#+TITLE: Version-Control layer

* Table of Contents                                         :TOC_4_gh:noexport:
- [[#description][Description]]
  - [[#features][Features]]
- [[#install][Install]]
  - [[#layer][Layer]]
- [[#configuration][Configuration]]
  - [[#differences-between-margin-programs][Differences between margin programs]]
- [[#key-bindings][Key Bindings]]
  - [[#version-control-transient-state][Version Control Transient-state]]
  - [[#smerge-mode-transient-state][Smerge Mode Transient-state]]

* Description
This layers adds general configuration for [[http://www.gnu.org/software/emacs/manual/html_node/emacs/Version-Control.html][Emacs VC]].
It should work with all VC backends such as Git, Mercurial, Bazaar, SVN, etc...

** Features
- highlights uncommitted changes in the fringe or margin with [[https://github.com/dgutov/diff-hl][diff-hl]],
git-gutter, or git-gutter+
- adds vcs transient-state ~SPC g.~ to allow quick navigation and modification of
buffer hunks.

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

* Configuration
You can choose the package to facilitate the diff transient-state and show margins
by setting =version-control-diff-tool=

#+BEGIN_SRC emacs-lisp
'(version-control :variables
                  version-control-diff-tool 'diff-hl)
#+END_SRC

You can choose the side on which the diff appears (by default it's the right side)

#+BEGIN_SRC emacs-lisp
'(version-control :variables
                  version-control-diff-side 'left)
#+END_SRC

To automatically enable diff margins in all buffers, set
=version-control-global-margin=

#+BEGIN_SRC emacs-lisp
'(version-control :variables
                  version-control-global-margin t)
#+END_SRC

** Differences between margin programs
This layer contains generalized mappings for three diff margin packages:
diff-hl, git-gutter, and git-gutter+.

There are some differences between packages that might have some people prefer
one over the other:

| Feature                             | diff-hl | git-gutter | git-gutter+ |
|-------------------------------------+---------+------------+-------------|
| Show in fringe                      | X       | X          | X           |
| Extended VCS support (e.g. hg, svn) | X       | X          |             |
| Stage hunks from buffer             |         | X          | X           |
| Dired support                       | X       |            |             |

* Key Bindings

| Key Binding | Description                     |
|-------------+---------------------------------|
| ~SPC g .~   | version control transient-state |
| ~SPC g r~   | smerge mode transient-state     |
| ~SPC T d~   | toggle diff margins             |
| ~SPC T C-d~ | toggle diff margins globally    |
| ~SPC g h o~ | browser at remote               |

** Version Control Transient-state

| Key Binding | Description                  |
|-------------+------------------------------|
| ~SPC g . h~ | Show diff of hunk            |
| ~SPC g . n~ | Next hunk                    |
| ~SPC g . N~ | Previous hunk                |
| ~SPC g . p~ | Previous hunk                |
| ~SPC g . r~ | Revert hunk                  |
| ~SPC g . s~ | Stage hunk                   |
| ~SPC g . t~ | Toggle margin indicators     |
| ~SPC g . w~ | Stage file                   |
| ~SPC g . u~ | Unstage file                 |
| ~SPC g . d~ | Repo diff popup              |
| ~SPC g . D~ | Show diffs of unstaged hunks |
| ~SPC g . c~ | Commit with popup            |
| ~SPC g . C~ | Commit                       |
| ~SPC g . P~ | Push repo with popup         |
| ~SPC g . f~ | Fetch for repo with popup    |
| ~SPC g . F~ | Pull repo with popup         |
| ~SPC g . l~ | Show repo log                |

** Smerge Mode Transient-state

| Key Binding | Description              |
|-------------+--------------------------|
| ~SPC g r n~ | Next hunk                |
| ~SPC g r N~ | Previous hunk            |
| ~SPC g r p~ | Previous hunk            |
| ~SPC g r j~ | Go to next line          |
| ~SPC g r k~ | Go to previous line      |
| ~SPC g r b~ | Smerge keep base         |
| ~SPC g r m~ | Smerge keep mine         |
| ~SPC g r a~ | Smerge keep all          |
| ~SPC g r o~ | Smerge keep other        |
| ~SPC g r c~ | Smerge keep current      |
| ~SPC g r C~ | Smerge combine with next |
| ~SPC g r u~ | Undo                     |
| ~SPC g r r~ | Smerge refine            |
| ~SPC g r q~ | Quit transient state     |