advent-of-code/2024/util.zig

const std = @import("std");
const print = std.debug.print;

pub fn readAllInput(day: u8, allocator: std.mem.Allocator) ![]const u8 {
    var fileName: [16]u8 = undefined;
    const inputFile = try std.fmt.bufPrint(&fileName, "day{d}.txt", .{day});
    const file = try std.fs.cwd().openFile(inputFile, .{});
    defer file.close();
    const stat = try file.stat();
    return try file.reader().readAllAlloc(allocator, stat.size);
}

pub fn inputToArrayList(comptime T: type, allocator: std.mem.Allocator, input: []const u8) !std.ArrayList(T) {
    var out = std.ArrayList(T).init(allocator);
    errdefer out.deinit();
    var items = std.mem.tokenizeScalar(u8, input, ' ');
    while (items.next()) |item| {
        try out.append(try std.fmt.parseInt(T, item, 10));
    }
    return out;
}