surely this is not computer science

src/main.rs

@@ -63,27 +63,10 @@ fn main() -> Result<()> {
                     info!("◇ {}", s);
                     let tree = parse::parse(&s)?;
                     debug!("  {:?}", tree);
-                    let parts: Vec<&str> = s.split_whitespace().collect();
-
-                    if parts.len() > 0 {
-                        let cmd = parts[0].to_string();
-                        let args = if parts.len() > 1 {
-                            parts[1..].to_vec()
-                        } else {
-                            vec![]
-                        };
-                        match shell.eval(cmd.clone(), args.clone()) {
-                            Ok(true) => debug!("  ok"),
-                            Ok(false) => warn!("  fail"),
-                            Err(e) => {
-                                error!("▷ {} {} ● {}", cmd, args.join(" "), e);
-                                println!("error: {}", e);
-                            }
-                        }
-                        // Some commands don't leave the terminal in a clean state, so we use reset
-                        // to ensure that our input and output modes are what we expect them to be.
-                        shell.reset()?;
-                    }
+                    shell.exec(tree)?;
+                    // Some commands don't leave the terminal in a clean state, so we use reset
+                    // to ensure that our input and output modes are what we expect them to be.
+                    shell.reset()?;
                     prompt.print(&mut shell.output)?;
                     continue;
                 }

src/parse.rs

@@ -1,6 +1,4 @@
-use crate::shell::Shell;
 use log::debug;
-use std::fmt;
 use thiserror::Error;
 
 #[derive(Debug, Error)]
@@ -244,11 +242,3 @@ mod tests {
         ident("one") Pipe ident("two");
     }
 }
-
-/*
-
-
-
-
-
-*/

src/shell.rs

@@ -2,6 +2,7 @@ use crate::{
     ext::{Command, Echo, Printenv, Tail, Which},
     input,
     line::Line,
+    parse::Node,
     log::*,
     output,
     // parse::parse,
@@ -96,6 +97,19 @@ impl Shell {
         }
     }
 
+    pub fn exec(&mut self, mut node: Node) -> Result<bool> {
+        loop {
+            match node {
+                Node::Empty => break,
+                Node::Command{name, args} => {
+                    self.eval(name, args.iter().map(|s| s.as_str()).collect())?;
+                    node = Node::Empty;
+                },
+            }
+        }
+        Ok(true)
+    }
+
     pub fn eval(&mut self, cmd: String, args: Vec<&str>) -> Result<bool> {
         match cmd.as_str() {
             "pwd" => {