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tui.c
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tui.c
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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
// Terminal UI functions. Invoked (by ui_bridge.c) on the TUI thread.
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <unibilium.h>
#include <uv.h>
#if defined(HAVE_TERMIOS_H)
# include <termios.h>
#endif
#include "nvim/api/private/helpers.h"
#include "nvim/api/vim.h"
#include "nvim/ascii.h"
#include "nvim/event/loop.h"
#include "nvim/event/signal.h"
#include "nvim/highlight.h"
#include "nvim/lib/kvec.h"
#include "nvim/log.h"
#include "nvim/main.h"
#include "nvim/map.h"
#include "nvim/memory.h"
#include "nvim/option.h"
#include "nvim/os/input.h"
#include "nvim/os/os.h"
#include "nvim/os/signal.h"
#include "nvim/os/tty.h"
#include "nvim/ui.h"
#include "nvim/vim.h"
#ifdef WIN32
# include "nvim/os/os_win_console.h"
#endif
#include "nvim/cursor_shape.h"
#include "nvim/macros.h"
#include "nvim/strings.h"
#include "nvim/syntax.h"
#include "nvim/tui/input.h"
#include "nvim/tui/terminfo.h"
#include "nvim/tui/tui.h"
#include "nvim/ugrid.h"
#include "nvim/ui_bridge.h"
// Space reserved in two output buffers to make the cursor normal or invisible
// when flushing. No existing terminal will require 32 bytes to do that.
#define CNORM_COMMAND_MAX_SIZE 32
#define OUTBUF_SIZE 0xffff
#define TOO_MANY_EVENTS 1000000
#define STARTS_WITH(str, prefix) \
(strlen(str) >= (sizeof(prefix) - 1) \
&& 0 == memcmp((str), (prefix), sizeof(prefix) - 1))
#define TMUX_WRAP(is_tmux, seq) \
((is_tmux) ? "\x1bPtmux;\x1b" seq "\x1b\\" : seq)
#define LINUXSET0C "\x1b[?0c"
#define LINUXSET1C "\x1b[?1c"
#ifdef NVIM_UNIBI_HAS_VAR_FROM
# define UNIBI_SET_NUM_VAR(var, num) \
do { \
(var) = unibi_var_from_num((num)); \
} while (0)
#else
# define UNIBI_SET_NUM_VAR(var, num) (var).i = (num);
#endif
typedef struct {
int top, bot, left, right;
} Rect;
struct TUIData {
UIBridgeData *bridge;
Loop *loop;
unibi_var_t params[9];
char buf[OUTBUF_SIZE];
size_t bufpos;
char norm[CNORM_COMMAND_MAX_SIZE];
char invis[CNORM_COMMAND_MAX_SIZE];
size_t normlen, invislen;
TermInput input;
uv_loop_t write_loop;
unibi_term *ut;
union {
uv_tty_t tty;
uv_pipe_t pipe;
} output_handle;
bool out_isatty;
SignalWatcher winch_handle, cont_handle;
bool cont_received;
UGrid grid;
kvec_t(Rect) invalid_regions;
int row, col;
int out_fd;
bool scroll_region_is_full_screen;
bool can_change_scroll_region;
bool can_set_lr_margin; // smglr
bool can_set_left_right_margin;
bool can_scroll;
bool can_erase_chars;
bool immediate_wrap_after_last_column;
bool bce;
bool mouse_enabled;
bool busy, is_invisible, want_invisible;
bool cork, overflow;
bool cursor_color_changed;
bool is_starting;
FILE *screenshot;
cursorentry_T cursor_shapes[SHAPE_IDX_COUNT];
HlAttrs clear_attrs;
kvec_t(HlAttrs) attrs;
int print_attr_id;
bool default_attr;
bool can_clear_attr;
ModeShape showing_mode;
struct {
int enable_mouse, disable_mouse;
int enable_bracketed_paste, disable_bracketed_paste;
int enable_lr_margin, disable_lr_margin;
int enter_strikethrough_mode;
int set_rgb_foreground, set_rgb_background;
int set_cursor_color;
int reset_cursor_color;
int enable_focus_reporting, disable_focus_reporting;
int resize_screen;
int reset_scroll_region;
int set_cursor_style, reset_cursor_style;
int save_title, restore_title;
int get_bg;
int set_underline_style;
int set_underline_color;
int enable_extended_keys, disable_extended_keys;
int get_extkeys;
} unibi_ext;
char *space_buf;
};
static bool volatile got_winch = false;
static bool did_user_set_dimensions = false;
static bool cursor_style_enabled = false;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "tui/tui.c.generated.h"
#endif
UI *tui_start(void)
{
UI *ui = xcalloc(1, sizeof(UI)); // Freed by ui_bridge_stop().
