2024 Day 1

2024/src/aoc.zig

@@ -0,0 +1,30 @@
+const std = @import("std");
+
+pub const Lines = struct {
+    buf_reader: std.io.BufferedReader(4096, std.fs.File.Reader),
+    line: std.ArrayList(u8),
+
+    pub fn init(allocator: std.mem.Allocator, file: std.fs.File) Lines {
+        return .{
+            .buf_reader = std.io.bufferedReader(file.reader()),
+            .line = std.ArrayList(u8).init(allocator),
+        };
+    }
+
+    pub fn deinit(self: Lines) void {
+        self.line.deinit();
+    }
+
+    pub fn next(self: *Lines) !?std.ArrayList(u8) {
+        const writer = self.line.writer();
+        const reader = self.buf_reader.reader();
+
+        self.line.clearRetainingCapacity();
+        if (reader.streamUntilDelimiter(writer, '\n', null)) {
+            return self.line;
+        } else |err| switch (err) {
+            error.EndOfStream => return null,
+            else => return err,
+        }
+    }
+};