foot/terminal.h

#pragma once

#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>

#include <threads.h>
#include <semaphore.h>

#if defined(FOOT_GRAPHEME_CLUSTERING)
 #include <utf8proc.h>
#endif

#include <tllist.h>
#include <fcft/fcft.h>

#include "composed.h"
#include "config.h"
#include "debug.h"
#include "fdm.h"
#include "key-binding.h"
#include "macros.h"
#include "notify.h"
#include "reaper.h"
#include "shm.h"
#include "wayland.h"

enum color_source {
    COLOR_DEFAULT,
    COLOR_BASE16,
    COLOR_BASE256,
    COLOR_RGB,
};

/*
 *  Note: we want the cells to be as small as possible. Larger cells
 *  means fewer scrollback lines (or performance drops due to cache
 *  misses)
 *
 * Note that the members are laid out optimized for x86
 */
struct attributes {
    bool bold:1;
    bool dim:1;
    bool italic:1;
    bool underline:1;
    bool strikethrough:1;
    bool blink:1;
    bool conceal:1;
    bool reverse:1;
    uint32_t fg:24;

    bool clean:1;
    enum color_source fg_src:2;
    enum color_source bg_src:2;
    bool confined:1;
    bool selected:1;
    bool url:1;
    uint32_t bg:24;
};
static_assert(sizeof(struct attributes) == 8, "VT attribute struct too large");

/* Last valid Unicode code point is 0x0010FFFFul */
#define CELL_COMB_CHARS_LO          0x00200000ul
#define CELL_COMB_CHARS_HI          (CELL_COMB_CHARS_LO + 0x3fffffff)
#define CELL_SPACER                 (CELL_COMB_CHARS_HI + 1)

struct cell {
    char32_t wc;
    struct attributes attrs;
};
static_assert(sizeof(struct cell) == 12, "bad size");

struct scroll_region {
    int start;
    int end;
};

struct coord {
    int col;
    int row;
};

struct range {
    struct coord start;
    struct coord end;
};

struct cursor {
    struct coord point;
    bool lcf;
};

enum damage_type {DAMAGE_SCROLL, DAMAGE_SCROLL_REVERSE,
                  DAMAGE_SCROLL_IN_VIEW, DAMAGE_SCROLL_REVERSE_IN_VIEW};

struct damage {
    enum damage_type type;
    struct scroll_region region;
    uint16_t lines;
};

struct uri_range_data {
    uint64_t id;
    char *uri;
};

enum underline_style {
    UNDERLINE_NONE,
    UNDERLINE_SINGLE,  /* Legacy underline */
    UNDERLINE_DOUBLE,
    UNDERLINE_CURLY,
    UNDERLINE_DOTTED,
    UNDERLINE_DASHED,
};

struct underline_range_data {
    enum underline_style style;
    enum color_source color_src;
    uint32_t color;
};

union row_range_data {
    struct uri_range_data uri;
    struct underline_range_data underline;
};

struct row_range {
    int start;
    int end;

    union {
        /* This is just an expanded union row_range_data, but
         * anonymous, so that we don't have to write range->u.uri.id,
         * but can instead do range->uri.id */
        union {
            struct uri_range_data uri;
            struct underline_range_data underline;
        };
        union row_range_data data;
    };
};

struct row_ranges {
    struct row_range *v;
    int size;
    int count;
};

enum row_range_type {ROW_RANGE_URI, ROW_RANGE_UNDERLINE};

struct row_data {
    struct row_ranges uri_ranges;
    struct row_ranges underline_ranges;
};

struct row {
    struct cell *cells;
    struct row_data *extra;

    bool dirty;
    bool linebreak;

    struct {
        bool prompt_marker;
        int cmd_start;  /* Column, -1 if unset */
        int cmd_end;    /* Column, -1 if unset */
    } shell_integration;
};

struct sixel {
    /*
     * These three members reflect the "current", maybe scaled version
     * of the image.
     *
     * The values will either be NULL/-1/-1, or match either the
     * values in "original", or "scaled".
     *
     * They are typically reset when we need to invalidate the cached
     * version (e.g. when the cell dimensions change).
     */
    pixman_image_t *pix;
    int width;
    int height;

    int rows;
    int cols;
    struct coord pos;
    bool opaque;

