parse command-line arguments

shell-1/Cargo.toml

@@ -7,3 +7,4 @@ edition = "2021"
 
 [dependencies]
 chrono = "0.4"
+clap = { version = "3.2", features = ["derive"] }

shell-1/src/main.rs

@@ -1,7 +1,9 @@
 use std::io;
 use std::io::Write;
+use std::env::args;
 use std::time::SystemTime;
 use chrono::{DateTime, Utc};
+use clap::Parser;
 
 mod lexer;
 mod parser;
@@ -14,10 +16,23 @@ use lexer::lex;
 use parser::parse;
 use node::Node;
 
+#[derive(Parser, Debug)]
+#[clap(version, about)]
+struct Args {
+    #[clap(short, long, value_parser, default_value="")]
+    path: String,
+
+    // #[clap(short, long, default_value_t=false)]
+    #[clap(short, long, action)]
+    debug: bool
+}
+
 fn main() {
     let mut input = String::new();
     // let now = SystemTime::now();
     let now = Utc::now();
+    let args = Args::parse();
+    println!("{:#?}", args);
     println!("shell-1 | {}", now);
     loop {
         print!("~ ");
@@ -26,10 +41,14 @@ fn main() {
         io::stdin().read_line(&mut input).unwrap();
 
         let tokens = lex(input.clone(), false).unwrap();
-        println!("{:?}", tokens);
+        if args.debug {
+            println!("{:#?}", tokens);
+        }
 
         let tree: Node = parse(tokens, false);
-        println!("{:?}", tree);
+        if args.debug {
+            println!("{:#?}", tree);
+        }
 
         println!("{}", tree.evaluate().unwrap());
     }

shell-1/src/parser.rs

@@ -43,7 +43,7 @@ pub fn parse(tokens: Vec<Token>, verbose: bool) -> Node {
                     "}" => {
                         stack.pop();
                     },
-                    _ => todo!()
+                    _ => todo!("{:?}", token.content)
                 }
             }
             CharType::Newline | CharType::Whitespace | CharType::None => (),