massgrave.dev/_site/site_libs/navigation-1.1/codefolding.js

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window.initializeCodeFolding = function(show) {
// handlers for show-all and hide all
$("#rmd-show-all-code").click(function() {
$('div.r-code-collapse').each(function() {
$(this).collapse('show');
});
});
$("#rmd-hide-all-code").click(function() {
$('div.r-code-collapse').each(function() {
$(this).collapse('hide');
});
});
// index for unique code element ids
var currentIndex = 1;
// select all R code blocks
var rCodeBlocks = $('pre.r, pre.python, pre.bash, pre.sql, pre.cpp, pre.stan, pre.julia, pre.foldable');
rCodeBlocks.each(function() {
// skip if the block has fold-none class
if ($(this).hasClass('fold-none')) return;
// create a collapsable div to wrap the code in
var div = $('<div class="collapse r-code-collapse"></div>');
var showThis = (show || $(this).hasClass('fold-show')) && !$(this).hasClass('fold-hide');
var id = 'rcode-643E0F36' + currentIndex++;
div.attr('id', id);
$(this).before(div);
$(this).detach().appendTo(div);
// add a show code button right above
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var showCodeText = $('<span>' + (showThis ? 'Hide' : 'Show') + '</span>');
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var showCodeButton = $('<button type="button" class="btn btn-default btn-xs btn-secondary btn-sm code-folding-btn pull-right float-right"></button>');
showCodeButton.append(showCodeText);
showCodeButton
.attr('data-toggle', 'collapse')
.attr('data-bs-toggle', 'collapse') // BS5
.attr('data-target', '#' + id)
.attr('data-bs-target', '#' + id) // BS5
.attr('aria-expanded', showThis)
.attr('aria-controls', id);
var buttonRow = $('<div class="row"></div>');
var buttonCol = $('<div class="col-md-12"></div>');
buttonCol.append(showCodeButton);
buttonRow.append(buttonCol);
div.before(buttonRow);
// show the div if necessary
if (showThis) div.collapse('show');
// update state of button on show/hide
// * Change text
// * add a class for intermediate states styling
div.on('hide.bs.collapse', function () {
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showCodeText.text('Show');
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showCodeButton.addClass('btn-collapsing');
});
div.on('hidden.bs.collapse', function () {
showCodeButton.removeClass('btn-collapsing');
});
div.on('show.bs.collapse', function () {
showCodeText.text('Hide');
showCodeButton.addClass('btn-expanding');
});
div.on('shown.bs.collapse', function () {
showCodeButton.removeClass('btn-expanding');
});
});
}