    /*
     * We store the cell dimensions of the time the sixel was emitted.
     *
     * If the font size is changed, we rescale the image accordingly,
     * to ensure it stays within its cell boundaries. 'scaled' is a
     * cached, rescaled version of 'data' + 'pix'.
     */
    int cell_width;
    int cell_height;

    struct {
        void *data;
        pixman_image_t *pix;
        int width;
        int height;
    } original;

    struct {
        void *data;
        pixman_image_t *pix;
        int width;
        int height;
    } scaled;
};

enum kitty_kbd_flags {
    KITTY_KBD_DISAMBIGUATE = 0x01,
    KITTY_KBD_REPORT_EVENT = 0x02,
    KITTY_KBD_REPORT_ALTERNATE = 0x04,
    KITTY_KBD_REPORT_ALL = 0x08,
    KITTY_KBD_REPORT_ASSOCIATED = 0x10,
    KITTY_KBD_SUPPORTED = (KITTY_KBD_DISAMBIGUATE |
                           KITTY_KBD_REPORT_EVENT |
                           KITTY_KBD_REPORT_ALTERNATE |
                           KITTY_KBD_REPORT_ALL |
                           KITTY_KBD_REPORT_ASSOCIATED),
};

struct grid {
    int num_rows;
    int num_cols;
    int offset;
    int view;

    /*
     * Note: the cursor (not the *saved* cursor) could most likely be
     * global state in the term struct.
     *
     * However, we have grid specific functions that does not have
     * access to the owning term struct, but does need access to the
     * cursor.
     */
    struct cursor cursor;
    struct cursor saved_cursor;

    struct row **rows;
    struct row *cur_row;

    tll(struct damage) scroll_damage;
    tll(struct sixel) sixel_images;

    struct {
        enum kitty_kbd_flags flags[8];
        uint8_t idx;
    } kitty_kbd;

};

struct vt_subparams {
    uint8_t idx;
    unsigned *cur;
    unsigned value[16];
    unsigned dummy;
};

struct vt_param {
    unsigned value;
    struct vt_subparams sub;
};

struct vt {
    int state;  /* enum state */
    char32_t last_printed;
#if defined(FOOT_GRAPHEME_CLUSTERING)
    utf8proc_int32_t grapheme_state;
#endif
    char32_t utf8;
    struct {
        uint8_t idx;
        struct vt_param *cur;
        struct vt_param v[16];
        struct vt_param dummy;
    } params;

    uint32_t private; /* LSB=priv0, MSB=priv3 */

    struct attributes attrs;
    struct attributes saved_attrs;

    struct {
        uint8_t *data;
        size_t size;
        size_t idx;
        bool bel; /* true if OSC string was terminated by BEL */
    } osc;

    /* Start coordinate for current OSC-8 URI */
    struct {
        uint64_t id;
        char *uri;
    } osc8;

    struct underline_range_data underline;

    struct {
        uint8_t *data;
        size_t size;
        size_t idx;
        void (*put_handler)(struct terminal *term, uint8_t c);
        void (*unhook_handler)(struct terminal *term);
    } dcs;
};

enum cursor_origin { ORIGIN_ABSOLUTE, ORIGIN_RELATIVE };
enum cursor_keys { CURSOR_KEYS_DONTCARE, CURSOR_KEYS_NORMAL, CURSOR_KEYS_APPLICATION };
enum keypad_keys { KEYPAD_DONTCARE, KEYPAD_NUMERICAL, KEYPAD_APPLICATION };
enum charset { CHARSET_ASCII, CHARSET_GRAPHIC };
enum charset_designator { G0, G1, G2, G3 };

struct charsets {
    enum charset_designator selected;
    enum charset_designator saved;
    enum charset set[4]; /* G0-G3 */
};

/* *What* to report */
enum mouse_tracking {
    MOUSE_NONE,
    MOUSE_X10,           /* ?9h */
    MOUSE_CLICK,         /* ?1000h - report mouse clicks */
    MOUSE_DRAG,          /* ?1002h - report clicks and drag motions */
    MOUSE_MOTION,        /* ?1003h - report clicks and motion */
};

