add tests, docs, demo, and serve steps to build.zig

build.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-pub fn build(b: *std.Build) void {
+pub fn build(b: *std.Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
@@ -9,11 +9,98 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
+    const lib_test = b.addTest(.{ .root_module = lib_module, .name = "lib tests" });
+    const lib_test_run = b.addRunArtifact(lib_test);
 
     const server_module = b.addModule("crdt_server", .{
         .root_source_file = b.path("crdt-server/src/root.zig"),
         .target = target,
         .optimize = optimize,
     });
     server_module.addImport("crdt", lib_module);
+    const server_test = b.addTest(.{ .root_module = server_module, .name = "server tests" });
+    const server_test_run = b.addRunArtifact(server_test);
+
+    const server_main = b.createModule(.{
+        .root_source_file = b.path("crdt-server/src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    server_main.addImport("crdt-server", server_module);
+
+    const server_exe = b.addExecutable(.{
+        .name = "crdt-server",
+        .root_module = server_main,
+    });
+
+    const run_server = b.addRunArtifact(server_exe);
+    if (b.args) |args| {
+        run_server.addArgs(args);
+    }
+
+    const demo_module = b.createModule(.{
+        .root_source_file = b.path("crdt-demo/src/demo.zig"),
+        .target = b.resolveTargetQuery(.{ .cpu_arch = .wasm32, .os_tag = .freestanding }),
+        .optimize = optimize,
+    });
+    demo_module.addImport("crdt", lib_module);
+
+    const demo_wasm = b.addExecutable(.{
+        .name = "crdt-demo",
+        .root_module = demo_module,
+    });
+    demo_wasm.entry = .disabled;
+    demo_wasm.rdynamic = true;
+
+    const install_demo_wasm = b.addInstallArtifact(demo_wasm, .{ .dest_dir = .{ .override = .{ .custom = "www" } } });
+    const install_demo_static = b.addInstallDirectory(.{
+        .source_dir = b.path("crdt-demo/www"),
+        .install_dir = .prefix,
+        .install_subdir = "www",
+    });
+
+    const python = try b.findProgram(&.{ "python3", "python", "py" }, &.{});
+    const run_demo = b.addSystemCommand(&.{
+        "sh", "-c",
+        b.fmt(
+            "trap 'kill 0' INT; {s} -m http.server -d {s} & {s} >/dev/null 2>&1 & wait",
+            .{
+                python,
+                b.getInstallPath(.prefix, "www"),
+                b.getInstallPath(.{ .custom = "bin" }, "crdt-server"),
+            },
+        ),
+    });
+    run_demo.step.dependOn(&install_demo_wasm.step);
+    run_demo.step.dependOn(&install_demo_static.step);
+    run_demo.step.dependOn(&b.addInstallArtifact(server_exe, .{}).step);
+
+    const demo_step = b.step("demo", "builds and hosts the demo and starts the CRDT server");
+    demo_step.dependOn(&run_demo.step);
+
+    const serve_step = b.step("serve", "runs the CRDT server");
+    serve_step.dependOn(&run_server.step);
+
+    const test_step = b.step("test", "runs crdt-lib and crdt-server tests");
+    test_step.dependOn(&lib_test_run.step);
+    test_step.dependOn(&server_test_run.step);
+
+    const docs_step = b.step("docs", "generate documentation for crdt-server and crdt-lib");
+    const lib_docs_install = b.addInstallDirectory(.{
+        .install_dir = .prefix,
+        .install_subdir = "docs/lib",
+        .source_dir = lib_test.getEmittedDocs(),
+    });
+    const server_docs_install = b.addInstallDirectory(.{
+        .install_dir = .prefix,
+        .install_subdir = "docs/server",
+        .source_dir = server_test.getEmittedDocs(),
+    });
+    docs_step.dependOn(&lib_docs_install.step);
+    docs_step.dependOn(&server_docs_install.step);
+
+    const install_step = b.getInstallStep();
+    install_step.dependOn(&install_demo_wasm.step);
+    install_step.dependOn(&install_demo_static.step);
+    b.installArtifact(server_exe);
 }