stop gap

day7/input

@@ -0,0 +1,23 @@
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k

day7/src/main.rs

@@ -1,47 +1,70 @@
+use std::cell::RefCell;
 use std::fs::File;
-use std::rc::Rc;
 use std::io::{prelude::*, BufReader};
+use std::rc::Rc;
 
+trait Sizer {
+    fn size(&self) -> usize;
+}
+
+#[derive(Clone, Debug)]
 struct MyFile {
-    name: String,
+    _name: String,
     size: usize,
 }
 
-struct MyDir <'a>{
-    name: String,
-    objects: Vec<FileSystemTypes<'a>>,
-    //TODO should this bee reference counted
-    parent_dir: Option<&'a MyDir<'a>>,
+impl Sizer for MyFile {
+    fn size(&self) -> usize {
+        self.size
+    }
 }
 
-impl <'a> MyDir<'a> {
-    fn move_up(&self) -> Option<&MyDir>{
-        self.parent_dir
+#[derive(Clone, Debug)]
+struct MyDir {
+    name: String,
+    objects: Vec<FileSystemTypes>,
+    parent_dir: Option<Rc<RefCell<MyDir>>>,
+}
+
+impl MyDir {
+    fn move_up(&self) -> Option<Rc<RefCell<MyDir>>> {
+        self.parent_dir.clone()
     }
 
-    fn move_down(&self, dir:impl Into<String>) -> Option<&MyDir> {
+    fn move_down(&self, dir: impl Into<String>) -> Option<Rc<RefCell<MyDir>>> {
         let dir = dir.into();
-        self.objects.iter()
+        Some(
+            self.objects
+                .iter()
                 .filter_map(|x| match x {
                     FileSystemTypes::MyDir(y) => Some(y),
                     _ => None,
                 })
-                    .find(|x| x.name == dir)
+                .find(|x| *x.borrow().name == dir)?
+                .clone(),
+        )
     }
-    fn touch(&mut self, name: impl Into<String>, size:usize) {
-        self.objects.push(FileSystemTypes::MyFile(MyFile{name:name.into(), size}));
+    fn touch(&mut self, name: impl Into<String>, size: usize) {
+        self.objects.push(FileSystemTypes::MyFile(MyFile {
+            _name: name.into(),
+            size,
+        }));
     }
-    fn mkdir(&'a mut self, name: impl Into<String>) {
-        self.objects.push(FileSystemTypes::MyDir(MyDir::new(name, Some(self))));
+    //has to be  a static method...
+    fn mkdir(self_: Rc<RefCell<MyDir>>, name: impl Into<String>) {
+        self_
+            .borrow_mut()
+            .objects
+            .push(FileSystemTypes::MyDir(Rc::new(RefCell::new(MyDir::new(
+                name,
+                Some(self_.clone()),
+            )))));
+        //me.clone()
     }
 
-
-    fn new(name: impl Into<String>, parent_dir: Option<&'a MyDir<'a>>) -> Self {
+    fn new(name: impl Into<String>, parent_dir: Option<Rc<RefCell<MyDir>>>) -> Self {
         let name: String = name.into();
-        let parent_dir = match parent_dir {
-            Some(x) => Some(x),
-            None => None,
-        };
+        let parent_dir = parent_dir.map(|x| x.clone());
         MyDir {
             name,
             objects: Vec::new(),
@@ -49,10 +72,28 @@ impl <'a> MyDir<'a> {
         }
     }
 }
+impl Sizer for MyDir {
+    fn size(&self) -> usize {
+        self.objects
+            .iter()
+            .map(|obj|  obj.size())
+            .sum::<usize>()
+    }
+}
 
-enum FileSystemTypes <'a>{
+#[derive(Clone, Debug)]
+enum FileSystemTypes {
     MyFile(MyFile),
-    MyDir(MyDir<'a>),
+    MyDir(Rc<RefCell<MyDir>>),
+}
+
+impl Sizer for FileSystemTypes {
+    fn size(&self) -> usize {
+        match self {
+            FileSystemTypes::MyFile(file) => file.size(),
+            FileSystemTypes::MyDir(dir) => dir.borrow().size(),
+        }
+    }
 }
 
 fn main() -> std::io::Result<()> {
@@ -61,21 +102,23 @@ fn main() -> std::io::Result<()> {
     let reader = BufReader::new(file);
 
     //create root file object on heap
-    let root = MyDir::new("/", None);
+    let root = Rc::new(RefCell::new(MyDir::new("/", None)));
     let mut ls_mode = false;
     //set a pointer to the currently on MyDir, in this case start at roo
-    let mut cursor = Box::from(&root).as_mut();
+    let mut cursor = root.clone();
 
     // loop through the input files lines
     reader.lines().for_each(|line| {
         //need to unwrap the line cause lines() returns an Option
         let line = line.unwrap();
         //if we are listing files we need to  get the information from the input
-        if ls_mode && line.as_bytes()[0] != '$' as u8 {
+        if ls_mode && line.as_bytes()[0] != b'$' {
             //do adding to cursor
             match line.split_whitespace().collect::<Vec<_>>()[..] {
-                ["dir", name] =>  cursor.mkdir(name),
-                [size, name] => cursor.touch(name, size.parse::<usize>().unwrap()),
+                ["dir", name] => MyDir::mkdir(cursor.clone(), name),
+                [size, name] => cursor
+                    .borrow_mut()
+                    .touch(name, size.parse::<usize>().unwrap()),
                 _ => panic!("oops {}", line),
             };
             // end the for_each
@@ -83,14 +126,21 @@ fn main() -> std::io::Result<()> {
         }
         ls_mode = false;
         //parse all other lines as commands
-        match line.split_whitespace().collect::<Vec<_>>()[..] {
-            ["$", "ls"] => ls_mode = true,
-            ["$", "cd", "/"] => cursor = Box::from(&root).as_mut(), //set current directory back to root
-            ["$", "cd", ".."] => cursor = Box::from(cursor.move_up().unwrap()).as_mut(),
-            ["$", "cd", dir] => cursor = Box::from(cursor.move_down(dir).unwrap()).as_mut(),
+        cursor = match line.split_whitespace().collect::<Vec<_>>()[..] {
+            ["$", "ls"] => {
+                ls_mode = true;
+                cursor.clone()
+            }
+            ["$", "cd", "/"] => root.clone(), //set current directory back to root
+            ["$", "cd", ".."] => cursor.borrow().move_up().unwrap().clone(),
+            ["$", "cd", dir] => cursor.borrow().move_down(dir).unwrap().clone(),
             _ => panic!("unknown command {}", line),
         }
     });
+    let mut part1 = vec![root.borrow().size()];
+    // TODO do a recursive function that get current directory size and puts it in vector then go
+    // into each sub directory
+    // find all less than 100_000 and sum
 
     Ok(())
 }