/* *How* to report */
enum mouse_reporting {
    MOUSE_NORMAL,
    MOUSE_UTF8,          /* ?1005h */
    MOUSE_SGR,           /* ?1006h */
    MOUSE_URXVT,         /* ?1015h */
    MOUSE_SGR_PIXELS,    /* ?1016h */
};

enum selection_kind {
    SELECTION_NONE,
    SELECTION_CHAR_WISE,
    SELECTION_WORD_WISE,
    SELECTION_QUOTE_WISE,
    SELECTION_LINE_WISE,
    SELECTION_BLOCK
};
enum selection_direction {SELECTION_UNDIR, SELECTION_LEFT, SELECTION_RIGHT};
enum selection_scroll_direction {SELECTION_SCROLL_NOT, SELECTION_SCROLL_UP, SELECTION_SCROLL_DOWN};
enum search_direction { SEARCH_BACKWARD_SAME_POSITION, SEARCH_BACKWARD, SEARCH_FORWARD };

struct ptmx_buffer {
    void *data;
    size_t len;
    size_t idx;
};

enum term_surface {
    TERM_SURF_NONE,
    TERM_SURF_GRID,
    TERM_SURF_TITLE,
    TERM_SURF_BORDER_LEFT,
    TERM_SURF_BORDER_RIGHT,
    TERM_SURF_BORDER_TOP,
    TERM_SURF_BORDER_BOTTOM,
    TERM_SURF_BUTTON_MINIMIZE,
    TERM_SURF_BUTTON_MAXIMIZE,
    TERM_SURF_BUTTON_CLOSE,
};

enum overlay_style {
    OVERLAY_NONE,
    OVERLAY_SEARCH,
    OVERLAY_FLASH,
    OVERLAY_UNICODE_MODE,
};

typedef tll(struct ptmx_buffer) ptmx_buffer_list_t;

enum url_action { URL_ACTION_COPY, URL_ACTION_LAUNCH, URL_ACTION_PERSISTENT };
struct url {
    uint64_t id;
    char *url;
    char32_t *key;
    struct range range;
    enum url_action action;
    bool url_mode_dont_change_url_attr; /* Entering/exiting URL mode doesn't touch the cells' attr.url */
    bool osc8;
    bool duplicate;
};
typedef tll(struct url) url_list_t;


struct colors {
    uint32_t fg;
    uint32_t bg;
    uint32_t table[256];
    uint16_t alpha;
    uint32_t cursor_fg;  /* Text color */
    uint32_t cursor_bg;  /* cursor color */
    uint32_t selection_fg;
    uint32_t selection_bg;
    bool use_custom_selection;
};

struct terminal {
    struct fdm *fdm;
    struct reaper *reaper;
    const struct config *conf;

    void (*ascii_printer)(struct terminal *term, char32_t c);
    union {
        struct {
            bool sixels:1;
            bool osc8:1;
            bool underline_style:1;
            bool underline_color:1;
            bool insert_mode:1;
            bool charset:1;
        };
        uint8_t value;
    } bits_affecting_ascii_printer;

    pid_t slave;
    int ptmx;

    struct vt vt;
    struct grid *grid;
    struct grid normal;
    struct grid alt;

    int cols;   /* number of columns */
    int rows;   /* number of rows */
    struct scroll_region scroll_region;

    struct charsets charsets;
    struct charsets saved_charsets; /* For save/restore cursor + attributes */

    bool auto_margin;
    bool insert_mode;
    bool reverse;
    bool hide_cursor;
    bool reverse_wrap;
    bool bracketed_paste;
    bool focus_events;
    bool alt_scrolling;
    bool modify_other_keys_2;  /* True when modifyOtherKeys=2 (i.e. "CSI >4;2m") */
    enum cursor_origin origin;
    enum cursor_keys cursor_keys_mode;
    enum keypad_keys keypad_keys_mode;
    enum mouse_tracking mouse_tracking;
    enum mouse_reporting mouse_reporting;
    char *mouse_user_cursor;  /* For OSC-22 */

    tll(int) tab_stops;

    size_t composed_count;
    struct composed *composed;

