Add the CLI

Cargo.toml

@@ -8,3 +8,5 @@ license = "MIT OR Apache-2.0"
 publish = false
 
 [dependencies]
+anyhow = { version = "1.0.71", default-features = false, features = ["std"] }
+clap = { version = "4.3.11", default-features = false, features = ["derive", "std"] }

src/config.rs

@@ -0,0 +1,38 @@
+use anyhow::Result;
+use clap::Parser;
+use std::collections::HashSet;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::path::PathBuf;
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+pub struct Config {
+	#[arg(short, long)]
+	address: Vec<String>,
+	#[arg(short = 'A', long)]
+	address_file: Option<PathBuf>,
+	#[arg(short, long, default_value_t = crate::DEFAULT_SEPARATOR)]
+	separator: char,
+}
+
+impl Config {
+	pub fn addresses(&self) -> Result<HashSet<String>> {
+		let mut addr_set = HashSet::new();
+		for addr in &self.address {
+			addr_set.insert(addr.to_string());
+		}
+		if let Some(path) = &self.address_file {
+			let f = File::open(path)?;
+			let f = BufReader::new(f);
+			for line in f.lines() {
+				let line = line?;
+				let addr = line.trim();
+				if !addr.is_empty() && !addr.starts_with(crate::COMMENT_CHAR) {
+					addr_set.insert(addr.to_string());
+				}
+			}
+		}
+		Ok(addr_set)
+	}
+}

src/main.rs

@@ -1 +1,12 @@
-fn main() {}
+use clap::Parser;
+
+mod config;
+
+const COMMENT_CHAR: char = '#';
+const DEFAULT_SEPARATOR: char = '+';
+
+fn main() {
+	let cfg = config::Config::parse();
+	println!("{cfg:?}");
+	println!("{:?}", cfg.addresses());
+}