ui->stop = tui_stop;
ui->grid_resize = tui_grid_resize;
ui->grid_clear = tui_grid_clear;
ui->grid_cursor_goto = tui_grid_cursor_goto;
ui->mode_info_set = tui_mode_info_set;
ui->update_menu = tui_update_menu;
ui->busy_start = tui_busy_start;
ui->busy_stop = tui_busy_stop;
ui->mouse_on = tui_mouse_on;
ui->mouse_off = tui_mouse_off;
ui->mode_change = tui_mode_change;
ui->grid_scroll = tui_grid_scroll;
ui->hl_attr_define = tui_hl_attr_define;
ui->bell = tui_bell;
ui->visual_bell = tui_visual_bell;
ui->default_colors_set = tui_default_colors_set;
ui->flush = tui_flush;
ui->suspend = tui_suspend;
ui->set_title = tui_set_title;
ui->set_icon = tui_set_icon;
ui->screenshot = tui_screenshot;
ui->option_set = tui_option_set;
ui->raw_line = tui_raw_line;
memset(ui->ui_ext, 0, sizeof(ui->ui_ext));
ui->ui_ext[kUILinegrid] = true;
ui->ui_ext[kUITermColors] = true;
return ui_bridge_attach(ui, tui_main, tui_scheduler);
}
void tui_enable_extkeys(TUIData *data)
{
TermInput input = data->input;
unibi_term *ut = data->ut;
UI *ui = data->bridge->ui;
switch (input.extkeys_type) {
case kExtkeysCSIu:
data->unibi_ext.enable_extended_keys = (int)unibi_add_ext_str(ut, "ext.enable_extended_keys",
"\x1b[>1u");
data->unibi_ext.disable_extended_keys = (int)unibi_add_ext_str(ut, "ext.disable_extended_keys",
"\x1b[<1u");
break;
case kExtkeysXterm:
data->unibi_ext.enable_extended_keys = (int)unibi_add_ext_str(ut, "ext.enable_extended_keys",
"\x1b[>4;2m");
data->unibi_ext.disable_extended_keys = (int)unibi_add_ext_str(ut, "ext.disable_extended_keys",
"\x1b[>4;0m");
break;
default:
break;
}
unibi_out_ext(ui, data->unibi_ext.enable_extended_keys);
}
static size_t unibi_pre_fmt_str(TUIData *data, unsigned int unibi_index, char *buf, size_t len)
{
const char *str = unibi_get_str(data->ut, unibi_index);
if (!str) {
return 0U;
}
return unibi_run(str, data->params, buf, len);
}
static void termname_set_event(void **argv)
{
char *termname = argv[0];
set_tty_option("term", termname);
// Do not free termname, it is freed by set_tty_option.
}
static void terminfo_start(UI *ui)
{
TUIData *data = ui->data;
data->scroll_region_is_full_screen = true;
data->bufpos = 0;
data->default_attr = false;
data->can_clear_attr = false;
data->is_invisible = true;
data->want_invisible = false;
data->busy = false;
data->cork = false;
data->overflow = false;
data->cursor_color_changed = false;
data->showing_mode = SHAPE_IDX_N;
data->unibi_ext.enable_mouse = -1;
data->unibi_ext.disable_mouse = -1;
data->unibi_ext.set_cursor_color = -1;
data->unibi_ext.reset_cursor_color = -1;
data->unibi_ext.enable_bracketed_paste = -1;
data->unibi_ext.disable_bracketed_paste = -1;
data->unibi_ext.enter_strikethrough_mode = -1;
data->unibi_ext.enable_lr_margin = -1;
data->unibi_ext.disable_lr_margin = -1;
data->unibi_ext.enable_focus_reporting = -1;
data->unibi_ext.disable_focus_reporting = -1;
data->unibi_ext.resize_screen = -1;
data->unibi_ext.reset_scroll_region = -1;
data->unibi_ext.set_cursor_style = -1;
data->unibi_ext.reset_cursor_style = -1;
data->unibi_ext.get_bg = -1;
data->unibi_ext.set_underline_color = -1;
data->unibi_ext.enable_extended_keys = -1;
data->unibi_ext.disable_extended_keys = -1;
data->unibi_ext.get_extkeys = -1;
data->out_fd = STDOUT_FILENO;
data->out_isatty = os_isatty(data->out_fd);
data->input.tui_data = data;
const char *term = os_getenv("TERM");
#ifdef WIN32
os_tty_guess_term(&term, data->out_fd);
os_setenv("TERM", term, 1);
// Old os_getenv() pointer is invalid after os_setenv(), fetch it again.