    /* Temporary: for FDM */
    struct {
        bool is_armed;
        int lower_fd;
        int upper_fd;
    } delayed_render_timer;

    struct fcft_font *fonts[4];
    struct config_font *font_sizes[4];
    struct pt_or_px font_line_height;
    float font_dpi;
    float font_dpi_before_unmap;
    bool font_is_sized_by_dpi;
    int16_t font_x_ofs;
    int16_t font_y_ofs;
    int16_t font_baseline;
    enum fcft_subpixel font_subpixel;

    struct {
        struct fcft_glyph **box_drawing;
        struct fcft_glyph **braille;
        struct fcft_glyph **legacy;
        struct fcft_glyph **octants;

        #define GLYPH_BOX_DRAWING_FIRST 0x2500
        #define GLYPH_BOX_DRAWING_LAST  0x259F
        #define GLYPH_BOX_DRAWING_COUNT \
            (GLYPH_BOX_DRAWING_LAST - GLYPH_BOX_DRAWING_FIRST + 1)

        #define GLYPH_BRAILLE_FIRST 0x2800
        #define GLYPH_BRAILLE_LAST  0x28FF
        #define GLYPH_BRAILLE_COUNT \
            (GLYPH_BRAILLE_LAST - GLYPH_BRAILLE_FIRST + 1)

        #define GLYPH_LEGACY_FIRST 0x1FB00
        #define GLYPH_LEGACY_LAST  0x1FB9B
        #define GLYPH_LEGACY_COUNT \
            (GLYPH_LEGACY_LAST - GLYPH_LEGACY_FIRST + 1)

        #define GLYPH_OCTANTS_FIRST 0x1CD00
        #define GLYPH_OCTANTS_LAST  0x1CDE5
        #define GLYPH_OCTANTS_COUNT \
            (GLYPH_OCTANTS_LAST - GLYPH_OCTANTS_FIRST + 1)
    } custom_glyphs;

    bool is_sending_paste_data;
    ptmx_buffer_list_t ptmx_buffers;
    ptmx_buffer_list_t ptmx_paste_buffers;

    struct {
        bool esc_prefix;
        bool eight_bit;
    } meta;

    bool num_lock_modifier;
    bool bell_action_enabled;

    /* Saved DECSET modes - we save the SET state */
    struct {
        bool origin:1;
        bool application_cursor_keys:1;
        bool application_keypad_keys:1;
        bool reverse:1;
        bool show_cursor:1;
        bool reverse_wrap:1;
        bool auto_margin:1;
        bool cursor_blink:1;
        bool bracketed_paste:1;
        bool focus_events:1;
        bool alt_scrolling:1;
        //bool mouse_x10:1;
        bool mouse_click:1;
        bool mouse_drag:1;
        bool mouse_motion:1;
        //bool mouse_utf8:1;
        bool mouse_sgr:1;
        bool mouse_urxvt:1;
        bool mouse_sgr_pixels:1;
        bool meta_eight_bit:1;
        bool meta_esc_prefix:1;
        bool num_lock_modifier:1;
        bool bell_action_enabled:1;
        bool alt_screen:1;
        bool ime:1;
        bool app_sync_updates:1;
        bool grapheme_shaping:1;

        bool size_notifications:1;

        bool sixel_display_mode:1;
        bool sixel_private_palette:1;
        bool sixel_cursor_right_of_graphics:1;
    } xtsave;

    bool window_title_has_been_set;
    char *window_title;
    tll(char *) window_title_stack;
    //char *window_icon;  /* No escape sequence available to set the icon */
    //tll(char *)window_icon_stack;
    char *app_id;

    struct {
        bool active;
        int fd;
    } flash;

    struct {
        enum { BLINK_ON, BLINK_OFF } state;
        int fd;
    } blink;

    float scale;
    float scale_before_unmap;  /* Last scaling factor used */
    int width;  /* pixels */
    int height; /* pixels */
    int stashed_width;
    int stashed_height;
    struct {
        int left;
        int right;
        int top;
        int bottom;
    } margins;
    int cell_width;  /* pixels per cell, x-wise */
    int cell_height; /* pixels per cell, y-wise */

