This is Focus, a package that dims surrounding text. It works with any theme and can be configured to focus in on different regions like sentences, paragraphs or code-blocks.
It’s available on MELPA and MELPA Stable:
M-x package-install focus
Enable focus-mode with M-x focus-mode.
A few interactive functions are provided:
Function Description
focus-change-thing Adjust the narrowness of the focused section for the current buffer focus-pin Pin the focused section to its current location or the region, if active focus-unpin Unpin the focused section focus-next-thing Move the point to the middle of the Nth next thing focus-prev-thing Move the point to the middle of the Nth previous thing
Focus relies on Thing At Point, which can retrieve a thing surrounding the point. These things may be a symbol, list, S-expression (sexp), function definition (defun), sentence, line, page and others. Calling M-x focus-change-thing allows you to interactively change the kind of region which should be in focus.
Enable focus-read-only-mode with M-x focus-read-only-mode. It inhibits changes in a buffer, hides the cursor and provides bindings for moving between things.
Some bindings for simple navigation and exiting `focus-read-only-mode` are provided.
Keybinding Descriptionn Jump to next thing SPC Jump to next thing p Jump to previous thing S-SPC Jump to previous thing i Exit focus-read-only-mode q Exit focus-read-only-mode
The choice of what thing is suitable for a mode may be configured by setting the variable focus-mode-to-thing. The default is
'((prog-mode . defun) (text-mode . sentence))
For modes inheriting prog-mode (which are most programming modes), the default is the function-body, and for modes inheriting text-mode, the default is a sentence.
For instance, adding the following to your .emacs-file:
(add-to-list 'focus-mode-to-thing '(python-mode . paragraph))
changes python-mode to focus in on code-blocks with no blank lines rather than the entire function.
According to this reddit post, Focus plays nice with lsp-mode.
Focus offers two faces, one for the focused- and unfocused area. By default, the focus-focused is the empty face, meaning there is no change, and focus-unfocused inherits the comment face (which is usually subtle). The faces can easily be customized via M-x list-faces-display.
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