commit e7be703e3f92a598823be7dfad753d4ec24fc218
Author: Atreya Bain <atreyabain@gmail.com>
Date:   Fri Oct 25 12:28:32 2024 +0100

    [add] initial code

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4d0f397
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
+input.txt
+output.txt
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..0096d3f
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,434 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e1e7c15
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "hosts2blocker"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4.5.20", features = ["derive"] }
+log = "0.4.22"
+simple_logger = "5.0.0"
+
+[profile.release]
+strip = true
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..6216b19
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,79 @@
+use std::io::BufRead;
+
+use clap::{command, Parser};
+use log::{debug, info, trace};
+use simple_logger::SimpleLogger;
+
+#[derive(Debug, Parser)]
+#[command(version, about)]
+struct ProgramArgs {
+    #[arg(short, long, default_value = "input.txt")]
+    input_file: String,
+    #[arg(short, long, default_value = "output.txt")]
+    output_file: String,
+}
+
+fn main() -> Result<(), std::io::Error> {
+    SimpleLogger::new()
+        .with_level(log::LevelFilter::Info)
+        .init()
+        .expect("Failed to init logging");
+
+    let ProgramArgs {
+        input_file,
+        output_file,
+    } = ProgramArgs::parse();
+
+    let mut reader = open_buf_reader(&input_file)?;
+
+    let mut hosts = Vec::with_capacity(10000);
+
+    let mut read_chars_len: usize;
+
+    loop {
+        let mut hostsfile_line: String = String::new();
+        read_chars_len = reader.read_line(&mut hostsfile_line)?;
+        if read_chars_len == 0 {
+            info!("Completed reading file {:?}", input_file);
+            break;
+        } else if read_chars_len == 1 && hostsfile_line.contains("\n") {
+            debug!("Empty str")
+        } else if hostsfile_line.starts_with("#") {
+            debug!("Comment line, ignore");
+        } else {
+            // println!("Line read - {:?}",stored_line);
+            get_host_from_line(&hostsfile_line).map(|host| {
+                hosts.push(host);
+            });
+        }
+        hostsfile_line.clear();
+    }
+
+    info!("Processed {} hosts", hosts.len());
+    debug!("Last item - {:?}", hosts.last());
+    write_hosts_to_file(hosts, output_file)?;
+    Ok(())
+}
+
+fn open_buf_reader(
+    input_file: &String,
+) -> Result<std::io::BufReader<std::fs::File>, std::io::Error> {
+    let file = std::fs::OpenOptions::new().read(true).open(input_file)?;
+    let reader = std::io::BufReader::new(file);
+    Ok(reader)
+}
+
+fn write_hosts_to_file(hosts: Vec<String>, file_name: String) -> Result<(), std::io::Error> {
+    std::fs::write(file_name, hosts.join("\n"))
+}
+
+fn get_host_from_line(stored_line: &String) -> Option<String> {
+    let arrays = stored_line.split(" ");
+    let elements: Vec<&str> = arrays.collect();
+    if elements.len() != 2 {
+        return None;
+    }
+    let host_string: String = elements[1].trim_end().into();
+    trace!("Read host {:?}", host_string);
+    Some(host_string)
+}