Update post

docs/_posts/2018-01-23-grep-on-the-fly-in-spacevim.md

@@ -12,20 +12,58 @@ asynchronously. before using this feature, you need to install a searching tool.
 interfaced with different searching tools like: `ag`, `rg`, `ack`, `pt` and `grep`, select any one
 you like.
 
-With this feature, you can:
+![grep in current project](https://user-images.githubusercontent.com/13142418/35276219-4aa9f9c0-0008-11e8-8d3c-7bf57f60a88e.gif)
+
+This ia a build-in plugin in SpaceVim, and we also split a plugin : [FlyGrep.vim](https://github.com/wsdjeg/FlyGrep.vim)
+
+## Features
 
 - Searching in current file
+
+You can use `SPC s s` to searching in current file. To searching word under the cursor, you may need to press `SPC s S`.
+
 - Searching in all loaded buffers
+
+To searching in all loaded buffers, you need to press `SPC s b`, and you can also use `SPC s B` to search word under the point.
+
 - Searching in an arbitrary directory
+
+If you want to searching in a different directory instead of current directory, you can use `SPC s f`.
+
 - Searching in a project
+
+In SpaceVim, you can use `SPC s p` or `SPC s /` to searching in current project.
+
 - Background searching in a project
 
-## Searching in current file
+## Key bindings
 
+The search commands in SpaceVim are organized under the `SPC s` prefix with the next key is the tool to use and the last key is the scope. For instance `SPC s a b` will search in all opened buffers using `ag`.
 
+If the last key (determining the scope) is uppercase then the current word under the cursor is used as default input for the search. For instance `SPC s a B` will search with word under cursor.
 
+If the tool key is omitted then a default tool will be automatically selected for the search. This tool corresponds to the first tool found on the system of the list `g:spacevim_search_tools`, the default order is `rg`, `ag`, `pt`, `ack` then `grep`. For instance `SPC s b` will search in the opened buffers using `pt` if `rg` and `ag` have not been found on the system.
 
-## Searching in all loaded buffers
-## Searching in an arbitrary directory
-## Searching in a project
-## Background searching in a project
+The tool keys are:
+
+| Tool | Key |
+| ---- | --- |
+| ag   | a   |
+| grep | g   |
+| ack  | k   |
+| rg   | r   |
+| pt   | t   |
+
+The available scopes and corresponding keys are:
+
+| Scope                      | Key |
+| -------------------------- | --- |
+| opened buffers             | b   |
+| files in a given directory | f   |
+| current project            | p   |
+
+**Within FlyGrep buffer:**
+
+| key bindings | description |
+| ------------ | ----------- |
+| `<TAb>`      | next result |