how to read console input about shelljs

[nfischer]

Sounds like we should implement a read() function similar to Bash's read. If anyone can open a PR, I'll gladly review

[pfraces]

@nfischer I want to read from stdin synchronously. I was expecting that cat called without filepaths would do it.

Since I haven't found a way to do it with shelljs I have used a stackoverflow snippet showing a cross-platform way of reading stdin synchronously.

Would you be interested in a PR for making cat reading from stdin when called without arguments?

[pfraces]

@nfischer I've started working on this and I've realized that cat can be piped like in pwd().cat() so in order to keep that functionality I propose to use - as filepath to specify standard input instead of the absence of filepaths

cat('file1.txt', '-', 'file2.txt')

From man cat:

With no FILE, or when FILE is -, read standard input

Suggestions?

[dreamstu]

+1

[tracker1]

See readline or readline-sync

readline-sync defaults to stdio, for readline you'll need something like below...

//readline
var readline = require('readline');

var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

rl.on('line', function (cmd) {
  console.log('You just typed: '+cmd);
});

[iolufemi]

+1

[iolufemi]

See the method used in issue #203
If it relates to this.

[medihack]

I am having the same problem as in #203, but I don't want to provide a text file with the password. I want to type it in manually. Doesn't seem to work with shelljs :-(
+1

[nfischer]

@pfraces Sounds like something we'd be interested in 👍

[nfischer]

Please ping this thread if you run into any issues implementing this. Thanks!

[nfischer]

Sounds good to me. Thanks for pointing that out.

If you can implement it to work with - as a file name, I'll try to modify the the internal function for reading from the left-hand-side of a pipe to also check standard input if it's not in a pipe.

[ariporad]

Hmm...

(Sorry to interject)...

Here's the problem with that: cat - is async, it doesn't return until you tell it to... I'm not sure how that would integrate with shelljs.

[nfischer]

How is cat async? It blocks while it reads input, and returns when it receives EOF.

[ariporad]

async isn't really the right word, but I'm not sure how to describe it.

Usually, It works like this:

$ cat _ > foo.txt && echo "Done"
> Blah Blah Blah
> ^C
Done
$

So, that would become:

$ node
> $.cat('-'); $.echo("Done");
---> Blah Blah Blah
---> ^C # Now this doesn't work, it kills node instead.
Done # This never happens

[nfischer]

I believe the standard way of sending EOF is to use ^D instead. If we really wanted, we could write a signal handler for ^C, but I'd prefer to hold off, especially since this is a less-common use-case. We can implement that if there are feature requests down the road.

[ariporad]

Ok, That works for me.

Thanks! Ari
On Tue, Jun 7, 2016 at 8:03 PM, Nate Fischer [email protected] wrote:
I believe the standard way of sending EOF is to use ^D instead. If we really wanted, we could write a signal handler for ^C , but I'd prefer to hold off, especially since this is a less-common use-case. We can implement that if there are feature requests down the road.

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