Add support for formatting entire document with rustfmt

Attempting to format a document when rustfmt isn't installed will result
in an error being returned to the frontend. An alternative
implementation would be returning zero replacements.

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_lsp_server/src/caps.rs b/crates/ra_lsp_server/src/caps.rs
index 5f7038f63..8d508a3ba 100644
--- a/crates/ra_lsp_server/src/caps.rs
+++ b/crates/ra_lsp_server/src/caps.rs
@@ -33,7 +33,7 @@ pub fn server_capabilities() -> ServerCapabilities {
         workspace_symbol_provider: Some(true),
         code_action_provider: Some(CodeActionProviderCapability::Simple(true)),
         code_lens_provider: None,
-        document_formatting_provider: None,
+        document_formatting_provider: Some(true),
         document_range_formatting_provider: None,
         document_on_type_formatting_provider: Some(DocumentOnTypeFormattingOptions {
             first_trigger_character: "=".to_string(),