Re: [MacPerl] Self-updating Perl script ("exec" equivalent)?

[Tom Sackett <tsackett@adobe.com>]

At 01:45 PM 8/15/99 -0400, Chris Nandor wrote:
>At 12.40 -0700 1999.08.13, Tom Sackett wrote:
>>For most housekeeping tasks, this works great. However, I also need,
>>sometimes, to update the client script itself, which means that client
>>script has to terminate and be re-launched. This was easy to implement in
>>Windows using "exec," but I can't find a way to do it in MacPerl.
>
>There is no clean way to do it.  Search on the list archives for
>"launchotherperl.plx".  It is a kludge to make a copy of the MacPerl app,
>and then launch it with another script.  Under Mac OS, each app can only be
>running once, so you need copies.  That script might do what you need, even
>if it takes a bit of modification.


After a weekend away from my computer, and a few hours more
experimentation, I think I've found a relatively clean way of making a
script exit and launch another script (in the manner of "exec"). You can
just call this subroutine from within a script, providing it with one
parameter, a path to the script you want to launch. This is pretty basic,
and lacks even simple error handling; anyone using it might want to beef it
up a bit.

#----------------------------------------------
# LaunchOther
# This Mac subroutine exits the current script 
# completely and launches another script.
# It requires the module Mac::AppleEvents.
# It takes one parameter, a path to the script
# to be launched.
#----------------------------------------------
sub LaunchOther
{
	#set up AppleScript
	my ($scriptPath) = @_;
	my ($ASstring) = qq{
	try
		with timeout of 0 seconds
			tell application "MacPerl"
				Do Script "$scriptPath"
			end tell
		end timeout
	on error
	end try
	};
	MacPerl::DoAppleScript ($ASstring);
	exit;
}

- Tom Sackett
  tsackett@adobe.com

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