**Shae Erisson** @shapr@recurse.social · Sep 26, 2024, 11:56

**Shae Erisson** @shapr@recurse.social · Sep 26, 2024, 11:56

Shae Erisson @shapr@recurse.social

I want to read from stdin with #haskell and I want to use Data.Text.IO (getLine)

How do I process each line and then detect when to stop?

Can I use System.IO (isEOF) as I would when reading String via System.IO (getLine) ?

**l'empathie mécanique** @dpwiz@qoto.org · Sep 26, 2024, 12:06

**l'empathie mécanique** @dpwiz@qoto.org · Sep 26, 2024, 12:06

l'empathie mécanique @dpwiz@qoto.org

How about `lines <$> getContents`?

**Shae Erisson** @shapr@recurse.social · Sep 26, 2024, 12:21

**Shae Erisson** @shapr@recurse.social · Sep 26, 2024, 12:21

Shae Erisson @shapr@recurse.social

@dpwiz will that be lazy and allow me to process line by line to minimize memory?
Each line of input has one chunk I can process.

Also, I don't have a notification for this reply, only noticed it accidentally. I wonder why?

**l'empathie mécanique** @dpwiz@qoto.org · 2024-09-26T13:07:34Z

l'empathie mécanique @dpwiz@qoto.org

@shapr It will be demand-driven. Whenever the next line is required for processing it will read it from a buffer, block until there's input, or stop.

It shouldn't retain previous lines unless you keep references to them somewhere.