term = os_getenv("TERM");
#endif
// Set up unibilium/terminfo.
char *termname = NULL;
if (term) {
os_env_var_lock();
data->ut = unibi_from_term(term);
os_env_var_unlock();
if (data->ut) {
termname = xstrdup(term);
}
}
if (!data->ut) {
data->ut = terminfo_from_builtin(term, &termname);
}
// Update 'term' option.
loop_schedule_deferred(&main_loop,
event_create(termname_set_event, 1, termname));
// None of the following work over SSH; see :help TERM .
const char *colorterm = os_getenv("COLORTERM");
const char *termprg = os_getenv("TERM_PROGRAM");
const char *vte_version_env = os_getenv("VTE_VERSION");
long vtev = vte_version_env ? strtol(vte_version_env, NULL, 10) : 0;
bool iterm_env = termprg && strstr(termprg, "iTerm.app");
bool nsterm = (termprg && strstr(termprg, "Apple_Terminal"))
|| terminfo_is_term_family(term, "nsterm");
bool konsole = terminfo_is_term_family(term, "konsole")
|| os_getenv("KONSOLE_PROFILE_NAME")
|| os_getenv("KONSOLE_DBUS_SESSION");
const char *konsolev_env = os_getenv("KONSOLE_VERSION");
long konsolev = konsolev_env ? strtol(konsolev_env, NULL, 10)
: (konsole ? 1 : 0);
patch_terminfo_bugs(data, term, colorterm, vtev, konsolev, iterm_env, nsterm);
augment_terminfo(data, term, vtev, konsolev, iterm_env, nsterm);
data->can_change_scroll_region =
!!unibi_get_str(data->ut, unibi_change_scroll_region);
data->can_set_lr_margin =
!!unibi_get_str(data->ut, unibi_set_lr_margin);
data->can_set_left_right_margin =
!!unibi_get_str(data->ut, unibi_set_left_margin_parm)
&& !!unibi_get_str(data->ut, unibi_set_right_margin_parm);
data->can_scroll =
!!unibi_get_str(data->ut, unibi_delete_line)
&& !!unibi_get_str(data->ut, unibi_parm_delete_line)
&& !!unibi_get_str(data->ut, unibi_insert_line)
&& !!unibi_get_str(data->ut, unibi_parm_insert_line);
data->can_erase_chars = !!unibi_get_str(data->ut, unibi_erase_chars);
data->immediate_wrap_after_last_column =
terminfo_is_term_family(term, "conemu")
|| terminfo_is_term_family(term, "cygwin")
|| terminfo_is_term_family(term, "win32con")
|| terminfo_is_term_family(term, "interix");
data->bce = unibi_get_bool(data->ut, unibi_back_color_erase);
data->normlen = unibi_pre_fmt_str(data, unibi_cursor_normal,
data->norm, sizeof data->norm);
data->invislen = unibi_pre_fmt_str(data, unibi_cursor_invisible,
data->invis, sizeof data->invis);
// Set 't_Co' from the result of unibilium & fix_terminfo.
t_colors = unibi_get_num(data->ut, unibi_max_colors);
// Enter alternate screen, save title, and clear.
// NOTE: Do this *before* changing terminal settings. #6433
unibi_out(ui, unibi_enter_ca_mode);
// Save title/icon to the "stack". #4063
unibi_out_ext(ui, data->unibi_ext.save_title);
unibi_out(ui, unibi_keypad_xmit);
unibi_out(ui, unibi_clear_screen);
// Ask the terminal to send us the background color.
