11 files changed, 70 insertions, 0 deletions

diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index b75dfa0d3..2c0da0665 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -184,6 +184,8 @@ To see logs from the language server, set `RUST_LOG=info` env variable. To see
 all communication between the server and the client, use
 `RUST_LOG=gen_lsp_server=debug` (this will print quite a bit of stuff).
 
+There's `Status of rust-analyzer` command which prints common high-level debug info.
+
 To run tests, just `cargo test`.
 
 To work on the VS Code extension, launch code inside `editors/code` and use `F5` to
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index a09a8f926..3c53e75ac 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -15,6 +15,7 @@ pub mod mock_analysis;
 mod symbol_index;
 mod navigation_target;
 
+mod status;
 mod completion;
 mod runnables;
 mod goto_definition;
@@ -293,6 +294,11 @@ pub struct Analysis {
 }
 
 impl Analysis {
+    /// Debug info about the current state of the analysis
+    pub fn status(&self) -> String {
+        status::status(&*self.db)
+    }
+
     /// Gets the text of the source file.
     pub fn file_text(&self, file_id: FileId) -> Arc<String> {
         self.db.file_text(file_id)
diff --git a/crates/ra_ide_api/src/status.rs b/crates/ra_ide_api/src/status.rs
new file mode 100644
index 000000000..d3e04be23
--- /dev/null
+++ b/crates/ra_ide_api/src/status.rs
@@ -0,0 +1,15 @@
+use ra_db::{
+    LocationIntener, SourceFileQuery,
+    salsa::{Database, debug::DebugQueryTable},
+};
+
+use crate::db::RootDatabase;
+
+pub(crate) fn status(db: &RootDatabase) -> String {
+    let n_parsed_files = db.query(SourceFileQuery).keys::<Vec<_>>().len();
+    let n_defs = {
+        let interner: &LocationIntener<hir::DefLoc, hir::DefId> = db.as_ref();
+        interner.len()
+    };
+    format!("#n_parsed_files {}\n#n_defs {}\n", n_parsed_files, n_defs)
+}
diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index fa07b1942..f51576521 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -285,6 +285,7 @@ fn on_request(
         sender,
     };
     let req = pool_dispatcher
+        .on::<req::AnalyzerStatus>(handlers::handle_analyzer_status)?
         .on::<req::SyntaxTree>(handlers::handle_syntax_tree)?
         .on::<req::ExtendSelection>(handlers::handle_extend_selection)?
         .on::<req::FindMatchingBrace>(handlers::handle_find_matching_brace)?
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index 497f819be..d84f762f4 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -23,6 +23,10 @@ use crate::{
     LspError, Result,
 };
 
+pub fn handle_analyzer_status(world: ServerWorld, _: ()) -> Result<String> {
+    Ok(world.status())
+}
+
 pub fn handle_syntax_tree(world: ServerWorld, params: req::SyntaxTreeParams) -> Result<String> {
     let id = params.text_document.try_conv_with(&world)?;
     let res = world.analysis().syntax_tree(id);
diff --git a/crates/ra_lsp_server/src/req.rs b/crates/ra_lsp_server/src/req.rs
index 156cf9641..ec6b6d905 100644
--- a/crates/ra_lsp_server/src/req.rs
+++ b/crates/ra_lsp_server/src/req.rs
@@ -11,6 +11,14 @@ pub use lsp_types::{
     TextDocumentPositionParams, TextEdit, WorkspaceEdit, WorkspaceSymbolParams,
 };
 
+pub enum AnalyzerStatus {}
+
+impl Request for AnalyzerStatus {
+    type Params = ();
+    type Result = String;
+    const METHOD: &'static str = "ra/analyzerStatus";
+}
+
 pub enum SyntaxTree {}
 
 impl Request for SyntaxTree {
diff --git a/crates/ra_lsp_server/src/server_world.rs b/crates/ra_lsp_server/src/server_world.rs
index c24ded9f9..5cb97b29b 100644
--- a/crates/ra_lsp_server/src/server_world.rs
+++ b/crates/ra_lsp_server/src/server_world.rs
@@ -264,4 +264,19 @@ impl ServerWorld {
             .map_err(|_| format_err!("can't convert path to url: {}", path.display()))?;
         Ok(url)
     }
+
+    pub fn status(&self) -> String {
+        let mut res = String::new();
+        if self.workspaces.is_empty() {
+            res.push_str("no workspaces\n")
+        } else {
+            res.push_str("workspaces:\n");
+            for w in self.workspaces.iter() {
+                res += &format!("{} packages loaded\n", w.cargo.packages().count());
+            }
+        }
+        res.push_str("\nanalysis:\n");
+        res.push_str(&self.analysis.status());
+        res
+    }
 }
diff --git a/editors/code/package.json b/editors/code/package.json
index 9433bd3d2..3e07032c7 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -94,6 +94,10 @@
             {
                 "command": "ra-lsp.run",
                 "title": "Rust Run"
+            },
+            {
+                "command": "ra-lsp.analyzerStatus",
+                "title": "Status of rust-analyzer (debug)"
             }
         ],
         "keybindings": [
diff --git a/editors/code/src/commands/analyzer_status.ts b/editors/code/src/commands/analyzer_status.ts
new file mode 100644
index 000000000..5c56b9c4c
--- /dev/null
+++ b/editors/code/src/commands/analyzer_status.ts
@@ -0,0 +1,12 @@
+import * as vscode from 'vscode';
+import { Server } from '../server';
+
+// Shows status of rust-analyzer (for debugging)
+export async function handle() {
+    const status = await Server.client.sendRequest<string>(
+        'ra/analyzerStatus',
+        null
+    );
+    const doc = await vscode.workspace.openTextDocument({ content: status });
+    await vscode.window.showTextDocument(doc, vscode.ViewColumn.Two);
+}
diff --git a/editors/code/src/commands/index.ts b/editors/code/src/commands/index.ts
index 33e2b34a2..f36c4b040 100644
--- a/editors/code/src/commands/index.ts
+++ b/editors/code/src/commands/index.ts
@@ -1,3 +1,4 @@
+import * as analyzerStatus from './analyzer_status';
 import * as applySourceChange from './apply_source_change';
 import * as extendSelection from './extend_selection';
 import * as joinLines from './join_lines';
@@ -8,6 +9,7 @@ import * as runnables from './runnables';
 import * as syntaxTree from './syntaxTree';
 
 export {
+    analyzerStatus,
     applySourceChange,
     extendSelection,
     joinLines,
diff --git a/editors/code/src/extension.ts b/editors/code/src/extension.ts
index 0098c9454..288a852aa 100644
--- a/editors/code/src/extension.ts
+++ b/editors/code/src/extension.ts
@@ -45,6 +45,7 @@ export function activate(context: vscode.ExtensionContext) {
     }
 
     // Commands are requests from vscode to the language server
+    registerCommand('ra-lsp.analyzerStatus', commands.analyzerStatus.handle);
     registerCommand('ra-lsp.syntaxTree', commands.syntaxTree.handle);
     registerCommand('ra-lsp.extendSelection', commands.extendSelection.handle);
     registerCommand('ra-lsp.matchingBrace', commands.matchingBrace.handle);