diff --git a/src/day07/file_tree.rs b/src/day07/file_tree.rs
index 990bea8..6d54f6e 100644
--- a/src/day07/file_tree.rs
+++ b/src/day07/file_tree.rs
@@ -22,7 +22,7 @@ pub enum FileTreeError {
 type WeakNodeRef = Weak<RefCell<Node>>;
 
 #[derive(Debug)]
-pub struct NodeRef(Rc<RefCell<Node>>);
+pub struct NodeRef(pub Rc<RefCell<Node>>);
 
 impl Deref for NodeRef {
     type Target = Rc<RefCell<Node>>;
@@ -44,7 +44,7 @@ impl From<NodeRef> for Rc<RefCell<Node>> {
     }
 }
 
-impl Display for NodeRef{
+impl Display for NodeRef {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{}", self.borrow())
     }
@@ -55,6 +55,28 @@ impl NodeRef {
         node.set_parent(self);
         self.borrow_mut().add_children(node)
     }
+    pub fn new_dir(name: String) -> NodeRef {
+        NodeRef(Rc::new(RefCell::new(Node::new_dir(name))))
+    }
+    pub fn add_file(&mut self, name: String, size: usize) -> Result<NodeRef, FileTreeError> {
+        self.add_node(Node::new_file(name, size))
+    }
+    pub fn add_dir(&mut self, name: String) -> Result<NodeRef, FileTreeError> {
+        self.add_node(Node::new_dir(name))
+    }
+    pub fn get_all_dirs(&self) -> Vec<NodeRef> {
+        let mut ret = Vec::new();
+        match &self.borrow().contents {
+            Contents::Size(_) => {}
+            Contents::Children(c) => {
+                ret.push(NodeRef(Rc::clone(self)));
+                for node in c {
+                    ret.append(&mut node.get_all_dirs())
+                }
+            }
+        };
+        ret
+    }
 }
 
 #[derive(Debug)]
@@ -161,7 +183,7 @@ impl Node {
     }
 }
 
-impl Display for Node{
+impl Display for Node {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "- {} {}", self.name, self.contents)
     }
@@ -197,43 +219,87 @@ mod tests {
 
