST on to
`display-buffer-same-window'."
  (delete-other-windows)
  (display-buffer-same-window buffer alist))

(setq eww-bookmarks-directory (oni-data-dir-locate "eww/"))

(add-to-list 'display-buffer-alist
             `(,(rx string-start "*eww*" string-end) oni-eww-display-buffer-in-only-window))

(add-hook 'eww-mode-hook #'oni-eww-setup-margins)

(provide 'oni-eww)
;;; oni-eww.el ends here