17ee0e400b
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155 lines
5.4 KiB
EmacsLisp
155 lines
5.4 KiB
EmacsLisp
;;; cycle-themes.el --- A global minor mode to make switching themes easier
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;; Copyright (C) 2015 Katherine Whitlock
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;;
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;; Authors: Katherine Whitlock <toroidalcode@gmail.com>
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;; URL: http://github.com/toroidal-code/cycle-themes.el
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;; Package-Version: 20150402.2009
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;; Version: 1.0
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;; Package-Requires: ((cl-lib "0.5"))
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;; Keywords: Themes, Utility, Global Minor Mode
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;; This file is not part of GNU Emacs.
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;;; Commentary:
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;; Allows switching between themes easily.
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;;; Installation
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;; In your Emacs config, define a list of themes you want to be
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;; able to switch between. Then, enable the global minor mode.
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;;
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;; (setq cycle-themes-theme-list
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;; '(leuven monokai solarized-dark))
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;; (require 'cycle-themes)
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;; (cycle-themes-mode)
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;;
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;; `cycle-themes' is bound to 'C-c C-t' by default.
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;;
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;; You can optionally add hooks to be run after switching themes:
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;;
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;; (add-hook 'cycle-themes-after-cycle-hook
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;; #'(lambda () (Do-something-fn ...)))
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;;
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;;; License:
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;; This program is free software; you can redistribute it and/or modify it under
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;; the terms of the GNU General Public License as published by the Free Software
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;; Foundation; either version 3 of the License, or (at your option) any later
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;; version.
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;;
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;; This program is distributed in the hope that it will be useful, but WITHOUT
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;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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;; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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;; details.
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;;
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;; You should have received a copy of the GNU General Public License along with
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;; GNU Emacs; see the file COPYING. If not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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;; USA.
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;;; Code:
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(eval-when-compile
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(require 'cl-lib))
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(defgroup cycle-themes nil
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"The cycle-themes group"
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:group 'appearance
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:prefix "cycle-themes-")
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(defcustom cycle-themes-after-cycle-hook nil
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"Hooks that are run after switching themes."
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:group 'cycle-themes
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:type 'hook)
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(defcustom cycle-themes-theme-list (custom-available-themes)
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"The list of themes to cycle through on calling `cycle-themes'."
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:group 'cycle-themes
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:type '(list symbol))
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(defcustom cycle-themes-allow-multiple-themes nil
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"Whether to allow the application of more than one theme at once."
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:group 'cycle-themes
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:type 'boolean)
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(defconst cycle-themes-last-theme-set custom-enabled-themes
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"Used with multiple theme layering.")
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(defconst cycle-themes-first-start t
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"load-theme reapplies all minor-modes, so we need this to avoid a stack overflow.")
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(defun cycle-themes-get-next-valid-theme ()
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"Get the next valid theme from the list."
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;; save our starting theme for a infinite-loop check
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;; if there's no theme applied,
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(let* ((start-theme (or (first custom-enabled-themes)
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(car (last cycle-themes-theme-list))))
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(current-theme start-theme))
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;; do-while
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(while
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(progn
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;; Fancy way to move to the next theme
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;; with modular arithmetic so we never reach the end.
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(setq current-theme
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(nth (mod (1+ (cl-position current-theme cycle-themes-theme-list))
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(length cycle-themes-theme-list))
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cycle-themes-theme-list))
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;; Make sure we didn't loop all the way through
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(when (eq current-theme start-theme)
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(error "No valid themes in cycle-themes-theme-list"))
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(not (custom-theme-p current-theme))))
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current-theme))
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(defun cycle-themes ()
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"Cycle to the next theme."
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(interactive)
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(let ((new-theme (cycle-themes-get-next-valid-theme))
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(current-theme (first custom-enabled-themes))
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(current-theme-set custom-enabled-themes))
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;; disable the current theme only if we want multiple themes
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;; and we had it before
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(unless (and cycle-themes-allow-multiple-themes
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(member current-theme cycle-themes-last-theme-set))
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(disable-theme current-theme))
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(load-theme new-theme t)
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(setq cycle-themes-last-theme-set current-theme-set)
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(run-hooks 'cycle-themes-after-cycle-hook)))
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;;;###autoload
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(define-minor-mode cycle-themes-mode
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"Minor mode for cycling between themes."
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:lighter ""
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:keymap (let ((map (make-sparse-keymap)))
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(define-key map (kbd "C-c C-t") 'cycle-themes)
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map)
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:global t
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(progn
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;; remove any lingering themes other than the primary
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(dolist (theme (cl-set-difference (custom-available-themes)
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custom-enabled-themes))
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(disable-theme theme))
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;; If we _aren't_ already trying to start up
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(when cycle-themes-first-start
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(setq cycle-themes-first-start nil)
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;; if there are no themes enabled, enable
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;; the first one in the list
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(if (null custom-enabled-themes)
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(add-hook 'emacs-startup-hook
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#'(lambda ()
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(load-theme (car cycle-themes-theme-list))
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(run-hooks 'cycle-themes-after-cycle-hook)))
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;; otherwise, ensure they're _actually_ loaded
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(add-hook 'emacs-startup-hook #'(lambda ()
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(dolist (theme (reverse custom-enabled-themes))
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(load-theme theme))
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(run-hooks 'cycle-themes-after-cycle-hook)))))))
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(provide 'cycle-themes)
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;;; cycle-themes.el ends here
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