     #[test]
     fn test_dir_construction() {
-        let mut root = NodeRef(Rc::new(RefCell::new(Node::new_dir("/".to_string()))));
+        let mut root = NodeRef::new_dir("/".to_string());
         let mut cursor = root.add_node(Node::new_dir("a".to_string())).unwrap();
-        cursor = cursor.add_node(Node::new_dir("e".to_string())).unwrap();
-        cursor
-            .add_node(Node::new_file("i".to_string(), 584))
-            .unwrap();
+        cursor = cursor.add_dir("e".to_string()).unwrap();
+        cursor.add_file("i".to_string(), 584).unwrap();
         cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap();
-        cursor
-            .add_node(Node::new_file("f".to_string(), 29116))
-            .unwrap();
-        cursor
-            .add_node(Node::new_file("g".to_string(), 2557))
-            .unwrap();
-        cursor
-            .add_node(Node::new_file("h.lst".to_string(), 62596))
-            .unwrap();
+        cursor.add_file("f".to_string(), 29116).unwrap();
+        cursor.add_file("g".to_string(), 2557).unwrap();
+        cursor.add_file("h.lst".to_string(), 62596).unwrap();
         cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap();
-        cursor
-            .add_node(Node::new_file("b.txt".to_string(), 14848514))
-            .unwrap();
-        cursor
-            .add_node(Node::new_file("c.dat".to_string(), 8504156))
-            .unwrap();
-        cursor = cursor.add_node(Node::new_dir("d".to_string())).unwrap();
-        cursor
-            .add_node(Node::new_file("j".to_string(), 4060174))
-            .unwrap();
-        cursor
-            .add_node(Node::new_file("d.log".to_string(), 8033020))
-            .unwrap();
-        cursor
-            .add_node(Node::new_file("d.ext".to_string(), 5626152))
-            .unwrap();
-        cursor
-            .add_node(Node::new_file("k".to_string(), 7214296))
-            .unwrap();
+        cursor.add_file("b.txt".to_string(), 14848514).unwrap();
+        cursor.add_file("c.dat".to_string(), 8504156).unwrap();
+        cursor = cursor.add_dir("d".to_string()).unwrap();
+        cursor.add_file("j".to_string(), 4060174).unwrap();
+        cursor.add_file("d.log".to_string(), 8033020).unwrap();
+        cursor.add_file("d.ext".to_string(), 5626152).unwrap();
+        cursor.add_file("k".to_string(), 7214296).unwrap();
         assert_eq!(Rc::clone(root.deref()).borrow().get_total_size(), 48381165);
         println!("{}", root);
     }
+
+    #[test]
+    fn test_size_calcs() {
+        let mut root = NodeRef::new_dir("/".to_string());
+        let mut dirs: Vec<NodeRef> = Vec::new();
+        let mut cursor = root.add_dir("a".to_string()).unwrap();
+        dirs.push(NodeRef(Rc::clone(&cursor)));
+        cursor = cursor.add_dir("e".to_string()).unwrap();
+        dirs.push(NodeRef(Rc::clone(&cursor)));
+        cursor.add_file("i".to_string(), 584).unwrap();
+        cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap();
+        cursor.add_file("f".to_string(), 29116).unwrap();
+        cursor.add_file("g".to_string(), 2557).unwrap();
+        cursor.add_file("h.lst".to_string(), 62596).unwrap();
+        cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap();
+        cursor.add_file("b.txt".to_string(), 14848514).unwrap();
+        cursor.add_file("c.dat".to_string(), 8504156).unwrap();
+        cursor = cursor.add_node(Node::new_dir("d".to_string())).unwrap();
+        dirs.push(NodeRef(Rc::clone(&cursor)));
+        cursor.add_file("j".to_string(), 4060174).unwrap();
+        cursor.add_file("d.log".to_string(), 8033020).unwrap();
+        cursor.add_file("d.ext".to_string(), 5626152).unwrap();
+        cursor.add_file("k".to_string(), 7214296).unwrap();
+        assert_eq!(Rc::clone(root.deref()).borrow().get_total_size(), 48381165);
+        assert_eq!(Rc::clone(dirs[0].deref()).borrow().get_total_size(), 94853);
+        assert_eq!(Rc::clone(dirs[1].deref()).borrow().get_total_size(), 584);
+        assert_eq!(
+            Rc::clone(dirs[2].deref()).borrow().get_total_size(),
+            24933642
+        );
+    }
+    #[test]
+    fn test_get_all_dirs() {
+        let mut root = NodeRef::new_dir("/".to_string());
+        let mut cursor = root.add_dir("a".to_string()).unwrap();
+        cursor = cursor.add_dir("e".to_string()).unwrap();
+        cursor.add_file("i".to_string(), 584).unwrap();
+        cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap();
+        cursor.add_file("f".to_string(), 29116).unwrap();
+        cursor.add_file("g".to_string(), 2557).unwrap();
+        cursor.add_file("h.lst".to_string(), 62596).unwrap();
+        cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap();
+        cursor.add_file("b.txt".to_string(), 14848514).unwrap();
+        cursor.add_file("c.dat".to_string(), 8504156).unwrap();
+        cursor = cursor.add_node(Node::new_dir("d".to_string())).unwrap();
+        cursor.add_file("j".to_string(), 4060174).unwrap();
+        cursor.add_file("d.log".to_string(), 8033020).unwrap();
+        cursor.add_file("d.ext".to_string(), 5626152).unwrap();
+        cursor.add_file("k".to_string(), 7214296).unwrap();
+        let dirs = root.get_all_dirs();
+        let sizes: Vec<usize> = dirs.iter().map(|d| d.borrow().get_total_size()).collect();
+        println!("{:?}", sizes);
+        assert_eq!(Rc::clone(root.deref()).borrow().get_total_size(), 48381165);
+        assert_eq!(
+            Rc::clone(dirs[0].deref()).borrow().get_total_size(),
+            48381165
+        );
+        assert_eq!(Rc::clone(dirs[1].deref()).borrow().get_total_size(), 94853);
+        assert_eq!(Rc::clone(dirs[2].deref()).borrow().get_total_size(), 584);
+        assert_eq!(
+            Rc::clone(dirs[3].deref()).borrow().get_total_size(),
+            24933642
+        );
+    }
 }
diff --git a/src/day07/parser.rs b/src/day07/parser.rs
index f9bf84c..3be66d7 100644
--- a/src/day07/parser.rs
+++ b/src/day07/parser.rs
@@ -1,4 +1,7 @@
 #![allow(unused)]
+use std::ops::Deref;
+use std::{cell::RefCell, rc::Rc};
+
 use crate::file_tree::*;
 use once_cell::sync::Lazy;
 use regex::Regex;
@@ -77,8 +80,29 @@ pub fn parse(input: &str) -> Node {
     unimplemented!()
 }
 
