Commands like `add` and `files write` don't detect pipes on Windows

[mateon1]

Version information:

go-ipfs version: 0.4.4-dev-73cd8b3
Repo version: 4
System version: amd64/windows
Golang version: go1.7

Type: Bug

Priority: P3

Description:

As the title says, commands like ipfs add and ipfs files write don't detect whether they are being piped into on Windows.
This doesn't allow to add files into ipfs or mfs with a single step, as in echo text | ipfs add or echo text | ipfs files write /path/in/mfs.
(instead echo text > file; ipfs add file; ipfs files cp /ipfs/hash /path/in/mfs; rm file has to be used)

[Kubuxu]

Yes we have stdin piping explicitly disabled on windows, I don't know was is the reasoning behind it, but @whyrusleeping might know more about it.

[whyrusleeping]

I think i recall the reason for this had something to do with stdin being much more difficult to handle on windows than on linux.

Its explicitly disabled here: https://github.com/ipfs/go-ipfs/blob/master/commands/cli/parse.go#L258

@mateon1 feel free to experiment with that, if you find that everything works just fine, then please do PR a removal of that special casing.

[dysbulic]

A more descriptive error message would be useful, particularly because this affects the getting started tutorial.

Also, this is likely only necessary for the Windows console, since Cygwin's bash is from the same source as everyone elses'.

[whyrusleeping]

@dysbulic good point, we should check what shell we're in instead of just checking operating system here

[Kubuxu]

Cygwin console works by recompiling everything with linux'y libc and it is the reason why stdin is sane then but I have no idea how will Go stdin handling behave then if it isn't sane on Windows.

It seems to me that we have to rediscover the reason why stdin handling was disabled on Windows in the first place, maybe it can be re-enabled without any problems.

[whyrusleeping]

@Kubuxu I think the original reason it was disabled was because it didnt work properly on windows cmd.exe