initial commit

.gitignore

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+/target

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/ndiff.iml" filepath="$PROJECT_DIR$/.idea/ndiff.iml" />
+    </modules>
+  </component>
+</project>

.idea/ndiff.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="EMPTY_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "either"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+
+[[package]]
+name = "itertools"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "ndiff"
+version = "0.1.0"
+dependencies = [
+ "itertools",
+]

Cargo.toml

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+[package]
+name = "ndiff"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+itertools = "0.13.0"

a.txt

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+ala
+bala
+porto
+cala

b.txt

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+ala
+alab
+porto
+cala
+$$

readme.md

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+# Ndiff
+
+Ndiff is an educational Rust rewrite of the [diff](https://linux.die.net/man/1/diff) program.
+
+Of course, it's no way near as featured as 
+the [diff](https://linux.die.net/man/1/diff) command, 
+since it's utility is to learn Rust concepts by completing a simple project.

src/difference.rs

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+use std::fmt;
+use std::fmt::Formatter;
+use std::ops::Deref;
+
+/// A line difference is represented by the Difference struct.
+#[derive(Debug)]
+pub(crate) struct Difference {
+    line_number: i32,
+    missing_line_indicator: String,
+    left_line: String,
+    right_line: String,
+}
+
+impl Difference {
+    pub fn new(line_number: i32, left_line: String, right_line: String) -> Difference {
+        Difference {
+            line_number,
+            missing_line_indicator: String::from("<missing line>"),
+            left_line: left_line.into(),
+            right_line: right_line.into(),
+        }
+    }
+
+    /// Returns the left line of the difference.
+    #[allow(dead_code)]
+    pub fn left_line(&self) -> &String {
+        if self.left_line.deref() == "" {
+            return &self.missing_line_indicator;
+        }
+        &self.left_line
+    }
+
+    /// Returns the right line of the difference.
+    #[allow(dead_code)]
+    pub fn right_line(&self) -> &String {
+        if self.right_line.deref() == "" {
+            return &self.missing_line_indicator;
+        }
+        &self.right_line
+    }
+}
+
+/// Implements the display trait.
+impl fmt::Display for Difference {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            r#"Line: {}.
+< {}
+----
+> {}
+
+"#,
+            self.line_number,
+            self.left_line(),
+            self.right_line()
+        )
+    }
+}

src/main.rs

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+use crate::difference::Difference;
+use itertools::Itertools;
+use std::fs::read_to_string;
+
+mod difference;
+
+/// Gets the differences of lines that differ in the given text.
+///
+/// It returns a [`Vec<Difference>`]
+fn get_differences(left_text: &String, right_text: &String) -> Vec<Difference> {
+    left_text
+        .lines()
+        .map(String::from)
+        .zip_longest(right_text.lines().map(String::from))
+        .enumerate()
+        .filter_map(|(line, item)| -> Option<Difference> {
+            let left = item.clone().left().unwrap_or(String::from(""));
+            let right = item.right().unwrap_or(String::from(""));
+
+            if left != right {
+                Some(Difference::new(line as i32 + 1, left, right))
+            } else {
+                return None;
+            }
+        })
+        .collect()
+}
+
+fn main() {
+    let left_file =
+        read_to_string("/Users/dnutiu/RustroverProjects/ndiff/a.txt").expect("Left file not found");
+    let right_file =
+        read_to_string("/Users/dnutiu/RustroverProjects/ndiff/b.txt").expect("Right file found");
+
+    let res: Vec<Difference> = get_differences(&left_file, &right_file);
+
+    for diff in res.iter() {
+        print!("{diff}")
+    }
+    println!("Found {} differences.", res.len())
+}