From 56f671f6151cae53abfc34cf3c1629784f1f7289 Mon Sep 17 00:00:00 2001
From: Joakim Hulthe <joakim@hulthe.net>
Date: Fri, 11 Nov 2022 20:28:21 +0100
Subject: [PATCH] Initial commit

---
 .gitignore  |  1 +
 Cargo.lock  | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  7 +++++
 src/main.rs | 49 ++++++++++++++++++++++++++++++++++
 4 files changed, 132 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..aad7987
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,75 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "colored"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b3616f750b84d8f0de8a58bda93e08e2a81ad3f523089b05f1dffecab48c6cbd"
+dependencies = [
+ "atty",
+ "lazy_static",
+ "winapi",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.136"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55edcf6c0bb319052dea84732cf99db461780fd5e8d3eb46ab6ff312ab31f197"
+
+[[package]]
+name = "linediff"
+version = "0.1.0"
+dependencies = [
+ "colored",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8123c8e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "linediff"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+colored = "2.0.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..71bc3f7
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,49 @@
+use colored::Colorize;
+use std::{
+    io::{stdin, BufRead},
+    mem::swap,
+};
+
+fn main() {
+    let mut stdin = stdin().lock();
+
+    let mut prev_line = String::new();
+    let mut next_line = String::new();
+    while let Ok(n) = stdin.read_line(&mut next_line) {
+        if n == 0 {
+            break;
+        }
+
+        if next_line.ends_with('\n') {
+            next_line.pop();
+        }
+
+        let mut chars1 = prev_line.chars();
+        let mut chars2 = next_line.chars();
+
+        let mut buf = [0u8; 4];
+        while let Some(c1) = chars1.next() {
+            if let Some(c2) = chars2.next() {
+                let s = c2.encode_utf8(&mut buf);
+                if c1 == c2 {
+                    print!("{}", s);
+                } else {
+                    print!("{}", s.yellow());
+                }
+            } else {
+                let s = c1.encode_utf8(&mut buf);
+                print!("{}", s.red().strikethrough());
+            }
+        }
+
+        while let Some(c2) = chars2.next() {
+            let s = c2.encode_utf8(&mut buf);
+            print!("{}", s.green());
+        }
+
+        println!();
+
+        prev_line.clear();
+        swap(&mut next_line, &mut prev_line);
+    }
+}