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This function deletes all the characters between the cursor and the
given position.

This also properly marks the start and end of undo groups in order to
properly support undoing and redoing commands with counts and insert
commands.

This is necessary to support proper undoing in insert mode.

This command repeats the last normal command or the last insert
command. It also supports counts.

This will repeat the last insert `count` times.

This will be used later. Right now we just properly track the count.

This includes support for basic vi movements and insert and normal mode.

This release includes support for detecting Esc key presses.

This is necessary for vi normal mode.

This code should be shared across all key mappings.

It is now unused.

Right now this is just a simple passthrough to Editor, but this will
change.

This was done by splitting the key handling loop out of read_line.
Eventually this will be made into a generic function that can accept
any type of Editor.

Eventually this will be replaced by an emacs specific key mapper and
all key handling will be removed from Editor. We need this
implementation to aid in the transition though.

The intention is for this class to wrap an instance of Editor and call
into it to modify the buffer according to the user's key presses. This
way editing operations and key presses are decoupled.

This will be used by vi mode.

support undo/redo with truncate

Prior to this patch, typing some text, moving to the start of the line,
then deleting until the end of the line and attempting to undo will
cause a panic. This is because the truncate() operation did not update
the undo list. This has been corrected.

When testing on travis, the terminal width is returned as 0 which leads
to a divide-by-zero error. Hardcoding the size when testing avoids this
issue.

fix must_use warning in example

add some tests to editor