From fb98b90b7da6d13594b0292b635cb85498583eb9 Mon Sep 17 00:00:00 2001
From: Mathias Magnusson <mathias@magnusson.space>
Date: Mon, 1 Dec 2025 14:04:18 +0100
Subject: aoc2025: copy zig project from 2024 & upgrade to 0.15.2

---
 aoc25/build.zig | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 aoc25/build.zig

(limited to 'aoc25/build.zig')

diff --git a/aoc25/build.zig b/aoc25/build.zig
new file mode 100644
index 0000000..0032005
--- /dev/null
+++ b/aoc25/build.zig
@@ -0,0 +1,97 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+
+    const optimize = b.standardOptimizeOption(.{});
+
+    const generate_main = b.addExecutable(.{
+        .name = "generate_main",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("tools/generate_main.zig"),
+            .target = b.graph.host,
+            .optimize = optimize,
+        }),
+    });
+
+    const download_input = b.addExecutable(.{
+        .name = "download_input",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("tools/download_input.zig"),
+            .target = b.graph.host,
+            .optimize = optimize,
+        }),
+    });
+
+    for (1..13) |day| {
+        const run_download_input = b.addRunArtifact(download_input);
+        run_download_input.addArg(b.fmt("{}", .{day}));
+        const input_path = run_download_input.addOutputFileArg(b.fmt("{}.txt", .{day}));
+        const path = b.path(b.fmt("src/day{}.zig", .{day}));
+
+        for ([_]usize{ 1, 2 }) |part| {
+            const name = b.fmt("day{}p{}", .{ day, part });
+
+            const run_generate_main = b.addRunArtifact(generate_main);
+            run_generate_main.addArg(b.fmt("{}", .{part}));
+            const main_path = run_generate_main.addOutputFileArg(b.fmt("{s}_main.zig", .{name}));
+
+            const exe = b.addExecutable(.{
+                .name = b.fmt("{s}", .{name}),
+                .root_module = b.createModule(.{
+                    .root_source_file = main_path,
+                    .target = target,
+                    .optimize = optimize,
+                }),
+            });
+            exe.root_module.addAnonymousImport("solution", .{
+                .root_source_file = path,
+                .target = target,
+                .optimize = optimize,
+            });
+            exe.root_module.addAnonymousImport("input", .{
+                .root_source_file = input_path,
+                .target = target,
+                .optimize = optimize,
+            });
+
+            const install_artifact = b.addInstallArtifact(exe, .{});
+            const install_step = b.step(b.fmt("{s}-install", .{name}), b.fmt("Install {s} to the output directory", .{name}));
+            install_step.dependOn(&install_artifact.step);
+
+            // This *creates* a Run step in the build graph, to be executed when another
+            // step is evaluated that depends on it. The next line below will establish
+            // such a dependency.
+            const run_cmd = b.addRunArtifact(exe);
+
+            // This allows the user to pass arguments to the application in the build
+            // command itself, like this: `zig build run -- arg1 arg2 etc`
+            if (b.args) |args| {
+                run_cmd.addArgs(args);
+            }
+
+            // This creates a build step. It will be visible in the `zig build --help` menu,
+            // and can be selected like this: `zig build run`
+            // This will evaluate the `run` step rather than the default, which is "install".
+            const run_step = b.step(name, b.fmt("Run {s}", .{name}));
+            run_step.dependOn(&run_cmd.step);
+
+            const exe_unit_tests = b.addTest(.{
+                .root_module = b.createModule(.{
+                    .root_source_file = path,
+                    .target = target,
+                    .optimize = optimize,
+                }),
+                .filters = &.{b.fmt("part{}", .{part})},
+            });
+
+            const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+
+            // Similar to creating the run step earlier, this exposes a `test` step to
+            // the `zig build --help` menu, providing a way for the user to request
+            // running the unit tests.
+            const test_step = b.step(b.fmt("{s}-test", .{name}), b.fmt("Test {s}", .{name}));
+            test_step.dependOn(&run_exe_unit_tests.step);
+        }
+    }
+}
-- 
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