;;; pgtk-theme.el --- GTK theme support for GNU Emacs. -*- lexical-binding: t -*-

;; Copyright (C) 2020 Free Software Foundation, Inc.

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; This package provides some crude GTK theme integration for GNU Emacs.

;;; Code:

(unless (and (or (string-prefix-p "3.98" gtk-version-string)
                 (string-prefix-p "4." gtk-version-string))
             (window-system))
  (error "Trying to load gtk-theme.el on an incompatible terminal"))

(require 'subr-x)

(deftheme gtk
  "The system GTK theme.")
(let ((class '((class color) (min-colors 89))))
  (custom-theme-set-faces
   'gtk
   `(default ((,class (:foreground
                       "gtk-style-foreground"
                       :background
                       "gtk-style-background"
                       :family
                       ,(pgtk-default-font-family t)))))
   `(variable-pitch ((,class (:family ,(pgtk-default-font-family nil)))))
   `(mode-line ((,class (:foreground
                         "gtk-style-modeline-foreground"
                         :background
                         "gtk-style-modeline-background"))))
   `(region ((,class (:foreground
                      "gtk_selection_fg_color"
                      :background
                      "gtk_selection_bg_color"))))
   `(link ((,class (:foreground "gtk-style-link-foreground"
                                :underline t))))
   `(custom-button ((,class (:foreground "gtk-style-foreground"
                                         :box (:line-width 5 :style gtk-released-button)))))
   `(eww-form-submit ((,class (:foreground "gtk-style-foreground"
                                           :box (:line-width 5 :style gtk-released-button)))))
   `(custom-button-mouse ((,class (:foreground "gtk-style-foreground"
                                               :box (:line-width 5 :style gtk-prelight-button)))))
   `(custom-button-pressed ((,class (:foreground "gtk-style-foreground"
                                                 :box (:line-width 5 :style gtk-pressed-button)))))
   `(widget-field ((,class (:foreground "gtk-style-foreground"
                                        :box (:line-width 5 :style gtk-selected-entry)))))
   `(widget-button ((,class (:foreground "gtk-style-foreground"
                                         :box (:line-width 5 :style gtk-released-button)))))
   `(link-visited ((,class (:foreground "gtk-style-slink-foreground"
                                        :underline t))))
   `(tab-bar ((,class (:foreground "gtk-style-modeline-foreground"
                                   :background "gtk-style-tb-background"))))
   `(org-checkbox ((,class (:foreground "gtk-style-foreground"
                                        :box (:line-width 5 :style gtk-unchecked-checkbox)))))))

(custom-theme-set-variables
 'gtk '(cursor-type `(bar . ,(pgtk-get-text-caret-width)))
 '(pgtk-flat-underwave-style t)
 '(window-divider-default-right-width (pgtk-get-separator-width))
 '(window-divider-default-bottom-width (pgtk-get-separator-width)))

;;;###autoload
(when (and (boundp 'custom-theme-load-path)
           load-file-name)
  ;; add theme folder to `custom-theme-load-path' when installing over MELPA
  (add-to-list 'custom-theme-load-path
               (file-name-as-directory (file-name-directory load-file-name))))

(provide-theme 'gtk)

;;; gtk-theme.el ends here
(provide 'gtk-theme)