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Switch screen.h free functions to member functions on screen_t

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Refactoring only, no functional change here.
This commit is contained in:
ridiculousfish 2021-09-21 12:51:04 -07:00
parent 26f3cee86c
commit 8878672014
3 changed files with 258 additions and 242 deletions
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18
src/reader.cpp
View file

@ -1092,9 +1092,9 @@ void reader_data_t::paint_layout(const wchar_t *reason) {
indents.resize(full_line.size(), 0); indents.resize(full_line.size(), 0);
// Prepend the mode prompt to the left prompt. // Prepend the mode prompt to the left prompt.
s_write(&screen, mode_prompt_buff + left_prompt_buff, right_prompt_buff, full_line, screen.write(mode_prompt_buff + left_prompt_buff, right_prompt_buff, full_line,
cmd_line->size(), colors, indents, data.position, pager, current_page_rendering, cmd_line->size(), colors, indents, data.position, pager, current_page_rendering,
data.focused_on_pager); data.focused_on_pager);
} }
/// Internal helper function for handling killing parts of text. /// Internal helper function for handling killing parts of text.
@ -2618,7 +2618,7 @@ void reader_pop() {
reader_interactive_destroy(); reader_interactive_destroy();
*commandline_state_snapshot() = commandline_state_t{}; *commandline_state_snapshot() = commandline_state_t{};
} else { } else {
s_reset_abandoning_line(&new_reader->screen, termsize_last().width); new_reader->screen.reset_abandoning_line(termsize_last().width);
new_reader->update_commandline_state(); new_reader->update_commandline_state();
} }
} }
@ -3000,7 +3000,7 @@ void reader_data_t::handle_readline_command(readline_cmd_t c, readline_loop_stat
outp.push_back('\n'); outp.push_back('\n');
set_command_line_and_position(&command_line, L"", 0); set_command_line_and_position(&command_line, L"", 0);
s_reset_abandoning_line(&screen, termsize_last().width - command_line.size()); screen.reset_abandoning_line(termsize_last().width - command_line.size());
// Post fish_cancel. // Post fish_cancel.
event_fire_generic(parser(), L"fish_cancel"); event_fire_generic(parser(), L"fish_cancel");
@ -3038,7 +3038,7 @@ void reader_data_t::handle_readline_command(readline_cmd_t c, readline_loop_stat
parser().libdata().is_repaint = true; parser().libdata().is_repaint = true;
exec_mode_prompt(); exec_mode_prompt();
if (!mode_prompt_buff.empty()) { if (!mode_prompt_buff.empty()) {
s_reset_line(&screen, true /* redraw prompt */); screen.reset_line(true /* redraw prompt */);
if (this->is_repaint_needed()) this->layout_and_repaint(L"mode"); if (this->is_repaint_needed()) this->layout_and_repaint(L"mode");
parser().libdata().is_repaint = false; parser().libdata().is_repaint = false;
break; break;
@ -3050,7 +3050,7 @@ void reader_data_t::handle_readline_command(readline_cmd_t c, readline_loop_stat
case rl::repaint: { case rl::repaint: {
parser().libdata().is_repaint = true; parser().libdata().is_repaint = true;
exec_prompt(); exec_prompt();
s_reset_line(&screen, true /* redraw prompt */); screen.reset_line(true /* redraw prompt */);
this->layout_and_repaint(L"readline"); this->layout_and_repaint(L"readline");
force_exec_prompt_and_repaint = false; force_exec_prompt_and_repaint = false;
parser().libdata().is_repaint = false; parser().libdata().is_repaint = false;
@ -3370,7 +3370,7 @@ void reader_data_t::handle_readline_command(readline_cmd_t c, readline_loop_stat
// already be printed, all we need to do is repaint. // already be printed, all we need to do is repaint.
