Aryadev Chavali
12b62f7cea
Using left, centre and right segments generates a mode line with padded strings that actually achieves this.
90 lines
3.6 KiB
EmacsLisp
90 lines
3.6 KiB
EmacsLisp
;;; better-mode-line.el --- A better mode-line system designed by me -*- lexical-binding: t; -*-
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;; Copyright (C) 2024 Aryadev Chavali
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;; Author: Aryadev Chavali <aryadev@aryadevchavali.com>
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;; Keywords:
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; There are 3 lists for the left, centre and right of the mode-line. They're
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;; the same as mode-line-format in terms of general schema as they're fed
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;; directly into that variable. Padding strings are automatically generated
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;; based on these segments so be sure to set these.
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;;; Code:
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(defun +better-mode-line/evil-state ()
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"Returns either the empty string if no evil-state is defined or
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the first character of the evil state capitalised"
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(with-eval-after-load "evil"
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(if (bound-and-true-p evil-state)
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(upcase
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(substring
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(format "%s"
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evil-state)
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0 1))
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"")))
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(defvar +better-mode-line/left-segment nil
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"List of elements that are placed on the left of the mode-line")
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(defvar +better-mode-line/centre-segment nil
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"List of elements that should be on the centre of the mode-line")
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(defvar +better-mode-line/right-segment nil
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"List of elements that should be on the right of the mode-line")
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(defconst +better-mode-line/--minimum-padding 4
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"Minimum size of padding string.")
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(defun +better-mode-line/--left->centre-padding ()
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"Returns a string which pads the centre segment perfectly relative
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to the left segment."
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(let* ((left-segment-size (length (format-mode-line +better-mode-line/left-segment)))
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(centre-segment-size (length (format-mode-line +better-mode-line/centre-segment)))
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(padding-size (- (/ (window-width) 2) (/ centre-segment-size 2) left-segment-size)))
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(make-string (if (< padding-size +better-mode-line/--minimum-padding)
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+better-mode-line/--minimum-padding
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padding-size)
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?\s)))
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(defun +better-mode-line/--centre->right-padding ()
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"Returns a string which pads the right segment perfectly relative
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to the centre segment"
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(let* ((centre-segment-size (length (format-mode-line +better-mode-line/centre-segment)))
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(right-segment-size (length (format-mode-line +better-mode-line/right-segment)))
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(padding-size (- (/ (window-width) 2) (/ centre-segment-size 2) right-segment-size)))
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(make-string (if (< padding-size +better-mode-line/--minimum-padding)
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+better-mode-line/--minimum-padding
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padding-size)
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?\s)))
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(defun +better-mode-line/setup-mode-line ()
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"Call this to setup the mode-line when:
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- first loading the package.
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- segments are updated."
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(setq-default mode-line-format
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`(,@+better-mode-line/left-segment
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(:eval (+better-mode-line/--left->centre-padding))
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,@+better-mode-line/centre-segment
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(:eval (+better-mode-line/--centre->right-padding))
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,@+better-mode-line/right-segment)))
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(provide 'better-mode-line)
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;;; better-mode-line.el ends here
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