move crate to code_model_api

crates/ra_hir/src/code_model_impl.rs

@@ -0,0 +1,34 @@
+use ra_db::{CrateId, Cancelable};
+
+use crate::{Module, HirFileId, db::HirDatabase, Crate, CrateDependency, AsName};
+
+impl Crate {
+    pub(crate) fn new(crate_id: CrateId) -> Crate {
+        Crate { crate_id }
+    }
+    pub(crate) fn dependencies_impl(&self, db: &impl HirDatabase) -> Vec<CrateDependency> {
+        let crate_graph = db.crate_graph();
+        crate_graph
+            .dependencies(self.crate_id)
+            .map(|dep| {
+                let krate = Crate::new(dep.crate_id());
+                let name = dep.as_name();
+                CrateDependency { krate, name }
+            })
+            .collect()
+    }
+    pub(crate) fn root_module_impl(&self, db: &impl HirDatabase) -> Cancelable<Option<Module>> {
+        let crate_graph = db.crate_graph();
+        let file_id = crate_graph.crate_root(self.crate_id);
+        let source_root_id = db.file_source_root(file_id);
+        let file_id = HirFileId::from(file_id);
+        let module_tree = db.module_tree(source_root_id)?;
+        // FIXME: teach module tree about crate roots instead of guessing
+        let (module_id, _) = ctry!(module_tree
+            .modules_with_sources()
+            .find(|(_, src)| src.file_id() == file_id));
+
+        let module = Module::new(db, source_root_id, module_id)?;
+        Ok(Some(module))
+    }
+}