5 files changed, 151 insertions, 29 deletions

diff --git a/crates/ra_lsp_server/src/caps.rs b/crates/ra_lsp_server/src/caps.rs
index db502c200..c4711076c 100644
--- a/crates/ra_lsp_server/src/caps.rs
+++ b/crates/ra_lsp_server/src/caps.rs
@@ -1,8 +1,8 @@
 //! Advertizes the capabilities of the LSP Server.
 
 use lsp_types::{
-    CodeActionProviderCapability, CodeLensOptions, CompletionOptions,
-    DocumentOnTypeFormattingOptions, FoldingRangeProviderCapability,
+    CallHierarchyServerCapability, CodeActionProviderCapability, CodeLensOptions,
+    CompletionOptions, DocumentOnTypeFormattingOptions, FoldingRangeProviderCapability,
     ImplementationProviderCapability, RenameOptions, RenameProviderCapability, SaveOptions,
     SelectionRangeProviderCapability, ServerCapabilities, SignatureHelpOptions,
     TextDocumentSyncCapability, TextDocumentSyncKind, TextDocumentSyncOptions,
@@ -56,7 +56,7 @@ pub fn server_capabilities() -> ServerCapabilities {
         color_provider: None,
         execute_command_provider: None,
         workspace: None,
-        call_hierarchy_provider: None,
+        call_hierarchy_provider: Some(CallHierarchyServerCapability::Simple(true)),
         experimental: Default::default(),
     }
 }
diff --git a/crates/ra_lsp_server/src/conv.rs b/crates/ra_lsp_server/src/conv.rs
index e93d4ea33..c260b51c4 100644
--- a/crates/ra_lsp_server/src/conv.rs
+++ b/crates/ra_lsp_server/src/conv.rs
@@ -490,6 +490,24 @@ impl TryConvWith<&WorldSnapshot> for (FileId, RangeInfo<Vec<NavigationTarget>>)
     }
 }
 
+pub fn to_call_hierarchy_item(
+    file_id: FileId,
+    range: TextRange,
+    world: &WorldSnapshot,
+    line_index: &LineIndex,
+    nav: NavigationTarget,
+) -> Result<lsp_types::CallHierarchyItem> {
+    Ok(lsp_types::CallHierarchyItem {
+        name: nav.name().to_string(),
+        kind: nav.kind().conv(),
+        tags: None,
+        detail: nav.description().map(|it| it.to_string()),
+        uri: file_id.try_conv_with(&world)?,
+        range: nav.range().conv_with(&line_index),
+        selection_range: range.conv_with(&line_index),
+    })
+}
+
 pub fn to_location(
     file_id: FileId,
     range: TextRange,
diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index 4336583fe..7a49cad86 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -62,6 +62,22 @@ pub fn main_loop(
 
     let mut loop_state = LoopState::default();
     let mut world_state = {
+        let feature_flags = {
+            let mut ff = FeatureFlags::default();
+            for (flag, value) in config.feature_flags {
+                if ff.set(flag.as_str(), value).is_err() {
+                    log::error!("unknown feature flag: {:?}", flag);
+                    show_message(
+                        req::MessageType::Error,
+                        format!("unknown feature flag: {:?}", flag),
+                        &connection.sender,
+                    );
+                }
+            }
+            ff
+        };
+        log::info!("feature_flags: {:#?}", feature_flags);
+
         // FIXME: support dynamic workspace loading.
         let workspaces = {
             let mut loaded_workspaces = Vec::new();
@@ -75,7 +91,12 @@ pub fn main_loop(
                     Ok(workspace) => loaded_workspaces.push(workspace),
                     Err(e) => {
                         log::error!("loading workspace failed: {}", e);
-
+                        if let Some(ra_project_model::CargoTomlNotFoundError(_)) = e.downcast_ref()
+                        {
+                            if !feature_flags.get("notifications.cargo-toml-not-found") {
+                                continue;
+                            }
+                        }
                         show_message(
                             req::MessageType::Error,
                             format!("rust-analyzer failed to load workspace: {}", e),
@@ -136,22 +157,6 @@ pub fn main_loop(
             }
         };
 
