Remove some unwraps

crates/ra_hir_ty/src/diagnostics.rs

@@ -4,6 +4,7 @@ use std::any::Any;
 
 use hir_expand::{db::AstDatabase, name::Name, HirFileId, InFile};
 use ra_syntax::{ast, AstNode, AstPtr, SyntaxNodePtr};
+use stdx::format_to;
 
 pub use hir_def::diagnostics::UnresolvedModule;
 pub use hir_expand::diagnostics::{AstDiagnostic, Diagnostic, DiagnosticSink};
@@ -37,12 +38,11 @@ pub struct MissingFields {
 
 impl Diagnostic for MissingFields {
     fn message(&self) -> String {
-        use std::fmt::Write;
-        let mut message = String::from("Missing structure fields:\n");
+        let mut buf = String::from("Missing structure fields:\n");
         for field in &self.missed_fields {
-            writeln!(message, "- {}", field).unwrap();
+            format_to!(buf, "- {}", field);
         }
-        message
+        buf
     }
     fn source(&self) -> InFile<SyntaxNodePtr> {
         InFile { file_id: self.file, value: self.field_list.into() }

crates/ra_hir_ty/src/tests.rs

@@ -7,7 +7,6 @@ mod traits;
 mod method_resolution;
 mod macros;
 
-use std::fmt::Write;
 use std::sync::Arc;
 
 use hir_def::{
@@ -26,6 +25,7 @@ use ra_syntax::{
     algo,
     ast::{self, AstNode},
 };
+use stdx::format_to;
 
 use crate::{db::HirDatabase, display::HirDisplay, test_db::TestDB, InferenceResult};
 
@@ -63,7 +63,7 @@ fn infer(ra_fixture: &str) -> String {
 fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
     let (db, file_id) = TestDB::with_single_file(content);
 
-    let mut acc = String::new();
+    let mut buf = String::new();
 
     let mut infer_def = |inference_result: Arc<InferenceResult>,
                          body_source_map: Arc<BodySourceMap>| {
@@ -106,15 +106,14 @@ fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
                 (src_ptr.value.range(), node.text().to_string().replace("\n", " "))
             };
             let macro_prefix = if src_ptr.file_id != file_id.into() { "!" } else { "" };
-            writeln!(
-                acc,
-                "{}{} '{}': {}",
+            format_to!(
+                buf,
+                "{}{} '{}': {}\n",
                 macro_prefix,
                 range,
                 ellipsize(text, 15),
                 ty.display(&db)
-            )
-            .unwrap();
+            );
         }
         if include_mismatches {
             mismatches.sort_by_key(|(src_ptr, _)| {
@@ -123,15 +122,14 @@ fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
             for (src_ptr, mismatch) in &mismatches {
                 let range = src_ptr.value.range();
                 let macro_prefix = if src_ptr.file_id != file_id.into() { "!" } else { "" };
-                writeln!(
-                    acc,
-                    "{}{}: expected {}, got {}",
+                format_to!(
+                    buf,
+                    "{}{}: expected {}, got {}\n",
                     macro_prefix,
                     range,
                     mismatch.expected.display(&db),
                     mismatch.actual.display(&db),
-                )
-                .unwrap();
+                );
             }
         }
     };
@@ -158,8 +156,8 @@ fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
         infer_def(infer, source_map);
     }
 
-    acc.truncate(acc.trim_end().len());
-    acc
+    buf.truncate(buf.trim_end().len());
+    buf
 }
 
 fn visit_module(

crates/ra_ide/src/display.rs

@@ -6,12 +6,13 @@ mod navigation_target;
 mod structure;
 mod short_label;
 
-use std::fmt::{Display, Write};
+use std::fmt::Display;
 
 use ra_syntax::{
     ast::{self, AstNode, AttrsOwner, NameOwner, TypeParamsOwner},
     SyntaxKind::{ATTR, COMMENT},
 };
+use stdx::format_to;
 
 pub use function_signature::FunctionSignature;
 pub use navigation_target::NavigationTarget;
@@ -78,18 +79,18 @@ pub(crate) fn rust_code_markup_with_doc(
     doc: Option<&str>,
     mod_path: Option<&str>,
 ) -> String {
-    let mut markup = "```rust\n".to_owned();
+    let mut buf = "```rust\n".to_owned();
 
     if let Some(mod_path) = mod_path {
         if !mod_path.is_empty() {
-            write!(markup, "{}\n", mod_path).unwrap();
+            format_to!(buf, "{}\n", mod_path);
         }
     }
-    write!(markup, "{}\n```", code).unwrap();
+    format_to!(buf, "{}\n```", code);
 
     if let Some(doc) = doc {
-        write!(markup, "\n\n{}", doc).unwrap();
+        format_to!(buf, "\n\n{}", doc);
     }
 
-    markup
+    buf
 }

crates/rust-analyzer/src/cli/analysis_stats.rs

@@ -1,7 +1,7 @@
 //! Fully type-check project and print various stats, like the number of type
 //! errors.
 
-use std::{collections::HashSet, fmt::Write, path::Path, time::Instant};
+use std::{collections::HashSet, path::Path, time::Instant};
 
 use hir::{
     db::{AstDatabase, DefDatabase, HirDatabase},
@@ -13,6 +13,7 @@ use itertools::Itertools;
 use ra_db::SourceDatabaseExt;
 use ra_syntax::AstNode;
 use rand::{seq::SliceRandom, thread_rng};
+use stdx::format_to;
 
 use crate::cli::{load_cargo::load_cargo, progress_report::ProgressReport, Result, Verbosity};
 
@@ -128,7 +129,7 @@ pub fn analysis_stats(
             let original_file = src.file_id.original_file(db);
             let path = db.file_relative_path(original_file);
             let syntax_range = src.value.syntax().text_range();
-            write!(msg, " ({:?} {})", path, syntax_range).unwrap();
+            format_to!(msg, " ({:?} {})", path, syntax_range);
         }
         if verbosity.is_spammy() {
             bar.println(msg.to_string());

crates/rust-analyzer/src/main_loop/handlers.rs

@@ -3,7 +3,6 @@
 //! `ra_ide` crate.
 
 use std::{
-    fmt::Write as _,
     io::Write as _,
     process::{self, Stdio},
 };
@@ -28,6 +27,7 @@ use ra_syntax::{AstNode, SyntaxKind, TextRange, TextUnit};
 use rustc_hash::FxHashMap;
 use serde::{Deserialize, Serialize};
 use serde_json::to_value;
+use stdx::format_to;
 
 use crate::{
     cargo_target_spec::CargoTargetSpec,
@@ -46,11 +46,11 @@ use crate::{
 pub fn handle_analyzer_status(world: WorldSnapshot, _: ()) -> Result<String> {
     let _p = profile("handle_analyzer_status");
     let mut buf = world.status();
-    writeln!(buf, "\n\nrequests:").unwrap();
+    format_to!(buf, "\n\nrequests:");
     let requests = world.latest_requests.read();
     for (is_last, r) in requests.iter() {
         let mark = if is_last { "*" } else { " " };
-        writeln!(buf, "{}{:4} {:<36}{}ms", mark, r.id, r.method, r.duration.as_millis()).unwrap();
+        format_to!(buf, "{}{:4} {:<36}{}ms", mark, r.id, r.method, r.duration.as_millis());
     }
     Ok(buf)
 }