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.

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(),

crates/ra_lsp_server/src/main_loop.rs

@@ -295,6 +295,7 @@ fn on_request(
         .on::<req::PrepareRenameRequest>(handlers::handle_prepare_rename)?
         .on::<req::Rename>(handlers::handle_rename)?
         .on::<req::References>(handlers::handle_references)?
+        .on::<req::Formatting>(handlers::handle_formatting)?
         .finish();
     match req {
         Ok(id) => {

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -6,13 +6,16 @@ use languageserver_types::{
     DiagnosticSeverity, DocumentSymbol, Documentation, FoldingRange, FoldingRangeKind,
     FoldingRangeParams, Location, MarkupContent, MarkupKind, MarkedString, Position,
     PrepareRenameResponse, RenameParams, SymbolInformation, TextDocumentIdentifier, TextEdit,
+    Range,
     WorkspaceEdit, ParameterInformation, ParameterLabel, SignatureInformation, Hover, HoverContents,
+    DocumentFormattingParams,
 };
 use ra_analysis::{FileId, FoldKind, Query, RunnableKind, FileRange, FilePosition, Severity};
 use ra_syntax::{TextUnit, text_utils::intersect};
 use ra_text_edit::text_utils::contains_offset_nonstrict;
 use rustc_hash::FxHashMap;
 use serde_json::to_value;
+use std::io::Write;
 
 use crate::{
     conv::{to_location, Conv, ConvWith, MapConvWith, TryConvWith},
@@ -601,6 +604,36 @@ pub fn handle_references(
     ))
 }
 
+pub fn handle_formatting(
+    world: ServerWorld,
+    params: DocumentFormattingParams,
+) -> Result<Option<Vec<TextEdit>>> {
+    let file_id = params.text_document.try_conv_with(&world)?;
+    let file = world.analysis().file_text(file_id);
+
+    let file_line_index = world.analysis().file_line_index(file_id);
+    let end_position = TextUnit::of_str(&file).conv_with(&file_line_index);
+
+    use std::process;
+    let mut rustfmt = process::Command::new("rustfmt")
+        .stdin(process::Stdio::piped())
+        .stdout(process::Stdio::piped())
+        .spawn()?;
+
+    rustfmt.stdin.as_mut().unwrap().write_all(file.as_bytes())?;
+
+    let output = rustfmt.wait_with_output()?;
+    let captured_stdout = String::from_utf8(output.stdout)?;
+    if !output.status.success() {
+        return Err(failure::err_msg(captured_stdout));
+    }
+
+    Ok(Some(vec![TextEdit {
+        range: Range::new(Position::new(0, 0), end_position),
+        new_text: captured_stdout,
+    }]))
+}
+
 pub fn handle_code_action(
     world: ServerWorld,
     params: req::CodeActionParams,