wcstring_list_t argv(1, el->text()); wcstring_list_t argv(1, el->text());
event_fire_generic(parser(), L"fish_posterror", &argv); event_fire_generic(parser(), L"fish_posterror", &argv);
s_reset_abandoning_line(&screen, termsize_last().width); screen.reset_abandoning_line(termsize_last().width);
} }
break; break;
} }
@ -3950,7 +3950,7 @@ maybe_t<wcstring> reader_data_t::readline(int nchars_or_0) {
// //
// I can't see a good way around this. // I can't see a good way around this.
if (!first_prompt) { if (!first_prompt) {
s_reset_abandoning_line(&screen, termsize_last().width); screen.reset_abandoning_line(termsize_last().width);
} }
first_prompt = false; first_prompt = false;

367
src/screen.cpp
View file

@ -46,10 +46,8 @@
/// The number of characters to indent new blocks. /// The number of characters to indent new blocks.
#define INDENT_STEP 4u #define INDENT_STEP 4u
static void invalidate_soft_wrap(screen_t *scr);
/// RAII class to begin and end buffering around stdoutput(). /// RAII class to begin and end buffering around stdoutput().
class scoped_buffer_t { class screen_t::scoped_buffer_t {
screen_t &screen_; screen_t &screen_;
public: public:
@ -466,17 +464,14 @@ static size_t calc_prompt_lines(const wcstring &prompt) {
/// Stat stdout and stderr and save result. This should be done before calling a function that may /// Stat stdout and stderr and save result. This should be done before calling a function that may
/// cause output. /// cause output.
void s_save_status(screen_t *s) { void screen_t::save_status() {
fstat(STDOUT_FILENO, &s->prev_buff_1); fstat(STDOUT_FILENO, &this->prev_buff_1);
fstat(STDERR_FILENO, &s->prev_buff_2); fstat(STDERR_FILENO, &this->prev_buff_2);
} }
/// Stat stdout and stderr and compare result to previous result in reader_save_status. Repaint if /// Stat stdout and stderr and compare result to previous result in reader_save_status. Repaint if
/// modification time has changed. /// modification time has changed.
/// void screen_t::check_status() {
/// Unfortunately, for some reason this call seems to give a lot of false positives, at least under
/// Linux.
static void s_check_status(screen_t *s) {
fflush(stdout); fflush(stdout);
fflush(stderr); fflush(stderr);
if (!has_working_tty_timestamps) { if (!has_working_tty_timestamps) {
@ -491,15 +486,16 @@ static void s_check_status(screen_t *s) {
fstat(STDOUT_FILENO, &post_buff_1); fstat(STDOUT_FILENO, &post_buff_1);
fstat(STDERR_FILENO, &post_buff_2); fstat(STDERR_FILENO, &post_buff_2);
bool changed = (s->prev_buff_1.st_mtime != post_buff_1.st_mtime) || bool changed = (this->prev_buff_1.st_mtime != post_buff_1.st_mtime) ||
(s->prev_buff_2.st_mtime != post_buff_2.st_mtime); (this->prev_buff_2.st_mtime != post_buff_2.st_mtime);
#if defined HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC #if defined HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC
changed = changed || s->prev_buff_1.st_mtimespec.tv_nsec != post_buff_1.st_mtimespec.tv_nsec || changed = changed ||
s->prev_buff_2.st_mtimespec.tv_nsec != post_buff_2.st_mtimespec.tv_nsec; this->prev_buff_1.st_mtimespec.tv_nsec != post_buff_1.st_mtimespec.tv_nsec ||
this->prev_buff_2.st_mtimespec.tv_nsec != post_buff_2.st_mtimespec.tv_nsec;
#elif defined HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC #elif defined HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
changed = changed || s->prev_buff_1.st_mtim.tv_nsec != post_buff_1.st_mtim.tv_nsec || changed = changed || this->prev_buff_1.st_mtim.tv_nsec != post_buff_1.st_mtim.tv_nsec ||
s->prev_buff_2.st_mtim.tv_nsec != post_buff_2.st_mtim.tv_nsec; this->prev_buff_2.st_mtim.tv_nsec != post_buff_2.st_mtim.tv_nsec;
#endif #endif
if (changed) { if (changed) {
@ -507,99 +503,91 @@ static void s_check_status(screen_t *s) {
// know where the cursor is. It is our best bet that we are still on the same line, so we // know where the cursor is. It is our best bet that we are still on the same line, so we
// move to the beginning of the line, reset the modelled screen contents, and then set the // move to the beginning of the line, reset the modelled screen contents, and then set the
// modeled cursor y-pos to its earlier value. // modeled cursor y-pos to its earlier value.
