[nongnu] elpa/focus cfb1672fca 76/82: Merge pull request #22 from larstvei/focus-face

[ELPA Syncer]

branch: elpa/focus
commit cfb1672fcad336ba9036cd71a99cdd150efe74e4
Merge: bf5fcff0d0 5e483363ac
Author: Lars Tveito <larstvei@ifi.uio.no>
Commit: GitHub <noreply@github.com>

    Merge pull request #22 from larstvei/focus-face
    
    Focus face
---
 README.md      |  43 ----------------------------
 README.org     |  87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 demo-dark.gif  | Bin 361222 -> 0 bytes
 demo-light.gif | Bin 285306 -> 0 bytes
 focus-demo.gif | Bin 0 -> 1827667 bytes
 focus.el       |  87 ++++++++++++++++++++-------------------------------------
 6 files changed, 118 insertions(+), 99 deletions(-)

diff --git a/README.md b/README.md
deleted file mode 100644
index 3cc53ad6ee..0000000000
--- a/README.md
+++ /dev/null
@@ -1,43 +0,0 @@
-[![MELPA](http://melpa.org/packages/focus-badge.svg)](http://melpa.org/#/focus)
-# Focus
-
-Focus provides `focus-mode` that dims the text of surrounding sections, 
similar to [iA Writer's](https://ia.net/writer) Focus Mode.
-
-## Installation
-
-You can install Focus using elpa. It's available on 
[melpa](http://melpa.milkbox.net/):
-
-<kbd> M-x package-install focus </kbd>
-
-The package has only been tried on Emacs 24.4 and 24.5, but should work on 
Emacs 24 or higher.
-
-## Usage
-
-Enable the `focus-mode` with <kbd> M-x focus-mode </kbd>.
-
-Also, `focus-read-only-mode` is provided, which is a mode optimized for 
continuous reading. It inhibits change in the buffer, hides the cursor and 
provides bindings for moving between *things* (defined in [Thing At 
Point](http://emacswiki.org/emacs/ThingAtPoint)). One can toggle 
`focus-read-only-mode` with <kbd> M-x focus-read-only-mode </kbd> or <kbd> C-c 
C-q </kbd> if `focus-mode` is enabled.
-
-Some bindings for simple navigation and exiting `focus-read-only-mode` are 
provided.
-
-Keybinding         | Description
--------------------|----------------------------
-<kbd> n </kbd>     | Jump to next *thing*
-<kbd> SPC </kbd>   | Jump to next *thing*
-<kbd> p </kbd>     | Jump to previous *thing*
-<kbd> S-SPC </kbd> | Jump to previous *thing*
-<kbd> i </kbd>     | Exit `focus-read-only-mode`
-<kbd> q </kbd>     | Exit `focus-read-only-mode`
-
-## Configuring
-
-The amount of dimness can be customized by setting the `focus-dimness` 
variable, where a positive integer indicates a more dim color (i.e. more 
blended with the background color of your theme), and a negative integer 
indicates a less dim color.
-
-Focus uses the [Thing At Point](http://emacswiki.org/emacs/ThingAtPoint) 
library to choose what section should be in focus. By default, modes derived 
from `prog-mode` uses `defun`, and modes derived from `text-mode` uses 
`sentence`. This a customizable by setting the `focus-mode-to-thing` variable, 
which is a list containing pairs on the form `(mode . thing)`.
-
-### Example
-
-This is what it looks like:
-
-Light Theme (leuven)                     |  Dark Theme (monokai)
-:---------------------------------------:|:---------------------------------------:
-<img src="./demo-light.gif" width="333"> | <img src="./demo-dark.gif" 
width="333">
diff --git a/README.org b/README.org
new file mode 100644
index 0000000000..5d39115d8f
--- /dev/null
+++ b/README.org
@@ -0,0 +1,87 @@
+[[https://melpa.org/#/focus][file:https://melpa.org/packages/focus-badge.svg]]
+[[https://stable.melpa.org/#/focus][file:https://stable.melpa.org/packages/focus-badge.svg]]
+
+* Focus
+
+  [[./focus-demo.gif]]
+
+  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.
+
+* Installation
+
+  It's available on [[https://melpa.org/#/focus][MELPA]] and 
[[https://stable.melpa.org/#/focus][MELPA Stable]]:
+
+  #+BEGIN_EXAMPLE
+  M-x package-install focus
+  #+END_EXAMPLE
+
+* Usage
+
+  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 [[https://www.emacswiki.org/emacs/ThingAtPoint][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.
+
+** Focus read-only mode
+
+   Enable ~focus-read-only-mode~ with ~M-x focus-read-only-mode~, which is
+   optimized for continuous reading. 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 | Description                 |
+   |------------+-----------------------------|
+   | ~n~        | 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~ |
+
+* Customization
+
+   The choice of what /thing/ is suitable for a mode may be configured by
+   setting the variable ~focus-mode-to-thing~. The default is
+
+   #+BEGIN_EXAMPLE
+   '((prog-mode . defun) (text-mode . sentence))
+   #+END_EXAMPLE
+
+   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:
+
+   #+BEGIN_SRC emacs-lisp
+   (add-to-list 'focus-mode-to-thing '(python-mode . paragraph))
+   #+END_SRC
+
+   changes ~python-mode~ to focus in on code-blocks with no blank lines rather
+   than the entire function.
+
+   According to 
[[https://www.reddit.com/r/emacs/comments/b1vrar/lsp_support_for_focusel_using_lspmode/][this
 reddit post]], Focus plays nice with ~lsp-mode~.
+
+** Faces
+
+   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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diff --git a/demo-light.gif b/demo-light.gif
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diff --git a/focus-demo.gif b/focus-demo.gif
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diff --git a/focus.el b/focus.el
index 58b6a9e508..82343d8731 100644
--- a/focus.el
+++ b/focus.el
@@ -38,17 +38,6 @@
   :group 'font-lock
   :prefix "focus-")
 
