Rewrite everything in rust

hencelisp/src/bin/main.rs

@@ -0,0 +1,29 @@
+use clap::{Parser, Subcommand};
+use hencelisp::*;
+use std::fs;
+
+#[derive(Debug, Parser)]
+#[clap(author, version, about, long_about = None)]
+struct Cli {
+    #[clap(subcommand)]
+    commands: Commands,
+}
+
+#[derive(Debug, Subcommand)]
+enum Commands {
+    #[clap(about = "Lexes source code and outputs tokens")]
+    Lex {
+        #[clap(value_parser)]
+        src: String,
+    },
+}
+
+fn main() {
+    let args = Cli::parse();
+    match args.commands {
+        Commands::Lex { src } => {
+            let source = fs::read_to_string(src).unwrap();
+            println!("{source}");
+        }
+    }
+}