GNU ELPA - cursory

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Description
Manage cursor styles using presets
Latest
cursory-1.1.0.tar (.sig), 2024-Sep-14, 130 KiB
Maintainer
Protesilaos Stavrou <info@protesilaos.com>
Website
https://github.com/protesilaos/cursory
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Manual
cursory

To install this package from Emacs, use package-install or list-packages.

Full description

This manual, written by Protesilaos Stavrou, describes the customization options for cursory (or cursory.el), and provides every other piece of information pertinent to it.

The documentation furnished herein corresponds to stable version 1.1.0, released on 2024-09-14. Any reference to a newer feature which does not yet form part of the latest tagged commit, is explicitly marked as such.

Current development target is 1.2.0-dev.

1. COPYING

Copyright (C) 2022-2024 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with the Front-Cover Texts being “A GNU Manual,” and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled “GNU Free Documentation License.”

(a) The FSF’s Back-Cover Text is: “You have the freedom to copy and modify this GNU manual.”

2. Overview

Cursory provides a thin wrapper around built-in variables that affect the style of the Emacs cursor on graphical terminals. The intent is to allow the user to define preset configurations such as “block with slow blinking” or “bar with fast blinking” and set them on demand. The use-case for such presets is to adapt to evolving interface requirements and concomitant levels of expected comfort, such as in the difference between writing and reading.

The user option cursory-presets holds the presets. The command cursory-set-preset is applies one among them. The command supports minibuffer completion when there are multiple presets, else sets the single preset outright.

The cursory-set-preset comman calls the cursory-set-preset-hook as its final step. Use this to run other functions after changing the cursor (Example hooks after setting a preset). The variable cursory-last-selected-preset may prove useful.

Presets consist of an arbitrary symbol broadly described the style set followed by a list of properties that govern the cursor type in the active and inactive windows, as well as cursor blinking variables. They look like this:

(bar
 :cursor-type (bar . 2)
 :cursor-in-non-selected-windows hollow
 :blink-cursor-mode 1
 :blink-cursor-blinks 10
 :blink-cursor-interval 0.5
 :blink-cursor-delay 0.2)

The car of the list is an arbitrary, user-defined symbol that identifies (and can describe) the set. Each of the properties corresponds to built-in variables: cursor-type, cursor-in-non-selected-windows, blink-cursor-blinks, blink-cursor-interval, blink-cursor-delay. The value each property accepts is the same as the variable it references.

A property of :blink-cursor-mode is also available. It is a numeric value of either 1 or -1 and is given to the function blink-cursor-mode: 1 is to enable, -1 is to disable the mode.

Presets can inherit from each other. Using the special :inherit property, like this:

(setq cursory-presets
      '(
	;; Sample code here ...
	(bar
	 :cursor-type (bar . 2)
	 :cursor-in-non-selected-windows hollow
	 :blink-cursor-mode 1
	 :blink-cursor-blinks 10
	 :blink-cursor-interval 0.5
	 :blink-cursor-delay 0.2)

	(bar-no-other-window
	 :inherit bar
	 :cursor-in-non-selected-windows nil)
	;; More sample code here ...
	))

In the above example, the bar-no-other-window is the same as bar except for the value of :cursor-in-non-selected-windows.

The value given to the :inherit property corresponds to the name of another named preset (unquoted). This tells the relevant Cursory functions to get the properties of that given preset and blend them with those of the current one. The properties of the current preset take precedence over those of the inherited one, thus overriding them.

