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(Emacs/elisp)~refactor better-mode-line

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New namespace that's tiny bit less verbose, and refactor on padding
generation to stop repeating myself.
This commit is contained in:
Aryadev Chavali
2024-07-02 13:21:32 +01:00
parent 8df9015d09
commit 54a00ccd3d
1 changed files with 24 additions and 33 deletions
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57
Emacs/.config/emacs/elisp/better-mode-line.el
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@@ -27,16 +27,16 @@
;;; Code:
(defvar +better-mode-line/left-segment nil
(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
(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
(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
(defconst better-mode-line/--minimum-padding 4
"Minimum size of padding string.")
(defun +better-mode-line/evil-state ()
@@ -51,47 +51,38 @@ the first character of the evil state capitalised"
0 1))
"")))
(defun +better-mode-line/--get-padding-size (centre-size other-size)
(let* ((win-width (window-width))
(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)))))
(- (/ width 2) (/ centre-size 2) other-size)))
(- (floor (/ width 2)) (floor (/ centre-size 2)) other-size)))
(defun +better-mode-line/--left->centre-padding ()
"Returns a string which pads the centre segment perfectly relative
to the left segment."
(let* ((left-segment-size (length (format-mode-line +better-mode-line/left-segment)))
(centre-segment-size (length (format-mode-line +better-mode-line/centre-segment)))
(padding-size (+better-mode-line/--get-padding-size centre-segment-size left-segment-size)))
(make-string (if (< padding-size +better-mode-line/--minimum-padding)
+better-mode-line/--minimum-padding
(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/--centre->right-padding ()
"Returns a string which pads the right segment perfectly relative
to the centre segment"
(let* ((centre-segment-size (length (format-mode-line +better-mode-line/centre-segment)))
(right-segment-size (length (format-mode-line +better-mode-line/right-segment)))
(padding-size (+better-mode-line/--get-padding-size centre-segment-size right-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 ()
(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/--left->centre-padding))
,@+better-mode-line/centre-segment
(:eval (+better-mode-line/--centre->right-padding))
,@+better-mode-line/right-segment)))
`(,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