Using Dyalog APL as a scripting language

[alexeyv]

The GNU APL allows to write APL code in text file and execute it as an ordinary script:

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#!apl --script --

⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝⍝
⍝ Simple APL script example

a←⍳10
⎕←a

)off


Run it:

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./print.apl
1 2 3 4 5 6 7 8 9 10



Is there a way to use Dyalog APL in the similar manner?

[alexeyv]

Ok what I finally did was to create a workspace with

      ⎕LX←'⍎''main''⋄ ⎕off'

where main is the entry function, and run it like this:

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dyalog -b -s ~/Sources/apl/dyalog-workspaces/test.dws

However there are 2 problems here:
1. If I want to "load" this workspace again, it closes the interpreter (because ⎕LX contains ⎕off)
2. I couldn't find a way to send command line arguments to the workspace.

Is where a way to overcome these problems?

[woody]

Maybe

⎕XLOAD WSNAME

or

)XLOAD WSNAME

?

[alexeyv]

Thanks, this solves problem 1.

[woody]

I found this info from the late, great Dan.

You can pass a variety of arguments when calling APL... and then dig them out with

2 ⎕NQ'.' 'getcommandlineargs'

If you use 2 ⎕NQ'.' 'getcommandlineargs' you will get all the command line arguments as a VTV (Vector of Text Vectors) which you can deal with.

There are many arguments you can give to the interpreter - they are listed in the PDF in the help folder.

Those that are not recognized by the APL interpreter are left alone. You could use this feature to pass your own arguments, e.g. PORT=4500.

Hope that helps!

//W

[jwied]

Instead of the latent expression, you could use a script-file "*.dyalog" with scripted APL commands - created with ]save - and pipe this into dyalog.exe:

dyalog.exe <commands.dyalog -x -q myworkspace.dws