data->input.waiting_for_bg_response = 5;
unibi_out_ext(ui, data->unibi_ext.get_bg);
// Enable bracketed paste
unibi_out_ext(ui, data->unibi_ext.enable_bracketed_paste);
// Query the terminal to see if it supports CSI u
data->input.waiting_for_csiu_response = 5;
unibi_out_ext(ui, data->unibi_ext.get_extkeys);
int ret;
uv_loop_init(&data->write_loop);
if (data->out_isatty) {
ret = uv_tty_init(&data->write_loop, &data->output_handle.tty, data->out_fd, 0);
if (ret) {
ELOG("uv_tty_init failed: %s", uv_strerror(ret));
}
#ifdef WIN32
ret = uv_tty_set_mode(&data->output_handle.tty, UV_TTY_MODE_RAW);
if (ret) {
ELOG("uv_tty_set_mode failed: %s", uv_strerror(ret));
}
#else
int retry_count = 10;
// A signal may cause uv_tty_set_mode() to fail (e.g., SIGCONT). Retry a
// few times. #12322
while ((ret = uv_tty_set_mode(&data->output_handle.tty, UV_TTY_MODE_IO)) == UV_EINTR
&& retry_count > 0) {
retry_count--;
}
if (ret) {
ELOG("uv_tty_set_mode failed: %s", uv_strerror(ret));
}
#endif
} else {
ret = uv_pipe_init(&data->write_loop, &data->output_handle.pipe, 0);
if (ret) {
ELOG("uv_pipe_init failed: %s", uv_strerror(ret));
}
ret = uv_pipe_open(&data->output_handle.pipe, data->out_fd);
if (ret) {
ELOG("uv_pipe_open failed: %s", uv_strerror(ret));
}
}
flush_buf(ui);
}
static void terminfo_stop(UI *ui)
{
TUIData *data = ui->data;
// Destroy output stuff
tui_mode_change(ui, (String)STRING_INIT, SHAPE_IDX_N);
tui_mouse_off(ui);
unibi_out(ui, unibi_exit_attribute_mode);
// Reset cursor to normal before exiting alternate screen.
unibi_out(ui, unibi_cursor_normal);
unibi_out(ui, unibi_keypad_local);
// Disable extended keys before exiting alternate screen.
unibi_out_ext(ui, data->unibi_ext.disable_extended_keys);
unibi_out(ui, unibi_exit_ca_mode);
// Restore title/icon from the "stack". #4063
unibi_out_ext(ui, data->unibi_ext.restore_title);
if (data->cursor_color_changed) {
unibi_out_ext(ui, data->unibi_ext.reset_cursor_color);
}
// Disable bracketed paste
unibi_out_ext(ui, data->unibi_ext.disable_bracketed_paste);
// Disable focus reporting
unibi_out_ext(ui, data->unibi_ext.disable_focus_reporting);
flush_buf(ui);
uv_tty_reset_mode();
uv_close((uv_handle_t *)&data->output_handle, NULL);
uv_run(&data->write_loop, UV_RUN_DEFAULT);
if (uv_loop_close(&data->write_loop)) {
abort();
}
unibi_destroy(data->ut);
}
static void tui_terminal_start(UI *ui)
{
TUIData *data = ui->data;
data->print_attr_id = -1;
ugrid_init(&data->grid);
terminfo_start(ui);
tui_guess_size(ui);
signal_watcher_start(&data->winch_handle, sigwinch_cb, SIGWINCH);
tinput_start(&data->input);
}
static void tui_terminal_after_startup(UI *ui)
FUNC_ATTR_NONNULL_ALL
{
TUIData *data = ui->data;
// Emit this after Nvim startup, not during. This works around a tmux
// 2.3 bug(?) which caused slow drawing during startup. #7649
unibi_out_ext(ui, data->unibi_ext.enable_focus_reporting);
flush_buf(ui);
}
static void tui_terminal_stop(UI *ui)
{
TUIData *data = ui->data;
if (uv_is_closing(STRUCT_CAST(uv_handle_t, &data->output_handle))) {
// Race between SIGCONT (tui.c) and SIGHUP (os/signal.c)? #8075
ELOG("TUI already stopped (race?)");
ui->data = NULL; // Flag UI as "stopped".
return;
}
tinput_stop(&data->input);
signal_watcher_stop(&data->winch_handle);
terminfo_stop(ui);
ugrid_free(&data->grid);
}
static void tui_stop(UI *ui)
{
tui_terminal_stop(ui);
ui->data = NULL; // Flag UI as "stopped".
}
/// Returns true if UI `ui` is stopped.
static bool tui_is_stopped(UI *ui)
{
return ui->data == NULL;
}
/// Main function of the TUI thread.
static void tui_main(UIBridgeData *bridge, UI *ui)
{
Loop tui_loop;
loop_init(&tui_loop, NULL);
TUIData *data = xcalloc(1, sizeof(TUIData));
ui->data = data;
data->bridge = bridge;
data->loop = &tui_loop;
data->is_starting = true;
data->screenshot = NULL;
kv_init(data->invalid_regions);
signal_watcher_init(data->loop, &data->winch_handle, ui);
signal_watcher_init(data->loop, &data->cont_handle, data);
#ifdef UNIX
signal_watcher_start(&data->cont_handle, sigcont_cb, SIGCONT);
#endif
// TODO(bfredl): zero hl is empty, send this explicitly?
kv_push(data->attrs, HLATTRS_INIT);
#if TERMKEY_VERSION_MAJOR > 0 || TERMKEY_VERSION_MINOR > 18
data->input.tk_ti_hook_fn = tui_tk_ti_getstr;
#endif
tinput_init(&data->input, &tui_loop);
tui_terminal_start(ui);
// Allow main thread to continue, we are ready to handle UI callbacks.
