scripted_ui_swap_unit.hpp

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#pragma once

 
#include <pulp/format/reload/live_swap_transaction.hpp>
#include <pulp/view/scripted_ui.hpp>
 
#include <filesystem>
#include <string>
#include <utility>
 
namespace pulp::format::reload {
 
class ScriptedUiSwapUnit : public SwapUnit {
public:
    ScriptedUiSwapUnit(view::ScriptedUiSession& session,
                       std::filesystem::path new_script,
                       std::string stage_name = "ux")
        : session_(session),
          new_script_(std::move(new_script)),
          name_(std::move(stage_name)) {}
 
    std::string name() const override { return name_; }
 
    SwapStage to_stage() override {
        prev_script_ = session_.script_path();   // pre-transaction UI, for rollback
        return SwapStage{
            name_,
            [this] { return session_.reload_from(new_script_); },
            [this] {
                // Re-apply the previous bundle if we actually changed it. (No-op
                // when the swap targets the same path.) reload_from is last-good,
                // so a failed rollback leaves a valid UI rather than a broken one.
                if (prev_script_ != new_script_)
                    (void)session_.reload_from(prev_script_);
            }};
    }
 
private:
    view::ScriptedUiSession& session_;
    std::filesystem::path new_script_;
    std::filesystem::path prev_script_;
    std::string name_;
};
 
}  // namespace pulp::format::reload