[shell] at tagSwap.net: Open Source Lasso Code

[shell]

Description

Link: [shell]

Author: Jason Huck

Category: OS Process

Version: 8.5.x

License: Public Domain

Posted: Jun. 12, 2006

Updated: Aug. 27, 2008

More by this author...

This is a simple wrapper for the [os_process] type that allows you to interact with a bash shell, similar to how you would if you were using Terminal on OS X. On Windows, it interacts with the cmd process. The tag creates a new [os_process] type, opens a new shell, switches the current working directory to the folder from which the tag was called, and executes whatever command is passed to it. Requires [response_localfolder] and only loads if the [os_process] type is loaded.

Parameters

none

Sample Usage

shell('echo foo');

-> foo

Source Code

Click the "Download" button below to retrieve a copy of this tag, including the complete documentation and sample usage shown on this page. Place the downloaded ".inc" file in your LassoStartup folder, restart Lasso, and you can begin using this tag immediately.

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if(lasso_tagexists('os_process'));
	define_tag(
		'shell',
		-required='cmd',
		-privileged,
		-priority='replace',
		-description='Executes a single shell command via [os_process].'
	);
		local('os') = lasso_version( -lassoplatform);
	
		if(#os >> 'Win');
			local('shell') = os_process(
				'cmd',
				(: '/c cd ' + response_localfolder + ' && ' + #cmd)
			);		
		else;
			local('shell') = os_process(
				'/bin/bash',
				(: '-c', 'cd ' + response_localfolder + '; ' + #cmd)
			);
		/if;
		
		local('out') = #shell->read;
		!#out->size ? #out = #shell->readerror;
		#shell->close;
		return(#out);
	/define_tag;
/if;

Related Tags

[response_localfolder]

Comments

08/27/2008, Jason Huck
Updated
[shell] now works on all platforms. It uses a bash shell on Mac and Linux, and cmd.exe on Windows.

02/11/2008, Jason Huck
Updated
[shell] now returns the contents of stderr if stdout was empty.

02/11/2008, Pier Kuipers
Adding optional "readerror"
Having used this tag with great effect for some time now, I found just one problem with it - sometimes the required output from cli operations is strictly regarded as an error, in which case [shell] does not return anything. To solve this problem, I added -optional='osreaderror' parameter to the tag's definition, which is called just before #shell->close as follows: if(local_defined('osreaderror')); #out = #shell->readerror; /if; It does the trick for me, and you might consider updating your tag to include this option if you think it worthwhile :-)