introduce hir debugging infra

This is to make debugging rust-analyzer easier.

The idea is that `dbg!(krate.debug(db))` will print the actual, fuzzy
crate name, instead of precise ID. Debug printing infra is a separate
thing, to make sure that the actual hir doesn't have access to global
information.

Do not use `.debug` for `log::` logging: debugging executes queries,
and might introduce unneded dependencies to the crate graph

2 files changed, 7 insertions, 1 deletions

diff --git a/crates/ra_lsp_server/Cargo.toml b/crates/ra_lsp_server/Cargo.toml
index 46a0f958c..677d81835 100644
--- a/crates/ra_lsp_server/Cargo.toml
+++ b/crates/ra_lsp_server/Cargo.toml
@@ -18,6 +18,7 @@ parking_lot = "0.9.0"
 jod-thread = "0.1.0"
 ra_vfs = "0.4.0"
 ra_syntax = { path = "../ra_syntax" }
+ra_db = { path = "../ra_db" }
 ra_text_edit = { path = "../ra_text_edit" }
 ra_ide_api = { path = "../ra_ide_api" }
 lsp-server = "0.2.0"
diff --git a/crates/ra_lsp_server/src/world.rs b/crates/ra_lsp_server/src/world.rs
index 086ecd587..232409c3b 100644
--- a/crates/ra_lsp_server/src/world.rs
+++ b/crates/ra_lsp_server/src/world.rs
@@ -92,6 +92,7 @@ impl WorldState {
             let vfs_root_path = vfs.root2path(r);
             let is_local = folder_roots.iter().any(|it| vfs_root_path.starts_with(it));
             change.add_root(SourceRootId(r.0), is_local);
+            change.set_debug_root_path(SourceRootId(r.0), vfs_root_path.display().to_string());
         }
 
         // Create crate graph from all the workspaces
@@ -101,7 +102,11 @@ impl WorldState {
             vfs_file.map(|f| FileId(f.0))
         };
         for ws in workspaces.iter() {
-            crate_graph.extend(ws.to_crate_graph(&mut load));
+            let (graph, crate_names) = ws.to_crate_graph(&mut load);
+            let shift = crate_graph.extend(graph);
+            for (crate_id, name) in crate_names {
+                change.set_debug_crate_name(crate_id.shift(shift), name)
+            }
         }
         change.set_crate_graph(crate_graph);