Start day 6

day_06/src/main.rs

@@ -1,3 +1,60 @@
-fn main() {
-    println!("Hello, world!");
+use std::{
+    env,
+    error::Error,
+    fs::File,
+    io::{BufReader, prelude::*},
+};
+
+fn load_map(input_file: &str) -> Result<(Vec<Vec<bool>>, (usize, usize)), Box<dyn Error>> {
+    let buffer = BufReader::new(File::open(input_file)?);
+    let mut lines = buffer.lines().peekable();
+
+    let width = match lines.peek() {
+        Some(l) => match l {
+            Ok(li) => li.len(),
+            Err(_) => Err("Error reading first line of map file")?,
+        },
+        None => Err("Cannot load empty map file.")?,
+    };
+
+    let mut data: Vec<Vec<bool>> = Vec::new();
+    let mut guard_position = (0, 0);
+
+    for (y, line) in lines.enumerate() {
+        let line = line?;
+        if line.len() != width {
+            println!("{}", line);
+            Err("Line length of input are not consistent")?;
+        }
+        let parsed_data: Vec<bool> = line
+            .chars()
+            .enumerate()
+            .map(|(x, c)| {
+                if c == '^' {
+                    guard_position = (x, y);
+                };
+                c == '#'
+            })
+            .collect();
+        data.push(parsed_data);
+    }
+    let height = data.len();
+
+    Ok((data, guard_position))
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // Handle command input
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 {
+        panic!(
+            "{} must be run with a single argument of files name!",
+            &args[0]
+        )
+    }
+    let input_file = &args[1];
+    let data = load_map(input_file)?;
+    println!("{:?}", data);
+
+    Ok(())
 }