String variable to stdin interface

Question

I'd like to use the stdin parameter of this function: http://graspjs.com/docs/lib/.

The grasp function expects this parameter to be an object with the same interface that process.stdin. And what I have is a simple variable in memory of type string.

How can I give this variable to the stdin input of this function?

var grasp = require('grasp');
var sourceCode = 'if (condititon) { console.log("In the condition"); }';

grasp({
    args: '--equery condititon --replace true',
    stdin: SomethingLikeStringToStdin(sourceCode),
    callback: console.log 
});

Expected log:

if (true) { console.log("In the condition"); }

gkz · Accepted Answer · 2013-12-18 00:33:25Z

2

With Grasp 0.2.0, you can now use the new input option when using Grasp as a library, or use one of the two new helper functions: grasp.search and grasp.replace. This will allow you to do what you want without having to create a fake StdIn.

Documentation: http://graspjs.com/docs/lib/

answered Dec 18, 2013 at 0:33

gkz

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1 Comment

mquandalle Over a year ago

Thank you for this new functionality @gkz :-)

Paul Mougel · Accepted Answer · 2013-11-09 16:19:34Z

1

process.stdin is a Readable Stream. What grasp expects is a stream that it can read data from. To simulate this behavior, you can use a PassThrough stream: it's a stream that you can write strings of buffer to, and which will emit this data out, as any readable stream would.

Here is an usage example:

var stream = require('stream');
var passthrough = new stream.PassThrough();

grasp({ stdin: passthrough });
passthrough.push('some data');
passthrough.push('some other data');
passthrough.end();

answered Nov 9, 2013 at 16:19

Paul Mougel

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