X-Recipient:	archive-cygwin AT delorie DOT com
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DMARC-Filter:	OpenDMARC Filter v1.4.1 sourceware.org 697A7385AE5F
Authentication-Results:	sourceware.org;
	dmarc=fail (p=none dis=none) header.from=nifty.ne.jp
Authentication-Results:	sourceware.org; spf=fail smtp.mailfrom=nifty.ne.jp
DKIM-Filter:	OpenDKIM Filter v2.10.3 conssluserg-05.nifty.com 25EAlqN5001841
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.ne.jp;
	s=dec2015msa; t=1655203672;
	bh=cquaJOBn6bDYFiLDul7piWdZcwx7H76SVYD9+a+MC1Q=;
	h=Date:From:To:Cc:Subject:In-Reply-To:References:From;
	b=caGQcndz/Lzo8DAjWz/0K9LjmUJtlR3knygfpdUmy8KF/T42CSMorXPkC/FTGHIKY
	RwHzUq/+Zd4mQbV8sxordMzsmIOQMg1e0TjqkZ1DgUnwvUOPv4DvvVygLek8V9ZmaX
	AGrIlzNtktxKKRRzu2VyZNkpVzQCRYJ0s6uSaEqXZNZTL86+rwI1EGvno5LcRX7BQm
	YYyVK3s/WTi//7o1GhlBj1i3TxHCWRGbNEjyYhtIfcZSsSqXJxzXlFHFpf7c3zhI4k
	XD5f+CwF8Vph66W2kAqRf3U5yM4Btjj/DaObx8yROOMQv7xhUGO6CsaP6yI5M4G+qh
	y+l+RcJ+h8RwA==
X-Nifty-SrcIP:	[119.150.44.95]
Date:	Tue, 14 Jun 2022 19:47:53 +0900
From:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To:	cygwin AT cygwin DOT com
Subject:	Re: "cat" breaks ANSI codes on Windows Terminal when piping stdout
	to python or golang
Message-Id:	<20220614194753.e06a3ff4e6be224249956e50@nifty.ne.jp>
In-Reply-To:	<1qctAGvnk1sjfU-ob9Y_DTSQIMpPGIn6lDmSoU0JKGPa_EDZkIMYP65gYufkeEVyPX0WCmJDQAJAmGf13IpPPHUmmchN17WDX4PyRxt2omE=@protonmail.com>
References:	<1qctAGvnk1sjfU-ob9Y_DTSQIMpPGIn6lDmSoU0JKGPa_EDZkIMYP65gYufkeEVyPX0WCmJDQAJAmGf13IpPPHUmmchN17WDX4PyRxt2omE=@protonmail.com>
X-Mailer:	Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version:	1.0
X-Spam-Status:	No, score=-5.3 required=5.0 tests=BAYES_00, DKIM_SIGNED,
	DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_NONE,
	SPF_HELO_NONE, SPF_PASS, TXREP,
	T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version:	SpamAssassin 3.4.6 (2021-04-09) on
	server2.sourceware.org
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.29
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
Errors-To:	cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Tue, 14 Jun 2022 08:01:45 +0000
5990 via Cygwin wrote:
> ## Bug:
> Piping the standard output of cat into the standard input of golang or python, makes the Windows Terminal render ANSI codes as arrows.
> 
> For example:
> `\033[36m` turns into `$B"+(B[36m` (or in base64'd UNICODE: `4oaQWzM2bQ==`)
> 
> ## Environment:
> - cat v8.26
> - Windows Terminal v1.12.10982.0
> - golang version go1.17.2 windows/amd64
> - python v3.7.7
> 
> colors.go
> ```
> package main
> 
> import "fmt"
> 
> const colorReset = "\033[0m"
> const colorCyan = "\033[36m"
> 
> func main(){
>   fmt.Print(string(colorCyan) + "golang-test" + string(colorReset) + "\n")
> }
> ```
> 
> 
> color.py
> ```
> from lolpython import lol_py
> 
> lol_py("python-test")
> ```
> 
> 
> domains.txt is an empty file (from my testing, the contents of domains.txt do not affect this bug)
> 
> ## What works:
> The following commands will successfuly output in cyan color
> `go run color.go`
> `go build color.go && color.exe`
> `go build color.go && cat domains.txt | color.exe`
> `go build color.go && echo a | color.exe`
> `go build color.go && type domains.txt | color.exe`
> `py -3.7 color.py`
> 
> ## What triggers the bug:
> `cat domains.txt | go run color.go`
> OUTPUT: `$B"+(B[36mgolang-test$B"+(B[0m`
> 
> `cat domains.txt | py -3.7 color.py`
> OUTPUT: `$B"+(B[38;2;128;237;18mp$B"+(B[0m$B"+(B[38;2;139;231;12my$B"+(B[0m$B"+(B[38;2;150;225;8mt$B"+(B[0m$B"+(B[38;2;161;217;5mh$B"+(B[0m$B"+(B[38;2;172;209;2mo$B"+(B[0m$B"+(B[38;2;182;200;1mn$B"+(B[0m$B"+(B[38;2;192;190;1m-$B"+(B[0m$B"+(B[38;2;201;180;1mt$B"+(B[0m$B"+(B[38;2;210;170;3me$B"+(B[0m$B"+(B[38;2;218;159;5ms$B"+(B[0m$B"+(B[38;2;226;148;9mt$B"+(B[0m`
> 
> Strangely enough, golang compiled executables work perfectly, but piping `cat domains.txt | go run color.go` does not work.
> The workaround I had to go with is to use Windows's built-in `type` command instead of `cat`. This was a tricky bug to track-down so I hope this report helps hahah

I cannot reproduce your problem.

My environment is:
cygwin 3.3.5
cat 8.32
Windows Terminal 1.13.11431.0
go version go1.18.3 windows/amd64

What shell did you use? cygwin bash? cmd.exe? powershell?

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -