Add Swapping Split Windows as a vim til.

README.md

@@ -214,6 +214,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Set Your Color Scheme](vim/set-your-color-scheme.md)
 - [Split Different](vim/split-different.md)
 - [Swap Occurrences Of Two Words](vim/swap-occurrences-of-two-words.md)
+- [Swapping Split Windows](vim/swapping-split-windows.md)
 - [Tabs To Spaces](vim/tabs-to-spaces.md)
 - [The Vim Info File](vim/the-vim-info-file.md)
 - [Verbose Commits With Fugitive](vim/verbose-commits-with-fugitive.md)

vim/swapping-split-windows.md

@@ -0,0 +1,14 @@
+# Swapping Split Windows
+
+Consider a scenario where you have a vim window that has been split
+horizontally into two viewports. You'd prefer the top one to be on bottom
+and the bottom one to be on top. You want to swap them.
+
+If you are currently focused on the top viewport, then tell vim to move that
+viewport down with `CTRL-w J`. As you might guess, moving the bottom
+viewport up can be done with `CTRL-w K`. `J` and `K` mean down and up in
+other contexts; vim is consistent with their meaning here.
+
+Viewports of a vertical split can be swapped in the same sort of way. Use
+`CTRL-w L` to move the left viewport to the right. Use `CTRL-w H` to move
+the right viewport to the left.