remove Windows output translation

[slingamn]

According to https://github.com/jwalton/go-supportscolor the technique here is valid on all supported versions of Windows.

Without this change, 256-color ANSI codes will panic. For example, 48; sets a background color from the 256-color palette and causes an out-of-bounds read here:

readline/ansi_windows.go

Line 164 in 7f93d88

color |= ColorTableBg[c-40]

goroutine 14 [running]:
github.com/chzyer/readline.(*ANSIWriterCtx).ioloopEscSeq(0xc0000243c0?, 0xfe6142?, 0x6d, 0xc00001ef98)
        /redacted/ircdog/vendor/github.com/chzyer/readline/ansi_windows.go:164 +0x66f
github.com/chzyer/readline.(*ANSIWriterCtx).process(0xc00001ef90, 0x1b?)
        /redacted/ircdog/vendor/github.com/chzyer/readline/ansi_windows.go:99 +0xcf
github.com/chzyer/readline.(*ANSIWriter).Write(0xc00001efc0, {0xc000018640, 0xad, 0x140})
        /redacted/ircdog/vendor/github.com/chzyer/readline/ansi_windows.go:207 +0xdf
github.com/chzyer/readline.(*wrapWriter).Write.func1()
        /redacted/ircdog/vendor/github.com/chzyer/readline/operation.go:57 +0x44
github.com/chzyer/readline.(*RuneBuffer).Refresh(0xc000155cc0, 0xc00017bd40)
        /redacted/ircdog/vendor/github.com/chzyer/readline/runebuf.go:463 +0xd8
github.com/chzyer/readline.(*wrapWriter).Write(0xc00017bdb0, {0xc000018640?, 0xded668?, 0xc000021110?})
        /redacted/ircdog/vendor/github.com/chzyer/readline/operation.go:56 +0xa7
github.com/chzyer/readline.(*Instance).Write(0xc000021110?, {0xc000018640, 0xad, 0x140})
        /redacted/ircdog/vendor/github.com/chzyer/readline/readline.go:298 +0x85
fmt.Fprintln({0x1114660, 0xc000008378}, {0xc00017bef8, 0x1, 0x1})
        /usr/local/go/src/fmt/print.go:305 +0x75
main.connectExternal.func2()
        /redacted/ircdog/ircdog.go:303 +0x305
created by main.connectExternal
        /redacted/ircdog/ircdog.go:284 +0x2d9

Thanks very much for your time.

[wader]

Nice cleanup 👍 by "all supported versions of windows" you mean all version of windows supported by microsoft or golang?

[slingamn]

By Microsoft, sorry. Go still supports Windows 7: golang/go#57003

[wader]

I see, thanks! some users of https://github.com/wader/fq seem to have some ANSI related issues on windows, for example underline with colored text somehow ends up changing the background color. I don't know much about windows or windows terminal so i'm bit lost :)

[wader]

btw fq uses this readline fork https://github.com/wader/readline that has a bunch of fixes, maybe interesting

[wader]

Did some testing with fq with these changes, seems to work fine. Do you know if ANSI colors are natively support in the "old" cmd.exe also? i tested using virtualbox and image from https://developer.microsoft.com/en-us/windows/downloads/virtual-machines/

[slingamn]

Yep, I tested with Windows 10 22H2 on metal in both PowerShell and cmd.exe. Both aspects of this patch (ANSI output rendering and input processing) are fully functional in both contexts.

FWIW I'm still working on contacting chzyer and putting together a fork.

[wader]

@slingamn Great 👍 let us know how it goes

[NCLnclNCL]

By Microsoft, sorry. Go still supports Windows 7: golang/go#57003

No, it end support

[slingamn]

@NCLnclNCL technically it is still supported as long as Go 1.20 is supported, i.e. until Go 1.22 is released :-)