A preset whose car is t is treated as the default option. This makes it possible to specify multiple presets without duplicating their properties. Presets beside t act as overrides of the defaults and, as such, need only consist of the properties that change from the default. In the case of an :inherit, properties are first taken from the inherited preset and then the default one. See the original value of this variable for how that is done:

(defcustom cursory-presets
  '((box
     :blink-cursor-interval 0.8)
    (box-no-blink
     :blink-cursor-mode -1)
    (bar
     :cursor-type (bar . 2)
     :blink-cursor-interval 0.5)
    (bar-no-other-window
     :inherit bar
     :cursor-in-non-selected-windows nil)
    (underscore
     :cursor-type (hbar . 3)
     :blink-cursor-blinks 50)
    (underscore-thin-other-window
     :inherit underscore
     :cursor-in-non-selected-windows (hbar . 1))
    (t ; the default values
     :cursor-type box
     :cursor-in-non-selected-windows hollow
     :blink-cursor-mode 1
     :blink-cursor-blinks 10
     :blink-cursor-interval 0.2
     :blink-cursor-delay 0.2))
  ;; Omitting the doc string for demo purposes
  )

When called from Lisp, the cursory-set-preset command requires a PRESET argument, such as:

(cursory-set-preset 'bar)

The default behaviour of cursory-set-preset is to change cursors globally. The user can, however, limit the effect to the current buffer. With interactive use, this is done by invoking the command with a universal prefix argument (C-u by default). When called from Lisp, the LOCAL argument must be non-nil, thus:

(cursory-set-preset 'bar :local)

The function cursory-store-latest-preset is used to save the last selected style in the cursory-latest-state-file. The value can then be restored with the cursory-restore-latest-preset function.

Sample configuration.

Instead of manually storing the latest Cursory preset, users can enable the cursory-mode. It arranges to track the latest preset each time after using cursory-set-preset or Emacs is closed.

2.1. Example hooks after setting a preset

The cursory-set-preset-hook is a normal hook (where functions are invoked without any arguments), which is called after the command cursory-set-preset. Here are some ideas on how to use it:

;; Imagine you have a preset where you want minimal cursor styles.
;; You call this `focus' and want when you switch to it to change the
;; cursor color.
(defun my-cursory-change-color ()
"Change to a subtle color when the `focus' Cursory preset is selected."
  (if (eq cursory-last-selected-preset 'focus)
      (set-face-background 'cursor "#999999")
    (face-spec-recalc 'cursor nil)))

(defun my-cursory-change-color-disable-line-numbers ()
  "Disable line numbers if the Cursory preset is `presentation' or `focus'."
  (when (member cursory-last-selected-preset '(presentation focus))
    (display-line-numbers-mode -1)))

I am happy to include more examples here, if users have any questions.

3. Installation

3.1. GNU ELPA package

The package is available as cursory. Simply do:

M-x package-refresh-contents
M-x package-install

And search for it.

GNU ELPA provides the latest stable release. Those who prefer to follow the development process in order to report bugs or suggest changes, can use the version of the package from the GNU-devel ELPA archive. Read: https://protesilaos.com/codelog/2022-05-13-emacs-elpa-devel/.

3.2. Manual installation

Assuming your Emacs files are found in ~/.emacs.d/, execute the following commands in a shell prompt:

cd ~/.emacs.d

# Create a directory for manually-installed packages
mkdir manual-packages

# Go to the new directory
cd manual-packages

# Clone this repo, naming it "cursory"
git clone https://github.com/protesilaos/cursory cursory

Finally, in your init.el (or equivalent) evaluate this:

;; Make Elisp files in that directory available to the user.
(add-to-list 'load-path "~/.emacs.d/manual-packages/cursory")

Everything is in place to set up the package.

4. Sample configuration

Remember to read the doc string of each of these variables or functions.

(require 'cursory)

;; Check the `cursory-presets' for how to set your own preset styles.

(setq cursory-latest-state-file (locate-user-emacs-file "cursory-latest-state"))

;; Set last preset or fall back to desired style from `cursory-presets'.
(cursory-set-preset (or (cursory-restore-latest-preset) 'bar))

;; Arrange to keep track of the latest Cursory preset.
(cursory-mode 1)

;; We have to use the "point" mnemonic, because C-c c is often the
;; suggested binding for `org-capture'.
(define-key global-map (kbd "C-c p") #'cursory-set-preset)

5. Acknowledgements

Cursory is meant to be a collective effort. Every bit of help matters.

