GNU ELPA - logos

logos

Description
Simple focus mode and extras
Latest
logos-0.3.2.tar, 2022-Apr-22, 70.0 KiB
Maintainer
Protesilaos Stavrou <info@protesilaos.com>
Website
https://git.sr.ht/~protesilaos/logos
Browse ELPA's repository
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To install this package, run in Emacs:

M-x package-install RET logos RET

Full description

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

The documentation furnished herein corresponds to stable version 0.3.0, released on 2022-03-30. 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 0.4.0-dev.

1 COPYING

Copyright (C) 2022 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

This package provides a simple “focus mode” which can be applied to any buffer for reading, writing, or even doing a presentation. The buffer can be divided in pages using the page-delimiter, outline structure, or any other pattern. Commands are provided to move between those pages. These motions work even when narrowing is in effect (and they preserve it). logos.el is designed to be simple by default and easy to extend. This manual provides concrete examples to that end.

What constitutes a page delimiter is determined by the user options logos-outlines-are-pages and logos-outline-regexp-alist. By default, this only corresponds to the ^L character (which can be inserted using the standard keys with C-q C-l).

Logos does not define any key bindings. Try something like this, if you want:

(let ((map global-map))
  (define-key map [remap narrow-to-region] #'logos-narrow-dwim)
  (define-key map [remap forward-page] #'logos-forward-page-dwim)
  (define-key map [remap backward-page] #'logos-backward-page-dwim))

On standard Emacs, those key bindings are: C-x n n, C-x ], C-x [. The logos-narrow-dwim is not necessary for users who already know how to narrow effectively. Such users may still want to bind it to a key.

Logos provides some optional aesthetic tweaks which come into effect when the buffer-local logos-focus-mode is enabled. These will hide the mode line (logos-hide-mode-line), disable the buffer boundary indicators (indicate-buffer-boundaries), enable scroll-lock-mode (logos-scroll-lock), use variable-pitch-mode in non-programming buffers (logos-variable-pitch), make the buffer read-only (logos-buffer-read-only), and center the buffer in its window if the olivetti package is installed (logos-olivetti). All these variables are buffer-local.

Logos is the familiar word derived from Greek (watch my presentation on philosophy about Cosmos, Logos, and the living universe: https://protesilaos.com/books/2022-02-05-cosmos-logos-living-universe/), though it also stands for these two perhaps equally insightful backronyms about the mechanics of this package:

  1. ^L Only Generates Ostensible Slides
  2. Logos Optionally Garners Outline Sections

3 Installation

3.1 GNU ELPA package

The package is available as logos. Simply do:

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

And search for it.

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 "logos"
git clone https://git.sr.ht/~protesilaos/logos logos

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/logos")

Everything is in place to set up the package.

4 Sample configuration

Logos does not bind its own keys and does not make any opinionated changes out-of-the-box (Extra tweaks):

  • To get the do-what-I-mean page motions add your own key bindings. In the example below, they take the stead of forward-page (C-x ]) and backward-page (C-x [). The command logos-narrow-dwim need not be bound, especially if you are already familiar with the various narrowing commands (otherwise it maps to C-x n n in this example, assuming the default keys).
  • To have quick access to logos-focus-mode, bind it to a key. This mode checks the variables logos-hide-mode-line, logos-scroll-lock, logos-variable-pitch, logos-indicate-buffer-boundaries, logos-buffer-read-only, logos-olivetti (requires olivetti package) and applies their effects if they are non-nil. Note that everything is buffer-local, so it is possible to use file variables as described in the Emacs manual.
(require 'logos)

;; If you want to use outlines instead of page breaks (the ^L)
(setq logos-outlines-are-pages t)
(setq logos-outline-regexp-alist
      `((emacs-lisp-mode . "^;;;+ ")
	(org-mode . "^\\*+ +")
	(t . ,(or outline-regexp logos--page-delimiter))))

;; These apply when `logos-focus-mode' is enabled.  Their value is
;; buffer-local.
(setq-default logos-hide-mode-line nil
	      logos-scroll-lock nil
	      logos-variable-pitch nil
	      logos-indicate-buffer-boundaries nil
	      logos-buffer-read-only nil
	      logos-olivetti nil)

(let ((map global-map))
  (define-key map [remap narrow-to-region] #'logos-narrow-dwim)
  (define-key map [remap forward-page] #'logos-forward-page-dwim)
  (define-key map [remap backward-page] #'logos-backward-page-dwim)
  (define-key map (kbd "<f9>") #'logos-focus-mode))

5 Extra tweaks

This section contains snippets of code that extend the functionality of logos. These either apply to logos-focus-mode or enhance the page motions through the logos-page-motion-hook.