    struct colors colors;

    struct {
        struct colors *stack;
        size_t idx;
        size_t size;
    } color_stack;

    enum cursor_style cursor_style;
    struct {
        bool decset;   /* Blink enabled via '\E[?12h' */
        bool deccsusr; /* Blink enabled via '\E[X q' */
        int fd;
        enum { CURSOR_BLINK_ON, CURSOR_BLINK_OFF } state;
    } cursor_blink;

    struct {
        enum selection_kind kind;
        enum selection_direction direction;
        struct range coords;
        bool ongoing;
        bool spaces_only; /* SELECTION_SEMANTIC_WORD */

        struct range pivot;

        struct {
            int fd;
            int col;
            enum selection_scroll_direction direction;
        } auto_scroll;
    } selection;

    bool is_searching;
    struct {
        char32_t *buf;
        size_t len;
        size_t sz;
        size_t cursor;

        int original_view;
        bool view_followed_offset;
        struct coord match;
        size_t match_len;

        struct {
            char32_t *buf;
            size_t len;
        } last;
    } search;

    struct wayland *wl;
    struct wl_window *window;
    bool visual_focus;
    bool kbd_focus;
    enum term_surface active_surface;

    struct {
        struct {
            struct buffer_chain *grid;
            struct buffer_chain *search;
            struct buffer_chain *scrollback_indicator;
            struct buffer_chain *render_timer;
            struct buffer_chain *url;
            struct buffer_chain *csd;
            struct buffer_chain *overlay;
        } chains;

        /* Scheduled for rendering, as soon-as-possible */
        struct {
            bool grid;
            bool csd;
            bool search;
            bool urls;
        } refresh;

        /* Scheduled for rendering, in the next frame callback */
        struct {
            bool grid;
            bool csd;
            bool search;
            bool urls;
        } pending;

        bool margins;  /* Someone explicitly requested a refresh of the margins */
        bool urgency;  /* Signal 'urgency' (paint borders red) */

        struct {
            struct timespec last_update;
            int timer_fd;
        } title;

        struct {
            struct timespec last_update;
            int timer_fd;
        } icon;

        struct {
            struct timespec last_update;
            int timer_fd;
        } app_id;

        uint32_t scrollback_lines; /* Number of scrollback lines, from conf (TODO: move out from render struct?) */

        struct {
            bool enabled;
            int timer_fd;
        } app_sync_updates;

        /* Render threads + synchronization primitives */
        struct {
            uint16_t count;
            sem_t start;
            sem_t done;
            mtx_t lock;
            tll(int) queue;
            thrd_t *threads;
            struct buffer *buf;
        } workers;

        /* Last rendered cursor position */
        struct {
            struct row *row;
            int col;
            bool hidden;
        } last_cursor;

        struct buffer *last_buf;     /* Buffer we rendered to last time */

        enum overlay_style last_overlay_style;
        struct buffer *last_overlay_buf;
        pixman_region32_t last_overlay_clip;

        size_t search_glyph_offset;

        struct timespec input_time;
    } render;

    struct {
        struct grid *grid;    /* Original 'normal' grid, before resize started */
        int old_screen_rows;  /* term->rows before resize started */
        int old_cols;         /* term->cols before resize started */
        int old_hide_cursor;  /* term->hide_cursor before resize started */
        int new_rows;         /* New number of scrollback rows */
        struct range selection_coords;
    } interactive_resizing;

    struct {
        enum {
            SIXEL_DECSIXEL,  /* DECSIXEL body part ", $, -, ? ... ~ */
            SIXEL_DECGRA,    /* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
            SIXEL_DECGRI,    /* DECGRI Graphics Repeat Introducer ! Pn Ch */
            SIXEL_DECGCI,    /* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
        } state;

        struct coord pos;    /* Current sixel coordinate */
        int color_idx;       /* Current palette index */
        uint32_t *private_palette;   /* Private palette, used when private mode 1070 is enabled */
        uint32_t *shared_palette;    /* Shared palette, used when private mode 1070 is disabled */
        uint32_t *palette;   /* Points to either private_palette or shared_palette */
        uint32_t color;

        struct {
            uint32_t *data;  /* Raw image data, in ARGB */
            uint32_t *p;     /* Pointer into data, for current position */
            int width;       /* Image width, in pixels */
            int height;      /* Image height, in pixels */
            int alloc_height;
            unsigned int bottom_pixel;
        } image;

