deferred-exec

deferred-exec

Deferred based tool to run exec commands

Installing

Install the module with: npm install deferred-exec or add it to your project's package.json file.

You can also clone this repo and npm install folderOfClonedRepo to get a branch or development copy.

Using

All calls return a promise, which means it's easy to do stuff when they complete or fail:

var dexec = require( 'deferred-exec' );

dexec( 'echo "yay"' )
  .done( function( stdout, stderr, command ) {
    console.log( stdout ); // logs "yay"
  })
  .fail( function( error ) {
    console.log( "it didn't work :( got code:", error.code );
  });

Since they are deferreds, you can pass them around in your code:

var dexec = require( 'deferred-exec' );

var command = dexec( 'echo "gotcha"' );

doSomethingWithCommand( command );

// meanwhile, in some other part of your application
function doSomethingWithCommand( command ) {
  command.done( function( stdout, stderr, command ) {
    console.log( 'just ran', command, 'and got', stdout );
  });
}

Use Underscore.Deferred if you want to use _.when to group multiple commands. (Note: you can use underscore.deferred with lodash)

var dexec = require( 'deferred-exec' );

// require and mixin lodash with _.deferred
var _ = require( 'lodash' );
_.mixin( require( 'underscore.deferred' ) );

var commandA = dexec( 'ls /etc' );
var commandB = dexec( 'echo "hi"' );

// when both commands succeed
_.when( commandA, commandB )
  .done( function( a, b ){
    console.log( 'commandA output:', a[0] );
    console.log( 'commandB output:', b[0] );
  });

Or run a file using .file

var dexec = require( 'deferred-exec' );

dexec.file( './someFile.sh' )
  .done( function( stdout, stderr, fileName ) {
    console.log( 'ran', fileName, 'got', stdout );
  });

Reference

For deferred-exec details see child_process.exec for available options

For deferred-exec.file details see child_process.execFile for available options

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.

License

Copyright (c) 2012 Dan Heberden
Licensed under the MIT license.