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;; Most of the code in this file is based on:
;; https://git.sr.ht/~protesilaos/dotfiles/tree/cf26bc34/item/emacs/.emacs.d/prot-lisp/prot-modeline.el
;;
;; All Kudos to Prot.
;;;; Faces
(defface rul-modeline-indicator-red
'((default :inherit bold)
(((class color) (min-colors 88) (background light))
:foreground "#880000")
(((class color) (min-colors 88) (background dark))
:foreground "#ff9f9f")
(t :foreground "red"))
"Face for modeline indicators.")
;;;; Common helper functions
(defcustom rul-modeline-string-truncate-length 9
"String length after which truncation should be done in small windows."
:type 'natnum)
(defun rul-modeline--string-truncate-p (str)
"Return non-nil if STR should be truncated."
(and (< (window-total-width) split-width-threshold)
(> (length str) rul-modeline-string-truncate-length)
(not (one-window-p :no-minibuffer))))
(defun rul-modeline-string-truncate (str)
"Return truncated STR, if appropriate, else return STR.
Truncation is done up to `rul-modeline-string-truncate-length'."
(if (rul-modeline--string-truncate-p str)
(concat (substring str 0 rul-modeline-string-truncate-length) "...")
str))
;;;; Major mode
(defun rul-modeline-major-mode-indicator ()
"Return appropriate propertized mode line indicator for the major mode."
(let ((indicator (cond
((derived-mode-p 'text-mode) "§")
((derived-mode-p 'prog-mode) "λ")
((derived-mode-p 'comint-mode) ">_")
(t "◦"))))
(propertize indicator 'face 'shadow)))
(defun rul-modeline-major-mode-name ()
"Return capitalized `major-mode' without the -mode suffix."
(capitalize (string-replace "-mode" "" (symbol-name major-mode))))
(defun rul-modeline-major-mode-help-echo ()
"Return `help-echo' value for `rul-modeline-major-mode'."
(if-let ((parent (get major-mode 'derived-mode-parent)))
(format "Symbol: `%s'. Derived from: `%s'" major-mode parent)
(format "Symbol: `%s'." major-mode)))
(defvar-local rul-modeline-major-mode
(list
(propertize "%[" 'face 'rul-modeline-indicator-red)
'(:eval
(concat
(rul-modeline-major-mode-indicator)
" "
(propertize
(rul-modeline-string-truncate
(rul-modeline-major-mode-name))
'mouse-face 'mode-line-highlight
'help-echo (rul-modeline-major-mode-help-echo))))
(propertize "%]" 'face 'rul-modeline-indicator-red))
"Mode line construct for displaying major modes.")
;(makunbound 'rul-modeline-major-mode)
;;;; Align right
(defun prot-modeline--right-align-rest ()
"Return string if everything after `prot-modeline-align-right'."
(format-mode-line
`(""
,@(cdr (memq 'prot-modeline-align-right mode-line-format)))))
(defun prot-modeline--right-align-width ()
"Return pixel width of `prot-modeline--right-align-rest'."
(string-pixel-width (prot-modeline--right-align-rest)))
(defun prot-modeline--box-p ()
"Return non-nil if the `mode-line' has a box attribute."
(and (face-attribute 'mode-line :box)
(null (eq (face-attribute 'mode-line :box) 'unspecified))))
(defun prot-modeline--variable-pitch-p ()
"Return non-nil if the `mode-line' inherits `variable-pitch'."
(when-let* ((mode-line-inherit (face-attribute 'mode-line :inherit))
((string-match-p "variable-pitch" (symbol-name mode-line-inherit)))
(family-face (face-attribute mode-line-inherit :inherit))
(variable-pitch
(if (listp family-face)
(memq 'variable-pitch family-face)
(eq 'variable-pitch family-face))))
variable-pitch))
(defun prot-modeline--magic-number ()
"Return constant for use in `prot-modeline-align-right'."
(let ((height (face-attribute 'mode-line :height nil 'default))
(m-width (string-pixel-width (propertize "m" 'face 'mode-line))))
(round height (* m-width (* height m-width 0.001)))))
(defvar-local prot-modeline-align-right
'(:eval
(propertize
" "
'display
(let ((box-p (prot-modeline--box-p))
(variable-pitch-p (prot-modeline--variable-pitch-p))
(magic-number (prot-modeline--magic-number)))
`(space
:align-to
(- right
right-fringe
right-margin
,(ceiling
(prot-modeline--right-align-width)
(string-pixel-width (propertize "m" 'face 'mode-line)))
,(cond
((and variable-pitch-p box-p)
(* magic-number 0.5))
((and (not variable-pitch-p) box-p)
(* magic-number 0.25))
((and variable-pitch-p (not box-p))
(* magic-number -0.05))
(t (* magic-number -0.1))))))))
"Mode line construct to align following elements to the right.
Read Info node `(elisp) Pixel Specification'.")
;;;; Variables used in the modeline need to be in `risky-local-variable'.
(dolist (construct '(
rul-modeline-major-mode
rul-modeline-misc-info
prot-modeline-align-right
))
(put construct 'risky-local-variable t))
;;;; Miscellaneous
(defvar-local rul-modeline-misc-info
'(:eval
(when (mode-line-window-selected-p)
mode-line-misc-info))
"Mode line construct displaying `mode-line-misc-info'.
Specific to the current window's mode line.")
;;;; Finally, define the modeline format
(setq-default mode-line-format
'("%e"
mode-line-front-space
mode-line-buffer-identification
mode-line-front-space
rul-modeline-major-mode
prot-modeline-align-right
rul-modeline-misc-info
))
(provide 'rul-modeline)
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