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;; 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 'tab-bar)
(require 'xterm-color nil t)
(defgroup xmobar nil
"xmobar status display for Emacs."
:version "0.0.1"
:group 'mode-line)
(defcustom xmobar-command '("xmobar" "-TAnsi")
"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-split nil
"Split on this string for `xmobar-left-string' and `xmobar-right-string'."
:type 'string)
(defcustom xmobar-tab-bar-format
'(xmobar-left-string xmobar-elastic-space xmobar-right-string)
"Format for the tab bar when `xmobar-tab-bar' is t."
:type 'list)
(defvar xmobar--process nil
"The running xmobar process, if any.")
(defvar xmobar--left-string "")
(defvar xmobar-string ""
"The xmobar string to be displayed in the mode-line or tab-bar.")
(put 'xmobar-string 'risky-local-variable t)
(defvar xmobar--colorize-fn
(if (featurep 'xterm-color) #'xterm-color-filter #'ansi-color-apply))
(defvar xmobar--old-tab-format tab-bar-format)
(defvar xmobar--len 0)
(defun xmobar-string () xmobar-string)
(defun xmobar-right-string () xmobar-string)
(defun xmobar-left-string () xmobar--left-string)
(defun xmobar-elastic-space () (make-string (- (frame-width) xmobar--len 3) ? ))
;;;###autoload
(define-minor-mode xmobar-mode
"Display an xmobar in the mode-line."
:global t :group 'xmobar
(xmobar--stop)
(if xmobar-mode
(progn (if xmobar-tab-bar
(progn
(setq xmobar--old-tab-format tab-bar-format)
(setq tab-bar-format xmobar-tab-bar-format)
(tab-bar-mode 1))
(or global-mode-string (setq global-mode-string '("")))
(unless (memq 'xmobar-string global-mode-string)
(add-to-list 'global-mode-string 'xmobar-string t)))
(xmobar--start))
(when xmobar-tab-bar (setq tab-bar-format xmobar--old-tab-format))))
(defun xmobar--update (update)
"Apply an UPDATE to the xmobar bar."
(when xmobar-mode
(let* ((str (funcall xmobar--colorize-fn update))
(strs (and xmobar-tab-split (split-string str xmobar-tab-split))))
(setq xmobar-string (if strs (cadr strs) str)
xmobar--left-string (or (car strs) "")
xmobar--len (+ (string-width xmobar--left-string)
(string-width xmobar-string))))
(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-substring (point-min) (- (point-max) 1)))
(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-string (format "xmobar: %s" status) xmobar--left-string "")))
(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))
xmobar--left-string ""))))
(defun xmobar--stop ()
"Stop xmobar."
(when (and xmobar--process (process-live-p xmobar--process))
(delete-process xmobar--process))
(setq xmobar-string "" xmobar--left-string ""))
;;;###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
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