-        let feature_flags = {
-            let mut ff = FeatureFlags::default();
-            for (flag, value) in config.feature_flags {
-                if ff.set(flag.as_str(), value).is_err() {
-                    log::error!("unknown feature flag: {:?}", flag);
-                    show_message(
-                        req::MessageType::Error,
-                        format!("unknown feature flag: {:?}", flag),
-                        &connection.sender,
-                    );
-                }
-            }
-            ff
-        };
-        log::info!("feature_flags: {:#?}", feature_flags);
-
         WorldState::new(
             ws_roots,
             workspaces,
@@ -499,6 +504,9 @@ fn on_request(
         .on::<req::Formatting>(handlers::handle_formatting)?
         .on::<req::DocumentHighlightRequest>(handlers::handle_document_highlight)?
         .on::<req::InlayHints>(handlers::handle_inlay_hints)?
+        .on::<req::CallHierarchyPrepare>(handlers::handle_call_hierarchy_prepare)?
+        .on::<req::CallHierarchyIncomingCalls>(handlers::handle_call_hierarchy_incoming)?
+        .on::<req::CallHierarchyOutgoingCalls>(handlers::handle_call_hierarchy_outgoing)?
         .finish();
     Ok(())
 }
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index c8f52eb0e..a5b6f48af 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -5,13 +5,16 @@ use std::{fmt::Write as _, io::Write as _};
 
 use lsp_server::ErrorCode;
 use lsp_types::{
+    CallHierarchyIncomingCall, CallHierarchyIncomingCallsParams, CallHierarchyItem,
+    CallHierarchyOutgoingCall, CallHierarchyOutgoingCallsParams, CallHierarchyPrepareParams,
     CodeAction, CodeActionResponse, CodeLens, Command, CompletionItem, Diagnostic,
     DocumentFormattingParams, DocumentHighlight, DocumentSymbol, FoldingRange, FoldingRangeParams,
     Hover, HoverContents, Location, MarkupContent, MarkupKind, Position, PrepareRenameResponse,
     Range, RenameParams, SymbolInformation, TextDocumentIdentifier, TextEdit, WorkspaceEdit,
 };
 use ra_ide::{
-    AssistId, FileId, FilePosition, FileRange, Query, Runnable, RunnableKind, SearchScope,
+    AssistId, FileId, FilePosition, FileRange, Query, RangeInfo, Runnable, RunnableKind,
+    SearchScope,
 };
 use ra_prof::profile;
 use ra_syntax::{AstNode, SyntaxKind, TextRange, TextUnit};
@@ -21,7 +24,10 @@ use serde_json::to_value;
 
