zig: 2025 day 1

Author: Peter554

.github/workflows/ci-2025-zig.yml

@@ -0,0 +1,23 @@
+name: CI 2025 Zig
+
+on:
+  push:
+    branches:
+      - master
+      - "2025-zig-*"
+    paths:
+      - "2025/zig/**"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    name: Build and Test
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: mlugg/setup-zig@v2
+        with:
+          version: 0.15.1
+
+      - run: zig build test
+        working-directory: ./2025/zig

2025/zig/.gitignore

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+.zig-cache/
+
+# Created by https://www.toptal.com/developers/gitignore/api/zig
+# Edit at https://www.toptal.com/developers/gitignore?templates=zig
+
+### zig ###
+# Zig programming language
+
+zig-cache/
+zig-out/
+build/
+build-*/
+docgen_tmp/
+
+# End of https://www.toptal.com/developers/gitignore/api/zig

2025/zig/build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+    const day_filter = b.option(u8, "day", "Specific day to test (1-25)");
+
+    const test_step = b.step("test", "Run all tests");
+
+    for (1..26) |day| {
+        if (day_filter) |d| {
+            if (d != day) continue;
+        }
+
+        const path = b.fmt("src/day{d:0>2}.zig", .{day});
+
+        if (std.fs.cwd().access(path, .{})) {
+            const day_tests = b.addTest(.{
+                .root_module = b.createModule(.{
+                    .root_source_file = b.path(path),
+                    .target = target,
+                    .optimize = optimize,
+                }),
+            });
+            test_step.dependOn(&b.addRunArtifact(day_tests).step);
+        } else |_| {}
+    }
+}

2025/zig/src/day01.zig

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+const std = @import("std");
+
+fn part1() u64 {
+    return 42;
+}
+
+test "part 1" {
+    try std.testing.expectEqual(42, part1());
+}