deployers: Add WaylandShellIntegrationPluginsDeployer

In order to effectively use the Wayland platform, you must
provide shell integration plugins. Introduce a deployer
for these, and a new environment variable,
EXTRA_WAYLAND_SHELL_INTEGRATION_PLUGINS to specify them.

Author: tdewey-rpi

src/deployers/CMakeLists.txt

@@ -22,6 +22,7 @@ set(CLASSES
     TextToSpeechPluginsDeployer
     TlsBackendsDeployer
     WaylandcompositorPluginsDeployer
+    WaylandShellIntegrationPluginsDeployer
 )
 
 # TODO: CMake <= 3.7 (at least!) doesn't allow for using OBJECT libraries with target_link_libraries

src/deployers/WaylandShellIntegrationPluginsDeployer.cpp

@@ -0,0 +1,38 @@
+// system headers
+#include <filesystem>
+
+// library headers
+#include <linuxdeploy/core/log.h>
+#include <linuxdeploy/util/util.h>
+
+// local headers
+#include "WaylandShellIntegrationPluginsDeployer.h"
+
+using namespace linuxdeploy::plugin::qt;
+using namespace linuxdeploy::core::log;
+
+namespace fs = std::filesystem;
+
+bool WaylandShellIntegrationPluginsDeployer::deploy() {
+    // calling the default code is optional, but it won't hurt for now
+    if (!BasicPluginsDeployer::deploy())
+        return false;
+
+    ldLog() << "Deploying Wayland Shell Integration plugins" << std::endl;
+
+    // always deploy default platform
+    if (!appDir.deployLibrary(qtPluginsPath / "wayland-shell-integration/libxdg-shell.so", appDir.path() / "usr/plugins/wayland-shell-integration/"))
+        return false;
+
+    // deploy Wayland Shell Integration platform plugins, if any
+    const auto* const platformPluginsFromEnvData = getenv("EXTRA_WAYLAND_SHELL_INTEGRATION_PLUGINS");
+    if (platformPluginsFromEnvData != nullptr) {
+        for (const auto& platformToDeploy : linuxdeploy::util::split(std::string(platformPluginsFromEnvData), ';')) {
+            ldLog() << "Deploying extra Wayland Shell Integration plugin: " << platformToDeploy << std::endl;
+            if (!appDir.deployLibrary(qtPluginsPath / "wayland-shell-integration" / platformToDeploy, appDir.path() / "usr/plugins/wayland-shell-integration/"))
+                return false;
+        }
+     }
+
+    return true;
+}

src/deployers/WaylandShellIntegrationPluginsDeployer.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "BasicPluginsDeployer.h"
+
+namespace linuxdeploy {
+    namespace plugin {
+        namespace qt {
+            class WaylandShellIntegrationPluginsDeployer : public BasicPluginsDeployer {
+            public:
+                // we can just use the base class's constructor
+                using BasicPluginsDeployer::BasicPluginsDeployer;
+
+                bool deploy() override;
+            };
+        }
+    }
+}