Merge pull request #3480 from sinkuu/cleanup

Cleanups

src/chains.rs

@@ -550,7 +550,7 @@ impl<'a> ChainFormatterShared<'a> {
         let almost_total = if extendable {
             prev_last_line_width
         } else {
-            self.rewrites.iter().fold(0, |a, b| a + b.len())
+            self.rewrites.iter().map(|a| a.len()).sum()
         } + last.tries;
         let one_line_budget = if self.child_count == 1 {
             shape.width

src/comment.rs

@@ -591,7 +591,7 @@ impl<'a> CommentRewrite<'a> {
             ) {
                 Some(s) => self.result.push_str(&Self::join_block(
                     &s,
-                    &format!("{}{}", &self.comment_line_separator, ib.line_start),
+                    &format!("{}{}", self.comment_line_separator, ib.line_start),
                 )),
                 None => self.result.push_str(&Self::join_block(
                     &ib.original_block_as_string(),
@@ -634,7 +634,7 @@ impl<'a> CommentRewrite<'a> {
             ) {
                 Some(s) => self.result.push_str(&Self::join_block(
                     &s,
-                    &format!("{}{}", &self.comment_line_separator, ib.line_start),
+                    &format!("{}{}", self.comment_line_separator, ib.line_start),
                 )),
                 None => self.result.push_str(&Self::join_block(
                     &ib.original_block_as_string(),

src/config/config_type.rs

@@ -236,10 +236,7 @@ macro_rules! create_config {
                 use std::cmp;
                 let max = 0;
                 $( let max = cmp::max(max, stringify!($i).len()+1); )+
-                let mut space_str = String::with_capacity(max);
-                for _ in 0..max {
-                    space_str.push(' ');
-                }
+                let space_str = " ".repeat(max);
                 writeln!(out, "Configuration Options:").unwrap();
                 $(
                     if $stb || include_unstable {

src/config/file_lines.rs

@@ -156,20 +156,18 @@ fn normalize_ranges(ranges: &mut HashMap<FileName, Vec<Range>>) {
     for ranges in ranges.values_mut() {
         ranges.sort();
         let mut result = vec![];
-        {
-            let mut iter = ranges.iter_mut().peekable();
-            while let Some(next) = iter.next() {
-                let mut next = *next;
-                while let Some(&&mut peek) = iter.peek() {
-                    if let Some(merged) = next.merge(peek) {
-                        iter.next().unwrap();
-                        next = merged;
-                    } else {
-                        break;
-                    }
+        let mut iter = ranges.iter_mut().peekable();
+        while let Some(next) = iter.next() {
+            let mut next = *next;
+            while let Some(&&mut peek) = iter.peek() {
+                if let Some(merged) = next.merge(peek) {
+                    iter.next().unwrap();
+                    next = merged;
+                } else {
+                    break;
                 }
-                result.push(next)
             }
+            result.push(next)
         }
         *ranges = result;
     }

src/config/mod.rs

@@ -257,16 +257,14 @@ impl Config {
         let parsed: ::toml::Value = toml
             .parse()
             .map_err(|e| format!("Could not parse TOML: {}", e))?;
-        let mut err: String = String::new();
-        {
-            let table = parsed
-                .as_table()
-                .ok_or(String::from("Parsed config was not table"))?;
-            for key in table.keys() {
-                if !Config::is_valid_name(key) {
-                    let msg = &format!("Warning: Unknown configuration option `{}`\n", key);
-                    err.push_str(msg)
-                }
+        let mut err = String::new();
+        let table = parsed
+            .as_table()
+            .ok_or(String::from("Parsed config was not table"))?;
+        for key in table.keys() {
+            if !Config::is_valid_name(key) {
+                let msg = &format!("Warning: Unknown configuration option `{}`\n", key);
+                err.push_str(msg)
             }
         }
         match parsed.try_into() {

src/expr.rs

@@ -1,6 +1,7 @@
 use std::borrow::Cow;
 use std::cmp::min;
 
