use spacebar to expand/collaspe nodes

README.md

@@ -30,7 +30,7 @@ $ tson -url http://gorilla/likes/json
 ### JSON tree
 
 | key    | description                    |
-|--------|----------------------|
+|--------|--------------------------------|
 | j      | move down                      |
 | k      | move up                        |
 | g      | move to the top                |
@@ -49,6 +49,8 @@ $ tson -url http://gorilla/likes/json
 | Enter  | edit node                      |
 | /      | search nodes                   |
 | ?      | show helps                     |
+| space  | expand/collaspe children nodes |
+| ctrl-c | exit tson                      |
 
 ### help
 | key    | description        |

gui/tree.go

@@ -151,6 +151,9 @@ func (t *Tree) SetKeybindings(g *Gui) {
 			g.AddValue()
 		case '?':
 			g.NaviPanel()
+		case ' ':
+			current := t.GetCurrentNode()
+			current.SetExpanded(!current.IsExpanded())
 		}
 
 		return event