add pretty line print with colors

Cargo.lock

@@ -22,4 +22,96 @@ name = "ndiff"
 version = "0.1.0"
 dependencies = [
  "itertools",
+ "termcolor",
 ]
+
+[[package]]
+name = "termcolor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "winapi-util"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"

Cargo.toml

@@ -4,4 +4,5 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-itertools = "0.13.0"
+itertools = {version = "0.13.0"}
+termcolor = {version =  "1.4.1" }

src/line.rs

@@ -1,5 +1,6 @@
-use std::fmt;
+use std::{fmt};
-use std::fmt::Formatter;
+use std::fmt::{Debug, Formatter};
+use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
 
 #[derive(Debug)]
 pub(crate) struct MissingLineIndicator {
@@ -26,6 +27,29 @@ pub(crate) enum Line {
     DifferingLine(i32, String, String),
 }
 
+impl Line {
+
+    /// Prints the line to stdout
+    pub fn print(&self) {
+        match self {
+            Line::MatchedLine(line_number, line) => {
+                println!(r#"{}. {}"#, line_number, line)
+            }
+            Line::DifferingLine(line_number, left_line, right_line) => {
+                let mut stdout = StandardStream::stdout(ColorChoice::Always);
+                let _ = stdout.set_color(ColorSpec::new().set_fg(Some(Color::Green)));
+                println!(" - {}", left_line);
+                let _ = stdout.reset();
+                println!("{line_number}. ----");
+                let _ = stdout.set_color(ColorSpec::new().set_fg(Some(Color::Red)));
+                println!(" + {}", right_line);
+                let _ = stdout.reset();
+                let _ = stdout.reset();
+            }
+        }
+    }
+}
+
 impl fmt::Display for Line {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
         match self {

src/main.rs

@@ -35,7 +35,7 @@ fn main() {
 
     let mut differences_counter: i32 = 0;
     for line in lines.iter() {
-        print!("{}", line);
+        line.print();
         match line {
             Line::MatchedLine(_, _) => {}
             Line::DifferingLine(_, _, _) => {