5.1 Center the buffer in its window

Install the excellent olivetti package by Paul W. Rankin. Then set logos-olivetti to non-nil.

The present author’s favourite settings given a fill-column of 72:

(setq olivetti-body-width 0.7
      olivetti-minimum-body-width 80
      olivetti-recall-visual-line-mode-entry-state t)

Though note that Olivetti works well even without a fill-column and auto-fill-mode disabled.

5.2 Automatically reveal Org or Outline subtree

The Logos page motions normally jump between positions. Though Org and Outline require that Logos also reveals the headings’ contents. This is necessary to avoid invisible motions inside a folded heading that contains subheadings. The unfolding only applies to the current entry. This is the relevant snippet from logos.el:

(defun logos--reveal-entry ()
  "Reveal Org or Outline entry."
  (cond
   ((and (eq major-mode 'org-mode)
	 (org-at-heading-p))
    (org-show-entry))
   ((or (eq major-mode 'outline-mode)
	(bound-and-true-p outline-minor-mode))
    (outline-show-entry))))

(add-hook 'logos-page-motion-hook #'logos--reveal-entry)

Users may prefer to reveal the entire subtree instead of the current entry: the heading at point and all of its subheadings. In this case, one may override the definition of logos--reveal-entry:

;; glue code to expand an Org/Outline heading
(defun logos--reveal-entry ()
  "Reveal Org or Outline entry."
  (cond
   ((and (eq major-mode 'org-mode)
	 (org-at-heading-p))
    (org-show-subtree))
   ((or (eq major-mode 'outline-mode)
	(bound-and-true-p outline-minor-mode))
    (outline-show-subtree))))

5.3 Recenter at the top upon page motion

Page motions normally reposition the point at the centre of the window if necessary (this is standard Emacs behaviour). To always change the placement invoke the recenter function with a numeric argument.

;; place point at the top when changing pages
(defun my-logos--recenter-top ()
  "Use `recenter' to reposition the view at the top."
  (recenter 0))

(add-hook 'logos-page-motion-hook #'my-logos--recenter-top)

The 0 argument refers to the topmost line. So 1 points to the line below and so on.

If the recentering should not affect specific modes, tweak the function accordingly:

(defvar my-logos-no-recenter-top-modes 
  '(emacs-lisp-mode lisp-interaction-mode))

(defun my-logos--recenter-top ()
  "Use `recenter' to reposition the view at the top."
  (unless (memq major-mode my-logos-no-recenter-top-modes)
    (recenter 0)))

Or simply exclude all programming modes:

(defun my-logos--recenter-top ()
  "Use `recenter' to reposition the view at the top."
  (unless (derived-mode-p 'prog-mode)
    (recenter 0)))

5.4 Use outlines and page breaks

By default, the page motions only move between the ^L delimiters. While the option logos-outlines-are-pages changes the behaviour to move between outline headings instead. What constitutes an “outline heading” is determined by the logos-outline-regexp-alist.

Provided this:

(setq logos-outlines-are-pages t)

The default value of logos-outline-regexp-alist will affect org-mode, emacs-lisp-mode, and any of their derivatives (e.g. lisp-interaction-mode (the standard scratch buffer) is based on emacs-lisp-mode). Its fallback value is whatever the major mode sets as an outline, else the standard ^L.

(setq logos-outline-regexp-alist
      `((emacs-lisp-mode . "^;;;+ ")
	(org-mode . "^\\*+ +")
	(t . ,(or outline-regexp logos--page-delimiter))))

It is possible to tweak those regular expressions to target both the outline and the page delimiters:

(setq logos-outline-regexp-alist
      `((emacs-lisp-mode . ,(format "\\(^;;;+ \\|%s\\)" (default-value 'page-delimiter)))
	(org-mode . ,(format "\\(^\\*+ +\\|%s\\)" (default-value 'page-delimiter)))
	(t . ,(or outline-regexp logos--page-delimiter))))

The form ,(format "\\(^;;;+ \\|%s\\)" logos--page-delimiter) expands to "\\(^;;;+ \\|^ \\)".