CONTINUE(bridge);
loop_schedule_deferred(&main_loop,
event_create(show_termcap_event, 1, data->ut));
// "Active" loop: first ~100 ms of startup.
for (size_t ms = 0; ms < 100 && !tui_is_stopped(ui);) {
ms += (loop_poll_events(&tui_loop, 20) ? 20 : 1);
}
if (!tui_is_stopped(ui)) {
tui_terminal_after_startup(ui);
}
// "Passive" (I/O-driven) loop: TUI thread "main loop".
while (!tui_is_stopped(ui)) {
loop_poll_events(&tui_loop, -1); // tui_loop.events is never processed
}
ui_bridge_stopped(bridge);
tinput_destroy(&data->input);
signal_watcher_stop(&data->cont_handle);
signal_watcher_close(&data->cont_handle, NULL);
signal_watcher_close(&data->winch_handle, NULL);
loop_close(&tui_loop, false);
kv_destroy(data->invalid_regions);
kv_destroy(data->attrs);
xfree(data->space_buf);
xfree(data);
}
/// Handoff point between the main (ui_bridge) thread and the TUI thread.
static void tui_scheduler(Event event, void *d)
{
UI *ui = d;
TUIData *data = ui->data;
loop_schedule_fast(data->loop, event); // `tui_loop` local to tui_main().
}
#ifdef UNIX
static void sigcont_cb(SignalWatcher *watcher, int signum, void *data)
{
((TUIData *)data)->cont_received = true;
}
#endif
static void sigwinch_cb(SignalWatcher *watcher, int signum, void *data)
{
got_winch = true;
UI *ui = data;
if (tui_is_stopped(ui)) {
return;
}
tui_guess_size(ui);
ui_schedule_refresh();
}
static bool attrs_differ(UI *ui, int id1, int id2, bool rgb)
{
TUIData *data = ui->data;
if (id1 == id2) {
return false;
} else if (id1 < 0 || id2 < 0) {
return true;
}
HlAttrs a1 = kv_A(data->attrs, (size_t)id1);
HlAttrs a2 = kv_A(data->attrs, (size_t)id2);
if (rgb) {
return a1.rgb_fg_color != a2.rgb_fg_color
|| a1.rgb_bg_color != a2.rgb_bg_color
|| a1.rgb_ae_attr != a2.rgb_ae_attr
|| a1.rgb_sp_color != a2.rgb_sp_color;
} else {
return a1.cterm_fg_color != a2.cterm_fg_color
|| a1.cterm_bg_color != a2.cterm_bg_color
|| a1.cterm_ae_attr != a2.cterm_ae_attr
|| (a1.cterm_ae_attr & HL_ANY_UNDERLINE
&& a1.rgb_sp_color != a2.rgb_sp_color);
}
}
static void update_attrs(UI *ui, int attr_id)
{
TUIData *data = ui->data;
if (!attrs_differ(ui, attr_id, data->print_attr_id, ui->rgb)) {
data->print_attr_id = attr_id;
return;
}
data->print_attr_id = attr_id;
HlAttrs attrs = kv_A(data->attrs, (size_t)attr_id);
int attr = ui->rgb ? attrs.rgb_ae_attr : attrs.cterm_ae_attr;
bool bold = attr & HL_BOLD;
bool italic = attr & HL_ITALIC;
bool reverse = attr & HL_INVERSE;
bool standout = attr & HL_STANDOUT;
bool strikethrough = attr & HL_STRIKETHROUGH;
bool underline;
bool underlineline;
bool undercurl;
bool underdot;
bool underdash;
if (data->unibi_ext.set_underline_style != -1) {
underline = attr & HL_UNDERLINE;
underlineline = attr & HL_UNDERLINELINE;
undercurl = attr & HL_UNDERCURL;
underdash = attr & HL_UNDERDASH;
underdot = attr & HL_UNDERDOT;
} else {
underline = attr & HL_ANY_UNDERLINE;
underlineline = false;
undercurl = false;
underdot = false;
underdash = false;
}
bool has_any_underline = undercurl || underline
|| underdot || underdash || underlineline;
if (unibi_get_str(data->ut, unibi_set_attributes)) {
if (bold || reverse || underline || standout) {
UNIBI_SET_NUM_VAR(data->params[0], standout);
UNIBI_SET_NUM_VAR(data->params[1], underline);
UNIBI_SET_NUM_VAR(data->params[2], reverse);
UNIBI_SET_NUM_VAR(data->params[3], 0); // blink
UNIBI_SET_NUM_VAR(data->params[4], 0); // dim
