1 files changed, 101 insertions, 0 deletions
diff --git a/util/wasm/preload/preload_qml_imports.py b/util/wasm/preload/preload_qml_imports.py
new file mode 100755
index 0000000000..9af4fa2a28
--- /dev/null
+++ b/util/wasm/preload/preload_qml_imports.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+# Copyright (C) 2023 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+import os
+import sys
+import subprocess
+import json
+
+# Paths to shared libraries and qml imports on the Qt installation on the web server.
+# "$QTDIR" is replaced by qtloader.js at load time (defaults to "qt"), and makes
+# possible to relocate the application build relative to the Qt build on the web server.
+qt_lib_path = "$QTDIR/lib"
+qt_qml_path = "$QTDIR/qml"
+
+# Path to QML imports on the in-memory file system provided by Emscripten. This script emits
+# preload commands which copies QML imports to this directory. In addition, preload_qt_plugins.py
+# creates (and preloads) a qt.conf file which makes Qt load QML plugins from this location.
+qt_deploy_qml_path = "/qt/qml"
+
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+
+def preload_file(source, destination):
+    preload_files.append({"source": source, "destination": destination})
+
+
+def extract_preload_files_from_imports(imports):
+    libraries = []
+    for qml_import in imports:
+        try:
+            relative_path = qml_import["relativePath"]
+            plugin = qml_import["plugin"]
+
+            # plugin .so
+            plugin_filename = "lib" + plugin + ".so"
+            so_plugin_source_path = os.path.join(
+                qt_qml_path, relative_path, plugin_filename
+            )
+            so_plugin_destination_path = os.path.join(
+                qt_deploy_qml_path, relative_path, plugin_filename
+            )
+
+            preload_file(so_plugin_source_path, so_plugin_destination_path)
+            so_plugin_qt_install_path = os.path.join(
+                qt_wasm_path, "qml", relative_path, plugin_filename
+            )
+
+            # qmldir file
+            qmldir_source_path = os.path.join(qt_qml_path, relative_path, "qmldir")
+            qmldir_destination_path = os.path.join(
+                qt_deploy_qml_path, relative_path, "qmldir"
+            )
+            preload_file(qmldir_source_path, qmldir_destination_path)
+        except Exception as e:
+            eprint(e)
+            continue
+    return libraries
+
+
+if __name__ == "__main__":
+    if len(sys.argv) != 4:
+        print("Usage: python preload_qml_imports.py <qml-source-path> <qt-host-path> <qt-wasm-path>")
+        sys.exit(1)
+
+    qml_source_path = sys.argv[1]
+    qt_host_path = sys.argv[2]
+    qt_wasm_path = sys.argv[3]
+
+    qml_import_path = os.path.join(qt_wasm_path, "qml")
+    qmlimportsscanner_path = os.path.join(qt_host_path, "libexec/qmlimportscanner")
+
+    eprint("runing qmlimportsscanner")
+    command = [qmlimportsscanner_path, "-rootPath", qml_source_path, "-importPath", qml_import_path]
+    result = subprocess.run(command, stdout=subprocess.PIPE)
+    imports = json.loads(result.stdout)
+
+    preload_files = []
+    libraries = extract_preload_files_from_imports(imports)
+
+    # Deploy plugin dependencies, that is, shared libraries used by the plugins.
+    # Skip some of the obvious libraries which will be
+    skip_libraries = [
+        "libQt6Core.so",
+        "libQt6Gui.so",
+        "libQt6Quick.so",
+        "libQt6Qml.so" "libQt6Network.so",
+        "libQt6OpenGL.so",
+    ]
+
+    libraries = set(libraries) - set(skip_libraries)
+    for library in libraries:
+        source = os.path.join(qt_lib_path, library)
+        # Emscripten looks for shared libraries on "/", shared libraries
+        # most be deployed there instead of at /qt/lib
+        destination = os.path.join("/", library)
+        preload_file(source, destination)
+
+    print(json.dumps(preload_files, indent=2))