-pub fn commands_to_tree(input: Vec<Command>) -> Node {
-    unimplemented!()
+pub fn commands_to_tree(input: Vec<Command>) -> NodeRef {
+    let root = NodeRef::new_dir("/".to_string());
+    let mut cursor = NodeRef(Rc::clone(&root));
+    for command in input {
+        match command {
+            Command::CdRoot => cursor = NodeRef(Rc::clone(&root)),
+            Command::CdUp => cursor = Rc::clone(cursor.deref()).borrow().get_parent().unwrap(),
+            Command::Cd(name) => cursor = cursor.add_dir(name).unwrap(),
+            Command::Ls(ls) => {
+                for entry in ls {
+                    match entry {
+                        LsEntry::Dir(d) => {
+                            //dirs dont exist until you cd into them.
+                        }
+                        LsEntry::File(f) => {
+                            cursor.add_file(f.name, f.size);
+                        }
+                    };
+                }
+            }
+        }
+    }
+    root
 }
 
 #[cfg(test)]
@@ -173,4 +197,67 @@ mod tests {
             ]
         )
     }
+    #[test]
+    fn test_commands_to_tree() {
+        let input = vec![
+            Command::CdRoot,
+            Command::Ls(vec![
+                LsEntry::Dir(String::from("a")),
+                LsEntry::File(ParseFile {
+                    size: 14848514,
+                    name: String::from("b.txt"),
+                }),
+                LsEntry::File(ParseFile {
+                    size: 8504156,
+                    name: String::from("c.dat"),
+                }),
+                LsEntry::Dir(String::from("d")),
+            ]),
+            Command::Cd(String::from("a")),
+            Command::Ls(vec![
+                LsEntry::Dir(String::from("e")),
+                LsEntry::File(ParseFile {
+                    size: 29116,
+                    name: String::from("f"),
+                }),
+                LsEntry::File(ParseFile {
+                    size: 2557,
+                    name: String::from("g"),
+                }),
+                LsEntry::File(ParseFile {
+                    size: 62596,
+                    name: String::from("h.lst"),
+                }),
+            ]),
+            Command::Cd(String::from("e")),
+            Command::Ls(vec![LsEntry::File(ParseFile {
+                size: 584,
+                name: String::from("i"),
+            })]),
+            Command::CdUp,
+            Command::CdUp,
+            Command::Cd(String::from("d")),
+            Command::Ls(vec![
+                LsEntry::File(ParseFile {
+                    size: 4060174,
+                    name: String::from("j"),
+                }),
+                LsEntry::File(ParseFile {
+                    size: 8033020,
+                    name: String::from("d.log"),
+                }),
+                LsEntry::File(ParseFile {
+                    size: 5626152,
+                    name: String::from("d.ext"),
+                }),
+                LsEntry::File(ParseFile {
+                    size: 7214296,
+                    name: String::from("k"),
+                }),
+            ]),
+        ];
+        let tree = commands_to_tree(input);
+        println!("{}", tree);
+        assert_eq!(Rc::clone(tree.deref()).borrow().get_total_size(), 48381165)
+    }
 }