2024: Add build.zig

2024/build.zig

@@ -0,0 +1,33 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const install_all = b.step("install-all", "Install all days");
+    const run_all = b.step("run-all", "Run all days");
+    const num_days = b.option(u32, "num-days", "The number of days to process") orelse 25;
+
+    var day: u8 = 1;
+    while (day <= num_days) : (day += 1) {
+        const str = b.fmt("day{d}", .{day});
+        const file = b.fmt("{s}.zig", .{str});
+
+        const exe = b.addExecutable(.{
+            .name = str,
+            .root_source_file = b.path(file),
+            .target = target,
+            .optimize = optimize,
+        });
+
+        const install_exe = b.addInstallArtifact(exe, .{});
+        const install_step = b.step(b.fmt("install_{s}", .{str}), b.fmt("Install {s}", .{str}));
+        install_step.dependOn(&install_exe.step);
+        install_all.dependOn(&install_exe.step);
+
+        const run_exe = b.addRunArtifact(exe);
+        const run_step = b.step(b.fmt("run_{s}", .{str}), b.fmt("Run {s}", .{str}));
+        run_step.dependOn(&run_exe.step);
+        run_all.dependOn(&run_exe.step);
+    }
+}