int prev_line = s->actual.cursor.y; int prev_line = this->actual.cursor.y;
s_reset_line(s, true /* repaint prompt */); this->reset_line(true /* repaint prompt */);
s->actual.cursor.y = prev_line; this->actual.cursor.y = prev_line;
} }
} }
/// Appends a character to the end of the line that the output cursor is on. This function void screen_t::desired_append_char(wchar_t b, highlight_spec_t c, int indent, size_t prompt_width,
/// automatically handles linebreaks and lines longer than the screen width. size_t bwidth) {
static void s_desired_append_char(screen_t *s, wchar_t b, highlight_spec_t c, int indent, int line_no = this->desired.cursor.y;
size_t prompt_width, size_t bwidth) {
int line_no = s->desired.cursor.y;
if (b == L'\n') { if (b == L'\n') {
// Current line is definitely hard wrapped. // Current line is definitely hard wrapped.
// Create the next line. // Create the next line.
s->desired.create_line(s->desired.cursor.y + 1); this->desired.create_line(this->desired.cursor.y + 1);
s->desired.line(s->desired.cursor.y).is_soft_wrapped = false; this->desired.line(this->desired.cursor.y).is_soft_wrapped = false;
int line_no = ++s->desired.cursor.y; int line_no = ++this->desired.cursor.y;
s->desired.cursor.x = 0; this->desired.cursor.x = 0;
size_t indentation = prompt_width + indent * INDENT_STEP; size_t indentation = prompt_width + indent * INDENT_STEP;
line_t &line = s->desired.line(line_no); line_t &line = this->desired.line(line_no);
line.indentation = indentation; line.indentation = indentation;
for (size_t i = 0; i < indentation; i++) { for (size_t i = 0; i < indentation; i++) {
s_desired_append_char(s, L' ', highlight_spec_t{}, indent, prompt_width, 1); desired_append_char(L' ', highlight_spec_t{}, indent, prompt_width, 1);
} }
} else if (b == L'\r') { } else if (b == L'\r') {
line_t &current = s->desired.line(line_no); line_t &current = this->desired.line(line_no);
current.clear(); current.clear();
s->desired.cursor.x = 0; this->desired.cursor.x = 0;
} else { } else {
int screen_width = s->desired.screen_width; int screen_width = this->desired.screen_width;
int cw = bwidth; int cw = bwidth;
s->desired.create_line(line_no); this->desired.create_line(line_no);
// Check if we are at the end of the line. If so, continue on the next line. // Check if we are at the end of the line. If so, continue on the next line.
if ((s->desired.cursor.x + cw) > screen_width) { if ((this->desired.cursor.x + cw) > screen_width) {
// Current line is soft wrapped (assuming we support it). // Current line is soft wrapped (assuming we support it).
s->desired.line(s->desired.cursor.y).is_soft_wrapped = true; this->desired.line(this->desired.cursor.y).is_soft_wrapped = true;
line_no = static_cast<int>(s->desired.line_count()); line_no = static_cast<int>(this->desired.line_count());
s->desired.add_line(); this->desired.add_line();
s->desired.cursor.y++; this->desired.cursor.y++;
s->desired.cursor.x = 0; this->desired.cursor.x = 0;
} }
line_t &line = s->desired.line(line_no); line_t &line = this->desired.line(line_no);
line.append(b, c); line.append(b, c);
s->desired.cursor.x += cw; this->desired.cursor.x += cw;
// Maybe wrap the cursor to the next line, even if the line itself did not wrap. This // Maybe wrap the cursor to the next line, even if the line itself did not wrap. This
// avoids wonkiness in the last column. // avoids wonkiness in the last column.
