feat: implement an iterator to get the test with a test consumer

src/main.rs

@@ -1,4 +1,5 @@
 use clap::Parser;
+mod parser;
 
 #[derive(Parser)]
 struct Cli {
@@ -6,9 +7,14 @@ struct Cli {
     file_path: String,
 }
 
-fn main() {
+fn main() -> anyhow::Result<()> {
     let cli = Cli::parse();
 
+    let lines_iter = parser::read_lines(&cli.file_path)?;
+    parser::consume_lines(lines_iter);
+
     println!("Pattern: {}", cli.pattern);
     println!("File path: {}", cli.file_path);
+
+    Ok(())
 }

src/parser.rs

@@ -0,0 +1,27 @@
+use std::{
+    fs::File,
+    io::{BufRead, BufReader},
+};
+
+use anyhow::Context;
+
+pub fn read_lines(
+    file_path: &str,
+) -> anyhow::Result<impl Iterator<Item = std::io::Result<String>>, anyhow::Error> {
+    if file_path.is_empty() {
+        return Err(anyhow::anyhow!("File path cannot be empty"));
+    }
+
+    let file =
+        File::open(file_path).with_context(|| format!("failed to open file: {file_path}"))?;
+    let reader = BufReader::new(file);
+
+    Ok(reader.lines())
+}
+
+pub fn consume_lines(iter: impl Iterator<Item = std::io::Result<String>>) {
+    for line in iter {
+        let line = line.unwrap_or("".into());
+        println!("{line}");
+    }
+}

test.txt

@@ -0,0 +1,2 @@
+hola
+no