245 lines
7.5 KiB
C++
245 lines
7.5 KiB
C++
#ifndef context_hh_INCLUDED
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#define context_hh_INCLUDED
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#include "selection.hh"
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#include "optional.hh"
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#include "utils.hh"
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#include <functional>
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namespace Kakoune
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{
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class Window;
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class Buffer;
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class Client;
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class Scope;
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class InputHandler;
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class DisplayLine;
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class KeymapManager;
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class AliasRegistry;
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enum Direction { Backward = -1, Forward = 1 };
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struct JumpList
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{
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void push(SelectionList jump, Optional<size_t> index = {});
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const SelectionList& forward(Context& context, int count);
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const SelectionList& backward(Context& context, int count);
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void forget_buffer(Buffer& buffer);
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friend bool operator==(const JumpList& lhs, const JumpList& rhs)
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{
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return lhs.m_jumps == rhs.m_jumps and lhs.m_current == rhs.m_current;
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}
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friend bool operator!=(const JumpList& lhs, const JumpList& rhs) { return not (lhs == rhs); }
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size_t current_index() const { return m_current; }
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ConstArrayView<SelectionList> get_as_list() const { return m_jumps; }
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private:
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using Contents = Vector<SelectionList, MemoryDomain::Selections>;
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Contents m_jumps;
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size_t m_current = 0;
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};
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using LastSelectFunc = std::function<void (Context&)>;
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// A Context is used to access non singleton objects for various services
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// in commands.
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//
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// The Context object links a Client, a Window, an InputHandler and a
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// SelectionList. It may represent an interactive user window, a hook
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// execution or a macro replay context.
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class Context
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{
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public:
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enum class Flags
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{
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None = 0,
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Draft = 1,
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};
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friend constexpr bool with_bit_ops(Meta::Type<Flags>) { return true; }
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Context(InputHandler& input_handler, SelectionList selections,
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Flags flags, String name = "");
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struct EmptyContextFlag {};
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explicit Context(EmptyContextFlag);
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~Context();
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Context(const Context&) = delete;
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Context& operator=(const Context&) = delete;
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Buffer& buffer() const;
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bool has_buffer() const { return not m_selection_history.empty(); }
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Window& window() const;
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bool has_window() const { return (bool)m_window; }
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Client& client() const;
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bool has_client() const { return (bool)m_client; }
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InputHandler& input_handler() const;
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bool has_input_handler() const { return (bool)m_input_handler; }
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SelectionList& selections(bool update = true);
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const SelectionList& selections(bool update = true) const;
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Vector<String> selections_content() const;
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// Return potentially out of date selections
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SelectionList& selections_write_only();
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void end_selection_edition() { m_selection_history.end_edition(); }
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template<Direction direction>
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void undo_selection_change();
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void change_buffer(Buffer& buffer, Optional<FunctionRef<void()>> set_selection = {});
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void forget_buffer(Buffer& buffer);
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void set_client(Client& client);
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void set_window(Window& window);
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Scope& scope() const;
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OptionManager& options() const { return scope().options(); }
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HookManager& hooks() const { return scope().hooks(); }
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KeymapManager& keymaps() const { return scope().keymaps(); }
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AliasRegistry& aliases() const { return scope().aliases(); }
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FaceRegistry& faces() const { return scope().faces(); }
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void print_status(DisplayLine status) const;
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StringView main_sel_register_value(StringView reg) const;
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const String& name() const { return m_name; }
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void set_name(String name) { m_name = std::move(name); }
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bool is_editing() const { return m_edition_level!= 0; }
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void disable_undo_handling() { m_edition_level = -1; }
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NestedBool& hooks_disabled() { return m_hooks_disabled; }
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const NestedBool& hooks_disabled() const { return m_hooks_disabled; }
