Windows: piping seems broken

[anki-code]

Originally posted by @guraltsev in #5150 (comment):

Part 1. Piping

Piping seems broken in general. For example:

echo "hello" |  C:\Programs.global\msys2\app.noinstall\ucrt64\bin\cat.exe

freezes in xonsh but

echo "hello" | C:\\Programs.global\\msys2\\app.noinstall\\ucrt64\\bin\\cat.exe

works normally under git-bash for windows or msys bash

Part 2. Piping from unthreadable alias

#5317 (comment)

For community

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[Spitfire1900]

Not reproducing using Git for Windows.

XXXXXX ~ [1] @ where cat.exe
C:\Program Files\Git\usr\bin\cat.exe
XXXXXX ~ @ echo 'hello' | cat.exe
hello

[Spitfire1900]

I've reproduced a hang on xonfig info -j | cat in Ubuntu 22.04.3

[Spitfire1900]

The following seems to be a workaround

_ = $(xonfig info -j); echo @(_) | jq .

[anki-code]

From another thread. Reported by guraltsev:

I am having the same exact problem and specifically with jq! I tried it with the python from msys2 with ucrt64 as well as with the standard windows python (3.11.7 and 3.12.1). In both cases jq hangs from the command:

echo "{\"a\":2}"  |  jq .

but works perfectly if one does

echo "{\"a\":2}"  > test
jq . test

Also, the same problem happens if one does

echo "{\"a\":2}"  > test
cat test | jq . 

However

tail test | jq .

works ok!

The problem, I believe, is that both cat and echo are xonsh commands while tail is a "true" executable.

The problem seems to lie in the piping logic of xonsh

[anki-code]

Reported Awpteamoose:

history | grep foo outputs matches and then hangs on Windows, regardless of whether there actually were matches or not. I'm using wt.exe for terminal, xonsh --no-rc and GNU grep for Windows (in PATH). Other things like cat foo | grep bar work fine.