+use itertools::Itertools;
 use syntax::parse::token::DelimToken;
 use syntax::source_map::{BytePos, SourceMap, Span};
 use syntax::{ast, ptr};
@@ -1246,8 +1247,7 @@ fn rewrite_string_lit(context: &RewriteContext<'_>, span: Span, shape: Shape) ->
     if !context.config.format_strings() {
         if string_lit
             .lines()
-            .rev()
-            .skip(1)
+            .dropping_back(1)
             .all(|line| line.ends_with('\\'))
         {
             let new_indent = shape.visual_indent(1).indent;
@@ -1459,7 +1459,7 @@ fn rewrite_paren(
     let subexpr_str = subexpr.rewrite(context, sub_shape)?;
     let fits_single_line = !pre_comment.contains("//") && !post_comment.contains("//");
     if fits_single_line {
-        Some(format!("({}{}{})", pre_comment, &subexpr_str, post_comment))
+        Some(format!("({}{}{})", pre_comment, subexpr_str, post_comment))
     } else {
         rewrite_paren_in_multi_line(context, subexpr, shape, pre_span, post_span)
     }

src/formatting.rs

@@ -48,11 +48,7 @@ impl<'b, T: Write + 'b> Session<'b, T> {
             let format_result = format_project(input, config, self);
 
             format_result.map(|report| {
-                {
-                    let new_errors = &report.internal.borrow().1;
-
-                    self.errors.add(new_errors);
-                }
+                self.errors.add(&report.internal.borrow().1);
                 report
             })
         })

src/imports.rs

@@ -205,11 +205,10 @@ impl fmt::Display for UseSegment {
             UseSegment::List(ref list) => {
                 write!(f, "{{")?;
                 for (i, item) in list.iter().enumerate() {
-                    let is_last = i == list.len() - 1;
-                    write!(f, "{}", item)?;
-                    if !is_last {
+                    if i != 0 {
                         write!(f, ", ")?;
                     }
+                    write!(f, "{}", item)?;
                 }
                 write!(f, "}}")
             }
@@ -219,13 +218,12 @@ impl fmt::Display for UseSegment {
 impl fmt::Display for UseTree {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         for (i, segment) in self.path.iter().enumerate() {
-            let is_last = i == self.path.len() - 1;
-            write!(f, "{}", segment)?;
-            if !is_last {
+            if i != 0 {
                 write!(f, "::")?;
             }
+            write!(f, "{}", segment)?;
         }
-        write!(f, "")
+        Ok(())
     }
 }
 

src/items.rs

@@ -730,7 +730,7 @@ pub fn format_impl(
                 if generics.where_clause.predicates.len() == 1 {
                     result.push_str(",");
                 }
-                result.push_str(&format!("{}{{{}}}", &sep, &sep));
+                result.push_str(&format!("{}{{{}}}", sep, sep));
             } else {
                 result.push_str(" {}");
             }
@@ -912,7 +912,7 @@ fn rewrite_trait_ref(
     let shape = Shape::indented(offset + used_space, context.config);
     if let Some(trait_ref_str) = trait_ref.rewrite(context, shape) {
         if !trait_ref_str.contains('\n') {
-            return Some(format!(" {}{}", polarity_str, &trait_ref_str));
+            return Some(format!(" {}{}", polarity_str, trait_ref_str));
         }
     }
     // We could not make enough space for trait_ref, so put it on new line.
@@ -921,9 +921,9 @@ fn rewrite_trait_ref(
     let trait_ref_str = trait_ref.rewrite(context, shape)?;
     Some(format!(
         "{}{}{}",
-        &offset.to_string_with_newline(context.config),
+        offset.to_string_with_newline(context.config),
         polarity_str,
-        &trait_ref_str
+        trait_ref_str
     ))
 }
 

