Implementing a selections and other things

[gibiansky]

This is a pretty big change (almost a rewrite), so no pressure to merge it. Feel free to test it and find edge cases where it doesn't work, in which case I can fix them. (If you use Vundle, you can just use Plugin 'gibiansky/vim-textobj-haskell' to do so.)

[gilligan]

There seem to be some issues still:

-- this is a comment
foobar [] = 42
foobar (x:xs) = x 

1. vih or vah on the first line (comment) select the comment. Correct behavior would be no selection at all. In general leading or trailing comment lines should be ignored and only comments in between statements should be included.
2. vah on the second line selects the first and second line. Correct behavior would be second and third line.
3. vah on the third line selects the third line only. Correct behavior would again be to select lines 2-3.

-- this is a comment
foobar :: IO ()
foobar = do
    let x = "test1"
    let y = "test2"

    putStrLn x
    putStrLn y

1. vah crashes with an index out of bounds exception. It works if I remove the type signature (vih works though).

Can you have a look at those issues ?

[gibiansky]

Yup, I'll take a look. Although for (1), that is purposeful – I definitely think selecting comments should be possible. There are times when I wish to reformat those! (Such as keeping them within 80 or 100 characters.)

[gilligan]

Adding preliminary support for this was rather quick, did it in the select-a branch. It does need some cleaning up though. Still interested to see a fixed version of your fork though.