build: Provide AppImage package for Linux (issue #279) (#945)

* Create AppImage package using linuxdeployqt in Travis CI
* Renamed appPath() to sharedDataPath()
* Fixed include error in tutorial

src/lib/app/paths/AppPath.cpp

@@ -1,17 +1,43 @@
 #include "AppPath.h"
 
-FilePath AppPath::m_appPath(L"");
+FilePath AppPath::m_sharedDataPath(L"");
+FilePath AppPath::m_cxxIndexerPath(L"");
 
-FilePath AppPath::getAppPath()
+FilePath AppPath::getSharedDataPath()
 {
-	return m_appPath;
+	return m_sharedDataPath;
 }
 
-bool AppPath::setAppPath(const FilePath& path)
+bool AppPath::setSharedDataPath(const FilePath& path)
 {
 	if (!path.empty())
 	{
-		m_appPath = path;
+		m_sharedDataPath = path;
+		return true;
+	}
+	return false;
+}
+
+FilePath AppPath::getCxxIndexerPath()
+{
+#if _WIN32
+const std::wstring cxxIndexerName(L"sourcetrail_indexer.exe");
+#else
+const std::wstring cxxIndexerName(L"sourcetrail_indexer");
+#endif
+
+	if (!m_cxxIndexerPath.empty())
+	{
+		return m_cxxIndexerPath.getConcatenated(cxxIndexerName);
+	}
+	return m_sharedDataPath.getConcatenated(cxxIndexerName);
+}
+
+bool AppPath::setCxxIndexerPath(const FilePath& path)
+{
+	if (!path.empty())
+	{
+		m_cxxIndexerPath = path;
 		return true;
 	}
 	return false;

src/lib/app/paths/AppPath.h

@@ -6,11 +6,15 @@
 class AppPath
 {
 public:
-	static FilePath getAppPath();
-	static bool setAppPath(const FilePath& path);
+	static FilePath getSharedDataPath();
+	static bool setSharedDataPath(const FilePath& path);
+
+	static FilePath getCxxIndexerPath();
+	static bool setCxxIndexerPath(const FilePath& path);
 
 private:
-	static FilePath m_appPath;
+	static FilePath m_sharedDataPath;
+	static FilePath m_cxxIndexerPath;
 };
 
 #endif	  // APP_PATH_H

src/lib/app/paths/ResourcePaths.cpp

@@ -4,45 +4,45 @@
 
 FilePath ResourcePaths::getColorSchemesPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/color_schemes/");
+	return AppPath::getSharedDataPath().concatenate(L"data/color_schemes/");
 }
 
 FilePath ResourcePaths::getSyntaxHighlightingRulesPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/syntax_highlighting_rules/");
+	return AppPath::getSharedDataPath().concatenate(L"data/syntax_highlighting_rules/");
 }
 
 FilePath ResourcePaths::getFallbackPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/fallback/");
+	return AppPath::getSharedDataPath().concatenate(L"data/fallback/");
 }
 
 FilePath ResourcePaths::getFontsPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/fonts/");
+	return AppPath::getSharedDataPath().concatenate(L"data/fonts/");
 }
 
 FilePath ResourcePaths::getGuiPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/gui/");
+	return AppPath::getSharedDataPath().concatenate(L"data/gui/");
 }
 
 FilePath ResourcePaths::getLicensePath()
 {
-	return AppPath::getAppPath().concatenate(L"data/license/");
+	return AppPath::getSharedDataPath().concatenate(L"data/license/");
 }
 
 FilePath ResourcePaths::getJavaPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/java/");
+	return AppPath::getSharedDataPath().concatenate(L"data/java/");
 }
 
 FilePath ResourcePaths::getPythonPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/python/");
+	return AppPath::getSharedDataPath().concatenate(L"data/python/");
 }
 
 FilePath ResourcePaths::getCxxCompilerHeaderPath()
 {
-	return AppPath::getAppPath().concatenate(L"data/cxx/include/").getCanonical();
+	return AppPath::getSharedDataPath().concatenate(L"data/cxx/include/").getCanonical();
 }

src/lib/data/indexer/TaskBuildIndex.cpp

@@ -13,13 +13,6 @@
 #include "UserPaths.h"
 #include "utilityApp.h"
 
-
-#if _WIN32
-const std::wstring TaskBuildIndex::s_processName(L"sourcetrail_indexer.exe");
-#else
-const std::wstring TaskBuildIndex::s_processName(L"sourcetrail_indexer");
-#endif
-
 TaskBuildIndex::TaskBuildIndex(
 	size_t processCount,
 	std::shared_ptr<StorageProvider> storageProvider,
@@ -185,7 +178,7 @@ void TaskBuildIndex::handleMessage(MessageIndexingInterrupted* message)
 
 void TaskBuildIndex::runIndexerProcess(int processId, const std::wstring& logFilePath)
 {
-	const FilePath indexerProcessPath = AppPath::getAppPath().concatenate(s_processName);
+	const FilePath indexerProcessPath = AppPath::getCxxIndexerPath();
 	if (!indexerProcessPath.exists())
 	{
 		m_interrupted = true;
@@ -199,7 +192,7 @@ void TaskBuildIndex::runIndexerProcess(int processId, const std::wstring& logFil
 	std::vector<std::wstring> commandArguments;
 	commandArguments.push_back(std::to_wstring(processId));
 	commandArguments.push_back(utility::decodeFromUtf8(m_appUUID));
-	commandArguments.push_back(L"\"" + AppPath::getAppPath().getAbsolute().wstr() + L"\"");
+	commandArguments.push_back(L"\"" + AppPath::getSharedDataPath().getAbsolute().wstr() + L"\"");
 	commandArguments.push_back(L"\"" + UserPaths::getUserDataPath().getAbsolute().wstr() + L"\"");
 
 	if (!logFilePath.empty())