Robbie Vanbrabant 26a3b42a15 LibGUI: Add visual line mode to VimEditingEngine ...

Applications using the Vim emulation engine now support line-wise text
selection.

We already have support for character-wise text selection, by pressing
`v` from normal mode.

However now can also trigger line-wise text selection by pressing
`shift+v` from normal mode, and then using vertical motion commands
(e.g. `j` or `k`) to expand the selection. This is a standard vim
feature.

In visual line mode the following operations are supported:

  * `escape`: back to normal mode
  * `u`: convert to lowercase
  * `U`: convert to uppercase
  * `~`: toggle case
  * `ctrl+d`: move down by 50% of page height
  * `ctrl+u`: move up by 50% of page height
  * `d` or `x`: delete selection
  * `c`: change selection
  * `y`: copy selection
  * `page up`: move up by 100% of page height
  * `page down`: move down by 100% of page height

Notably I didn't implement pressing `v` to go to regular
(character-wise) visual mode straight from visual line mode. This is
tricky to implement in the current code base, and there's an
alternative, which is to take a detour via normal mode.

2022-08-26 12:50:30 +02:00

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