gEDA Project Wiki

gEDA/gaf uses Guile Scheme to provide Scheme scripting capabilities, and all of the features of Guile are available to use. The Guile Reference Manual is available as an Info manual (info guile on most systems), or on the Guile website.

A collection of modules is provided for accessing and modifying gEDA objects and pages, called the gEDA Scheme API. The gEDA Scheme Reference Manual is also available as an Info manual (info geda-scheme).

• Scripting a gnetlist backend in scheme (John Doty)

See also the Extending gschem section of the gEDA gschem User Guide, and Scheme Backend API section of the gEDA gnetlist User Guide.

• gnetlist Scheme primitives

For instance, let's remove all objects which are circles or arcs with zero radius:

(use-modules (geda page))
 
; Checks if the OBJECT is a circle or an arc with zero radius
(define (zero-radius-object? object)
  (or
    (and (circle? object) (= (circle-radius object) 0))
    (and (arc?    object) (= (arc-radius    object) 0))))
 
(apply page-remove! (active-page)
       (filter
         zero-radius-object?
         (page-contents (active-page))))