From e0a43a159d03a91d8cce07003d427df4f3d6966d Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 16 Aug 2018 13:46:31 +0300
Subject: vscode moves cursor

---
 crates/server/src/main_loop/handlers.rs | 19 ++++++++---------
 crates/server/src/main_loop/mod.rs      | 36 ++++++++++++++++++++-------------
 crates/server/src/req.rs                |  8 ++++++++
 3 files changed, 40 insertions(+), 23 deletions(-)

(limited to 'crates/server/src')

diff --git a/crates/server/src/main_loop/handlers.rs b/crates/server/src/main_loop/handlers.rs
index d7b78b4fa..f25c64c97 100644
--- a/crates/server/src/main_loop/handlers.rs
+++ b/crates/server/src/main_loop/handlers.rs
@@ -6,7 +6,7 @@ use languageserver_types::{
     SymbolInformation, Position,
 };
 use libanalysis::{World, Query};
-use libeditor;
+use libeditor::{self, CursorPosition};
 use libsyntax2::TextUnit;
 use serde_json::{to_value, from_value};
 
@@ -195,7 +195,7 @@ pub fn handle_execute_command(
     world: World,
     path_map: PathMap,
     mut params: req::ExecuteCommandParams,
-) -> Result<req::ApplyWorkspaceEditParams> {
+) -> Result<(req::ApplyWorkspaceEditParams, Option<Position>)> {
     if params.command.as_str() != "apply_code_action" {
         bail!("unknown cmd: {:?}", params.command);
     }
@@ -209,23 +209,24 @@ pub fn handle_execute_command(
     let action_result = match arg.id {
         ActionId::FlipComma => libeditor::flip_comma(&file, arg.offset).map(|f| f()),
         ActionId::AddDerive => libeditor::add_derive(&file, arg.offset).map(|f| f()),
-    };
-    let edit = match action_result {
-        Some(action_result) => action_result.edit,
-        None => bail!("command not applicable"),
-    };
+    }.ok_or_else(|| format_err!("command not applicable"))?;
     let line_index = world.file_line_index(file_id)?;
     let mut changes = HashMap::new();
     changes.insert(
         arg.text_document.uri,
-        edit.conv_with(&line_index),
+        action_result.edit.conv_with(&line_index),
     );
     let edit = WorkspaceEdit {
         changes: Some(changes),
         document_changes: None,
     };
+    let edit = req::ApplyWorkspaceEditParams { edit };
+    let cursor_pos = match action_result.cursor_position {
+        CursorPosition::Same => None,
+        CursorPosition::Offset(offset) => Some(offset.conv_with(&line_index)),
+    };
 
-    Ok(req::ApplyWorkspaceEditParams { edit })
+    Ok((edit, cursor_pos))
 }
 
 #[derive(Serialize, Deserialize)]
diff --git a/crates/server/src/main_loop/mod.rs b/crates/server/src/main_loop/mod.rs
index 4d5dfb437..1fbcc7d1f 100644
--- a/crates/server/src/main_loop/mod.rs
+++ b/crates/server/src/main_loop/mod.rs
@@ -171,21 +171,29 @@ fn on_request(
         let path_map = path_map.clone();
         let sender = sender.clone();
         pool.execute(move || {
-            let task = match handle_execute_command(world, path_map, params) {
-                Ok(req) => match to_value(req) {
-                    Err(e) => Task::Die(e.into()),
-                    Ok(params) => {
-                        let request = RawRequest {
-                            id: 0,
-                            method: <req::ApplyWorkspaceEdit as req::ClientRequest>::METHOD.to_string(),
-                            params,
-                        };
-                        Task::Request(request)
-                    }
-                },
-                Err(e) => Task::Die(e),
+            let (edit, cursor) = match handle_execute_command(world, path_map, params) {
+                Ok(res) => res,
+                Err(e) => return sender.send(Task::Die(e)),
             };
-            sender.send(task)
+            match to_value(edit) {
+                Err(e) => return sender.send(Task::Die(e.into())),
+                Ok(params) => {
+                    let request = RawRequest {
+                        id: 0,
+                        method: <req::ApplyWorkspaceEdit as req::ClientRequest>::METHOD.to_string(),
+                        params,
+                    };
+                    sender.send(Task::Request(request))
+                }
+            }
+            if let Some(cursor) = cursor {
+                let request = RawRequest {
+                    id: 0,
+                    method: <req::MoveCursor as req::ClientRequest>::METHOD.to_string(),
+                    params: to_value(cursor).unwrap(),
+                };
+                sender.send(Task::Request(request))
+            }
         });
         Ok(())
     })?;
diff --git a/crates/server/src/req.rs b/crates/server/src/req.rs
index c3efc7489..73e82150c 100644
--- a/crates/server/src/req.rs
+++ b/crates/server/src/req.rs
@@ -101,3 +101,11 @@ pub struct Decoration {
     pub range: Range,
     pub tag: &'static str
 }
+
+pub enum MoveCursor {}
+
+impl Request for MoveCursor {
+    type Params = Position;
+    type Result = ();
+    const METHOD: &'static str = "m/moveCursor";
+}
-- 
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