if (s->desired.cursor.x >= screen_width) { if (this->desired.cursor.x >= screen_width) {
line.is_soft_wrapped = true; line.is_soft_wrapped = true;
s->desired.cursor.x = 0; this->desired.cursor.x = 0;
s->desired.cursor.y++; this->desired.cursor.y++;
} }
} }
} }
/// Write the bytes needed to move screen cursor to the specified position to the specified buffer. void screen_t::move(int new_x, int new_y) {
/// The actual_cursor field of the specified screen_t will be updated. if (this->actual.cursor.x == new_x && this->actual.cursor.y == new_y) return;
///
/// \param s the screen to operate on
/// \param new_x the new x position
/// \param new_y the new y position
static void s_move(screen_t *s, int new_x, int new_y) {
if (s->actual.cursor.x == new_x && s->actual.cursor.y == new_y) return;
const scoped_buffer_t buffering(*s); const scoped_buffer_t buffering(*this);
// If we are at the end of our window, then either the cursor stuck to the edge or it didn't. We // If we are at the end of our window, then either the cursor stuck to the edge or it didn't. We
// don't know! We can fix it up though. // don't know! We can fix it up though.
if (s->actual.cursor.x == s->actual.screen_width) { if (this->actual.cursor.x == this->actual.screen_width) {
// Either issue a cr to go back to the beginning of this line, or a nl to go to the // Either issue a cr to go back to the beginning of this line, or a nl to go to the
// beginning of the next one, depending on what we think is more efficient. // beginning of the next one, depending on what we think is more efficient.
if (new_y <= s->actual.cursor.y) { if (new_y <= this->actual.cursor.y) {
s->outp().push_back('\r'); this->outp().push_back('\r');
} else { } else {
s->outp().push_back('\n'); this->outp().push_back('\n');
s->actual.cursor.y++; this->actual.cursor.y++;
} }
// Either way we're not in the first column. // Either way we're not in the first column.
s->actual.cursor.x = 0; this->actual.cursor.x = 0;
} }
int i; int i;
int x_steps, y_steps; int x_steps, y_steps;
const char *str; const char *str;
auto &outp = s->outp(); auto &outp = this->outp();
y_steps = new_y - s->actual.cursor.y; y_steps = new_y - this->actual.cursor.y;
if (y_steps < 0) { if (y_steps < 0) {
str = cursor_up; str = cursor_up;
@ -613,7 +601,7 @@ static void s_move(screen_t *s, int new_x, int new_y) {
// We could do: // We could do:
// if (std::strcmp(cursor_up, "\x1B[A") == 0) str = "\x1B[B"; // if (std::strcmp(cursor_up, "\x1B[A") == 0) str = "\x1B[B";
// else ... but that doesn't work for unknown reasons. // else ... but that doesn't work for unknown reasons.
s->actual.cursor.x = 0; this->actual.cursor.x = 0;
} }
} }
@ -621,7 +609,7 @@ static void s_move(screen_t *s, int new_x, int new_y) {
writembs(outp, str); writembs(outp, str);
} }
x_steps = new_x - s->actual.cursor.x; x_steps = new_x - this->actual.cursor.x;
if (x_steps && new_x == 0) { if (x_steps && new_x == 0) {
outp.push_back('\r'); outp.push_back('\r');
@ -650,32 +638,32 @@ static void s_move(screen_t *s, int new_x, int new_y) {
} }
} }
s->actual.cursor.x = new_x; this->actual.cursor.x = new_x;
s->actual.cursor.y = new_y; this->actual.cursor.y = new_y;
} }
/// Convert a wide character to a multibyte string and append it to the buffer. /// Convert a wide character to a multibyte string and append it to the buffer.
