101 lines
3.4 KiB
EmacsLisp
101 lines
3.4 KiB
EmacsLisp
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;;; core/autoload/fonts.el -*- lexical-binding: t; -*-
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(defvar doom-font-increment 2
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"How many steps to increase the font size each time `doom/increase-font-size'
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or `doom/decrease-font-size' are invoked.")
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(defvar doom-big-font-increment 14
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"How many steps to increase the font size (with `doom-font' as the base) when
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`doom-big-font-mode' is enabled.")
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(defvar doom-change-font-size-hook nil
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"A hook run after adjusting the font size with `doom/increase-font-size',
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`doom/decrease-font-size', or `doom/reset-font-size'.")
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;;
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;;; Library
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(defun doom--font-name (fontname frame)
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(when (query-fontset fontname)
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(when-let* ((ascii (assq 'ascii (aref (fontset-info fontname frame) 2))))
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(setq fontname (nth 2 ascii))))
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(or (x-decompose-font-name fontname)
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(error "Cannot decompose font name")))
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;;;###autoload
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(defun doom-adjust-font-size (increment &optional frame)
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"Increase size of font in FRAME by INCREMENT.
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Interactively, INCREMENT is given by the prefix argument.
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Optional FRAME parameter defaults to current frame."
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(interactive "p")
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(let* ((frame (or frame (selected-frame)))
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(font (frame-parameter frame 'font))
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(font (doom--font-name font frame)))
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(let ((new-size (+ (string-to-number (aref font xlfd-regexp-pixelsize-subnum))
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increment)))
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(unless (> new-size 0)
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(error "Font is to small at %d" new-size))
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(aset font xlfd-regexp-pixelsize-subnum (number-to-string new-size)))
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;; Set point size & width to "*", so frame width will adjust to new font size
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(aset font xlfd-regexp-pointsize-subnum "*")
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(aset font xlfd-regexp-avgwidth-subnum "*")
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(setq font (x-compose-font-name font))
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(unless (x-list-fonts font)
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(error "Cannot change font size"))
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(modify-frame-parameters frame `((font . ,font)))))
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;;
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;;; Commands
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;;;###autoload
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(defun doom/increase-font-size (count)
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"Enlargens the font size across the current frame."
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(interactive "p")
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(let ((zoom-factor (or (frame-parameter nil 'font-scale) 0))
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(increment (* count doom-font-increment)))
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(setq zoom-factor (+ zoom-factor increment))
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(if (= zoom-factor 0)
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(doom/reset-font-size)
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(doom-adjust-font-size increment)
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(modify-frame-parameters nil `((font-scale . ,zoom-factor)))
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(run-hooks 'doom-change-font-size-hook))))
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;;;###autoload
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(defun doom/decrease-font-size (count)
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"Shrinks the font size across the current frame."
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(interactive "p")
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(doom/increase-font-size (- count)))
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;;;###autoload
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(defun doom/reset-font-size ()
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"Reset font size.
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Assuming it has been adjusted via `doom/increase-font-size' and
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`doom/decrease-font-size'."
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(interactive)
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(let ((zoom-factor (frame-parameter nil 'font-scale)))
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(if (not zoom-factor)
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(user-error "Font size hasn't been changed")
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(set-frame-font doom-font t)
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(modify-frame-parameters nil '((font-scale)))
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(run-hooks 'doom-change-font-size-hook))))
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;;;###autoload
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(define-minor-mode doom-big-font-mode
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"A global mode that resizes the font, for streams, screen-sharing and
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presentations.
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This uses `doom/increase-font-size' under the hood, and enlargens the font by
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`doom-big-font-increment'."
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:init-value nil
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:lighter " BIG"
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:global t
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(unless doom-font
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(user-error "`doom-font' must be set to a valid font"))
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(let ((frame (selected-frame)))
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(set-frame-font doom-font t (list frame))
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(when doom-big-font-mode
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(doom-adjust-font-size doom-big-font-increment frame))))
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