Eh... it"s not drawing the input lines... fuck this.

Fortune for day14's current commit: Small curse − 小凶

day14/Cargo.lock

@@ -26,6 +26,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -177,6 +183,9 @@ checksum = "db6d7e329c562c5dfab7a46a2afabc8b987ab9a4834c9d1ca04dc54c1546cef8"
 [[package]]
 name = "linebuffer"
 version = "0.1.1"
+dependencies = [
+ "arrayvec",
+]
 
 [[package]]
 name = "log"

day14/src/grid.rs

@@ -1,3 +1,180 @@
 //! Grid of lines and sands
 use super::*;
+use std::{
+    collections::BTreeMap,
+    borrow::Cow,
 
+    fmt,
+};
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Default, Copy)]
+#[repr(u8)]
+pub enum Cell
+{
+    #[default]
+    Air = b'.',
+    Wall = b'#',
+    Settled = b'O',
+    Falling = b'~',
+    Source = b'+',
+}
+
+impl From<Cell> for u8
+{
+    #[inline(always)] 
+    fn from(from: Cell) -> Self
+    {
+	from as u8
+    }
+}
+
+impl fmt::Display for Cell
+{
+    #[inline] 
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	write!(f, "{}", u8::from(*self) as char)
+    }
+}
+
+
+#[derive(Debug, Clone, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Grid
+{
+    map: BTreeMap<Point, Cell>,
+}
+
+impl Grid
+{
+    #[inline] 
+    pub const fn new() -> Self
+    {
+	Self {
+	    map: BTreeMap::new(),
+	}
+    }
+
+    #[inline(always)] 
+    pub fn insert_single(&mut self, point: Point, cell: Cell) -> Option<Cell>
+    {
+	self.map.insert(point, cell)
+    }
+
+    #[inline] 
+    pub fn draw_line_with<F>(&mut self, line: Line, mut with: F)
+    where F: for<'a> FnMut(&'a Point) -> Cell
+    {
+	for point in line.unroll() {
+	    let cell = with(&point);
+	    self.map.insert(point, cell);
+	}
+    }
+    
+    #[inline] 
+    pub fn draw_line(&mut self, line: Line, cell: Cell)
+    {
+	self.draw_line_with(line, move |_| cell)
+    }
+
+    #[inline] 
+    pub fn draw_lines_with<I,F>(&mut self, line: I, mut with: F)
+    where F: for<'a> FnMut(&'a Point) -> Cell,
+	  I: IntoIterator<Item = Line>
+    {
+	for point in line.into_iter().map(|x| x.normalised().unroll()).flatten() {
+	    let cell = with(&point);
+	    self.map.insert(point, cell);
+	}
+    }
+
+    /// Draw these lines with this cell
+    #[inline] 
+    pub fn draw_lines(&mut self, lines: impl IntoIterator<Item = Line>, cell: Cell)
+    {
+	self.draw_lines_with(lines, move |_| cell)
+    }
+
+    /// Add the source to the grid
+    #[inline(always)] 
+    pub fn draw_source(&mut self, source: Point)
+    {
+	self.map.insert(source, Cell::Source);
+    }
+}
+
+/// Create a new sparse grid, returns the point.
+///
+/// A sparse grid does not draw air, only the specified `walls`.
+#[inline]
+pub fn sparse_grid(walls: Lines) -> (grid::Grid, Point)
+{
+    let mut grid = grid::Grid::new();
+    // Add source
+    grid.draw_source(ORIGIN_POINT);
+
+    // Draw walls
+    grid.draw_lines(walls, Cell::Wall);
+
+    (grid, ORIGIN_POINT)
+}
+
+// Non-drawing grid functions
+impl Grid
+{
+    /// Number of points in the grid
+    #[inline] 
+    pub fn len(&self) -> usize
+    {
+	self.map.len()
+    }
+    
+    /// Find the highest point in the collection
+    #[inline(always)] 
+    pub fn find_high_bound(&self) -> Point
+    {
+	let x = self.map.keys().max_by(|a, b| u64::cmp(&a.x, &b.x)).map(|x| x.x).unwrap_or(0);
+	let y = self.map.keys().max_by(|a, b| u64::cmp(&a.y, &b.y)).map(|y| y.y).unwrap_or(0);
+	Point{ x, y }
+    }
+    
+    /// Find the lowest point in the collection
+    #[inline(always)] 
+    pub fn find_low_bound(&self) -> Point
+    {
+	let x = self.map.keys().min_by(|a, b| u64::cmp(&a.x, &b.x)).map(|x| x.x).unwrap_or(0);
+	let y = self.map.keys().min_by(|a, b| u64::cmp(&a.y, &b.y)).map(|y| y.y).unwrap_or(0);
+	Point{ x, y }
+    }
+
+    /// Find the low and high bound as a flattened line
+    #[inline] 
+    pub fn find_bound(&self) -> Line
+    {
+	let start = self.find_low_bound();
+	let end = self.find_high_bound();
+	Line{ start, end }
+    }
+    
+    /// Iterate over a sparse grid, bounded by `bound`, any not set cells will be drawn with air.
+    #[inline] 
+    pub fn iterate_sparse<'g>(&'g self, bound: Line) -> impl Iterator<Item = &'g Cell> + 'g
+    {
+	const AIR: Cell = Cell::Air;
+	//let mut grid = start.map.iter().fuse().peekable();
+	bound.normalised().unroll().into_iter()
+	    .map(move |point| {
+		if let Some(cell) = self.map.get(&point) {
+		    // Contains the point, return that reference
+		    return cell;
+		}
+		/*
+		if let Some(&(next_wall, cell)) = grid.peek() {
+		if next_wall == &point  {
+		// Take this point off the iterator if it matches
+		return grid.next().unwrap().1;
+	    }
+	    }*/
+		&AIR
+	    })
+    }
+}