static void s_write_char(screen_t *s, wchar_t c, size_t width) { void screen_t::write_char(wchar_t c, size_t width) {
scoped_buffer_t outp(*s); scoped_buffer_t outp(*this);
s->actual.cursor.x += width; this->actual.cursor.x += width;
s->outp().writech(c); this->outp().writech(c);
if (s->actual.cursor.x == s->actual.screen_width && allow_soft_wrap()) { if (this->actual.cursor.x == this->actual.screen_width && allow_soft_wrap()) {
s->soft_wrap_location = screen_data_t::cursor_t{0, s->actual.cursor.y + 1}; this->soft_wrap_location = screen_data_t::cursor_t{0, this->actual.cursor.y + 1};
// Note that our cursor position may be a lie: Apple Terminal makes the right cursor stick // Note that our cursor position may be a lie: Apple Terminal makes the right cursor stick
// to the margin, while Ubuntu makes it "go off the end" (but still doesn't wrap). We rely // to the margin, while Ubuntu makes it "go off the end" (but still doesn't wrap). We rely
// on s_move to fix this up. // on s_move to fix this up.
} else { } else {
invalidate_soft_wrap(s); this->soft_wrap_location = none();
} }
} }
/// Send the specified string through tputs and append the output to the screen's outputter. /// Send the specified string through tputs and append the output to the screen's outputter.
static void s_write_mbs(screen_t *screen, const char *s) { writembs(screen->outp(), s); } void screen_t::write_mbs(const char *s) { writembs(this->outp(), s); }
/// Convert a wide string to a multibyte string and append it to the buffer. /// Convert a wide string to a multibyte string and append it to the buffer.
static void s_write_str(screen_t *screen, const wchar_t *s) { screen->outp().writestr(s); } void screen_t::write_str(const wchar_t *s) { this->outp().writestr(s); }
static void s_write_str(screen_t *screen, const wcstring &s) { screen->outp().writestr(s); } void screen_t::write_str(const wcstring &s) { this->outp().writestr(s); }
/// Returns the length of the "shared prefix" of the two lines, which is the run of matching text /// Returns the length of the "shared prefix" of the two lines, which is the run of matching text
/// and colors. If the prefix ends on a combining character, do not include the previous character /// and colors. If the prefix ends on a combining character, do not include the previous character
@ -714,37 +702,34 @@ static size_t line_shared_prefix(const line_t &a, const line_t &b) {
// end of previous line, and the previous line is marked as soft wrapping, then tweak the screen so // end of previous line, and the previous line is marked as soft wrapping, then tweak the screen so
// we believe we are already in the target position. This lets the terminal take care of wrapping, // we believe we are already in the target position. This lets the terminal take care of wrapping,
// which means that if you copy and paste the text, it won't have an embedded newline. // which means that if you copy and paste the text, it won't have an embedded newline.
static bool perform_any_impending_soft_wrap(screen_t *scr, int x, int y) { bool screen_t::handle_soft_wrap(int x, int y) {
if (scr->soft_wrap_location && x == scr->soft_wrap_location->x && if (this->soft_wrap_location && x == this->soft_wrap_location->x &&
y == scr->soft_wrap_location->y) { //!OCLINT y == this->soft_wrap_location->y) { //!OCLINT
// We can soft wrap; but do we want to? // We can soft wrap; but do we want to?
if (scr->desired.line(y - 1).is_soft_wrapped && allow_soft_wrap()) { if (this->desired.line(y - 1).is_soft_wrapped && allow_soft_wrap()) {
// Yes. Just update the actual cursor; that will cause us to elide emitting the commands // Yes. Just update the actual cursor; that will cause us to elide emitting the commands
// to move here, so we will just output on "one big line" (which the terminal soft // to move here, so we will just output on "one big line" (which the terminal soft
// wraps. // wraps.
scr->actual.cursor = scr->soft_wrap_location.value(); this->actual.cursor = this->soft_wrap_location.value();
} }
} }
return false; return false;
} }
/// Make sure we don't soft wrap.
