/usr/share/gnucash/scm/config-var.scm is in gnucash-common 1:2.6.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | ;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2 of
;; the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652
;; Boston, MA 02110-1301, USA gnu@gnu.org
;;; config-var: You can create them, set values, find out if the value
;;; is different from the default, and you can get a description. You
;;; can also specify an action function which will be called whenever
;;; the value is changed. The action function receives the special
;;; var and the new value as arguments and should return either #f if
;;; the modification should be rejected, or a list containing the
;;; result otherwise.
;;; Finally, a config var has two states, "officially" modified, and
;;; unofficially modified. You control what kind of modification
;;; you're making with the second argument to
;;; gnc:config-var-value-set! The idea is that options specified on
;;; the command line will set the value of these config vars, but that
;;; setting is considered transient. Other settings (like from the UI
;;; preferences panel, or normal user code) should be considered
;;; permanent, and if they leave the variable value different from the
;;; default, should be saved to the auto configuration file.
(define (gnc:make-config-var description
set-action-func
equality-func
default)
(let ((var (vector description set-action-func
equality-func #f default default)))
(gnc:config-var-value-set! var #f default)
var))
(define (gnc:config-var-description-get var) (vector-ref var 0))
(define (gnc:config-var-action-func-get var) (vector-ref var 1))
(define (gnc:config-var-equality-func-get var) (vector-ref var 2))
(define (gnc:config-var-modified? var) (vector-ref var 3))
(define (gnc:config-var-modified?-set! var value) (vector-set! var 3 value))
(define (gnc:config-var-default-value-get var) (vector-ref var 4))
(define (gnc:config-var-default-value-set! var value)
(vector-set! var 4 value))
(define (gnc:config-var-value-get var) (vector-ref var 5))
(define (gnc:config-var-value-set! var is-config-mod? value)
(let ((set-action (gnc:config-var-action-func-get var))
(result (list value)))
(if set-action (set! result (set-action var value)))
(if result
(begin
(if is-config-mod? (gnc:config-var-modified?-set! var #t))
(vector-set! var 5 (car result))))))
(define (gnc:config-var-value-is-default? var)
(if (not (gnc:config-var-modified? var))
#t
(let ((equal-values? (gnc:config-var-equality-func-get var)))
(equal-values?
(gnc:config-var-default-value-get var)
(gnc:config-var-value-get var)))))
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