/usr/share/gnucash/scm/html-piechart.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.
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;; html-piechart.scm : generate HTML programmatically, with support
;; for simple style elements.
;; Copyright 2000 Bill Gribble <grib@gnumatic.com>
;;
;; 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
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(load-from-path "html-jqplot")
(define <html-piechart>
(make-record-type "<html-piechart>"
'(width
height
title
subtitle
data
colors
labels
button-1-slice-urls
button-2-slice-urls
button-3-slice-urls
button-1-legend-urls
button-2-legend-urls
button-3-legend-urls)))
(define gnc:html-piechart?
(record-predicate <html-piechart>))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; <html-piechart> class
;; generate the <object> form for a piechart.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define gnc:make-html-piechart-internal
(record-constructor <html-piechart>))
(define (gnc:make-html-piechart)
(gnc:make-html-piechart-internal -1 -1 #f #f #f #f #f #f #f #f #f #f #f))
(define gnc:html-piechart-data
(record-accessor <html-piechart> 'data))
(define gnc:html-piechart-set-data!
(record-modifier <html-piechart> 'data))
(define gnc:html-piechart-width
(record-accessor <html-piechart> 'width))
(define gnc:html-piechart-set-width!
(record-modifier <html-piechart> 'width))
(define gnc:html-piechart-height
(record-accessor <html-piechart> 'height))
(define gnc:html-piechart-set-height!
(record-modifier <html-piechart> 'height))
(define gnc:html-piechart-labels
(record-accessor <html-piechart> 'labels))
(define gnc:html-piechart-set-labels!
(record-modifier <html-piechart> 'labels))
(define gnc:html-piechart-colors
(record-accessor <html-piechart> 'colors))
(define gnc:html-piechart-set-colors!
(record-modifier <html-piechart> 'colors))
(define gnc:html-piechart-title
(record-accessor <html-piechart> 'title))
(define gnc:html-piechart-set-title!
(record-modifier <html-piechart> 'title))
(define gnc:html-piechart-subtitle
(record-accessor <html-piechart> 'subtitle))
(define gnc:html-piechart-set-subtitle!
(record-modifier <html-piechart> 'subtitle))
;; FIXME url's haven't been working since GnuCash 1.x
;; GnuCash 2.x switched from guppy to goffice, which
;; made it very hard to remain the url functionality
;; At this point I (gjanssens) is in the process of
;; moving from goffice to jqplot for our charts
;; which perhaps may allow urls again in the charts
;; I'm keeping the parameters below around to remind
;; us this still has to be investigated again
(define gnc:html-piechart-button-1-slice-urls
(record-accessor <html-piechart> 'button-1-slice-urls))
(define gnc:html-piechart-set-button-1-slice-urls!
(record-modifier <html-piechart> 'button-1-slice-urls))
(define gnc:html-piechart-button-2-slice-urls
(record-accessor <html-piechart> 'button-2-slice-urls))
(define gnc:html-piechart-set-button-2-slice-urls!
(record-modifier <html-piechart> 'button-2-slice-urls))
(define gnc:html-piechart-button-3-slice-urls
(record-accessor <html-piechart> 'button-3-slice-urls))
(define gnc:html-piechart-set-button-3-slice-urls!
(record-modifier <html-piechart> 'button-3-slice-urls))
(define gnc:html-piechart-button-1-legend-urls
(record-accessor <html-piechart> 'button-1-legend-urls))
(define gnc:html-piechart-set-button-1-legend-urls!
(record-modifier <html-piechart> 'button-1-legend-urls))
(define gnc:html-piechart-button-2-legend-urls
(record-accessor <html-piechart> 'button-2-legend-urls))
(define gnc:html-piechart-set-button-2-legend-urls!
(record-modifier <html-piechart> 'button-2-legend-urls))
(define gnc:html-piechart-button-3-legend-urls
(record-accessor <html-piechart> 'button-3-legend-urls))
(define gnc:html-piechart-set-button-3-legend-urls!
(record-modifier <html-piechart> 'button-3-legend-urls))
(define (gnc:html-piechart-render piechart doc)
(define (ensure-positive-numbers nlist)
(map
(lambda (elt)
(cond ((number? elt)
(exact->inexact (abs elt)))
((string? elt)
(with-input-from-string elt
(lambda ()
(let ((n (read)))
(if (number? n) (abs n) 0.0)))))
((gnc:gnc-numeric? elt)
(abs (gnc-numeric-to-double elt)))
(#t
0.0)))
nlist))
(define (catenate-escaped-strings nlist)
(if (not (list? nlist))
""
(with-output-to-string
(lambda ()
(for-each
(lambda (s)
(let ((escaped
(regexp-substitute/global
#f " "
(regexp-substitute/global
#f "\\\\" s
'pre "\\\\" 'post)
'pre "\\ " 'post)))
(display escaped)
(display " ")))
nlist)))))
(let* ((retval '())
(push (lambda (l) (set! retval (cons l retval))))
(title (gnc:html-piechart-title piechart))
(subtitle (gnc:html-piechart-subtitle piechart))
(url-1
(catenate-escaped-strings
(gnc:html-piechart-button-1-slice-urls piechart)))
(url-2
(catenate-escaped-strings
(gnc:html-piechart-button-2-slice-urls piechart)))
(url-3
(catenate-escaped-strings
(gnc:html-piechart-button-3-slice-urls piechart)))
(legend-1
(catenate-escaped-strings
(gnc:html-piechart-button-1-legend-urls piechart)))
(legend-2
(catenate-escaped-strings
(gnc:html-piechart-button-2-legend-urls piechart)))
(legend-3
(catenate-escaped-strings
(gnc:html-piechart-button-3-legend-urls piechart)))
(data
(ensure-positive-numbers (gnc:html-piechart-data piechart)))
; Use a unique chart-id for each chart. This prevents chart
; clashed on multi-column reports
(chart-id (string-append "chart-" (number->string (random 999999)))))
(if (and (list? data)
(not (null? data)))
(begin
(push (gnc:html-js-include "jqplot/jquery.min.js"))
(push (gnc:html-js-include "jqplot/jquery.jqplot.js"))
(push (gnc:html-js-include "jqplot/jqplot.pieRenderer.js"))
(push (gnc:html-css-include "jqplot/jquery.jqplot.css"))
(push "<div id=\"")(push chart-id)(push "\" style=\"width:")
(push (gnc:html-piechart-width piechart))
(push "px;height:")
(push (gnc:html-piechart-height piechart))
(push "px;\"></div>\n")
(push "<script id=\"source\">\n$(function () {")
(push "var data = [];\n")
(if (and data (list? data))
(begin
(for-each
(lambda (datum label)
(push " data.push(['")
(push (jqplot-escape-string label))
(push "',")
(push datum)
(push "]);\n"))
data (gnc:html-piechart-labels piechart))))
(push "var options = {
seriesDefaults: {
renderer: $.jqplot.PieRenderer,
},
legend: {
show: true,
placement: \"outsideGrid\", },
};\n")
(if title
(begin
(push " options.title = \"")
(push (jqplot-escape-string title))
(push "\";\n")))
(if subtitle
(begin
(push " options.title += \" (")
(push (jqplot-escape-string subtitle))
(push ")\";\n")))
(push "$.jqplot.config.enablePlugins = true;\n")
(push "var plot = $.jqplot('")(push chart-id)(push "', [data], options);\n")
(push "});\n</script>"))
(begin (gnc:warn "null-data, not rendering piechart")
" "))
retval))
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