-(defcustom focus-dimness 0
-  "Amount of dimness in out of focus sections is determined by this integer.
-
-A positive value increases the dimness of the sections.
-A negative value decreases the dimness.
-
-The default is 0 which means a 50/50 mixture of the background
-and foreground color."
-  :type '(integer)
-  :group 'focus)
-
 (defcustom focus-mode-to-thing '((prog-mode . defun) (text-mode . sentence))
   "An associated list between mode and thing.
 
@@ -70,12 +59,18 @@ Things that are defined include `symbol', `list', `sexp',
   :type '(float)
   :group 'focus)
 
+(defface focus-unfocused
+  '((t :inherit font-lock-comment-face))
+  "The face that overlays the unfocused area."
+  :group 'focus)
+
+(defface focus-focused nil
+  "The face that overlays the focused area."
+  :group 'focus)
+
 (defvar focus-cursor-type cursor-type
   "Used to restore the users `cursor-type'")
 
-(defvar focus-dim-color nil
-  "Overrides the color used for dimmed text.")
-
 (defvar-local focus-current-thing nil
   "Overrides the choice of thing dictated by `focus-mode-to-thing' if set.")
 
@@ -85,6 +80,9 @@ Things that are defined include `symbol', `list', `sexp',
 (defvar-local focus-pre-overlay nil
   "The overlay that dims the text prior to the current-point.")
 
+(defvar-local focus-mid-overlay nil
+  "The overlay that surrounds the text of the current-point.")
+
 (defvar-local focus-post-overlay nil
   "The overlay that dims the text past the current-point.")
 
@@ -105,28 +103,6 @@ The timer calls `focus-read-only-hide-cursor' after
   "Return the current bounds, based on `focus-get-thing'."
   (bounds-of-thing-at-point (focus-get-thing)))
 
-(defun focus-average-colors (color &rest colors)
-  "Takes an average of the colors given by argument.
-Argument COLOR is a color name, and so are the COLORS; COLOR is
-there to ensure that the the function receives at least one
-argument."
-  (let* ((colors (cons color colors))
-         (colors (mapcar 'color-name-to-rgb colors))
-         (len    (length colors))
-         (sums   (apply 'cl-mapcar '+ colors))
-         (avg    (mapcar (lambda (v) (/ v len)) sums)))
-    (apply 'color-rgb-to-hex avg)))
-
-(defun focus-make-dim-color ()
-  "Return a dimmed color relative to the current theme."
-  (let ((background (face-attribute 'default :background))
-        (foreground (face-attribute 'default :foreground))
-        (backgrounds (if (> focus-dimness 0)    focus-dimness  1))
-        (foregrounds (if (< focus-dimness 0) (- focus-dimness) 1)))
-    (apply 'focus-average-colors
-           (append (make-list backgrounds background)
-                   (make-list foregrounds foreground)))))
-
 (defun focus-move-focus ()
   "Move the focused section according to `focus-bounds'.
 
