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combine was built with Guile (GNU’s Ubiquitous Intelligent
Language for Extensibility), you can do anything you want (within reason) to
combine. This would have been set up when
compiled and installed on your computer. In a number of places, there
are built-in opportunities to call Guile with the data that is currently in
process. Using these options, you can use your favorite modules or write your
own functions in scheme to manipulate the data and to adjust how
operates on it.
The most common method (in my current usage) of extending
to alter the values of fields from the input files before they are used
for matching or for output. This is done inside the field list by
adding the scheme statement after the range and precision. This is
covered in the section on field specifications. See section Field-specific extensions, for details.
Another useful option is the ability to initialize Guile with your own
program. To do this, you can use the ‘--extension-init-file’ (or
‘-X’) followed by a file name.
combine will load that
scheme file into Guile before any processing. In that way your
functions will be available when you need them in the running of the
program. It certainly beats writing something complicated on the
In addition, there are Guile modules included in the distribution, which can be used in extension scripts.
|4.1 Extension Options|
|4.2 Guile Modules|
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