5.7.2 Invoking Guile Actions

Guile actions are invoked from the RULE section using the guile-process command. Its syntax is:

Scheme Function: function args

Arguments:

function

The name of the Guile function to be invoked.

args

Additional arguments. These are passed to the function as its third argument (rest).

To pass keyword arguments to the function, use the usual Scheme notation: ‘#:key’.

As an example, let’s consider the invocation of the fix-subject function, defined in the previous subsection:

guile-process fix-subject <<-EOT
                                ----------
                                Kind regards,
                                Antonius Block
                          EOT

In this example, the additional argument (a string of three lines) is passed to the function, which will add it to the message of the body.

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