day14/src/main.rs

@@ -7,6 +7,7 @@ use std::{
     io,
     iter,
     path::Path,
+    fmt,
 };
 
 use color_eyre::{
@@ -29,14 +30,27 @@ const _:() = {
 
 mod grid;
 
+/// Base coordinate
+pub type Coord = u64;
+
 /// A point is a vector
 #[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Copy)]
 #[repr(simd)]
-struct Point {
-    pub x: u64,
-    pub y: u64,
+pub struct Point {
+    pub x: Coord,
+    pub y: Coord,
 }
 
+impl fmt::Display for Point
+{
+    #[inline] 
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	write!(f, "{},{}", self.x, self.y)
+    }
+}
+
+
 impl str::FromStr for Point
 {
     type Err = <u64 as str::FromStr>::Err;
@@ -52,14 +66,86 @@ impl str::FromStr for Point
 
 /// A `Line` is potentially two X any Ys
 #[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Copy)]
-struct Line {
+pub struct Line {
     start: Point,
     end: Point,
 }
 
+impl fmt::Display for Line
+{
+    #[inline] 
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	write!(f, "{} -> {}", self.start, self.end)
+    }
+}
+
+
+impl From<Point> for (Coord, Coord)
+{
+    #[inline] 
+    fn from(from: Point) -> Self
+    {
+	(from.x, from.y)
+    }
+}
+
+impl From<(Coord, Coord)> for Point
+{
+    #[inline(always)] 
+    fn from((x,y): (Coord, Coord)) -> Self
+    {
+	Self {x,y}
+    }
+}
+
+
+impl Line {
+    
+    fn normalised(self) -> Self
+    {
+	let x = std::cmp::min(self.start.x, self.end.x);
+	let y = std::cmp::min(self.start.y, self.end.y);
+	let start = Point {x,y};
+	
+	let x = std::cmp::max(self.start.x, self.end.x);
+	let y = std::cmp::max(self.start.y, self.end.y);
+	let end = Point {x,y};
+
+	Self {
+	    start, end
+	}
+    }
+    #[inline] 
+    fn normalise(&mut self)
+    {
+	*self = self.clone().normalised();
+    }
+    #[inline] 
+    pub fn over_horizontal(&self) -> impl IntoIterator<Item = Point> + 'static
+    {
+	let x = self.start.x;
+	let y = self.start.y;
+	(self.start.x..=self.end.x).map(move |x| (x, y).into())
+    }
+    #[inline] 
+    pub fn over_vertical(&self) -> impl IntoIterator<Item = Point> + 'static
+    {
+	let x = self.start.x;
+	(self.start.y..=self.end.y).map(move |y| (x, y).into())
+    }
+
+    #[inline] 
+    pub fn unroll(&self) -> impl IntoIterator<Item = Point> + 'static
+    {
+	self.over_horizontal().into_iter()
+	    .chain(self.over_vertical().into_iter())
+    }
+}
+
 /// A single parsed line into `Line`s.
 #[derive(Debug, Clone, Default)]
-struct Lines {
+pub struct Lines {
     lines: Vec<Line>,
 }
 
