fix: clippy warnings

src/lib.rs

@@ -1,11 +1,14 @@
+use clap::Parser;
 use std::{
     fs::{read_to_string, write},
     io::{self},
     path::PathBuf,
 };
 
-use clap::Parser;
-
+/// A CLI tool for reversing text content
+///
+/// This tool provides functionality to reverse text, either from direct input
+/// or from files. It supports both whole-content reversal and line-by-line reversal.
 #[derive(Debug, Parser)]
 #[command(author, version, about, long_about = None)]
 pub struct Cli {
@@ -22,27 +25,43 @@ pub struct Cli {
     pub line_by_line: bool,
 }
 
+/// Reverses the provided string
+#[inline]
+#[must_use]
 pub fn encode(s: &str) -> String {
     s.chars().rev().collect()
 }
-
+/// Reverses a string directly
+///
+/// This is a convenience wrapper around the `encode` function.
+#[inline]
+#[must_use]
 pub fn encode_string(s: &str) -> String {
     encode(s)
 }
 
+/// Reverses the contents of a file
+///
+/// # Errors
+/// - The file cannot be read
+/// - The file content is not valid UTF-8
 pub fn encode_file(path: impl Into<PathBuf>, line_by_line: bool) -> io::Result<String> {
     let path = path.into();
     let content = read_to_string(path)?;
     if line_by_line {
         return Ok(content
             .lines()
-            .map(|line| encode(line))
+            .map(encode)
             .collect::<Vec<String>>()
             .join("\n"));
     }
     Ok(encode(&content))
 }
 
+/// Processes the input based on CLI arguments
+///
+/// # Errors
+/// - There was an error reading or writing files
 pub fn process_input(cli: &Cli) -> io::Result<Option<String>> {
     let result = if cli.file {
         encode_file(&cli.input, cli.line_by_line)?

src/main.rs

@@ -14,7 +14,7 @@ fn main() -> io::Result<()> {
             Ok(())
         }
         Err(e) => {
-            eprintln!("Error: {}", e);
+            eprintln!("Error: {e}");
             Err(e)
         }
     }