src/lists.rs

@@ -577,13 +577,8 @@ pub fn extract_pre_comment(pre_snippet: &str) -> (Option<String>, ListItemCommen
     let has_block_comment = trimmed_pre_snippet.ends_with("*/");
     let has_single_line_comment = trimmed_pre_snippet.starts_with("//");
     if has_block_comment {
-        let comment_end = pre_snippet.chars().rev().position(|c| c == '/').unwrap();
-        if pre_snippet
-            .chars()
-            .rev()
-            .take(comment_end + 1)
-            .any(|c| c == '\n')
-        {
+        let comment_end = pre_snippet.rfind(|c| c == '/').unwrap();
+        if pre_snippet[comment_end..].contains('\n') {
             (
                 Some(trimmed_pre_snippet.to_owned()),
                 ListItemCommentStyle::DifferentLine,

src/macros.rs

@@ -540,17 +540,12 @@ fn register_metavariable(
     name: &str,
     dollar_count: usize,
 ) {
-    let mut new_name = String::new();
-    let mut old_name = String::new();
+    let mut new_name = "$".repeat(dollar_count - 1);
+    let mut old_name = "$".repeat(dollar_count);
 
-    old_name.push('$');
-    for _ in 0..(dollar_count - 1) {
-        new_name.push('$');
-        old_name.push('$');
-    }
     new_name.push('z');
-    new_name.push_str(&name);
-    old_name.push_str(&name);
+    new_name.push_str(name);
+    old_name.push_str(name);
 
     result.push_str(&new_name);
     map.insert(old_name, new_name);

src/overflow.rs

@@ -2,6 +2,7 @@
 
 use std::cmp::min;
 
+use itertools::Itertools;
 use syntax::parse::token::DelimToken;
 use syntax::source_map::Span;
 use syntax::{ast, ptr};
@@ -711,10 +712,14 @@ fn last_item_shape(
     if items.len() == 1 && !lists.get(0)?.is_nested_call() {
         return Some(shape);
     }
-    let offset = items.iter().rev().skip(1).fold(0, |acc, i| {
-        // 2 = ", "
-        acc + 2 + i.inner_as_ref().len()
-    });
+    let offset = items
+        .iter()
+        .dropping_back(1)
+        .map(|i| {
+            // 2 = ", "
+            2 + i.inner_as_ref().len()
+        })
+        .sum();
     Shape {
         width: min(args_max_width, shape.width),
         ..shape

src/test/mod.rs

@@ -609,11 +609,11 @@ fn handle_result(
     for (file_name, fmt_text) in result {
         // If file is in tests/source, compare to file with same name in tests/target.
         let target = get_target(&file_name, target);
-        let open_error = format!("couldn't open target {:?}", &target);
+        let open_error = format!("couldn't open target {:?}", target);
         let mut f = fs::File::open(&target).expect(&open_error);
 
         let mut text = String::new();
-        let read_error = format!("failed reading target {:?}", &target);
+        let read_error = format!("failed reading target {:?}", target);
         f.read_to_string(&mut text).expect(&read_error);
 
         // Ignore LF and CRLF difference for Windows.

src/vertical.rs

@@ -2,6 +2,7 @@
 
 use std::cmp;
 
+use itertools::Itertools;
 use syntax::ast;
 use syntax::source_map::{BytePos, Span};
 
@@ -190,11 +191,8 @@ fn struct_field_prefix_max_min_width<T: AlignedItem>(
                 }
             })
         })
-        .fold(Some((0, ::std::usize::MAX)), |acc, len| match (acc, len) {
-            (Some((max_len, min_len)), Some(len)) => {
-                Some((cmp::max(max_len, len), cmp::min(min_len, len)))
-            }
-            _ => None,
+        .fold_options((0, ::std::usize::MAX), |(max_len, min_len), len| {
+            (cmp::max(max_len, len), cmp::min(min_len, len))
         })
         .unwrap_or((0, 0))
 }
@@ -274,7 +272,11 @@ fn group_aligned_items<T: AlignedItem>(
             .skip(1)
             .collect::<Vec<_>>()
             .join("\n");
-        let spacings = if snippet.lines().rev().skip(1).any(|l| l.trim().is_empty()) {
+        let spacings = if snippet
+            .lines()
+            .dropping_back(1)
+            .any(|l| l.trim().is_empty())
+        {
             "\n"
         } else {
             ""