style(rust): Format all Rust code with rustfmt

Change-Id: Iab7e00cc26a4f9727d3ab98691ef379921a33052
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5240
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <tazjin@tvl.su>

tools/cheddar/build.rs

@@ -28,14 +28,19 @@ fn main() {
 
     // Otherwise ask Nix to build it and inject the result.
     let output = Command::new("nix-build")
-        .arg("-A").arg("third_party.bat_syntaxes")
+        .arg("-A")
+        .arg("third_party.bat_syntaxes")
         // ... assuming cheddar is at //tools/cheddar ...
         .arg("../..")
         .output()
         .expect(ERROR_MESSAGE);
 
     if !output.status.success() {
-        eprintln!("{}\nNix output: {}", ERROR_MESSAGE, String::from_utf8_lossy(&output.stderr));
+        eprintln!(
+            "{}\nNix output: {}",
+            ERROR_MESSAGE,
+            String::from_utf8_lossy(&output.stderr)
+        );
         return;
     }
 

tools/cheddar/src/bin/cheddar.rs

@@ -5,14 +5,13 @@
 //! 2. As a long-running HTTP server that handles rendering requests
 //!    (matching the SourceGraph protocol).
 use clap::{App, Arg};
-use rouille::Response;
-use rouille::{router, try_or_400};
+use rouille::{router, try_or_400, Response};
 use serde::Deserialize;
 use serde_json::json;
 use std::collections::HashMap;
 use std::io;
 
-use cheddar::{THEMES, format_code, format_markdown};
+use cheddar::{format_code, format_markdown, THEMES};
 
 // Server endpoint for rendering the syntax of source code. This
 // replaces the 'syntect_server' component of Sourcegraph.

tools/cheddar/src/lib.rs

@@ -8,12 +8,10 @@ use lazy_static::lazy_static;
 use regex::Regex;
 use std::cell::RefCell;
 use std::collections::HashMap;
-use std::env;
 use std::ffi::OsStr;
-use std::io;
-use std::io::BufRead;
-use std::io::Write;
+use std::io::{BufRead, Write};
 use std::path::Path;
+use std::{env, io};
 use syntect::dumps::from_binary;
 use syntect::easy::HighlightLines;
 use syntect::highlighting::{Theme, ThemeSet};