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;;; better-mode-line.el --- A better mode-line system designed by me -*- lexical-binding: t; -*-
;; Copyright (C) 2024 Aryadev Chavali
;; Author: Aryadev Chavali <aryadev@aryadevchavali.com>
;; Keywords:
;; 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:
;; There are 3 lists for the left, centre and right of the mode-line. They're
;; the same as mode-line-format in terms of general schema as they're fed
;; directly into that variable. Padding strings are automatically generated
;; based on these segments so be sure to set these.
;;; Code:
(defvar better-mode-line/left-segment nil
"List of elements that are placed on the left of the mode-line")
(defvar better-mode-line/centre-segment nil
"List of elements that should be on the centre of the mode-line")
(defvar better-mode-line/right-segment nil
"List of elements that should be on the right of the mode-line")
(defconst better-mode-line/--minimum-padding 4
"Minimum size of padding string.")
(defun +better-mode-line/evil-state ()
"Returns either the empty string if no evil-state is defined or
the first character of the evil state capitalised"
(with-eval-after-load "evil"
(if (bound-and-true-p evil-state)
(upcase
(substring
(format "%s"
evil-state)
0 1))
"")))
(defun better-mode-line/--get-padding-size (other-size)
"Compute length of padding to ensure string of size OTHER is on an
extreme end to CENTRE-SEGMENT."
(let* ((centre-size (length (format-mode-line better-mode-line/centre-segment)))
(win-width (window-width))
(margins (window-margins))
(width (if (null (car margins))
win-width
(+ (car margins) win-width (cdr margins)))))
(- (floor (/ width 2)) (floor (/ centre-size 2)) other-size)))
(defun better-mode-line/--generate-padding (segment)
"Make padding string to separate center segment from SEGMENT."
(let* ((segment-size (length (format-mode-line segment)))
(padding-size (better-mode-line/--get-padding-size segment-size)))
(make-string (if (< padding-size better-mode-line/--minimum-padding)
better-mode-line/--minimum-padding
padding-size)
?\s)))
(defun better-mode-line/setup-mode-line ()
"Call this to setup the mode-line when:
- first loading the package.
- segments are updated."
(setq-default mode-line-format
`(,better-mode-line/left-segment
(:eval (better-mode-line/--generate-padding
better-mode-line/left-segment))
,better-mode-line/centre-segment
(:eval (better-mode-line/--generate-padding
better-mode-line/right-segment))
,better-mode-line/right-segment)))
(provide 'better-mode-line)
;;; better-mode-line.el ends here
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