UNIBI_SET_NUM_VAR(data->params[5], bold);
UNIBI_SET_NUM_VAR(data->params[6], 0); // blank
UNIBI_SET_NUM_VAR(data->params[7], 0); // protect
UNIBI_SET_NUM_VAR(data->params[8], 0); // alternate character set
unibi_out(ui, unibi_set_attributes);
} else if (!data->default_attr) {
unibi_out(ui, unibi_exit_attribute_mode);
}
} else {
if (!data->default_attr) {
unibi_out(ui, unibi_exit_attribute_mode);
}
if (bold) {
unibi_out(ui, unibi_enter_bold_mode);
}
if (underline) {
unibi_out(ui, unibi_enter_underline_mode);
}
if (standout) {
unibi_out(ui, unibi_enter_standout_mode);
}
if (reverse) {
unibi_out(ui, unibi_enter_reverse_mode);
}
}
if (italic) {
unibi_out(ui, unibi_enter_italics_mode);
}
if (strikethrough && data->unibi_ext.enter_strikethrough_mode != -1) {
unibi_out_ext(ui, data->unibi_ext.enter_strikethrough_mode);
}
if (underlineline && data->unibi_ext.set_underline_style != -1) {
UNIBI_SET_NUM_VAR(data->params[0], 2);
unibi_out_ext(ui, data->unibi_ext.set_underline_style);
}
if (undercurl && data->unibi_ext.set_underline_style != -1) {
UNIBI_SET_NUM_VAR(data->params[0], 3);
unibi_out_ext(ui, data->unibi_ext.set_underline_style);
}
if (underdot && data->unibi_ext.set_underline_style != -1) {
UNIBI_SET_NUM_VAR(data->params[0], 4);
unibi_out_ext(ui, data->unibi_ext.set_underline_style);
}
if (underdash && data->unibi_ext.set_underline_style != -1) {
UNIBI_SET_NUM_VAR(data->params[0], 5);
unibi_out_ext(ui, data->unibi_ext.set_underline_style);
}
if (has_any_underline && data->unibi_ext.set_underline_color != -1) {
int color = attrs.rgb_sp_color;
if (color != -1) {
UNIBI_SET_NUM_VAR(data->params[0], (color >> 16) & 0xff); // red
UNIBI_SET_NUM_VAR(data->params[1], (color >> 8) & 0xff); // green
UNIBI_SET_NUM_VAR(data->params[2], color & 0xff); // blue
unibi_out_ext(ui, data->unibi_ext.set_underline_color);
}
}
int fg, bg;
if (ui->rgb && !(attr & HL_FG_INDEXED)) {
fg = ((attrs.rgb_fg_color != -1)
? attrs.rgb_fg_color : data->clear_attrs.rgb_fg_color);
if (fg != -1) {
UNIBI_SET_NUM_VAR(data->params[0], (fg >> 16) & 0xff); // red
UNIBI_SET_NUM_VAR(data->params[1], (fg >> 8) & 0xff); // green
UNIBI_SET_NUM_VAR(data->params[2], fg & 0xff); // blue
unibi_out_ext(ui, data->unibi_ext.set_rgb_foreground);
}
} else {
fg = (attrs.cterm_fg_color
? attrs.cterm_fg_color - 1 : (data->clear_attrs.cterm_fg_color - 1));
if (fg != -1) {
UNIBI_SET_NUM_VAR(data->params[0], fg);
unibi_out(ui, unibi_set_a_foreground);
}
}
if (ui->rgb && !(attr & HL_BG_INDEXED)) {
bg = ((attrs.rgb_bg_color != -1)
? attrs.rgb_bg_color : data->clear_attrs.rgb_bg_color);
if (bg != -1) {
UNIBI_SET_NUM_VAR(data->params[0], (bg >> 16) & 0xff); // red
UNIBI_SET_NUM_VAR(data->params[1], (bg >> 8) & 0xff); // green
UNIBI_SET_NUM_VAR(data->params[2], bg & 0xff); // blue
unibi_out_ext(ui, data->unibi_ext.set_rgb_background);
}
} else {
bg = (attrs.cterm_bg_color
? attrs.cterm_bg_color - 1 : (data->clear_attrs.cterm_bg_color - 1));
if (bg != -1) {
UNIBI_SET_NUM_VAR(data->params[0], bg);
unibi_out(ui, unibi_set_a_background);
}
}
data->default_attr = fg == -1 && bg == -1
&& !bold && !italic && !has_any_underline && !reverse && !standout
&& !strikethrough;
// Non-BCE terminals can't clear with non-default background color. Some BCE
// terminals don't support attributes either, so don't rely on it. But assume
// italic and bold has no effect if there is no text.
