Do not send `textDocument/didSave` message if server does not declare its support (#14412)

Kirill Bulatov created 2 years ago

Release Notes:

- Improved Zed logic for sending `textDocument/didSave` request
([14286](https://github.com/zed-industries/zed/issues/14286))

Change summary

crates/lsp/src/lsp.rs               |  4 ++
crates/project/src/project.rs       | 59 ++++++++++++++++++------------
crates/project/src/project_tests.rs | 12 ++++++
3 files changed, 52 insertions(+), 23 deletions(-)

Detailed changes

crates/lsp/src/lsp.rs

@@ -658,6 +658,10 @@ impl LanguageServer {
                         }),
                         ..SignatureHelpClientCapabilities::default()
                     }),
+                    synchronization: Some(TextDocumentSyncClientCapabilities {
+                        did_save: Some(true),
+                        ..TextDocumentSyncClientCapabilities::default()
+                    }),
                     ..TextDocumentClientCapabilities::default()
                 }),
                 experimental: Some(json!({

crates/project/src/project.rs

@@ -2547,15 +2547,21 @@ impl Project {
                 };
 
                 for (_, _, server) in self.language_servers_for_worktree(worktree_id) {
-                    let text = include_text(server.as_ref()).then(|| buffer.read(cx).text());
-                    server
-                        .notify::<lsp::notification::DidSaveTextDocument>(
-                            lsp::DidSaveTextDocumentParams {
-                                text_document: text_document.clone(),
-                                text,
-                            },
-                        )
-                        .log_err();
+                    if let Some(include_text) = include_text(server.as_ref()) {
+                        let text = if include_text {
+                            Some(buffer.read(cx).text())
+                        } else {
+                            None
+                        };
+                        server
+                            .notify::<lsp::notification::DidSaveTextDocument>(
+                                lsp::DidSaveTextDocumentParams {
+                                    text_document: text_document.clone(),
+                                    text,
+                                },
+                            )
+                            .log_err();
+                    }
                 }
 
                 for language_server_id in self.language_server_ids_for_buffer(buffer.read(cx), cx) {
@@ -11179,20 +11185,27 @@ impl Completion {
     }
 }
 
-fn include_text(server: &lsp::LanguageServer) -> bool {
-    server
-        .capabilities()
-        .text_document_sync
-        .as_ref()
-        .and_then(|sync| match sync {
-            lsp::TextDocumentSyncCapability::Kind(_) => None,
-            lsp::TextDocumentSyncCapability::Options(options) => options.save.as_ref(),
-        })
-        .and_then(|save_options| match save_options {
-            lsp::TextDocumentSyncSaveOptions::Supported(_) => None,
-            lsp::TextDocumentSyncSaveOptions::SaveOptions(options) => options.include_text,
-        })
-        .unwrap_or(false)
+fn include_text(server: &lsp::LanguageServer) -> Option<bool> {
+    match server.capabilities().text_document_sync.as_ref()? {
+        lsp::TextDocumentSyncCapability::Kind(kind) => match kind {
+            &lsp::TextDocumentSyncKind::NONE => None,
+            &lsp::TextDocumentSyncKind::FULL => Some(true),
+            &lsp::TextDocumentSyncKind::INCREMENTAL => Some(false),
+            _ => None,
+        },
+        lsp::TextDocumentSyncCapability::Options(options) => match options.save.as_ref()? {
+            lsp::TextDocumentSyncSaveOptions::Supported(supported) => {
+                if *supported {
+                    Some(true)
+                } else {
+                    None
+                }
+            }
+            lsp::TextDocumentSyncSaveOptions::SaveOptions(save_options) => {
+                Some(save_options.include_text.unwrap_or(false))
+            }
+        },
+    }
 }
 
 async fn load_direnv_environment(dir: &Path) -> Result<Option<HashMap<String, String>>> {

crates/project/src/project_tests.rs

@@ -322,6 +322,12 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
                     trigger_characters: Some(vec![".".to_string(), "::".to_string()]),
                     ..Default::default()
                 }),
+                text_document_sync: Some(lsp::TextDocumentSyncCapability::Options(
+                    lsp::TextDocumentSyncOptions {
+                        save: Some(lsp::TextDocumentSyncSaveOptions::Supported(true)),
+                        ..Default::default()
+                    },
+                )),
                 ..Default::default()
             },
             ..Default::default()
@@ -336,6 +342,12 @@ async fn test_managing_language_servers(cx: &mut gpui::TestAppContext) {
                     trigger_characters: Some(vec![":".to_string()]),
                     ..Default::default()
                 }),
+                text_document_sync: Some(lsp::TextDocumentSyncCapability::Options(
+                    lsp::TextDocumentSyncOptions {
+                        save: Some(lsp::TextDocumentSyncSaveOptions::Supported(true)),
+                        ..Default::default()
+                    },
+                )),
                 ..Default::default()
             },
             ..Default::default()