how do you even write a parser lol

src/main.rs

@@ -60,6 +60,9 @@ fn main() -> Result<()> {
                 if event.code == key::ENTER {
                     shell.output.newline()?;
                     let s = shell.line.pop();
+                    info!("◇ {}", s);
+                    let tree = parse::parse(&s)?;
+                    debug!("  {:?}", tree);
                     let parts: Vec<&str> = s.split_whitespace().collect();
 
                     if parts.len() > 0 {
@@ -69,10 +72,9 @@ fn main() -> Result<()> {
                         } else {
                             vec![]
                         };
-                        debug!("◇ {} {}", cmd.clone(), args.join(" "));
                         match shell.eval(cmd.clone(), args.clone()) {
-                            Ok(true) => info!("▷ {} {}", cmd, args.join(" ")),
+                            Ok(true) => debug!("  ok"),
-                            Ok(false) => warn!("▷ {} {}", cmd, args.join(" ")),
+                            Ok(false) => warn!("  fail"),
                             Err(e) => {
                                 error!("▷ {} {} ● {}", cmd, args.join(" "), e);
                                 println!("error: {}", e);

src/parse.rs

@@ -1,5 +1,11 @@
-#[derive(Debug)]
+use thiserror::Error;
-pub enum Error {}
+use log::debug;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Unexpected Token")]
+    UnexpectedToken,
+}
 
 #[allow(dead_code)]
 #[derive(Debug, PartialEq)]
@@ -98,16 +104,79 @@ impl<'text> Lexer<'text> {
     }
 }
 
+struct Command {
+    // name: String,
+    args: Vec<String>,
+}
+
+impl Node for Command {
+    fn with(mut self, t: Token) -> Result<Box<dyn Node>, Error> {
+        match t {
+            Token::Ident(s) => {
+                self.args.push(s);
+                Ok(Box::new(self))
+            },
+            _ => Err(Error::UnexpectedToken),
+        }
+    }
+}
+
 struct Parser {
 
 }
 
-struct Tree {
+impl Parser {
+    fn new() -> Self {
+        Self { }
+    }
 
+    fn parse(&self, _tokens: Vec<Token>) -> Result<Tree, Error> {
+        // if tokens.is_empty() {
+        // }
+        Ok(Tree{})
+    }
 }
 
-fn parse<S: AsRef<str>>(text: S) -> Result<Tree, Error> {
+#[derive(Debug)]
-    Ok(Tree{})
+pub struct Tree {
+
+}
+
+trait Node {
+    fn with(self, t: Token) -> Result<Box<dyn Node>, Error>;
+}
+
+// I don't know how to write a parser lol
+
+// ls
+//   Command{name: "ls"}
+
+// echo one two three
+//   Command{name: "echo", args: [Lit("one"), Lit("two"), Lit("three")]}
+
+// echo *.rs
+//   Command{name: "echo", args: [Glob("*.rs")]}
+//   Command{name: "echo", args: [Path("main.rs"), Path("parse.rs"), ...]}
+
+// cat main.rs | wc -l
+//   Pipe{
+//     src:  Command{name: "cat", args: [Lit("main.rs")]}
+//     dest: Command{name: "wc",  args: [Lit("-l")]}
+//   }
+
+// echo one ; echo two
+//   Sequence{
+//     children: [
+//       Command{Name: 
+//     ]
+//   }
+
+
+pub fn parse<S: AsRef<str>>(text: S) -> Result<Tree, Error> {
+    let tokens = lex(text)?;
+    let parser = Parser::new();
+    debug!("  {:?}", tokens);
+    parser.parse(tokens)
 }
 
 #[cfg(test)]