data->can_clear_attr = !reverse && !standout && !has_any_underline
&& !strikethrough && (data->bce || bg == -1);
}
static void final_column_wrap(UI *ui)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
if (grid->row != -1 && grid->col == ui->width) {
grid->col = 0;
if (grid->row < MIN(ui->height, grid->height - 1)) {
grid->row++;
}
}
}
/// It is undocumented, but in the majority of terminals and terminal emulators
/// printing at the right margin does not cause an automatic wrap until the
/// next character is printed, holding the cursor in place until then.
static void print_cell(UI *ui, UCell *ptr)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
if (!data->immediate_wrap_after_last_column) {
// Printing the next character finally advances the cursor.
final_column_wrap(ui);
}
update_attrs(ui, ptr->attr);
out(ui, ptr->data, strlen(ptr->data));
grid->col++;
if (data->immediate_wrap_after_last_column) {
// Printing at the right margin immediately advances the cursor.
final_column_wrap(ui);
}
}
static bool cheap_to_print(UI *ui, int row, int col, int next)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
UCell *cell = grid->cells[row] + col;
while (next) {
next--;
if (attrs_differ(ui, cell->attr,
data->print_attr_id, ui->rgb)) {
if (data->default_attr) {
return false;
}
}
if (strlen(cell->data) > 1) {
return false;
}
cell++;
}
return true;
}
/// This optimizes several cases where it is cheaper to do something other
/// than send a full cursor positioning control sequence. However, there are
/// some further optimizations that may seem obvious but that will not work.
///
/// We cannot use VT (ASCII 0/11) for moving the cursor up, because VT means
/// move the cursor down on a DEC terminal. Similarly, on a DEC terminal FF
/// (ASCII 0/12) means the same thing and does not mean home. VT, CVT, and
/// TAB also stop at software-defined tabulation stops, not at a fixed set
/// of row/column positions.
static void cursor_goto(UI *ui, int row, int col)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
if (row == grid->row && col == grid->col) {
return;
}
if (0 == row && 0 == col) {
unibi_out(ui, unibi_cursor_home);
ugrid_goto(grid, row, col);
return;
}
if (grid->row == -1) {
goto safe_move;
}
if (0 == col ? col != grid->col :
row != grid->row ? false :
1 == col ? 2 < grid->col && cheap_to_print(ui, grid->row, 0, col) :
2 == col ? 5 < grid->col && cheap_to_print(ui, grid->row, 0, col) :
false) {
// Motion to left margin from anywhere else, or CR + printing chars is
// even less expensive than using BSes or CUB.
unibi_out(ui, unibi_carriage_return);
ugrid_goto(grid, grid->row, 0);
}
if (row == grid->row) {
if (col < grid->col
// Deferred right margin wrap terminals have inconsistent ideas about
// where the cursor actually is during a deferred wrap. Relative
// motion calculations have OBOEs that cannot be compensated for,
// because two terminals that claim to be the same will implement
// different cursor positioning rules.
&& (data->immediate_wrap_after_last_column || grid->col < ui->width)) {
int n = grid->col - col;
if (n <= 4) { // This might be just BS, so it is considered really cheap.
while (n--) {
unibi_out(ui, unibi_cursor_left);
}
} else {
UNIBI_SET_NUM_VAR(data->params[0], n);
unibi_out(ui, unibi_parm_left_cursor);
}
ugrid_goto(grid, row, col);
return;
} else if (col > grid->col) {
int n = col - grid->col;
if (n <= 2) {
while (n--) {
unibi_out(ui, unibi_cursor_right);
}
} else {
UNIBI_SET_NUM_VAR(data->params[0], n);
unibi_out(ui, unibi_parm_right_cursor);
}
ugrid_goto(grid, row, col);
return;
}
}
if (col == grid->col) {
if (row > grid->row) {
int n = row - grid->row;
if (n <= 4) { // This might be just LF, so it is considered really cheap.
while (n--) {
unibi_out(ui, unibi_cursor_down);
}
} else {
UNIBI_SET_NUM_VAR(data->params[0], n);
unibi_out(ui, unibi_parm_down_cursor);
}
ugrid_goto(grid, row, col);
return;
} else if (row < grid->row) {
int n = grid->row - row;
if (n <= 2) {
while (n--) {
unibi_out(ui, unibi_cursor_up);
}
} else {
UNIBI_SET_NUM_VAR(data->params[0], n);
unibi_out(ui, unibi_parm_up_cursor);
}
ugrid_goto(grid, row, col);
return;
}
}
safe_move:
unibi_goto(ui, row, col);
ugrid_goto(grid, row, col);
}
static void clear_region(UI *ui, int top, int bot, int left, int right, int attr_id)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
update_attrs(ui, attr_id);
// Background is set to the default color and the right edge matches the
// screen end, try to use terminal codes for clearing the requested area.
