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;;; simple-modeline-core.el --- The core libraries for simple-modeline -*- lexical-binding: t; -*-
;; Copyright (C) 2019-2021 Eder Elorriaga
;; 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:
;; The core libraries for simple-modeline.
;;; Code:
(defgroup simple-modeline nil
"A simple mode line."
:prefix "simple-modeline-"
:group 'mode-line)
(defvar simple-modeline--default-mode-line mode-line-format
"The former value of `mode-line-format'.")
;;
;; Options
;;
(defcustom simple-modeline-segments
'((simple-modeline-segment-modified
simple-modeline-segment-buffer-name)
(simple-modeline-segment-vc
simple-modeline-segment-major-mode))
"Simple modeline segments."
:type '(list (repeat :tag "Left aligned" function)
(repeat :tag "Right aligned" function))
:package-version '(simple-modeline . "1.2"))
;;
;; Faces
;;
(defface simple-modeline-space
'((t))
"Face for space used to alight the right segments in the mode-line.")
(defface simple-modeline-unimportant
'((t (:inherit (shadow))))
"Face for less important mode-line elements.")
(defface simple-modeline-status-modified
'((t (:inherit (font-lock-variable-name-face))))
"Face for the 'modified' indicator symbol in the mode-line.")
(defface simple-modeline-status-info
'((t (:inherit (font-lock-string-face))))
"Face for generic status indicators in the mode-line.")
(defface simple-modeline-status-success
'((t (:inherit (success))))
"Face used for success status indicators in the mode-line.")
(defface simple-modeline-status-warning
'((t (:inherit (warning))))
"Face for warning status indicators in the mode-line.")
(defface simple-modeline-status-error
'((t (:inherit (error))))
"Face for error status indicators in the mode-line.")
;;
;; Helpers
;;
(defun simple-modeline--format (left-segments right-segments)
"Return a string of `window-width' length containing LEFT-SEGMENTS and RIGHT-SEGMENTS, aligned respectively."
(let* ((left (simple-modeline--format-segments left-segments))
(right (simple-modeline--format-segments right-segments))
(reserve (length right)))
(concat
left
(propertize " "
'display `((space :align-to (- right ,reserve)))
'face '(:inherit simple-modeline-space))
right)))
(defun simple-modeline--format-segments (segments)
"Return a string from a list of SEGMENTS."
(format-mode-line (mapcar
(lambda (segment)
`(:eval (,segment)))
segments)))
(provide 'simple-modeline-core)
;;; simple-modeline-core.el ends here
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