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text-scale+.el
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text-scale+.el
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;;; text-scale+.el --- Hot-patch text-scale-mode with multi-face support -*- lexical-binding: t -*-
;; Copyright (C) 2020 Andriy B. Kmit'
;; Author: Andriy B. Kmit' <dev@madand.net>
;; Keywords: faces, text scale, display, user commands
;; URL: https://github.com/madand/text-scale-plus.el
;; Package-Requires: ((emacs "24.4"))
;; This file is NOT part of GNU Emacs.
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; `text-scale+' hot-patches `text-scale-mode' with support for adjusting
;; the font size of multiple faces at once.
;; The vanilla Emacs' `text-scale-mode' only adjusts the `default' face. So when
;; you use `text-scale-mode' in a buffer that happens to contain some text
;; fragments displayed with non-`default' face (e.g. `variable-pitch'), you'll
;; notice that their font size won't change. Things become ugly if you happen to
;; use `eww' (the Emacs' built-in web browser) with proportional fonts rendering
;; enabled (the default) — the entire EWW buffer just won't scale at all.
;; `text-scale+' solves the aforementioned issue of the current
;; `text-scale-mode' implementation by hot-patching. Hot-patching in this case
;; means that after you have loaded this package, `text-scale-mode' will be
;; "fixed" completely transparently to you. All your keybindings and custom
;; settings (e.g. `text-scale-mode-step') will work the same as before.
;;; Installation
;; #### Manual installation
;; Download the file `text-scale+.el` from this repo and put it somewhere in
;; your `load-path'.
;; ```shell
;; # Download the latest version of the package
;; mkdir -p ~/path/to/text-scale+
;; cd ~/path/to/text-scale+
;; wget -q 'https://github.com/madand/text-scale-plus.el/raw/master/text-scale+.el'
;; # Or clone the whole repo with Git
;; git clone 'https://github.com/madand/text-scale-plus.el.git' ~/path/to/text-scale+
```
;; Now update the load path in your `init.el':
;; ```elisp
;; (add-to-load-path (expand-file-name "~/path/to/text-scale+"))
;; ```
;; #### Loading
;; Add one of the follwing to your `init.el'.
;; ##### With `require'
;; ```elisp
;; (with-eval-after-load 'face-remap
;; (require 'text-scale+))
;; ```
;; ##### With `use-package'
;; ```elisp
;; (use-package text-scale+
;; :after face-remap
;; ```
;; #### Installation from MELPA
;; Not yet there.
;;; Configuration
;; #### Variable `text-scale+-faces-list'
;; **Default**: `(default fixed-pitch fixed-pitch-serif variable-pitch)`
;; List of the faces to be adjusted by the `text-scale-mode'.
;; Customize: `M-x customize-variable RET text-scale+-faces-list RET`.
;; Examples with elisp:
;; ```elisp
;; ;; Change the global value
;; (setq text-scale+-faces-list '(default fixed-pitch))
;;
;; ;; Change the value only in `custom-mode' buffers
;; (add-hook 'custom-mode-hook
;; (lambda ()
;; (setq-local text-scale+-faces-list '(default))))
;; ```
;;; Code:
;; This is needed to prevent the "error: void variable text-scale+-faces-list".
(eval-when-compile
(require 'custom))
(defcustom text-scale+-faces-list '(default fixed-pitch fixed-pitch-serif
variable-pitch)
"List of faces to be adjusted by the `text-scale-mode'.
This variable is only taken into account if the overrides by
`text-scale+' are in effect. See `text-scale+-install'."
:type '(repeat face)
:group 'display)
;; List of remapping cookies for handled faces
(defvar text-scale+--remappings '())
(make-variable-buffer-local 'text-scale+--remappings)
;; Silence the byte compiler
(defvar text-scale-mode)
(defvar text-scale-mode-amount)
(defvar text-scale-mode-lighter)
(defvar text-scale-mode-step)
(defvar text-scale-mode-hook)
(declare-function face-remap-remove-relative "face-remap" (cookie))
(declare-function text-scale-max-amount "face-remap" ())
(declare-function text-scale-min-amount "face-remap" ())
(define-minor-mode text-scale+--text-scale-mode
"Minor mode for enhancing the `text-scale-mode' behavior.
You SHOULD NOT use this mode directly. Instead, call the command
`text-scale+-install' in order to augment the `text-scale-mode'
behavior.
This mode makes multiple faces adjustable with `text-scale-mode'.
See `text-scale+-faces-list'."
:lighter (" " text-scale-mode-lighter)
:require 'face-remap
:variable text-scale-mode
(when text-scale+--remappings
(dolist (remapping text-scale+--remappings)
(face-remap-remove-relative remapping))
(setq text-scale+--remappings '()))
(setq text-scale-mode-lighter
(format (if (>= text-scale-mode-amount 0) "+%d" "%d")
text-scale-mode-amount))
(when text-scale-mode
(dolist (face text-scale+-faces-list)
(push (face-remap-add-relative face
:height (expt text-scale-mode-step
text-scale-mode-amount))
text-scale+--remappings)))
(force-window-update (current-buffer)))
(defun text-scale+--run-text-scale-mode-hooks ()
"Run all hooks from `text-scale-mode-hook'."
(run-hooks 'text-scale-mode-hook))
;;;###autoload
(defun text-scale+-install ()
"Patch the `text-scale-mode' with multi-face support.
This function will be called automatically once you've loaded
the `text-scale+' package."
(interactive)
(add-hook 'text-scale+--text-scale-mode-hook
#'text-scale+--run-text-scale-mode-hooks)
(advice-add 'text-scale-mode :override #'text-scale+--text-scale-mode))
;;;###autoload
(defun text-scale+-uninstall ()
"Un-patch the `text-scale-mode'.
Revert all changes applied by `text-scale+-install'."
(interactive)
(remove-hook 'text-scale+--text-scale-mode-hook
#'text-scale+--run-text-scale-mode-hooks)
(advice-remove 'text-scale-mode #'text-scale+--text-scale-mode))
(defun text-scale+-unload-function ()
(text-scale+-uninstall)
(unintern 'text-scale+--text-scale-mode-hook nil)
(unintern 'text-scale+--remappings nil))
;; Path the `text-scale-mode' immediately after we loaded.
(text-scale+-install)
(provide 'text-scale+)
;;; text-scale+.el ends here