From 76c1160ffa626fc5f07b309420e6666eb79a3311 Mon Sep 17 00:00:00 2001
From: veetaha <veetaha2@gmail.com>
Date: Sun, 10 May 2020 18:35:33 +0300
Subject: Migrate flycheck to fully-lsp-compatible progress reports (introduce
 ra_progress crate)

---
 crates/ra_flycheck/src/lib.rs | 62 +++++++++++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 23 deletions(-)

(limited to 'crates/ra_flycheck/src')

diff --git a/crates/ra_flycheck/src/lib.rs b/crates/ra_flycheck/src/lib.rs
index 6c4170529..7b9f48eb0 100644
--- a/crates/ra_flycheck/src/lib.rs
+++ b/crates/ra_flycheck/src/lib.rs
@@ -3,6 +3,7 @@
 //! LSP diagnostics based on the output of the command.
 
 use std::{
+    fmt,
     io::{self, BufReader},
     path::PathBuf,
     process::{Command, Stdio},
@@ -16,6 +17,9 @@ pub use cargo_metadata::diagnostic::{
     Applicability, Diagnostic, DiagnosticLevel, DiagnosticSpan, DiagnosticSpanMacroExpansion,
 };
 
+type Progress = ra_progress::Progress<(), String>;
+type ProgressSource = ra_progress::ProgressSource<(), String>;
+
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum FlycheckConfig {
     CargoCommand {
@@ -31,6 +35,17 @@ pub enum FlycheckConfig {
     },
 }
 
+impl fmt::Display for FlycheckConfig {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            FlycheckConfig::CargoCommand { command, .. } => write!(f, "cargo {}", command),
+            FlycheckConfig::CustomCommand { command, args } => {
+                write!(f, "{} {}", command, args.join(" "))
+            }
+        }
+    }
+}
+
 /// Flycheck wraps the shared state and communication machinery used for
 /// running `cargo check` (or other compatible command) and providing
 /// diagnostics based on the output.
@@ -44,11 +59,15 @@ pub struct Flycheck {
 }
 
 impl Flycheck {
-    pub fn new(config: FlycheckConfig, workspace_root: PathBuf) -> Flycheck {
+    pub fn new(
+        config: FlycheckConfig,
+        workspace_root: PathBuf,
+        progress_src: ProgressSource,
+    ) -> Flycheck {
         let (task_send, task_recv) = unbounded::<CheckTask>();
         let (cmd_send, cmd_recv) = unbounded::<CheckCommand>();
         let handle = jod_thread::spawn(move || {
-            FlycheckThread::new(config, workspace_root).run(&task_send, &cmd_recv);
+            FlycheckThread::new(config, workspace_root, progress_src).run(&task_send, &cmd_recv);
         });
         Flycheck { task_recv, cmd_send, handle }
     }
@@ -66,16 +85,6 @@ pub enum CheckTask {
 
     /// Request adding a diagnostic with fixes included to a file
     AddDiagnostic { workspace_root: PathBuf, diagnostic: Diagnostic },
-
-    /// Request check progress notification to client
-    Status(Status),
-}
-
-#[derive(Debug)]
-pub enum Status {
-    Being,
-    Progress(String),
-    End,
 }
 
 pub enum CheckCommand {
@@ -87,6 +96,8 @@ struct FlycheckThread {
     config: FlycheckConfig,
     workspace_root: PathBuf,
     last_update_req: Option<Instant>,
+    progress_src: ProgressSource,
+    progress: Option<Progress>,
     // XXX: drop order is significant
     message_recv: Receiver<CheckEvent>,
     /// WatchThread exists to wrap around the communication needed to be able to
@@ -98,11 +109,17 @@ struct FlycheckThread {
 }
 
 impl FlycheckThread {
-    fn new(config: FlycheckConfig, workspace_root: PathBuf) -> FlycheckThread {
+    fn new(
+        config: FlycheckConfig,
+        workspace_root: PathBuf,
+        progress_src: ProgressSource,
+    ) -> FlycheckThread {
         FlycheckThread {
             config,
             workspace_root,
+            progress_src,
             last_update_req: None,
+            progress: None,
             message_recv: never(),
             check_process: None,
         }
@@ -140,9 +157,9 @@ impl FlycheckThread {
         }
     }
 
-    fn clean_previous_results(&self, task_send: &Sender<CheckTask>) {
+    fn clean_previous_results(&mut self, task_send: &Sender<CheckTask>) {
         task_send.send(CheckTask::ClearDiagnostics).unwrap();
-        task_send.send(CheckTask::Status(Status::End)).unwrap();
+        self.progress = None;
     }
 
     fn should_recheck(&mut self) -> bool {
@@ -161,18 +178,17 @@ impl FlycheckThread {
         }
     }
 
-    fn handle_message(&self, msg: CheckEvent, task_send: &Sender<CheckTask>) {
+    fn handle_message(&mut self, msg: CheckEvent, task_send: &Sender<CheckTask>) {
         match msg {
             CheckEvent::Begin => {
-                task_send.send(CheckTask::Status(Status::Being)).unwrap();
+                self.progress = Some(self.progress_src.begin(()));
             }
-
-            CheckEvent::End => {
-                task_send.send(CheckTask::Status(Status::End)).unwrap();
-            }
-
+            CheckEvent::End => self.progress = None,
             CheckEvent::Msg(Message::CompilerArtifact(msg)) => {
-                task_send.send(CheckTask::Status(Status::Progress(msg.target.name))).unwrap();
+                self.progress
+                    .as_mut()
+                    .expect("check process reported progress without the 'Begin' notification")
+                    .report(msg.target.name);
             }
 
             CheckEvent::Msg(Message::CompilerMessage(msg)) => {
-- 
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