static void invalidate_soft_wrap(screen_t *scr) { scr->soft_wrap_location = none(); }
/// Update the screen to match the desired output. /// Update the screen to match the desired output.
static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring &right_prompt) { void screen_t::update(const wcstring &left_prompt, const wcstring &right_prompt) {
// TODO: this should be passed in. // TODO: this should be passed in.
const environment_t &vars = env_stack_t::principal(); const environment_t &vars = env_stack_t::principal();
// Helper function to set a resolved color, using the caching resolver. // Helper function to set a resolved color, using the caching resolver.
highlight_color_resolver_t color_resolver{}; highlight_color_resolver_t color_resolver{};
auto set_color = [&](highlight_spec_t c) { auto set_color = [&](highlight_spec_t c) {
scr->outp().set_color(color_resolver.resolve_spec(c, false, vars), this->outp().set_color(color_resolver.resolve_spec(c, false, vars),
color_resolver.resolve_spec(c, true, vars)); color_resolver.resolve_spec(c, true, vars));
}; };
layout_cache_t &cached_layouts = layout_cache_t::shared; layout_cache_t &cached_layouts = layout_cache_t::shared;
const scoped_buffer_t buffering(*scr); const scoped_buffer_t buffering(*this);
// Determine size of left and right prompt. Note these have already been truncated. // Determine size of left and right prompt. Note these have already been truncated.
const prompt_layout_t left_prompt_layout = cached_layouts.calc_prompt_layout(left_prompt); const prompt_layout_t left_prompt_layout = cached_layouts.calc_prompt_layout(left_prompt);
@ -753,56 +738,56 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
cached_layouts.calc_prompt_layout(right_prompt).last_line_width; cached_layouts.calc_prompt_layout(right_prompt).last_line_width;
// Figure out how many following lines we need to clear (probably 0). // Figure out how many following lines we need to clear (probably 0).
size_t actual_lines_before_reset = scr->actual_lines_before_reset; size_t actual_lines_before_reset = this->actual_lines_before_reset;
scr->actual_lines_before_reset = 0; this->actual_lines_before_reset = 0;
bool need_clear_lines = scr->need_clear_lines; bool need_clear_lines = this->need_clear_lines;
bool need_clear_screen = scr->need_clear_screen; bool need_clear_screen = this->need_clear_screen;
bool has_cleared_screen = false; bool has_cleared_screen = false;
const int screen_width = scr->desired.screen_width; const int screen_width = this->desired.screen_width;
if (scr->actual.screen_width != screen_width) { if (this->actual.screen_width != screen_width) {
// Ensure we don't issue a clear screen for the very first output, to avoid issue #402. // Ensure we don't issue a clear screen for the very first output, to avoid issue #402.
if (scr->actual.screen_width > 0) { if (this->actual.screen_width > 0) {
need_clear_screen = true; need_clear_screen = true;
s_move(scr, 0, 0); this->move(0, 0);
s_reset_line(scr); this->reset_line();
need_clear_lines = need_clear_lines || scr->need_clear_lines; need_clear_lines = need_clear_lines || this->need_clear_lines;
need_clear_screen = need_clear_screen || scr->need_clear_screen; need_clear_screen = need_clear_screen || this->need_clear_screen;
} }
scr->actual.screen_width = screen_width; this->actual.screen_width = screen_width;
} }
scr->need_clear_lines = false; this->need_clear_lines = false;
scr->need_clear_screen = false; this->need_clear_screen = false;
// Determine how many lines have stuff on them; we need to clear lines with stuff that we don't // Determine how many lines have stuff on them; we need to clear lines with stuff that we don't
// want. // want.
const size_t lines_with_stuff = std::max(actual_lines_before_reset, scr->actual.line_count()); const size_t lines_with_stuff = std::max(actual_lines_before_reset, this->actual.line_count());
if (scr->desired.line_count() < lines_with_stuff) need_clear_screen = true; if (this->desired.line_count() < lines_with_stuff) need_clear_screen = true;
// Output the left prompt if it has changed. // Output the left prompt if it has changed.