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NestedBool& keymaps_disabled() { return m_keymaps_disabled; }
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const NestedBool& keymaps_disabled() const { return m_keymaps_disabled; }
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NestedBool& history_disabled() { return m_history_disabled; }
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const NestedBool& history_disabled() const { return m_history_disabled; }
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Flags flags() const { return m_flags; }
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JumpList& jump_list() { return m_jump_list; }
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void push_jump(bool force = false)
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{
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if (force or not (m_flags & Flags::Draft))
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m_jump_list.push(selections());
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}
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template<typename Func>
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void set_last_select(Func&& last_select) { m_last_select = std::forward<Func>(last_select); }
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void repeat_last_select() { if (m_last_select) m_last_select(*this); }
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Buffer* last_buffer() const;
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private:
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void begin_edition();
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void end_edition();
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int m_edition_level = 0;
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size_t m_edition_timestamp = 0;
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friend struct ScopedEdition;
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friend struct ScopedSelectionEdition;
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Flags m_flags = Flags::None;
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SafePtr<InputHandler> m_input_handler;
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SafePtr<Window> m_window;
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SafePtr<Client> m_client;
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class SelectionHistory {
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public:
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SelectionHistory(Context& context);
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SelectionHistory(Context& context, SelectionList selections);
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void initialize(SelectionList selections);
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bool empty() const { return m_history.empty() and not m_staging; }
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SelectionList& selections(bool update = true);
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void begin_edition();
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void end_edition();
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bool in_edition() const { return m_in_edition; }
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template<Direction direction>
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void undo();
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void forget_buffer(Buffer& buffer);
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private:
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enum class HistoryId : size_t { First = 0, Invalid = (size_t)-1 };
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struct HistoryNode
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{
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HistoryNode(SelectionList selections, HistoryId parent) : selections(selections), parent(parent) {}
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SelectionList selections;
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HistoryId parent;
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HistoryId redo_child = HistoryId::Invalid;
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};
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HistoryId next_history_id() const noexcept { return (HistoryId)m_history.size(); }
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HistoryNode& history_node(HistoryId id) { return m_history[(size_t)id]; }
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const HistoryNode& history_node(HistoryId id) const { return m_history[(size_t)id]; }
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HistoryNode& current_history_node() { kak_assert((size_t)m_history_id < m_history.size()); return m_history[(size_t)m_history_id]; }
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Context& m_context;
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Vector<HistoryNode> m_history;
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HistoryId m_history_id = HistoryId::Invalid;
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Optional<HistoryNode> m_staging;
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NestedBool m_in_edition;
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};
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SelectionHistory m_selection_history;
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String m_name;
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JumpList m_jump_list;
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LastSelectFunc m_last_select;
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NestedBool m_hooks_disabled;
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NestedBool m_keymaps_disabled;
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NestedBool m_history_disabled;
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};
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struct ScopedEdition
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{
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ScopedEdition(Context& context)
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: m_context{context},
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m_buffer{context.has_buffer() ? &context.buffer() : nullptr}
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{ if (m_buffer) m_context.begin_edition(); }
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~ScopedEdition() { if (m_buffer) m_context.end_edition(); }
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Context& context() const { return m_context; }
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private:
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Context& m_context;
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SafePtr<Buffer> m_buffer;
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};
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struct ScopedSelectionEdition
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{
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ScopedSelectionEdition(Context& context)
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: m_context{context},
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m_buffer{not (m_context.flags() & Context::Flags::Draft) and context.has_buffer() ? &context.buffer() : nullptr}
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{ if (m_buffer) m_context.m_selection_history.begin_edition(); }
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ScopedSelectionEdition(ScopedSelectionEdition&& other) : m_context{other.m_context}, m_buffer{other.m_buffer}
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{ other.m_buffer = nullptr; }
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~ScopedSelectionEdition() { if (m_buffer) m_context.m_selection_history.end_edition(); }
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private:
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Context& m_context;
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SafePtr<Buffer> m_buffer;
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};
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}
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#endif // context_hh_INCLUDED
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