terminal.h

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#pragma once
 
#include "di/container/ring/ring.h"
#include "di/io/vector_writer.h"
#include "dius/sync_file.h"
#include "ttx/cursor_style.h"
#include "ttx/escape_sequence_parser.h"
#include "ttx/focus_event_io.h"
#include "ttx/key_event_io.h"
#include "ttx/mouse_event_io.h"
#include "ttx/params.h"
#include "ttx/paste_event_io.h"
#include "ttx/size.h"
#include "ttx/terminal/escapes/mode.h"
#include "ttx/terminal/escapes/osc_52.h"
#include "ttx/terminal/escapes/osc_7.h"
#include "ttx/terminal/escapes/osc_8671.h"
#include "ttx/terminal/screen.h"
 
namespace ttx {
class Terminal;
 
struct SetClipboard {
    di::Vector<byte> data;
};
 
struct WritePtyString {
    di::String string;
};
 
using TerminalEvent = di::Variant<APC, terminal::OSC7, terminal::OSC52, terminal::OSC8671, Size, WritePtyString>;
 
struct ModeHandler {
    u32 mode { 0 };
    bool is_private { true };
    terminal::ModeSupport (*query_mode)(Terminal&);
    void (*set_mode)(Terminal&, bool);
};
 
template<auto>
auto make_mode_handler() -> ModeHandler;
 
class Terminal {
    struct ScreenState {
        explicit ScreenState(Size const& size, terminal::Screen::ScrollBackEnabled scroll_back_enabled)
            : screen(size, scroll_back_enabled) {}
 
        terminal::Screen screen;
        di::Optional<terminal::SavedCursor> saved_cursor;
        CursorStyle cursor_style { CursorStyle::SteadyBar };
 
        // Per https://sw.kovidgoyal.net/kitty/keyboard-protocol/#detection-of-support-for-this-protocol,
        // the keyboard mode stack and flags are per-screen.
        KeyReportingFlags m_key_reporting_flags { KeyReportingFlags::None };
        di::Ring<KeyReportingFlags> m_key_reporting_flags_stack;
 
        // Seamless navigation protocl registration state is per-screen.
        bool m_seamless_navigate_protocol_active { false };
        bool m_seamless_navigate_protocol_hide_cursor_on_enter { false };
    };
 
public:
    explicit Terminal(u64 id, Size const& size);
 
    // Return a string which when replayed will result in the terminal
    // having state identical to the current state.
    auto state_as_escape_sequences() const -> di::String;
 
    void on_parser_results(di::Span<ParserResult> results);
 
    auto active_screen() const -> ScreenState const&;
    auto active_screen() -> ScreenState& {
        return const_cast<ScreenState&>(const_cast<Terminal const&>(*this).active_screen());
    }
 
    auto cursor_row() const -> u32 { return active_screen().screen.cursor().row; }
    auto cursor_col() const -> u32 { return active_screen().screen.cursor().col; }
    auto cursor_hidden() const -> bool { return m_cursor_hidden; }
    auto cursor_style() const -> CursorStyle { return active_screen().cursor_style; }
    auto reverse_video() const -> bool { return m_reverse_video; }
 
    auto allowed_to_draw() const -> bool { return !m_disable_drawing; }
 
    // TODO: scroll back
    auto total_rows() const -> u32 { return row_count(); }
    auto visual_scroll_offset() const -> u64 { return active_screen().screen.visual_scroll_offset(); }
 
    auto row_count() const -> u32 { return active_screen().screen.max_height(); }
    auto col_count() const -> u32 { return active_screen().screen.max_width(); }
    auto size() const -> Size { return active_screen().screen.size(); }
 
    void set_visible_size(Size const& size);
    auto visible_size() const -> Size { return m_available_size; }
 
    auto application_cursor_keys_mode() const -> ApplicationCursorKeysMode { return m_application_cursor_keys_mode; }
    auto key_reporting_flags() const -> KeyReportingFlags { return active_screen().m_key_reporting_flags; }
 
    auto alternate_scroll_mode() const -> AlternateScrollMode { return m_alternate_scroll_mode; }
    auto mouse_protocol() const -> MouseProtocol { return m_mouse_protocol; }
    auto mouse_encoding() const -> MouseEncoding { return m_mouse_encoding; }
    auto in_alternate_screen_buffer() const -> bool { return !!m_alternate_screen; }
    auto focus_event_mode() const -> FocusEventMode { return m_focus_event_mode; }
    auto shift_escape_options() const -> ShiftEscapeOptions { return m_shift_escape_options; }
 
    void reset_mouse_reporting() { m_mouse_protocol = MouseProtocol::None; }
 
    auto bracked_paste_mode() const -> BracketedPasteMode { return m_bracketed_paste_mode; }
 
    void soft_reset();
 
    void invalidate_all();
 
    auto outgoing_events() -> di::Vector<TerminalEvent> { return di::move(m_outgoing_events); }
 
    void set_allow_force_terminal_size(bool b = true) { m_allow_force_terminal_size = b; }
 
    void hide_cursor() { m_cursor_hidden = true; }
 
    auto seamless_navigation_protocol_active() const -> bool {
        return active_screen().m_seamless_navigate_protocol_active;
    }
 
