logic: using source folders for header search

* adding folders form source paths to header search paths for convenience. We are using system header search paths here so that users can also use "<..>" in their includes.

src/lib/CxxProject.cpp

@@ -96,9 +96,14 @@ Parser::Arguments CxxProject::getParserArguments() const
 
 	utility::append(args.compilerFlags, m_projectSettings->getCompilerFlags());
 
-	// MAYBE DO THIS IN PARSER! AND ONLY ADD THE PATH OF THE CURRENT FILE!!
 	// Add the source paths as HeaderSearchPaths as well, so clang will also look here when searching include files.
-	//utility::append(args.systemHeaderSearchPaths, m_fileManager.getSourcePaths());
+	for (const FilePath& sourcePath: getSourcePaths())
+	{
+		if (sourcePath.isDirectory())
+		{
+			args.systemHeaderSearchPaths.push_back(sourcePath);
+		}
+	}
 
 	utility::append(args.systemHeaderSearchPaths, m_projectSettings->getAbsoluteHeaderSearchPaths());
 

src/lib/Project.cpp

@@ -187,6 +187,11 @@ DialogView* Project::getDialogView() const
 	return m_dialogView;
 }
 
+const std::vector<FilePath>& Project::getSourcePaths() const
+{
+	return m_fileManager.getSourcePaths();
+}
+
 void Project::load()
 {
 	m_storageAccessProxy->setSubject(nullptr);

src/lib/Project.h

@@ -38,6 +38,7 @@ public:
 protected:
 	Project(StorageAccessProxy* storageAccessProxy, DialogView* dialogView);
 	DialogView* getDialogView() const;
+	const std::vector<FilePath>& getSourcePaths() const;
 
 	virtual std::shared_ptr<ProjectSettings> getProjectSettings() = 0;
 	virtual const std::shared_ptr<ProjectSettings> getProjectSettings() const = 0;