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Omar and Lorraine
Omar and Lorraine

Reputation: 1266

Chicken Scheme and command line arguments

I am writing a program in Scheme which needs to examine the command line arguments. I figure a good way to get an executable is to use Chicken Scheme to compile the thing, but then I am running into problems:

Here are the contents of test.sch

(display (command-line))

I am invoking the compiler like so:

csc -require-extension r5rs test.sch

Which gives the following warning:

Warning: extension `r5rs' is currently not installed

but proceeds to generate an executable test. That executable, when run, 

 $ ./test 

Error: (require) cannot load extension: r5rs

    Call history:

    ##sys#require       <--

Is r5rs an extension? I don't think so, since chicken-install doesn't seem to know about it:

 $ chicken-install r5rs

Error: unrecognized file-information - possibly corrupt transmission: "(error \"no such extension or version\" \"r5rs\" #f)"

I think I need to import r5rs to get the procedures (display) and (command-line). But I cannot figure that out. I'd appreciate if someone can explain what I need to do to these two procedures bound so that

Upvotes: 1

Views: 927

Answers (1)

Sylwester
Sylwester

Reputation: 48765

Command line arguments are not a part of the R5RS or any other of the Scheme reports. Every implementation that supports a method has their own way and Chicken uses the built in parameter command-line-arguments:

$ echo '(display (command-line-arguments))' > test.scm
$ csc test.scm
$ ./test 1 2 3
(1 2 3)

Edit: The (command-line-arguments) documentation has since been updated for Chicken 5, which you can view in documentation under Using the interpreter.

Upvotes: 1

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