    auto seamless_navigate_protocol_hide_cursor_on_enter() const -> bool {
        return active_screen().m_seamless_navigate_protocol_active &&
               active_screen().m_seamless_navigate_protocol_hide_cursor_on_enter;
    }
 
private:
    template<auto>
    friend auto make_mode_handler() -> ModeHandler;
 
    void on_parser_result(PrintableCharacter&& printable_character);
    void on_parser_result(DCS&& dcs);
    void on_parser_result(OSC&& osc);
    void on_parser_result(APC&& apc);
    void on_parser_result(CSI&& csi);
    void on_parser_result(Escape&& escape);
    void on_parser_result(ControlCharacter&& control);
 
    void resize(Size const& size);
 
    void put_char(c32 c);
 
    // TODO: vertical and horizontal scrolling regions.
    auto min_row_inclusive() const -> u32 { return 0; }
    auto min_col_inclusive() const -> u32 { return 0; }
 
    auto max_row_inclusive() const -> u32 { return row_count() - 1; }
    auto max_col_inclusive() const -> u32 { return col_count() - 1; }
 
    void clear();
 
    void set_use_alternate_screen_buffer(bool b);
 
    void esc_decaln();
    void esc_decsc();
    void esc_decrc();
 
    void c0_bs();
    void c0_ht();
    void c0_lf();
    void c0_vt();
    void c0_ff();
    void c0_cr();
 
    void c1_ind();
    void c1_nel();
    void c1_hts();
    void c1_ri();
 
    void dcs_decrqss(Params const& params, di::StringView data);
    void dcs_xtgettcap(Params const& params, di::StringView data);
 
    void osc_7(di::StringView data);
    void osc_8(di::StringView data);
    void osc_52(di::StringView data);
    void osc_66(di::StringView data);
    void osc_133(di::StringView data);
    void osc_8671(di::StringView data);
 
    void csi_ich(Params const& params);
    void csi_cuu(Params const& params);
    void csi_cud(Params const& params);
    void csi_cuf(Params const& params);
    void csi_cub(Params const& params);
    void csi_cpl(Params const& params);
    void csi_cnl(Params const& params);
    void csi_cup(Params const& params);
    void csi_cha(Params const& params);
    void csi_ed(Params const& params);
    void csi_el(Params const& params);
    void csi_il(Params const& params);
    void csi_dl(Params const& params);
    void csi_dch(Params const& params);
    void csi_su(Params const& params);
    void csi_sd(Params const& params);
    void csi_ech(Params const& params);
    void csi_rep(Params const& params);
    void csi_da1(Params const& params);
    void csi_da2(Params const& params);
    void csi_da3(Params const& params);
    void csi_vpa(Params const& params);
    void csi_hvp(Params const& params);
    void csi_tbc(Params const& params);
    void csi_decset(Params const& params);
    void csi_decrst(Params const& params);
    void csi_decrqm(Params const& params);
    void csi_decscusr(Params const& params);
    void csi_sgr(Params const& params);
    void csi_dsr(Params const& params);
    void csi_decstbm(Params const& params);
    void csi_scosc(Params const& params);
    void csi_scorc(Params const& params);
    void csi_decstr(Params const& params);
    void csi_xshiftescape(Params const& params);
    void csi_xtwinops(Params const& params);
 
    void csi_set_key_reporting_flags(Params const& params);
    void csi_get_key_reporting_flags(Params const& params);
    void csi_push_key_reporting_flags(Params const& params);
    void csi_pop_key_reporting_flags(Params const& params);
 
    // Hyperlink state
    u64 m_id { 0 }; // Base id
    u64 m_next_hyperlink_id { 1 };
 
    ScreenState m_primary_screen;
    di::Box<ScreenState> m_alternate_screen;
 
    Size m_available_size;
    bool m_80_col_mode { false };
    bool m_132_col_mode { false };
    bool m_allow_80_132_col_mode { false };
    bool m_force_terminal_size { false };
    bool m_allow_force_terminal_size { false };
 
    di::Vector<u32> m_tab_stops;
    bool m_cursor_hidden { false };
    bool m_disable_drawing { false };
    terminal::AutoWrapMode m_auto_wrap_mode { terminal::AutoWrapMode::Enabled };
    bool m_reverse_video { false };
    di::Optional<c32> m_last_graphics_charcter { 0 };
 
    ApplicationCursorKeysMode m_application_cursor_keys_mode { ApplicationCursorKeysMode::Disabled };
 
    AlternateScrollMode m_alternate_scroll_mode { AlternateScrollMode::Enabled };
    MouseProtocol m_mouse_protocol { MouseProtocol::None };
    MouseEncoding m_mouse_encoding { MouseEncoding::X10 };
    FocusEventMode m_focus_event_mode { FocusEventMode::Disabled };
    ShiftEscapeOptions m_shift_escape_options { ShiftEscapeOptions::OverrideApplication };
 
    BracketedPasteMode m_bracketed_paste_mode { false };
    di::Optional<terminal::OSC7> m_cwd;
    bool m_in_band_size_reports { false };
 
    di::Vector<TerminalEvent> m_outgoing_events;
};
}