project: use relative filenames if absolute don't exist

app/common/xmlutils.h

@@ -64,6 +64,9 @@ struct XMLNodeData {
   QList<BlockLink> block_links;
   QHash<quintptr, Item*> item_ptrs;
 
+  QString real_project_url;
+  QString saved_project_url;
+
 };
 
 void XMLConnectNodes(const XMLNodeData& xml_node_data, QUndoCommand* command = nullptr);

app/project/item/footage/footage.cpp

@@ -21,6 +21,7 @@
 #include "footage.h"
 
 #include <QCoreApplication>
+#include <QDir>
 
 #include "codec/decoder.h"
 #include "common/xmlutils.h"
@@ -52,6 +53,27 @@ void Footage::Load(QXmlStreamReader *reader, XMLNodeData &xml_node_data, const Q
     }
   }
 
+  // Validate filename
+  if (!QFileInfo::exists(filename_)) {
+    // Absolute filename does not exist, use some heuristics to try relocating the file
+
+    if (xml_node_data.real_project_url != xml_node_data.saved_project_url) {
+      // Project path has changed, check if the file we're looking for is the same relative to the
+      // new project path
+      QDir saved_dir(QFileInfo(xml_node_data.saved_project_url).dir());
+      QDir true_dir(QFileInfo(xml_node_data.real_project_url).dir());
+
+      QString relative_filename = saved_dir.relativeFilePath(filename_);
+      QString transformed_abs_filename = true_dir.filePath(relative_filename);
+
+      if (QFileInfo::exists(transformed_abs_filename)) {
+        // Use this file instead
+        qInfo() << "Footage" << filename_ << "doesn't exist, using relative file" << transformed_abs_filename;
+        set_filename(transformed_abs_filename);
+      }
+    }
+  }
+
   Decoder::ProbeMedia(this, cancelled);
 
   while (XMLReadNextStartElement(reader)) {

app/project/project.cpp

@@ -41,6 +41,9 @@ void Project::Load(QXmlStreamReader *reader, MainWindowLayoutInfo* layout, const
 {
   XMLNodeData xml_node_data;
 
+  // Set project filename (hacky)
+  xml_node_data.real_project_url = static_cast<QFile*>(reader->device())->fileName();
+
   while (XMLReadNextStartElement(reader)) {
     if (reader->name() == QStringLiteral("folder")) {
 
@@ -69,8 +72,16 @@ void Project::Load(QXmlStreamReader *reader, MainWindowLayoutInfo* layout, const
 
       *layout = MainWindowLayoutInfo::fromXml(reader, xml_node_data);
 
+    } else if (reader->name() == QStringLiteral("url")) {
+
+      // This should be read in before most other elements
+      xml_node_data.saved_project_url = reader->readElementText();
+
     } else {
+
+      // Skip this
       reader->skipCurrentElement();
+
     }
   }