Initial commit

.gitignore

@@ -0,0 +1,8 @@
+*
+!*/
+!*.rs
+!*.toml
+!*.lock
+!*.md
+!.gitignore
+/target

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "fnl"
+version = "0.1.0"

Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "fnl"
+version = "0.1.0"
+edition = "2024"
+description = "Add or remove final newlines"
+repository = "https://git.urbach.dev/cli/fnl"
+license-file = "readme.md"
+readme = "readme.md"
+categories = ["command-line-utilities"]

readme.md

@@ -0,0 +1,37 @@
+# fnl
+
+Add or remove final newlines.
+
+## Installation
+
+```shell
+cargo install fnl
+```
+
+## Usage
+
+Show status:
+
+```shell
+find . -type f -name "*.txt" | xargs fnl
+```
+
+Add final newlines:
+
+```shell
+find . -type f -name "*.txt" | xargs fnl --add
+```
+
+Remove final newlines:
+
+```shell
+find . -type f -name "*.txt" | xargs fnl --remove
+```
+
+## License
+
+Please see the [license documentation](https://urbach.dev/license).
+
+## Copyright
+
+© 2025 Eduard Urbach

src/main.rs

@@ -0,0 +1,55 @@
+use std::env;
+use std::fs;
+
+enum Mode {
+    Info,
+    Add,
+    Remove,
+}
+
+fn main() {
+	let mut mode = Mode::Info;
+
+	for arg in env::args().skip(1) {
+        match arg.as_str() {
+            "--add" => { mode = Mode::Add; }
+            "--remove" => { mode = Mode::Remove; }
+            _ => { process_file(&arg, &mode); }
+        }
+	}
+}
+
+fn process_file(path: &str, mode: &Mode) {
+	let mut content = fs::read_to_string(path).expect("could not read file");
+
+	if ends_with_newline(&content) {
+        match mode {
+            Mode::Remove => {
+                content.pop();
+                fs::write(path, content).expect("could not write file");
+                println!("\x1B[1m{}\x1B[0m: \x1B[31mno final newline [removed]\x1B[0m", path);
+            }
+            _ => {
+                println!("\x1B[1m{}\x1B[0m: \x1B[32mfinal newline\x1B[0m", path);
+            }
+        }
+	} else {
+        match mode {
+            Mode::Add => {
+                content.push('\n');
+                fs::write(path, content).expect("could not write file");
+                println!("\x1B[1m{}\x1B[0m: \x1B[32mfinal newline [added]\x1B[0m", path);
+            }
+            _ => {
+                println!("\x1B[1m{}\x1B[0m: \x1B[31mno final newline\x1B[0m", path);
+            }
+        }
+	}
+}
+
+fn ends_with_newline(s: &str) -> bool {
+	match s.chars().last() {
+		Some('\n') => true,
+		_ => false,
+	}
+}