WIP: cxx-qt-build: add ability to create qmlls.ini

Author: ahayzen-kdab

crates/cxx-qt-build/src/dir.rs

@@ -88,12 +88,18 @@ pub(crate) fn module_target(module_uri: &QmlUri) -> PathBuf {
 /// TODO: This may conflict if two dependencies are building QML modules with the same name!
 /// We should probably include a lockfile here to avoid this.
 pub(crate) fn module_export(module_uri: &QmlUri) -> Option<PathBuf> {
+    // In contrast to crate_export, we don't need to check for the specific crate here.
+    // QML modules should always be exported.
+    module_export_qml_modules().map(|dir| dir.join(module_uri.as_dirs()))
+}
+
+pub(crate) fn module_export_qml_modules() -> Option<PathBuf> {
     // In contrast to crate_export, we don't need to check for the specific crate here.
     // QML modules should always be exported.
     env::var("CXX_QT_EXPORT_DIR")
         .ok()
         .map(PathBuf::from)
-        .map(|dir| dir.join("qml_modules").join(module_uri.as_dirs()))
+        .map(|dir| dir.join("qml_modules"))
 }
 
 /// The target directory or another directory where we can write files that will be shared

crates/cxx-qt-build/src/lib.rs

@@ -36,6 +36,7 @@ pub use qml_modules::{QmlFile, QmlModule, QmlUri};
 pub use qt_build_utils::MocArguments;
 use qt_build_utils::MocProducts;
 use qt_build_utils::QResources;
+use qt_build_utils::QmlLsIniBuilder;
 use quote::ToTokens;
 use std::{
     collections::HashSet,
@@ -898,6 +899,22 @@ impl CxxQtBuilder {
                 .expect("Could not copy qmldir to export directory");
             }
 
+            // Create a .qmlls.ini file with the build dir set similar to QT_QML_GENERATE_QMLLS_INI
+            if let (Some(qml_modules_dir), Some(manifest_dir)) =
+                (dir::module_export_qml_modules(), dir::manifest())
+            {
+                // TODO: manifest dir is not enough as QML files might be in a parent
+                // so this should likely be an argument given to cxx-qt-build
+                // that optionally exports?
+                let mut file = File::create(manifest_dir.parent().unwrap().join(".qmlls.ini"))
+                    .expect("Could not create qmlls.ini file");
+                QmlLsIniBuilder::new()
+                    .build_dir(qml_modules_dir)
+                    .no_cmake_calls(true)
+                    .write(&mut file)
+                    .expect("Could not write qmlls.ini")
+            }
+
             let module_init_key = qml_module_init_key(&qml_module.uri);
             let private_initializers = [qml_module_registration_files.plugin_init];
             let public_initializer =