Genearte .zig verions of templates to use in production.

examples/demo/build.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const pugz = @import("pugz");
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
@@ -14,22 +15,65 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
-    // Main executable
+    const pugz_mod = pugz_dep.module("pugz");
+
+    // ===========================================================================
+    // Template Compilation Step - OPTIONAL
+    // ===========================================================================
+    // This creates a "compile-templates" build step that users can run manually:
+    //   zig build compile-templates
+    //
+    // Templates are compiled to generated/ and automatically used if they exist
+    const compile_templates = pugz.compile_tpls.addCompileStep(b, .{
+        .name = "compile-templates",
+        .source_dirs = &.{
+            "views/pages",
+            "views/partials",
+        },
+        .output_dir = "generated",
+    });
+
+    const compile_step = b.step("compile-templates", "Compile Pug templates");
+    compile_step.dependOn(&compile_templates.step);
+
+    // ===========================================================================
+    // Main Executable
+    // ===========================================================================
+    // Check if compiled templates exist
+    const has_templates = blk: {
+        var dir = std.fs.cwd().openDir("generated", .{}) catch break :blk false;
+        dir.close();
+        break :blk true;
+    };
+
+    // Build imports list
+    var imports: std.ArrayListUnmanaged(std.Build.Module.Import) = .{};
+    defer imports.deinit(b.allocator);
+
+    imports.append(b.allocator, .{ .name = "pugz", .module = pugz_mod }) catch @panic("OOM");
+    imports.append(b.allocator, .{ .name = "httpz", .module = httpz_dep.module("httpz") }) catch @panic("OOM");
+
+    // Only add templates module if they exist
+    if (has_templates) {
+        const templates_mod = b.createModule(.{
+            .root_source_file = b.path("generated/root.zig"),
+        });
+        imports.append(b.allocator, .{ .name = "templates", .module = templates_mod }) catch @panic("OOM");
+    }
+
     const exe = b.addExecutable(.{
         .name = "demo",
         .root_module = b.createModule(.{
             .root_source_file = b.path("src/main.zig"),
             .target = target,
             .optimize = optimize,
-            .imports = &.{
-                .{ .name = "pugz", .module = pugz_dep.module("pugz") },
-                .{ .name = "httpz", .module = httpz_dep.module("httpz") },
-            },
+            .imports = imports.items,
         }),
     });
 
     b.installArtifact(exe);
 
+    // Run step
     const run_cmd = b.addRunArtifact(exe);
     run_cmd.step.dependOn(b.getInstallStep());