 use crate::{
     cargo_target_spec::{runnable_args, CargoTargetSpec},
-    conv::{to_location, Conv, ConvWith, FoldConvCtx, MapConvWith, TryConvWith, TryConvWithToVec},
+    conv::{
+        to_call_hierarchy_item, to_location, Conv, ConvWith, FoldConvCtx, MapConvWith, TryConvWith,
+        TryConvWithToVec,
+    },
     req::{self, Decoration, InlayHint, InlayHintsParams, InlayKind},
     world::WorldSnapshot,
     LspError, Result,
@@ -936,3 +942,91 @@ pub fn handle_inlay_hints(
         })
         .collect())
 }
+
+pub fn handle_call_hierarchy_prepare(
+    world: WorldSnapshot,
+    params: CallHierarchyPrepareParams,
+) -> Result<Option<Vec<CallHierarchyItem>>> {
+    let _p = profile("handle_call_hierarchy_prepare");
+    let position = params.text_document_position_params.try_conv_with(&world)?;
+    let file_id = position.file_id;
+
+    let nav_info = match world.analysis().call_hierarchy(position)? {
+        None => return Ok(None),
+        Some(it) => it,
+    };
+
+    let line_index = world.analysis().file_line_index(file_id)?;
+    let RangeInfo { range, info: navs } = nav_info;
+    let res = navs
+        .into_iter()
+        .filter(|it| it.kind() == SyntaxKind::FN_DEF)
+        .filter_map(|it| to_call_hierarchy_item(file_id, range, &world, &line_index, it).ok())
+        .collect();
+
+    Ok(Some(res))
+}
+
+pub fn handle_call_hierarchy_incoming(
+    world: WorldSnapshot,
+    params: CallHierarchyIncomingCallsParams,
+) -> Result<Option<Vec<CallHierarchyIncomingCall>>> {
+    let _p = profile("handle_call_hierarchy_incoming");
+    let item = params.item;
+
+    let doc = TextDocumentIdentifier::new(item.uri);
+    let frange: FileRange = (&doc, item.range).try_conv_with(&world)?;
+    let fpos = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
+
+    let call_items = match world.analysis().incoming_calls(fpos)? {
+        None => return Ok(None),
+        Some(it) => it,
+    };
+
+    let mut res = vec![];
+
+    for call_item in call_items.into_iter() {
+        let file_id = call_item.target.file_id();
+        let line_index = world.analysis().file_line_index(file_id)?;
+        let range = call_item.target.range();
+        let item = to_call_hierarchy_item(file_id, range, &world, &line_index, call_item.target)?;
+        res.push(CallHierarchyIncomingCall {
+            from: item,
+            from_ranges: call_item.ranges.iter().map(|it| it.conv_with(&line_index)).collect(),
+        });
+    }
+
+    Ok(Some(res))
+}
+
+pub fn handle_call_hierarchy_outgoing(
+    world: WorldSnapshot,
+    params: CallHierarchyOutgoingCallsParams,
+) -> Result<Option<Vec<CallHierarchyOutgoingCall>>> {
+    let _p = profile("handle_call_hierarchy_outgoing");
+    let item = params.item;
+
+    let doc = TextDocumentIdentifier::new(item.uri);
+    let frange: FileRange = (&doc, item.range).try_conv_with(&world)?;
+    let fpos = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
+
+    let call_items = match world.analysis().outgoing_calls(fpos)? {
+        None => return Ok(None),
+        Some(it) => it,
+    };
+
+    let mut res = vec![];
+
+    for call_item in call_items.into_iter() {
+        let file_id = call_item.target.file_id();
+        let line_index = world.analysis().file_line_index(file_id)?;
+        let range = call_item.target.range();
+        let item = to_call_hierarchy_item(file_id, range, &world, &line_index, call_item.target)?;
+        res.push(CallHierarchyOutgoingCall {
+            to: item,
+            from_ranges: call_item.ranges.iter().map(|it| it.conv_with(&line_index)).collect(),
+        });
+    }
+
+    Ok(Some(res))
+}
diff --git a/crates/ra_lsp_server/src/req.rs b/crates/ra_lsp_server/src/req.rs
index 40edaf677..8098ff31d 100644
--- a/crates/ra_lsp_server/src/req.rs
+++ b/crates/ra_lsp_server/src/req.rs
@@ -6,13 +6,15 @@ use serde::{Deserialize, Serialize};
 
 pub use lsp_types::{
     notification::*, request::*, ApplyWorkspaceEditParams, CodeActionParams, CodeLens,
-    CodeLensParams, CompletionParams, CompletionResponse, DidChangeConfigurationParams,
-    DidChangeWatchedFilesParams, DidChangeWatchedFilesRegistrationOptions,
-    DocumentOnTypeFormattingParams, DocumentSymbolParams, DocumentSymbolResponse,
-    FileSystemWatcher, Hover, InitializeResult, MessageType, ProgressParams, ProgressParamsValue,
-    ProgressToken, PublishDiagnosticsParams, ReferenceParams, Registration, RegistrationParams,
-    SelectionRange, SelectionRangeParams, ShowMessageParams, SignatureHelp, TextDocumentEdit,
-    TextDocumentPositionParams, TextEdit, WorkspaceEdit, WorkspaceSymbolParams,
+    CodeLensParams, CompletionParams, CompletionResponse, DiagnosticTag,
+    DidChangeConfigurationParams, DidChangeWatchedFilesParams,
+    DidChangeWatchedFilesRegistrationOptions, DocumentOnTypeFormattingParams, DocumentSymbolParams,
+    DocumentSymbolResponse, FileSystemWatcher, Hover, InitializeResult, MessageType,
+    PartialResultParams, ProgressParams, ProgressParamsValue, ProgressToken,
+    PublishDiagnosticsParams, ReferenceParams, Registration, RegistrationParams, SelectionRange,
+    SelectionRangeParams, ServerCapabilities, ShowMessageParams, SignatureHelp, SymbolKind,
+    TextDocumentEdit, TextDocumentPositionParams, TextEdit, WorkDoneProgressParams, WorkspaceEdit,
+    WorkspaceSymbolParams,
 };
 
 pub enum AnalyzerStatus {}