diff options
| -rw-r--r-- | lib/eos/xmobar.el | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/lib/eos/xmobar.el b/lib/eos/xmobar.el new file mode 100644 index 0000000..4d27781 --- /dev/null +++ b/lib/eos/xmobar.el @@ -0,0 +1,150 @@ +;; xmobar.el --- Display xmobar text output -*- lexical-binding: t -*- + +;; Copyright 2022 jao <jao@gnu.org> +;; Version: 0.0.1 +;; Package-Requires: ((emacs "28.1")) +;; Keywords: unix + +;; Heavily inspired by Steven Allen's https://github.com/Stebalien/i3bar.el + +;; This file is not part of GNU Emacs. + +;; This file 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, or (at your option) +;; any later version. + +;; This file 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; see the file COPYING. If not, write to +;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;;; Commentary: + +;; Displays the output of an xmobar command in the Emacs mode-line (or tab-line). + +;;; Code: + +(eval-when-compile (require 'cl-lib)) + +(require 'xterm-color nil t) + +(defvar xmobar--last-update nil + "The last xmobar update received.") + +(defvar xmobar--process nil + "The running xmobar process, if any.") + +(defvar xmobar-string "" + "The xmobar string displayed in the mode-line.") + +(put 'xmobar-string 'risky-local-variable t) + +(defgroup xmobar nil + "xmobar status display for Emacs." + :version "0.0.1" + :group 'mode-line) + +(defcustom xmobar-command "xmobar" + "The xmobar command and flags." + :type '(choice (string :tag "Shell Command") + (repeat (string)))) + +(defcustom xmobar-tab-bar t + "Whether to dispaly xmobar output in the tab bar." + :type 'boolean) + +(defcustom xmobar-tab-bar-format '(tab-bar-format-align-right xmobar-string) + "Format for the tab bar when `xmobar-tab-bar' is t." + :type 'list) + +(defvar xmobar--colorize-fn + (if (featurep 'xterm-color) #'xterm-color-filter #'ansi-color-apply)) + +(defun xmobar-string () xmobar-string) + +;;;###autoload +(define-minor-mode xmobar-mode + "Display an xmobar in the mode-line." + :global t :group 'xmobar + (xmobar--stop) + (when xmobar-mode + (if xmobar-tab-bar + (unless (memq 'xmobar-string tab-bar-format) + (setq tab-bar-format xmobar-tab-bar-format) + (tab-bar-mode)) + (or global-mode-string (setq global-mode-string '(""))) + (unless (memq 'xmobar-string global-mode-string) + (setq global-mode-string (append global-mode-string '(xmobar-string))))) + (xmobar--start))) + +(defun xmobar--update (update) + "Apply an UPDATE to the xmobar bar." + (setq xmobar--last-update (funcall xmobar--colorize-fn update)) + (when xmobar-mode + (setq xmobar-string xmobar--last-update) + (force-mode-line-update t))) + +(defun xmobar--process-filter (proc string) + "Process output from the xmobar process." + (let ((buf (process-buffer proc))) + (when (buffer-live-p buf) + (with-current-buffer buf + ;; Write the input to the buffer (might be partial). + (save-excursion + (goto-char (process-mark proc)) + (insert string) + (set-marker (process-mark proc) (point))) + (when (string-match-p "\n$" string) + (xmobar--update (buffer-string)) + (delete-region (point-min) (point-max))))))) + +(defun xmobar--process-sentinel (proc status) + "Handle events from the xmobar process (PROC). +If the process has exited, this function stores the exit STATUS in +`xmobar-string'." + (unless (process-live-p proc) + (setq xmobar--process nil) + (let ((buf (process-buffer proc))) + (when (and buf (buffer-live-p buf)) (kill-buffer buf))) + (setq xmobar--last-update nil + xmobar-string (format "xmobar: %s" status)))) + +(defun xmobar--start () + "Start xmobar." + (xmobar--stop) + (condition-case err + (setq xmobar--process + (make-process + :name "xmobar" + :buffer " *xmobar process*" + :stderr " *xmobar stderr*" + :command (ensure-list xmobar-command) + :connection-type 'pipe + :noquery t + :sentinel #'xmobar--process-sentinel + :filter #'xmobar--process-filter)) + (error + (setq xmobar-string + (format "starting xmobar: %s" (error-message-string err)))))) + +(defun xmobar--stop () + "Stop xmobar." + (when (and xmobar--process (process-live-p xmobar--process)) + (delete-process xmobar--process)) + (setq xmobar-string "" xmobar--last-update nil)) + +;;;###autoload +(defun xmobar-restart () + "Restart the xmobar program." + (interactive) + (unless xmobar-mode (user-error "The xmobar-mode is not enabled")) + (xmobar--start)) + +(provide 'xmobar) +;;; xmobar.el ends here |