Added a build for web option

build.zig

@@ -1,4 +1,9 @@
 const std = @import("std");
+const sokol = @import("sokol");
+
+const title = "sok";
+
+const buildForWeb = false;
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
@@ -6,10 +11,11 @@ pub fn build(b: *std.Build) void {
 
     const dep_sokol = b.dependency("sokol", .{ .target = target, .optimize = optimize });
 
-    // Exe
+    if (!buildForWeb) {
+        // Native exe
 
         const exe = b.addExecutable(.{
-        .name = "sok",
+            .name = title,
             .root_source_file = b.path("src/main.zig"),
             .target = target,
             .optimize = optimize,
@@ -46,8 +52,36 @@ pub fn build(b: *std.Build) void {
             run_cmd.addArgs(args);
         }
 
-    const run_step = b.step("run", "Run the app");
+        const run_step = b.step("run", "Run" ++ title ++ " as native app");
         run_step.dependOn(&run_cmd.step);
+    } else {
+        // Web
+
+        const wasmLib = b.addStaticLibrary(.{
+            .name = title,
+            .target = target,
+            .optimize = optimize,
+            .root_source_file = b.path("src/pacman.zig"),
+        });
+        wasmLib.root_module.addImport("sokol", dep_sokol.module("sokol"));
+
+        // create a build step which invokes the Emscripten linker
+        const emsdk = dep_sokol.builder.dependency("emsdk", .{});
+        const link_step = try sokol.emLinkStep(b, .{
+            .lib_main = wasmLib,
+            .target = target,
+            .optimize = optimize,
+            .emsdk = emsdk,
+            .use_webgl2 = true,
+            .use_emmalloc = true,
+            .use_filesystem = false,
+            .shell_file_path = dep_sokol.path("src/sokol/web/shell.html").getPath(b),
+        });
+        // ...and a special run step to start the web build output via 'emrun'
+        const run = sokol.emRunStep(b, .{ .name = "sok", .emsdk = emsdk });
+        run.step.dependOn(&link_step.step);
+        b.step("run", "Run " ++ title ++ " as wasm").dependOn(&run.step);
+    }
 
     // Tests
 
@@ -62,3 +96,12 @@ pub fn build(b: *std.Build) void {
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_exe_unit_tests.step);
 }
+
+// for web builds, the Zig code needs to be built into a library and linked with the Emscripten linker
+fn buildWeb(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.Build.OptimizeMode, dep_sokol: *std.Build.Dependency) !void {
+    _ = b; // autofix
+    _ = target; // autofix
+    _ = optimize; // autofix
+    _ = dep_sokol; // autofix
+
+}