Author/maintainer
Protesilaos Stavrou.
Contributions to the code or manual
Christopher League, Mehdi Khawari, Nicholas Vollmer, Philip Kaludercic, Stefan Monnier.

6. Also see

The electric-cursor package by Case Duckworth lets the user automatically change the cursor style when a certain mode is activated. For example, the box is the default and switches to a bar when overwrite-mode is on: https://github.com/duckwork/electric-cursor.

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recommend releasing these examples in parallel under your choice of
free software license, such as the GNU General Public License,
to permit their use in free software.

Old versions

cursory-1.0.1.tar.lz2024-Mar-3121.4 KiB
cursory-1.0.0.tar.lz2023-Jun-0921.2 KiB
cursory-0.3.0.tar.lz2022-Sep-0419.3 KiB
cursory-0.2.1.tar.lz2022-Jul-0117.8 KiB
cursory-0.1.4.tar.lz2022-Apr-2212.1 KiB

News

This document contains the release notes for each tagged commit on the project’s main git repository: https://github.com/protesilaos/cursory.

The newest release is at the top. For further details, please consult the manual: https://protesilaos.com/emacs/cursory.

Table of Contents

1. Version 1.1.0 on 2024-09-14

Cursory is in a stable state. This version includes quality-of-life refinements.

1.1. The cursory-mode simplifies how the state is stored

Cursory has functions to store and restore its state. In previous versions, we would document how to use those by adding them to the relevant hooks. This approach still works, though we now provide an easier way to achieve the same result: just enable the cursory-mode.

Technically, all this does is to set the hooks if enabled, and unsets them if disabled.

The “restore” phase is the same as before. For example:

;; Set last preset, if available, or fall back to the `bar' preset
;; from the `cursory-presets'.
(cursory-set-preset (or (cursory-restore-latest-preset) 'bar))

1.2. Use the cursory-set-preset-hook

The cursory-set-preset-hook is a normal hook (where functions are invoked without any arguments), which is called after the command cursory-set-preset. Here are some ideas on how to use it:

;; Imagine you have a preset where you want minimal cursor styles.
;; You call this `focus' and want when you switch to it to change the
;; cursor color.
(defun my-cursory-change-color ()
"Change to a subtle color when the `focus' Cursory preset is selected."
  (if (eq cursory-last-selected-preset 'focus)
      (set-face-background 'cursor "#999999")
    (face-spec-recalc 'cursor nil)))

;; Here we just show how to disable a given mode.  Of course, we can
;; have something more sophisticated, which stores the last value and
;; restores it if the condition we are testing for here is not met.
;; Keeping it simple for now.
(defun my-cursory-change-color-disable-line-numbers ()
  "Disable line numbers if the Cursory preset is `presentation' or `focus'."
  (when (member cursory-last-selected-preset '(presentation focus))
    (display-line-numbers-mode -1)))

I am happy to include more examples here, if users have any questions.

1.3. Miscellaneous

  • Fixed a dependency for older Emacs versions. The subr-x, which is built into Emacs, needs to be explicitly loaded at compile time. This makes some parts of the code work as expected. Thanks to Mehdi Khawari for reporting the problem and Nicholas Vollmer for suggesting this change. The exchange took place in issue 1: https://github.com/protesilaos/cursory/issues/1. Users should already have this change, as I published a minor release for it (version 1.0.1).
  • Added some missing metadata to the manual. This is useful for the indices and COPYING section.
  • Updated the relevant links to the package sources. The main repository is now on GitHub.

2. Version 1.0.0 on 2023-06-09

Cursory has been in a stable state for a long time. I use it daily and am happy with what it does. This version refactors parts of the code in the interest of legibility/hackability, while providing a quality-of-life feature for users.

2.1. A preset can now inherit from another

In the interest of defining multiple presets while avoiding duplication, the user option cursory-presets now accepts an … …