For Org it may be better to either not target the ^L or to also target the horizontal rule (five hyphens on a line, else the ^-\\{5\\}$ pattern). Putting it all together:

(setq logos-outline-regexp-alist
      `((emacs-lisp-mode . ,(format "\\(^;;;+ \\|%s\\)" logos--page-delimiter))
	(org-mode . ,(format "\\(^\\*+ +\\|^-\\{5\\}$\\|%s\\)" logos--page-delimiter))
	(t . ,(or outline-regexp logos--page-delimiter))))

Another Org-specific tweak is to use heading levels up to a specific number. The idea would be that anything below that number is not significant. For example, ^\\* + only applies to top-level headings, while ^\\*\\{1,3\\} + covers heading levels 1 through 3. Accounting for the aforementiond horizontal rle and generic page delimiter, the end result can look like this:

(setq logos-outline-regexp-alist
      `((emacs-lisp-mode . ,(format "\\(^;;;+ \\|%s\\)" logos--page-delimiter))
	(org-mode . ,(format "\\(^\\*\\{1,3\\} +\\|^-\\{5\\}$\\|%s\\)" logos--page-delimiter))
	(t . ,(or outline-regexp logos--page-delimiter))))

6 Acknowledgements

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

Author/maintainer
Protesilaos Stavrou.
Contributions to code or the manual
Daniel Mendler, Omar Antolín Camarena, Philip Kaludercic, Remco van ’t Veer, and user Ypot.
Ideas and user feedback
Daniel Mendler.

7 GNU Free Documentation License


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ADDENDUM: How to use this License for your documents

To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and
license notices just after the title page:

    Copyright (c)  YEAR  YOUR NAME.
    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, no Front-Cover Texts, and no Back-Cover Texts.
    A copy of the license is included in the section entitled "GNU
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If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
replace the "with...Texts." line with this:

    with the Invariant Sections being LIST THEIR TITLES, with the
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If you have Invariant Sections without Cover Texts, or some other
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If your document contains nontrivial examples of program code, we
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Old versions

logos-0.3.1.tar.lz2022-Apr-0717.4 KiB
logos-0.3.0.tar.lz2022-Mar-3017.4 KiB
logos-0.2.0.tar.lz2022-Mar-1716.5 KiB
logos-0.1.2.tar.lz2022-Mar-1114.9 KiB

News

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

Version 0.3.0 on 2022-03-30

This release basically contains one major refinement about how buffer narrowing is handled. In detail:

  1. If logos-outlines-are-pages is non-nil, it now includes the match of the page-delimiter regexp in the narrowed region and leaves point right after the page-delimiter—so in Org mode, after the stars. (It is better to leave point there than at the very beginning of the narrowed buffer to match the behavior of logos-forward-page-dwim when the buffer is not narrowed.) The inclusion of the delimiter helps retain any folding functionality associated with that line (e.g. Org headings).
  2. To avoid skipping pages in the narrowed case when point is at their outer boundaries, logos checks if you are right at the start of a page-delimiter and if so moves past the delimiter in the opposite direction of the given motion: so if you are moving back, it puts you after the delimiter, and if you are moving forward it puts you before the delimiter. (The bug was that if the point was at point-max while narrowed and moving forward, it would skip past a page and the same in the opposite direction with point-min.)
  3. Changed logos-narrow-dwim to call logos--narrow-to-page instead of narrow-to-page, so that it too includes the page-delimiter match in the page.
  4. The logos--page-p now always checks for the right delimiter, which may be that of the outline if logos-outlines-are-pages is non-nil. Whereas before it was hard-coded to the generic page-delimiter.

Thanks to Omar Antolín Camarena for commit 8c2e85033db982ef13a5e041012dc45d86d9de32 which covers the first three of the aforementioned points. The contribution was sent as a patch via email. Omar has already assigned copyright to the Free Software Foundation.

Version 0.2.0 on 2022-03-17

All functions or variables referenced herein have documentation strings and are also documented in the manual.

  • Implemented the user option logos-olivetti which is a buffer-local variable that is read when logos-focus-mode is enabled. This provides the glue code to integrate Logos with olivetti. Olivetti is a package by Paul W. Rankin which centres the contents of the buffer in its window.
  • Removed the do-it-yourself snippet that was present in the manual for piecing together Logos and Olivetti. The documentation has been updated accordingly. Users who followed the old method are advised to review their configurations.
  • Abstracted the state handling of the variables and modes that are affected by logos-focus-mode, based on feedback by Daniel Mendler. This improves how the code is written and makes it easier to extend it.
  • Introduced the user options logos-indicate-buffer-boundaries and logos-buffer-read-only. Both are buffer-local and both take effect when logos-focus-mode is enabled. The former controls the indicate-buffer-boundaries while the latter determines whether the buffer should be put in a read-only mode.
  • Changed how user options are declared as buffer-local, by using the appropriate keyword of defcustom. Thanks to Philip Kaludercic for the patch, which was sent via email.
  • Wrote a node entry on how to write a regular expression that targets only specific Org heading levels. This pertains to user options logos-outlines-are-pages and logos-outline-regexp-alist.
  • Added keywords to the package metadata to help its discoverability.
  • Fixed typo in a function's doc string. Thanks to Remco van 't Veer

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