if (data->can_clear_attr
&& left == 0 && right == ui->width && bot == ui->height) {
if (top == 0) {
unibi_out(ui, unibi_clear_screen);
ugrid_goto(&data->grid, top, left);
} else {
cursor_goto(ui, top, 0);
unibi_out(ui, unibi_clr_eos);
}
} else {
int width = right - left;
// iterate through each line and clear
for (int row = top; row < bot; row++) {
cursor_goto(ui, row, left);
if (data->can_clear_attr && right == ui->width) {
unibi_out(ui, unibi_clr_eol);
} else if (data->can_erase_chars && data->can_clear_attr && width >= 5) {
UNIBI_SET_NUM_VAR(data->params[0], width);
unibi_out(ui, unibi_erase_chars);
} else {
out(ui, data->space_buf, (size_t)width);
grid->col += width;
if (data->immediate_wrap_after_last_column) {
// Printing at the right margin immediately advances the cursor.
final_column_wrap(ui);
}
}
}
}
}
static void set_scroll_region(UI *ui, int top, int bot, int left, int right)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
UNIBI_SET_NUM_VAR(data->params[0], top);
UNIBI_SET_NUM_VAR(data->params[1], bot);
unibi_out(ui, unibi_change_scroll_region);
if (left != 0 || right != ui->width - 1) {
unibi_out_ext(ui, data->unibi_ext.enable_lr_margin);
if (data->can_set_lr_margin) {
UNIBI_SET_NUM_VAR(data->params[0], left);
UNIBI_SET_NUM_VAR(data->params[1], right);
unibi_out(ui, unibi_set_lr_margin);
} else {
UNIBI_SET_NUM_VAR(data->params[0], left);
unibi_out(ui, unibi_set_left_margin_parm);
UNIBI_SET_NUM_VAR(data->params[0], right);
unibi_out(ui, unibi_set_right_margin_parm);
}
}
grid->row = -1;
}
static void reset_scroll_region(UI *ui, bool fullwidth)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
if (0 <= data->unibi_ext.reset_scroll_region) {
unibi_out_ext(ui, data->unibi_ext.reset_scroll_region);
} else {
UNIBI_SET_NUM_VAR(data->params[0], 0);
UNIBI_SET_NUM_VAR(data->params[1], ui->height - 1);
unibi_out(ui, unibi_change_scroll_region);
}
if (!fullwidth) {
if (data->can_set_lr_margin) {
UNIBI_SET_NUM_VAR(data->params[0], 0);
UNIBI_SET_NUM_VAR(data->params[1], ui->width - 1);
unibi_out(ui, unibi_set_lr_margin);
} else {
UNIBI_SET_NUM_VAR(data->params[0], 0);
unibi_out(ui, unibi_set_left_margin_parm);
UNIBI_SET_NUM_VAR(data->params[0], ui->width - 1);
unibi_out(ui, unibi_set_right_margin_parm);
}
unibi_out_ext(ui, data->unibi_ext.disable_lr_margin);
}
grid->row = -1;
}
static void tui_grid_resize(UI *ui, Integer g, Integer width, Integer height)
{
TUIData *data = ui->data;
UGrid *grid = &data->grid;
ugrid_resize(grid, (int)width, (int)height);
xfree(data->space_buf);
data->space_buf = xmalloc((size_t)width * sizeof(*data->space_buf));
memset(data->space_buf, ' ', (size_t)width);
// resize might not always be followed by a clear before flush
// so clip the invalid region
for (size_t i = 0; i < kv_size(data->invalid_regions); i++) {
Rect *r = &kv_A(data->invalid_regions, i);
r->bot = MIN(r->bot, grid->height);
r->right = MIN(r->right, grid->width);
}
if (!got_winch && (!data->is_starting || did_user_set_dimensions)) {
// Resize the _host_ terminal.
UNIBI_SET_NUM_VAR(data->params[0], (int)height);
UNIBI_SET_NUM_VAR(data->params[1], (int)width);
unibi_out_ext(ui, data->unibi_ext.resize_screen);
// DECSLPP does not reset the scroll region.
if (data->scroll_region_is_full_screen) {
reset_scroll_region(ui, ui->width == grid->width);
}
} else { // Already handled the SIGWINCH signal; avoid double-resize.
got_winch = false;