Adding initial processing of file into a searchable map.

2024/rust/src/day4.rs

@@ -1,15 +1,39 @@
 use crate::Solution;
+use std::fs;
+use std::process;
 
 pub fn run_day_4() -> Solution {
+    let file = fs::read_to_string("./inputs/day4test.txt").expect("Unable to parse file");
+    let search_map = build_search_map(&file);
+    // @here you are Dan
+    // this is now creating a vector which you can iterator over
+    // will need to work out logic to go through each letter
+    // and detect if it is part of a match or now
+    // somehow keeping track of past matches
+    // need to do in all directions and backwards
+    // this is...complicated.
+    dbg!(search_map[0][2]);
 
-    // Lets solve day 4 here!
-
+    // Return the solution
     let solution = Solution {
         day: 4,
         answer_1: "test".to_string(),
         answer_2: "another".to_string(),
     };
-
     solution
-
 }
+
+fn build_search_map(row: &str) -> Vec<Vec<char>> {
+    let mut search_map: Vec<Vec<char>> = vec!();
+    for line in row.lines() {
+        let char_vec: Vec<char> = line_to_chars(&line);
+        search_map.push(char_vec.clone()); 
+    }
+    search_map
+}
+
+
+fn line_to_chars(row_line: &str) -> Vec<char> {
+    row_line.chars().collect()
+}
+