One method is to simply parse the wiki markup itself and turn that into slides by effectively walking through the structure of the page (one slide for each section, and stepping through the bullets). For this approach, a Greasemonkey script will do.
setup: function() {
this.sections = [];
this.pos = 0;
var body = document.getElementsByTagName('body')[0];
this.orig_markup = body.innerHTML;
var markup = body.innerHTML;
var start = 0;
var end = markup.indexOf('<span class="editsection"');
while (end != -1) {
start = markup.indexOf('</span>', end);
end = markup.indexOf('<span class="editsection"', start);
if (end == -1) {
end = markup.indexOf('<div class="printfooter">', start);
this.sections.push(markup.substr(start, end - start));
end = -1;
}
this.sections.push(markup.substr(start, end - start));
}
if (this.sections.length > 0) {
var div = document.getElementById('bodyContent');
var link = div.insertBefore(document.createElement('a'), div.firstChild);
link.innerHTML = 'Start presentation';
link.setAttribute('href', '#presentation');
link.addEventListener('click', this.start, false);
}
},
start: function() {
var body = document.getElementsByTagName('body')[0];
body.innerHTML = '';
body.style.textAlign = 'center';
var prev = body.appendChild(document.createElement('a'));
prev.innerHTML = '← Prev';
prev.setAttribute('href', '#prev');
prev.style.font = '11px verdana, sans-serif';
prev.addEventListener('click', function() {
wikipedia_presentation.prev();
}, false);
body.appendChild(document.createTextNode(' / '));
var stop = body.appendChild(document.createElement('a'));
stop.innerHTML = 'Exit';
stop.setAttribute('href', '#exit');
stop.style.font = '11px verdana, sans-serif';
stop.addEventListener('click', function() {
wikipedia_presentation.stop();
}, false);
body.appendChild(document.createTextNode(' / '));
var next = body.appendChild(document.createElement('a'));
next.innerHTML = 'Next →';
next.setAttribute('href', '#next');
next.style.font = '11px verdana, sans-serif';
next.addEventListener('click', function() {
wikipedia_presentation.next();
}, false);
var slide = body.appendChild(document.createElement('div'));
slide.setAttribute('id', 'wikipedia_presentation');
slide.style.width = '780px';
// slide.style.background = 'red';
slide.style.margin = '10px 10px 10px 20px';
slide.style.textAlign = 'left';
slide.style.font = '2em verdana, sans-serif';
slide.innerHTML = wikipedia_presentation.sections[0];
var items = slide.getElementsByTagName('li');
for (var i = 1; i < items.length; i++) {
items[i].style.display = 'none';
}
document.addEventListener('keypress', wikipedia_presentation.keypress, false);
},
stop: function() {
var body = document.getElementsByTagName('body')[0];
body.innerHTML = wikipedia_presentation.orig_markup;
body.style.textAlign = 'left';
wikipedia_presentation.setup();
document.removeEventListener('keypress', wikipedia_presentation.keypress, false);
},
keypress: function(event) {
if (event.keyCode == 39) {
wikipedia_presentation.next();
} else if (event.keyCode == 37) {
wikipedia_presentation.prev();
}
},
prev: function() {
this.pos--;
if (this.pos == -1) {
this.pos = this.sections.length - 1;
}
var slide = document.getElementById('wikipedia_presentation');
slide.innerHTML = wikipedia_presentation.sections[this.pos];
},
next: function() {
var slide = document.getElementById('wikipedia_presentation');
var items = slide.getElementsByTagName('li');
var hidden = 0;
for (var i = 0; i < items.length; i++) {
if (items[i].style.display == 'none') {
hidden++;
}
}
if (hidden > 0) {
items[items.length - hidden].style.display = 'list-item';
return;
}
this.pos++;
if (this.pos == this.sections.length) {
this.pos = 0;
}
slide.innerHTML = wikipedia_presentation.sections[this.pos];
var items = slide.getElementsByTagName('li');
for (var i = 1; i < items.length; i++) {
items[i].style.display = 'none';
}
}