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Archive for August, 2010

Squeak/Pharo command line scripting

August 9th, 2010 3 comments

UPDATE (5/22/2011): I figured out how to use the “open” command, instead of digging into the bundle. See the “Scripting the Image” section below.

Typical Workflow

I go through a lot of images.  It’s just the way it is – make some changes to a package, try to load it in a fresh image, open another image with an older version to compare.

The Case for Scripting

The frustrating part is not using many images (which is pretty cool – to have multiple computers running at once… but I digress), but setting up the images every time.  So I decided I’d find a way to load common configurations automatically.  But how would I communicate to the image that it should run certain code on startup?  A quick google found writing scripts.

Poor Command of the Mac Command Line

This sounded like just what I needed, but I ran into a bit of trouble with the Mac command line:

~$ open -a /Applications/Squeak\ 4.2.5beta1U
FSPathMakeRef(/Applications/Squeak 4.2.5beta1U) failed with error -43.
~$ open -a Squeak\ 4.2.5beta1U ./Pharo-1.1-scripting/Pharo-1.1-11411dev10.07.1.image
Unable to find application named ‘Squeak 4.2.5beta1U’
~$ /Applications/Squeak\ 4.2.5beta1U ./Pharo-1.1-scripting/Pharo-1.1-11411dev10.07.1.image
-bash: /Applications/Squeak 4.2.5beta1U: No such file or directory
~$ /Applications/Squeak\ 4.2.5beta1U.app ./Pharo-1.1-scripting/Pharo-1.1-11411dev10.07.1.image
-bash: /Applications/Squeak 4.2.5beta1U.app: is a directory

Scripting the Image!

I finally figured out that what I needed to do was use the “–arg” flag with “open”, so:
~$ open -a /Applications/Squeak\ 4.2.5beta1U.app/ –args

./Pharo-1.1-11411dev10.07.1.image /Users/sean/Squeak/SpdImageSetup.st testArgument

Or you could call the actual binary inside the .app bundle (but this opens it in the background):
~$ “/Applications/Squeak 4.2.5beta1U.app/Contents/MacOS/Squeak VM Opt” ./Pharo-1.1-11411dev10.07.1.image /Users/sean/Squeak/SpdImageSetup.st testArgument
And, bingo!  The image opened and filed in the .st file.  The arguments are available with SmalltalkImage>>getSystemAttribute:  So, for example (in Squeak 4.1), “Smalltalk getSystemAttribute: 3″ returned ‘testArgument’

Running the Script Automatically on Startup

The other thing to know is that you cause the filed in code to run automatically by creating a class>>initialize method somewhere in it, which is run immediately after the code is loaded.
Categories: Pharo, Squeak Tags:

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