feat(backend): template support for subpath

Author: ricky8955555

src/App.zig

@@ -205,7 +205,9 @@ fn captureAccess(ctx: *Context, req: *httpz.Request, res: *httpz.Response) !void
             };
             defer parsed.deinit(ctx.allocator);
 
-            response_template.render(parsed, req, writer) catch |err| {
+            const context = response_template.Context{ .request = req, .subpath = subpath };
+
+            response_template.render(parsed, &context, writer) catch |err| {
                 try writer.print("Failed to render template: {any}", .{err});
                 res.setStatus(.internal_server_error);
                 res.content_type = .TEXT;

src/response_template.zig

@@ -4,11 +4,12 @@ const httpz = @import("httpz");
 
 const Template = @import("Template.zig");
 
-const RequestVariables = struct {
+pub const Context = struct {
     request: *httpz.Request,
+    subpath: []const u8,
 
     fn print(context: *const anyopaque, writer: *std.Io.Writer, name: []const u8) anyerror!bool {
-        const self: *const RequestVariables = @ptrCast(@alignCast(context));
+        const self: *const Context = @ptrCast(@alignCast(context));
         var split = std.mem.splitScalar(u8, name, '.');
 
         const first = split.next().?;
@@ -61,14 +62,17 @@ const RequestVariables = struct {
             } else {
                 try writer.writeAll(cookies.header);
             }
+        } else if (std.mem.eql(u8, first, "subpath")) {
+            if (optional_second != null) return false;
+            try writer.writeAll(self.subpath);
         } else {
             return false;
         }
 
         return true;
     }
 
-    fn variables(self: *const RequestVariables) Template.Variables {
+    fn variables(self: *const Context) Template.Variables {
         return .{
             .context = @ptrCast(self),
             .vtable = &.{
@@ -78,9 +82,7 @@ const RequestVariables = struct {
     }
 };
 
-pub fn render(template: Template, request: *httpz.Request, writer: *std.Io.Writer) !void {
-    const request_variables = RequestVariables{ .request = request };
-    const variables = request_variables.variables();
-
+pub fn render(template: Template, context: *const Context, writer: *std.Io.Writer) !void {
+    const variables = context.variables();
     try template.render(writer, variables, .{});
 }