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Zig nif library

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zigler lib zig templates on_upgrade.zig.eex
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lib/zig/templates/on_upgrade.zig.eex 

// TODO: deprecate this content being an elixir template and provide it entirely

// using Zig comptime logic.

beam.context.env = env;

beam.context.mode = .callback;

beam.context.allocator = beam.allocator;

<% name = @on_upgrade.name %>

<%= if @on_upgrade.arity == 3 do %>

// following type is guaranteed to exist as per semantic analysis.

const Payload = @typeInfo(@TypeOf(nif.<%= @on_upgrade.name%>)).@"fn".params[2].type.?;

const payload = beam.get(Payload, .{.v = load_info}, .{}) catch return -1;

<%= case @on_upgrade.return do %>

  <% %Zig.Type.Enum{} -> %>

return @intFromEnum(nif.<%= name %>(@ptrCast(priv_data), @ptrCast(old_priv_data), payload));

  <% %Zig.Type.Integer{} -> %>

return @intCast(nif.<%= name %>(@ptrCast(priv_data), @ptrCast(old_priv_data), payload));

  <% %Zig.Type.Error{child: :void} -> %>

nif.<%= name %>(@ptrCast(priv_data), @ptrCast(old_priv_data), payload) catch return -1;

return 0;

  <% :void -> %>

nif.<%= name %>(@ptrCast(priv_data), @ptrCast(old_priv_data), payload);

return 0;

<% end %>

<% else %>

return nif.<%= name %>(env, @ptrCast(priv_data), @ptrCast(old_priv_data), load_info);

<% end %>