@@ -75,6 +161,28 @@ impl IntoIterator for Lines
     }
 }
 
+impl FromIterator<Lines> for Lines
+{
+    #[inline] 
+    fn from_iter<I: IntoIterator<Item=Lines>>(lines: I) -> Self
+    {	
+	Self {
+	    lines: Self::flattening(lines).into_iter().collect(),
+	}
+    }
+}
+
+impl FromIterator<Line> for Lines
+{
+    #[inline] 
+    fn from_iter<I: IntoIterator<Item=Line>>(lines: I) -> Self
+    {	
+	Self {
+	    lines: lines.into_iter().collect()
+	}
+    }
+}
+
 
 impl Lines {
     #[inline]
@@ -84,16 +192,16 @@ impl Lines {
 	self
     }
     #[inline(always)] 
-    pub fn flattening<'a>(lines: impl IntoIterator<Item = Self> + 'a) -> impl IntoIterator<Item = Line> + 'a
+    pub fn flattening<'a, T: 'a>(lines: impl IntoIterator<Item = T> + 'a) -> impl IntoIterator<Item = Line> + 'a
+    where T: IntoIterator<Item = Line>
+	
     {
-	lines.into_iter().map(|x| x.lines.into_iter()).flatten()
+	lines.into_iter().map(|x| x.into_iter()).flatten()
     }
     #[inline] 
     pub fn flatten(lines: impl IntoIterator<Item = Self>) -> Self
     {
-	Self {
-	    lines: Self::flattening(lines).into_iter().collect(),
-	}
+	lines.into_iter().collect()
     }
 }
 
@@ -190,16 +298,38 @@ fn init() -> eyre::Result<()>
     Ok(())
 }
 
+fn draw_grid<W: io::Write>(mut to: W, bound: Line, grid: &grid::Grid) -> io::Result<()>
+{
+    for cells in grid.iterate_sparse(bound).chunk((bound.end.x - bound.start.x) as usize)
+    {
+	for cell in cells {
+	    write!(&mut to, "{}", cell)?;
+	}
+	write!(&mut to, "\n")?;
+    }
+    Ok(())
+}
+
+/// Simulate the grid falling from `origin` in `grid`.
+fn simulate(grid: &mut grid::Grid, origin: &Point) -> eyre::Result<()>
+{
+
+    Ok(())
+}
+
 fn main() -> eyre::Result<()> {
     init().wrap_err("Failed to install handlers and hooks")?;
 
-    // Input
-    let input = load_input_from(INPUT_FILENAME)
-	.wrap_err("Failed to open input file")?;
+    // Parsed input
+    let input = {
+	// Input file
+	let input = load_input_from(INPUT_FILENAME)
+	    .wrap_err("Failed to open input file")?;
 
-    // Parse input
-    let input = Input::parse(input)
-	.wrap_err("Failed to parse input")?;
+	// Parse input
+	Input::parse(input)
+	    .wrap_err("Failed to parse input")?
+    };
 
     if cfg!(feature="status") {
 	debug!("Read {} zipped lines from input", input.zipped_len());
@@ -207,12 +337,23 @@ fn main() -> eyre::Result<()> {
 	trace!("Input is:\n```{input:#?}```");
     }
     
-    todo!("Deconstruction, draw, and simulation from `ORIGIN_POINT`");
-    //TODO: Deconstruct each `Line` into the horizontal and vertical movements
+    //Draw lines into grid before starting simulation of sand from `origin`.
+    let (mut grid, origin) = grid::sparse_grid(input.all);
 
-    //TODO: Draw lines into grid before starting simulation of sand from `ORIGIN_POINT`.
+    debug!("Read {} unzipped lines", grid.len());
 
     //TODO: Simulate falling, adding and counting each stopped particle until the sand drops below the bottom of the lowest vertical line.
+    simulate(&mut grid, &origin)
+	.wrap_err("Failed to simulate grid")?;
+
+    // Draw grid
+    if cfg!(feature="status")
+    {
+	let bound = grid.find_bound();
+	debug!("Current map (bound: {}):", bound);
+	draw_grid(io::stderr().lock(), bound, &grid).wrap_err("Failed to draw grid to stderr")?;
+    }
+    
 
     Ok(())
 }