From e333ef9cb80e40637235198f9c113fa8cfe0fceb Mon Sep 17 00:00:00 2001
From: Aleks Kissinger <aleks0@gmail.com>
Date: Mon, 13 Apr 2020 16:54:08 +0100
Subject: split path works

---
 src/gui/tikzscene.cpp    | 20 +++++++++++++++++++-
 src/gui/undocommands.cpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/gui/undocommands.h   | 15 +++++++++++++++
 3 files changed, 78 insertions(+), 1 deletion(-)

diff --git a/src/gui/tikzscene.cpp b/src/gui/tikzscene.cpp
index da52277..57ddb48 100644
--- a/src/gui/tikzscene.cpp
+++ b/src/gui/tikzscene.cpp
@@ -399,7 +399,25 @@ void TikzScene::makePath()
 
 void TikzScene::splitPath()
 {
-    // TODO: stub
+    QSet<Node*> selNodes;
+    QSet<Edge*> edges;
+    getSelection(selNodes, edges);
+
+    // if no edges are selected, try to infer edges from nodes
+    if (edges.isEmpty()) {
+        foreach(Edge *e, graph()->edges()) {
+            if (selNodes.contains(e->source()) && selNodes.contains(e->target()))
+                edges << e;
+        }
+    }
+
+    QVector<Path*> paths;
+    foreach (Edge *e, edges) {
+        Path *p = e->path();
+        if (p && !paths.contains(p)) paths << p;
+    }
+
+    _tikzDocument->undoStack()->push(new SplitPathCommand(this, paths));
 }
 
 void TikzScene::refreshZIndices()
diff --git a/src/gui/undocommands.cpp b/src/gui/undocommands.cpp
index 87d5a13..9771f44 100644
--- a/src/gui/undocommands.cpp
+++ b/src/gui/undocommands.cpp
@@ -667,3 +667,47 @@ void MakePathCommand::redo()
     _scene->refreshZIndices();
     GraphUpdateCommand::redo();
 }
+
+SplitPathCommand::SplitPathCommand(TikzScene *scene,
+                                   const QVector<Path *> &paths,
+                                   QUndoCommand *parent) :
+    GraphUpdateCommand(scene, parent), _paths(paths)
+{
+    foreach (Path *p, paths) _edgeLists << p->edges();
+}
+
+void SplitPathCommand::undo()
+{
+    for (int i = 0; i < _paths.length(); ++i) {
+        Path *p = _paths[i];
+        foreach (Edge *e, _edgeLists[i]) {
+            p->addEdge(e);
+        }
+
+        _scene->graph()->addPath(p);
+
+        PathItem *pi = new PathItem(p);
+        _scene->addItem(pi);
+        _scene->pathItems().insert(p, pi);
+        pi->readPos();
+    }
+
+    _scene->refreshZIndices();
+    GraphUpdateCommand::undo();
+}
+
+void SplitPathCommand::redo()
+{
+    foreach (Path *p, _paths) {
+        PathItem *pi = _scene->pathItems()[p];
+        _scene->removeItem(pi);
+        _scene->pathItems().remove(p);
+        delete pi;
+
+        p->removeEdges();
+        _scene->graph()->removePath(p);
+    }
+
+    _scene->refreshZIndices();
+    GraphUpdateCommand::redo();
+}
diff --git a/src/gui/undocommands.h b/src/gui/undocommands.h
index a1daa07..00b9a40 100644
--- a/src/gui/undocommands.h
+++ b/src/gui/undocommands.h
@@ -271,4 +271,19 @@ private:
     QMap<Edge*,GraphElementData*> _oldEdgeData;
 };
 
+class SplitPathCommand : public GraphUpdateCommand
+{
+public:
+    explicit SplitPathCommand(TikzScene *scene,
+                              const QVector<Path*> &paths,
+                              QUndoCommand *parent = nullptr);
+    void undo() override;
+    void redo() override;
+private:
+    QVector<Path*> _paths;
+
+    // keep a copy of the edge lists so they can be added back to each path in undo()
+    QVector<QVector<Edge*>> _edgeLists;
+};
+
 #endif // UNDOCOMMANDS_H
-- 
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