#+TITLE: Rebox layer

* Table of Contents                                         :TOC_4_gh:noexport:
- [[#description][Description]]
  - [[#features][Features]]
- [[#install][Install]]
  - [[#layer][Layer]]
  - [[#configuration][Configuration]]
    - [[#styles-cycling][Styles cycling]]
    - [[#text-mode][Text mode]]
- [[#style-templates][Style Templates]]
  - [[#standard-packaged-templates][Standard packaged templates]]
    - [[#comments][Comments]]
  - [[#additional-templates][Additional Templates]]
- [[#key-bindings][Key bindings]]

* Description
This layer adds support for [[https://github.com/lewang/rebox2][rebox2]] package which is a minor-mode allowing
to easily add ASCII text boxes to a buffer.

A nice video demonstration by the package author can be found [[https://www.youtube.com/watch?v=53YeTdVtDkU][here]].

** Features
- Auto-wrap correctly in comments,
- Auto-fill correctly in comments,
- Boxes auto-adapt as text is inserted or deleted,
- ~S-RET~ to continue a comment on the next line,
- Kill/yank within the box,
- Apparently works well with ancient =filladpt-mode= (see authors video).

* Install
** Layer
To use this configuration layer, add it to your =~/.spacemacs=. You will need to
add =rebox= to the existing =dotspacemacs-configuration-layers= list in this
file.

** Configuration
*** Styles cycling
Box styles are identified by numbers, it is possible to cycle through a list
of styles using ~SPC x b n~. This list can be customized by setting the variable
=rebox-style-loop=.

#+BEGIN_SRC emacs-lisp
(setq rebox-style-loop '(71 72 73))
#+END_SRC

*** Text mode
As text mode usage could surprise some users (e.g., when they enter M-q to fill
a paragraph) =rebox= is not enabled by default in =text-mode=. To enable it you
need to set the layer variable =rebox-enable-in-text-mode= to =t=.

#+begin_src emacs-lisp
(setq-default dotspacemacs-configuration-layers '(
    (rebox :variables rebox-enable-in-text-mode t)))
#+end_src

* Style Templates
** Standard packaged templates
You can find the full list of templates in
[[https://github.com/lewang/rebox2/blob/master/rebox2.el]["Box templates" section of =rebox2.el=]]

*** Comments
These templates are single line comments styles. A =#= is used here for
illustration; however, it will work equally well if the comment character is
different (e.g., lisp's =;= comment character).

** Additional Templates
These templates are added by the Spacemacs layer.

#+begin_src sh
  #
  # box style 71
  #

  # ------------
  # box style 72
  # ------------

  # ============
  # box style 73
  # ============

  #--------------
  # box style 74
  #--------------

  #--------------+
  # box style 75
  #--------------+

  #==============
  # box style 76
  #==============

  ##
  ## box style 81
  ##

  ## ------------
  ## box style 82
  ## ------------

  ## ============
  ## box style 83
  ## ============

  ##--------------
  ## box style 84
  ##--------------

  ##--------------+
  ## box style 85
  ##--------------+

  ##==============
  ## box style 86
  ##==============
#+end_src

* Key bindings
*Note:* Use a numerical prefix argument to choose a specific style for instance
~86 SPC x b b~ to use the style 86 above.

| Keybinding  | Command                                                           |
|-------------+-------------------------------------------------------------------|
| ~SPC x b >~ | Move box to the right (point must be around left side of the box) |
| ~SPC x b <~ | Move box to the left (point must be around left side of the box)  |
| ~SPC x b b~ | Draw next box defined in =rebox-style-loop=                       |
| ~SPC x b B~ | Draw previous box defined in =rebox-style-loop=                   |
| ~SPC x b c~ | Center box (point must be around left side of the box)            |
| ~S-RET~     | rebox-indent-new-line                                             |