wc: refactor WordCount into its own module

Move the `WordCount` struct and its implementations into the
`wordcount.rs`.

src/uu/wc/src/wc.rs

@@ -12,8 +12,10 @@ extern crate uucore;
 
 mod count_bytes;
 mod countable;
+mod wordcount;
 use count_bytes::count_bytes_fast;
 use countable::WordCountable;
+use wordcount::{TitledWordCount, WordCount};
 
 use clap::{App, Arg, ArgMatches};
 use thiserror::Error;
@@ -21,7 +23,6 @@ use thiserror::Error;
 use std::cmp::max;
 use std::fs::File;
 use std::io::{self, Write};
-use std::ops::{Add, AddAssign};
 use std::path::Path;
 use std::str::from_utf8;
 
@@ -82,51 +83,6 @@ impl Settings {
     }
 }
 
-#[derive(Debug, Default, Copy, Clone)]
-struct WordCount {
-    bytes: usize,
-    chars: usize,
-    lines: usize,
-    words: usize,
-    max_line_length: usize,
-}
-
-impl Add for WordCount {
-    type Output = Self;
-
-    fn add(self, other: Self) -> Self {
-        Self {
-            bytes: self.bytes + other.bytes,
-            chars: self.chars + other.chars,
-            lines: self.lines + other.lines,
-            words: self.words + other.words,
-            max_line_length: max(self.max_line_length, other.max_line_length),
-        }
-    }
-}
-
-impl AddAssign for WordCount {
-    fn add_assign(&mut self, other: Self) {
-        *self = *self + other
-    }
-}
-
-impl WordCount {
-    fn with_title(self, title: &str) -> TitledWordCount {
-        TitledWordCount { title, count: self }
-    }
-}
-
-/// This struct supplements the actual word count with a title that is displayed
-/// to the user at the end of the program.
-/// The reason we don't simply include title in the `WordCount` struct is that
-/// it would result in unneccesary copying of `String`.
-#[derive(Debug, Default, Clone)]
-struct TitledWordCount<'a> {
-    title: &'a str,
-    count: WordCount,
-}
-
 static ABOUT: &str = "Display newline, word, and byte counts for each FILE, and a total line if
 more than one FILE is specified.";
 static VERSION: &str = env!("CARGO_PKG_VERSION");

src/uu/wc/src/wordcount.rs

@@ -0,0 +1,47 @@
+use std::cmp::max;
+use std::ops::{Add, AddAssign};
+
+#[derive(Debug, Default, Copy, Clone)]
+pub struct WordCount {
+    pub bytes: usize,
+    pub chars: usize,
+    pub lines: usize,
+    pub words: usize,
+    pub max_line_length: usize,
+}
+
+impl Add for WordCount {
+    type Output = Self;
+
+    fn add(self, other: Self) -> Self {
+        Self {
+            bytes: self.bytes + other.bytes,
+            chars: self.chars + other.chars,
+            lines: self.lines + other.lines,
+            words: self.words + other.words,
+            max_line_length: max(self.max_line_length, other.max_line_length),
+        }
+    }
+}
+
+impl AddAssign for WordCount {
+    fn add_assign(&mut self, other: Self) {
+        *self = *self + other
+    }
+}
+
+impl WordCount {
+    pub fn with_title(self, title: &str) -> TitledWordCount {
+        TitledWordCount { title, count: self }
+    }
+}
+
+/// This struct supplements the actual word count with a title that is displayed
+/// to the user at the end of the program.
+/// The reason we don't simply include title in the `WordCount` struct is that
+/// it would result in unneccesary copying of `String`.
+#[derive(Debug, Default, Clone)]
+pub struct TitledWordCount<'a> {
+    pub title: &'a str,
+    pub count: WordCount,
+}