Stdin.readLine aborts when reading from a file

[busterwood]

Using bash to redirect Stdin from a file seems to fail.

Here is the simplest example test1.wren:

import "io" for Stdin, Stdout
var line = Stdin.readLine()
System.print("line: " + line)

When I run interactively it works:

chris@WIN-FE4HG5BFASB:~$ wren/wren test1.wren
fred
line: fred
chris@WIN-FE4HG5BFASB:~$

However, when I redirect stdin to read from a non-empty file it fails:

chris@WIN-FE4HG5BFASB:~$ wren/wren test1.wren < sales.txt
Aborted
chris@WIN-FE4HG5BFASB:~$ head sales.txt
--
-- PostgreSQL database dump
--

-- Dumped from database version 11.5
-- Dumped by pg_dump version 11.5 (Debian 11.5-3.pgdg80+1)

SET statement_timeout = 0;
SET lock_timeout = 0;
SET idle_in_transaction_session_timeout = 0;

Using Ubuntu on WSL 2 on Windows 10.

[mhermier]

Digged into this and there is no solutions for this for now. Redirections like these results in UV_FILE type. Current implementation tried to mitigate the issue by making it behave like UV_PIPE, but uv_pipe_init check and fails on UV_FILE. And the deep reason this fails is because of epoll not supporting plain files descriptor.

[joshgoebel]

Redirections like these

Like which? Are there other redirections that do work?

---

I'm on Mac OS and both 0.3.0 and latest main work just fine for me when piping or redirecting a file (using provided examples). Is this a Windows or platform specific issue? Or perhaps the UV version has been bumped since this was opened and the behavior I'm seeing is new?

[joshgoebel]

@busterwood Could you confirm if this is still an issue with the latest code in main and let us know which platform you're seeing the issue on?