Support a "fixed" size constraint that corresponds to the size of Image

[iogrt]

Why

Current options make it so that rendering fixed size TUI images requires us to know the size they'll take up.

It seems to me that it's possible to compute this size by using imageHeight and imageWidth from vty.

I believe this is how brick does it.

Proposed solution:

Add Constraint_Fit and corresponding fit function.

[iogrt]

I believe I was almost able to implement this:

sizeOfRegion o imgs =
  fmap Constraint_Fixed
    <$> mapDynM
      ( \r -> do
          a <- sample imgs
          let direction = (if r == Orientation_Column then V.imageHeight else V.imageWidth)
          pure $
            foldr
              ( \y x ->
                  direction y + x
              )
              0
              a
      )
      o

fit child = do
  ori <- askOrientation
  (_, images) <- listenImages child
  c <- sizeOfRegion ori images
  grout c child

listenImages being an listen implementation for the ImageWriter
Unfortunately this hangs. I believe it's due to the fact that I'm samping the Behavior t [Image]. Is there any way I could get around?

[ali-abrar]

Making sure I understand: is the idea here to do something like fixed but having the size part of the constraint computed by the actual size of the child?

[iogrt]

yes exactly