[rustfmt][clippy] more lints, better formatting

rustfmt.toml

@@ -1 +1,3 @@
-imports_layout = "Vertical"
+group_imports = "StdExternalCrate"
+imports_granularity = "Crate"
+imports_layout = "HorizontalVertical"

src/main.rs

@@ -1,17 +1,16 @@
-use chrono::prelude::*;
+#![warn(clippy::pedantic)]
+#![warn(clippy::todo)]
+#![warn(clippy::unwrap_used)]
+#![allow(clippy::inline_always)]
+
 use std::{
     env::args,
     fs::File,
-    io::{
-        stdin,
-        stdout,
-        Error as IoError,
-        ErrorKind,
-        Read,
-        Write,
-    },
+    io::{stdin, stdout, Error as IoError, ErrorKind, Read, Write},
 };
 
+use chrono::prelude::*;
+
 const TIME_FORMAT: &str = "%H:%M:%S%.6f";
 
 type LogtimesResult = Result<(), IoError>;
@@ -81,9 +80,8 @@ fn run() -> LogtimesResult {
         if let Err(e) = inp.read_exact(&mut buf) {
             if e.kind() == ErrorKind::UnexpectedEof {
                 return Ok(());
-            } else {
-                return Err(e);
             }
+            return Err(e);
         }
 
         // push that char to the "current line" buffer