        /*
         * Pan is the vertical shape of a pixel
         * Pad is the horizontal shape of a pixel
         *
         * pan/pad is the sixel's aspect ratio
         */
        int pan;
        int pad;

        bool scrolling:1;                 /* Private mode 80 */
        bool use_private_palette:1;       /* Private mode 1070 */
        bool cursor_right_of_graphics:1;  /* Private mode 8452 */

        unsigned params[5];  /* Collected parameters, for RASTER, COLOR_SPEC */
        unsigned param;      /* Currently collecting parameter, for RASTER, COLOR_SPEC and REPEAT */
        unsigned param_idx;  /* Parameters seen */
        unsigned repeat_count;

        bool transparent_bg;

        /* Application configurable */
        unsigned palette_size;  /* Number of colors in palette */
        unsigned max_width;     /* Maximum image width, in pixels */
        unsigned max_height;    /* Maximum image height, in pixels */
    } sixel;

    /* TODO: wrap in a struct */
    url_list_t urls;
    char32_t url_keys[5];
    bool urls_show_uri_on_jump_label;
    struct grid *url_grid_snapshot;
    bool ime_reenable_after_url_mode;

#if defined(FOOT_IME_ENABLED) && FOOT_IME_ENABLED
    bool ime_enabled;
#endif

    struct {
        bool active;
        int count;
        char32_t character;
    } unicode_mode;

    struct {
        bool in_progress;
        bool client_has_terminated;
        int terminate_timeout_fd;
        int exit_status;
        int next_signal;

        void (*cb)(void *data, int exit_code);
        void *cb_data;
    } shutdown;

    /* State, to handle chunked notifications */
    struct notification kitty_notification;

    /* Currently active notifications, from foot's perspective (their
       notification helper processes are still running) */
    tll(struct notification) active_notifications;
    struct notification_icon notification_icons[32];

    char *foot_exe;
    char *cwd;

    bool grapheme_shaping;
    bool size_notifications;
};

struct config;
struct terminal *term_init(
    const struct config *conf, struct fdm *fdm, struct reaper *reaper,
    struct wayland *wayl, const char *foot_exe, const char *cwd,
    const char *token, const char *pty_path,
    int argc, char *const *argv, const char *const *envp,
    void (*shutdown_cb)(void *data, int exit_code), void *shutdown_data);

bool term_shutdown(struct terminal *term);
int term_destroy(struct terminal *term);

void term_update_ascii_printer(struct terminal *term);
void term_single_shift(struct terminal *term, enum charset_designator idx);

void term_reset(struct terminal *term, bool hard);
bool term_to_slave(struct terminal *term, const void *data, size_t len);
bool term_paste_data_to_slave(
    struct terminal *term, const void *data, size_t len);

bool term_fractional_scaling(const struct terminal *term);
bool term_preferred_buffer_scale(const struct terminal *term);
bool term_update_scale(struct terminal *term);
bool term_font_size_increase(struct terminal *term);
bool term_font_size_decrease(struct terminal *term);
bool term_font_size_reset(struct terminal *term);
bool term_font_dpi_changed(struct terminal *term, float old_scale);
void term_font_subpixel_changed(struct terminal *term);
int term_font_baseline(const struct terminal *term);

int term_pt_or_px_as_pixels(
    const struct terminal *term, const struct pt_or_px *pt_or_px);


void term_window_configured(struct terminal *term);

void term_damage_rows(struct terminal *term, int start, int end);
void term_damage_rows_in_view(struct terminal *term, int start, int end);

void term_damage_all(struct terminal *term);
void term_damage_view(struct terminal *term);

void term_damage_cursor(struct terminal *term);
void term_damage_margins(struct terminal *term);
void term_damage_color(struct terminal *term, enum color_source src, int idx);

void term_reset_view(struct terminal *term);

void term_damage_scroll(
    struct terminal *term, enum damage_type damage_type,
    struct scroll_region region, int lines);

