public static void Sort()
{
// ReSharper disable once InvalidXmlDocComment
/**
* Topological sort.
* Depth first, because it's the easiest to understand.
* https://en.wikipedia.org/wiki/Topological_sorting
*
* L ← Empty list that will contain the sorted nodes // we'll use done.
* while exists nodes without a permanent mark do
* select an unmarked node n
* visit(n)
*
* function visit(node n)
* if n has a permanent mark then // is in done list
* return
* if n has a temporary mark then // is in progress list
* stop (not a DAG)
*
* mark n with a temporary mark // add to progress list
*
* for each node m with an edge from n to m do // visit each dependency
* visit(m)
*
* remove temporary mark from n // remove from progress list
* mark n with a permanent mark // add to done list
* add n to head of L
*/
var graph = new Dictionary <ModButton, HashSet <ModButton> >();
var done = new HashSet <ModButton>();
var progress = new HashSet <ModButton>();
// create a directed acyclic graph.
foreach (var activeButton in ActiveButtons)
{
if (!graph.ContainsKey(activeButton))
{
graph[activeButton] = new HashSet <ModButton>();
}
if (!(activeButton is ModButton_Installed installedActiveButton))
{
continue;
}
foreach (var target in installedActiveButton.Manifest.LoadBefore
.Select(d => d.Target)
.Where(t => t != null))
{
var targetButton = ModButton_Installed.For(target);
if (!graph.ContainsKey(targetButton))
{
graph[targetButton] = new HashSet <ModButton>();
}
graph[targetButton].Add(activeButton);
}
foreach (var target in installedActiveButton.Manifest.LoadAfter
.Concat(installedActiveButton.Manifest.Dependencies)
.Select(d => d.Target)
.Where(t => t != null))
{
var targetButton = ModButton_Installed.For(target);
graph[activeButton].Add(targetButton);
if (!graph.ContainsKey(targetButton))
{
graph[targetButton] = new HashSet <ModButton>();
}
}
}
// do that sort
foreach (var activeButton in ActiveButtons)
{
var success = Sort_Visit(activeButton, graph, ref done, ref progress);
if (!success)
{
// we have a cyclic dependency.
Messages.Message(I18n.SortFailed_Cyclic(activeButton.Name, success.Reason), MessageTypeDefOf.CautionInput, false);
return;
}
}
// reset mod list, then add mods back in order.
SoundDefOf.Tick_High.PlayOneShotOnCamera();
Reset(false);
foreach (var mod in done)
{
// try to avoid re-caching too many times.
if (mod is ModButton_Installed installed)
{
installed.Selected.Active = true;
}
else
{
mod.Active = true;
}
TryAdd(mod, false);
}
Notify_ModListChanged();
}