BUG pretty not working on Windows: "invalid character" #242

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1. turbotimon

   changed the title [-]BUG pretty not working on windows "invalid character"[/-] [+]BUG pretty not working on Windows: "invalid character"[/+] on May 11, 2023
2. sjakobi commented on May 11, 2023

   

   sjakobi

   on May 11, 2023

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   What happens if you just input "hello λ"?

   Did you configure your terminal to use UTF-8?
3. turbotimon commented on May 15, 2023

   

   turbotimon

   on May 15, 2023

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   I looks like UTF-8 generally work in PS and CMD. In GHCI it get's escaped (but no error):

   PS C:\Users\user> "hello ?"
   hello λ
   PS C:\Users\user> ghci
   GHCi, version 9.2.5: https://www.haskell.org/ghc/  :? for help
   ghci> "hello λ"
   "hello \955"

   I know other people having this issue on windows, it therefore seems not to be a isolated problem with my system.
4. turbotimon commented on May 31, 2023

   

   turbotimon

   on May 31, 2023

   Last edited by turbotimon

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   I found a workaround by changing the codepage of the PowerShell or cmd.exe: chcp 65001

   (this link may be also useful)
5. das-g commented on May 31, 2023

   

   das-g

   on May 31, 2023

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   Here seems to be workaround that can probably be implemented in programs and libraries (rather than by the end user).

   👍React with 👍1Reacted by Timon Erhart
6. sjakobi commented on Nov 30, 2025

   

   sjakobi

   on Nov 30, 2025

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   I'm not sure that prettyprinter should try to set encodings on Windows.

   Maybe we can add a bit of documentation about this though. Where would you expect to find it?
7. turbotimon commented on Dec 1, 2025

   

   turbotimon

   on Dec 1, 2025

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   Probably on the main page / readme?