@@ -138,35 +114,41 @@ command."
         (focus-move-overlays (car bounds) (cdr bounds))))))
 
 (defun focus-move-overlays (low high)
-  "Move `focus-pre-overlay' and `focus-post-overlay'."
-  (move-overlay focus-pre-overlay  (point-min) low)
+  "Move `focus-pre-overlay', `focus-mid-overlay' and `focus-post-overlay'."
+  (move-overlay focus-pre-overlay (point-min) low)
+  (move-overlay focus-mid-overlay low high)
   (move-overlay focus-post-overlay high (point-max)))
 
 (defun focus-init ()
   "This function is run when command `focus-mode' is enabled.
 
-It sets the `focus-pre-overlay' and `focus-post-overlay' to
-overlays; these are invisible until `focus-move-focus' is run. It
-adds `focus-move-focus' to `post-command-hook'."
+It sets the `focus-pre-overlay', `focus-min-overlay', and
+`focus-post-overlay' to overlays; these are invisible until
+`focus-move-focus' is run. It adds `focus-move-focus' to
+`post-command-hook'."
   (unless (or focus-pre-overlay focus-post-overlay)
     (setq focus-pre-overlay  (make-overlay (point-min) (point-min))
+          focus-mid-overlay  (make-overlay (point-min) (point-max))
           focus-post-overlay (make-overlay (point-max) (point-max))
           focus-buffer (current-buffer))
-    (let ((color (or focus-dim-color (focus-make-dim-color))))
-      (mapc (lambda (o) (overlay-put o 'face (cons 'foreground-color color)))
-            (list focus-pre-overlay focus-post-overlay)))
+    (overlay-put focus-mid-overlay 'face 'focus-focused-face)
+    (mapc (lambda (o) (overlay-put o 'face 'focus-unfocused-face))
+          (list focus-pre-overlay focus-post-overlay))
     (add-hook 'post-command-hook 'focus-move-focus nil t)
     (add-hook 'change-major-mode-hook 'focus-terminate nil t)))
 
 (defun focus-terminate ()
   "This function is run when command `focus-mode' is disabled.
 
-The overlays pointed to by `focus-pre-overlay' and `focus-post-overlay' are
-deleted, and `focus-move-focus' is removed from `post-command-hook'."
+The overlays pointed to by `focus-pre-overlay',
+`focus-mid-overlay' and `focus-post-overlay' are deleted, and
+`focus-move-focus' is removed from `post-command-hook'."
   (when (and focus-pre-overlay focus-post-overlay)
-    (mapc 'delete-overlay (list focus-pre-overlay focus-post-overlay))
+    (mapc 'delete-overlay
+          (list focus-pre-overlay focus-mid-overlay focus-post-overlay))
     (remove-hook 'post-command-hook 'focus-move-focus t)
-    (setq focus-pre-overlay  nil
+    (setq focus-pre-overlay nil
+          focus-mid-overlay nil
           focus-post-overlay nil)))
 
 (defun focus-goto-thing (bounds)
@@ -183,9 +165,7 @@ according to major-mode. If `focus-current-thing' is set, 
this
 default is overwritten. This function simply helps set the
 `focus-current-thing'."
   (interactive)
-  (let* ((candidates '(symbol list sexp defun
-                              filename url email word
-                              sentence whitespace line page))
+  (let* ((candidates '(defun line list paragraph sentence sexp symbol word))
          (thing (completing-read "Thing: " candidates)))
     (setq focus-current-thing (intern thing))))
 
@@ -276,11 +256,6 @@ It cleans up the `focus-read-only-blink-timer' and hooks."
   :keymap (let ((map (make-sparse-keymap)))
             (define-key map (kbd "C-c C-q") 'focus-read-only-mode)
             map)
-  (unless (or (and (color-defined-p (face-attribute 'default :background))
-                   (color-defined-p (face-attribute 'default :foreground)))
-              focus-dim-color)
-    (message "Can't enable focus mode when no theme is loaded. Try setting 
focus-dim-color!")
-    (setq focus-mode nil))
   (if focus-mode (focus-init) (focus-terminate)))
 
 ;;;###autoload