void term_erase(
    struct terminal *term,
    int start_row, int start_col,
    int end_row, int end_col);
void term_erase_scrollback(struct terminal *term);

int term_row_rel_to_abs(const struct terminal *term, int row);
void term_cursor_home(struct terminal *term);
void term_cursor_to(struct terminal *term, int row, int col);
void term_cursor_col(struct terminal *term, int col);
void term_cursor_left(struct terminal *term, int count);
void term_cursor_right(struct terminal *term, int count);
void term_cursor_up(struct terminal *term, int count);
void term_cursor_down(struct terminal *term, int count);
void term_cursor_blink_update(struct terminal *term);

void term_print(struct terminal *term, char32_t wc, int width);
void term_fill(struct terminal *term, int row, int col, uint8_t c, size_t count,
               bool use_sgr_attrs);

void term_scroll(struct terminal *term, int rows);
void term_scroll_reverse(struct terminal *term, int rows);

void term_scroll_partial(
    struct terminal *term, struct scroll_region region, int rows);
void term_scroll_reverse_partial(
    struct terminal *term, struct scroll_region region, int rows);

void term_carriage_return(struct terminal *term);
void term_linefeed(struct terminal *term);
void term_reverse_index(struct terminal *term);

void term_arm_blink_timer(struct terminal *term);

void term_save_cursor(struct terminal *term);
void term_restore_cursor(struct terminal *term, const struct cursor *cursor);

void term_visual_focus_in(struct terminal *term);
void term_visual_focus_out(struct terminal *term);
void term_kbd_focus_in(struct terminal *term);
void term_kbd_focus_out(struct terminal *term);
void term_mouse_down(
    struct terminal *term, int button, int row, int col,
    int row_pixels, int col_pixels,
    bool shift, bool alt, bool ctrl);
void term_mouse_up(
    struct terminal *term, int button, int row, int col,
    int row_pixels, int col_pixels,
    bool shift, bool alt, bool ctrl);
void term_mouse_motion(
    struct terminal *term, int button, int row, int col,
    int row_pixels, int col_pixels,
    bool shift, bool alt, bool ctrl);
bool term_mouse_grabbed(const struct terminal *term, const struct seat *seat);
void term_xcursor_update(struct terminal *term);
void term_xcursor_update_for_seat(struct terminal *term, struct seat *seat);
void term_set_user_mouse_cursor(struct terminal *term, const char *cursor);

void term_set_window_title(struct terminal *term, const char *title);
void term_set_app_id(struct terminal *term, const char *app_id);
const char *term_icon(const struct terminal *term);
void term_flash(struct terminal *term, unsigned duration_ms);
void term_bell(struct terminal *term);
bool term_spawn_new(const struct terminal *term);

void term_enable_app_sync_updates(struct terminal *term);
void term_disable_app_sync_updates(struct terminal *term);

enum term_surface term_surface_kind(
    const struct terminal *term, const struct wl_surface *surface);

bool term_scrollback_to_text(
    const struct terminal *term, char **text, size_t *len);
bool term_view_to_text(
    const struct terminal *term, char **text, size_t *len);
bool term_command_output_to_text(
    const struct terminal *term, char **text, size_t *len);

bool term_ime_is_enabled(const struct terminal *term);
void term_ime_enable(struct terminal *term);
void term_ime_disable(struct terminal *term);
bool term_ime_reset(struct terminal *term);
void term_ime_set_cursor_rect(
    struct terminal *term, int x, int y, int width, int height);

void term_urls_reset(struct terminal *term);
void term_collect_urls(struct terminal *term);

void term_osc8_open(struct terminal *term, uint64_t id, const char *uri);
void term_osc8_close(struct terminal *term);

bool term_ptmx_pause(struct terminal *term);
bool term_ptmx_resume(struct terminal *term);

void term_enable_size_notifications(struct terminal *term);
void term_disable_size_notifications(struct terminal *term);
void term_send_size_notification(struct terminal *term);

static inline void term_reset_grapheme_state(struct terminal *term)
{
#if defined(FOOT_GRAPHEME_CLUSTERING)
    term->vt.grapheme_state = 0;
#endif
}