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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-10052) Improve superspawn to allow to handle spawned process io streams
Date Tue, 02 Feb 2016 11:35:39 GMT

    [ https://issues.apache.org/jira/browse/CB-10052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128105#comment-15128105
] 

ASF GitHub Bot commented on CB-10052:
-------------------------------------

Github user vladimir-kotikov commented on the pull request:

    https://github.com/apache/cordova-lib/pull/369#issuecomment-178520650
  
    @dblotsky, it seems that didn't really understand your idea. Could you please clarify,
where do you propose to return `stdout` and `stderr` from?


> Improve superspawn to allow to handle spawned process io streams
> ----------------------------------------------------------------
>
>                 Key: CB-10052
>                 URL: https://issues.apache.org/jira/browse/CB-10052
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: CordovaCommon
>    Affects Versions: 1.0.0
>            Reporter: Vladimir Kotikov
>            Assignee: Vladimir Kotikov
>             Fix For: 1.1.0
>
>
> Sometimes it is useful to process spawned process stdout and stderr in some way before
out this to console. The current implementation of superspawn doesn't give a way to do this.
One of the cases when this could be helpful - CB-9971 (see https://github.com/apache/cordova-android/pull/240
for some discussion).
> The proposed approach is:
> 1. Add ability to accept any valid stdio configuration, just like the original child_process.spawn
does (https://nodejs.org/api/child_process.html#child_process_options_stdio)
> 2. Give a way to caller to listen to stdout and stderr events. This might be implemented
as resultant promise progress notification:
> {code:JavaScript}
> spawn('mycommand', [], {stdio: 'pipe'})
> .progress(function (stdio){
>     if (stdio.stderr) {
>         console.error(stdio.stderr);
>     }
> })
> .then(function(result){
>     // do other stuff
> })
> {code}
> Another option is to return na object that implements both EventEmitter and Promise interfaces,
so anybody might subscribe to its events.



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