day02: part2

.gitignore

@@ -69,3 +69,6 @@ docgen_tmp/
 
 ### nix ###
 result
+
+### local ###
+src/data

src/day01.zig

@@ -1,4 +1,64 @@
 const std = @import("std");
 const util = @import("util.zig");
 
-pub fn main() !void {}
+pub fn main() !void {
+    const input = @embedFile("data/day01.txt");
+    const sln = try solve(input);
+    std.debug.print("Solution: {d}", .{sln});
+}
+
+const numbers = [_][]const u8{ "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
+const zero = @as(u8, '0');
+
+fn solve(input: []const u8) !u32 {
+    var sum: u32 = 0;
+
+    var it = std.mem.splitAny(u8, input, "\n");
+    while (it.next()) |line| {
+        if (std.mem.eql(u8, "", line)) {
+            continue;
+        }
+
+        var first: u8 = 0;
+        var last: u8 = 0;
+
+        for (0..line.len) |offset| {
+            var n: u8 = 0; // ascii value
+            if (line[offset] >= '0' and line[offset] <= '9') {
+                n = line[offset];
+            } else {
+                inline for (numbers, 0..) |word, value| {
+                    if (std.mem.startsWith(u8, line[offset..], word)) {
+                        n = value + zero;
+                        break;
+                    }
+                }
+            }
+            if (n != 0) {
+                if (first == 0) {
+                    first = n;
+                }
+                last = n;
+            }
+        }
+
+        const cal_value = (first - zero) * 10 + (last - zero);
+        sum += cal_value;
+    }
+
+    return sum;
+}
+
+test "sample" {
+    const input =
+        \\two1nine
+        \\eightwothree
+        \\abcone2threexyz
+        \\xtwone3four
+        \\4nineeightseven2
+        \\zoneight234
+        \\7pqrstsixteen
+    ;
+    const sln = try solve(input);
+    try std.testing.expectEqual(@as(u32, 281), sln);
+}