if (left_prompt != scr->actual_left_prompt) { if (left_prompt != this->actual_left_prompt) {
s_move(scr, 0, 0); this->move(0, 0);
size_t start = 0; size_t start = 0;
for (const size_t line_break : left_prompt_layout.line_breaks) { for (const size_t line_break : left_prompt_layout.line_breaks) {
s_write_str(scr, left_prompt.substr(start, line_break - start)); this->write_str(left_prompt.substr(start, line_break - start));
if (clr_eol) { if (clr_eol) {
s_write_mbs(scr, clr_eol); this->write_mbs(clr_eol);
} }
start = line_break; start = line_break;
} }
s_write_str(scr, left_prompt.substr(start)); this->write_str(left_prompt.substr(start));
scr->actual_left_prompt = left_prompt; this->actual_left_prompt = left_prompt;
scr->actual.cursor.x = static_cast<int>(left_prompt_width); this->actual.cursor.x = static_cast<int>(left_prompt_width);
} }
// Output all lines. // Output all lines.
for (size_t i = 0; i < scr->desired.line_count(); i++) { for (size_t i = 0; i < this->desired.line_count(); i++) {
const line_t &o_line = scr->desired.line(i); const line_t &o_line = this->desired.line(i);
line_t &s_line = scr->actual.create_line(i); line_t &s_line = this->actual.create_line(i);
size_t start_pos = i == 0 ? left_prompt_width : 0; size_t start_pos = i == 0 ? left_prompt_width : 0;
int current_width = 0; int current_width = 0;
bool has_cleared_line = false; bool has_cleared_line = false;
@ -810,9 +795,9 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
// If this is the last line, maybe we should clear the screen. // If this is the last line, maybe we should clear the screen.
// Don't issue clr_eos if we think the cursor will end up in the last column - see #6951. // Don't issue clr_eos if we think the cursor will end up in the last column - see #6951.
const bool should_clear_screen_this_line = const bool should_clear_screen_this_line =
need_clear_screen && i + 1 == scr->desired.line_count() && clr_eos != nullptr && need_clear_screen && i + 1 == this->desired.line_count() && clr_eos != nullptr &&
!(scr->desired.cursor.x == 0 && !(this->desired.cursor.x == 0 &&
scr->desired.cursor.y == static_cast<int>(scr->desired.line_count())); this->desired.cursor.y == static_cast<int>(this->desired.line_count()));
// skip_remaining is how many columns are unchanged on this line. // skip_remaining is how many columns are unchanged on this line.
// Note that skip_remaining is a width, not a character count. // Note that skip_remaining is a width, not a character count.
@ -824,8 +809,8 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
if (o_line.indentation > s_line.indentation && !has_cleared_screen && clr_eol && if (o_line.indentation > s_line.indentation && !has_cleared_screen && clr_eol &&
clr_eos) { clr_eos) {
set_color(highlight_spec_t{}); set_color(highlight_spec_t{});
s_move(scr, 0, static_cast<int>(i)); this->move(0, static_cast<int>(i));
s_write_mbs(scr, should_clear_screen_this_line ? clr_eos : clr_eol); this->write_mbs(should_clear_screen_this_line ? clr_eos : clr_eol);
has_cleared_screen = should_clear_screen_this_line; has_cleared_screen = should_clear_screen_this_line;
has_cleared_line = true; has_cleared_line = true;
} }
@ -844,16 +829,17 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
if (!should_clear_screen_this_line) { if (!should_clear_screen_this_line) {
// If we're soft wrapped, and if we're going to change the first character of the next // If we're soft wrapped, and if we're going to change the first character of the next
// line, don't skip over the last two characters so that we maintain soft-wrapping. // line, don't skip over the last two characters so that we maintain soft-wrapping.
if (o_line.is_soft_wrapped && i + 1 < scr->desired.line_count()) { if (o_line.is_soft_wrapped && i + 1 < this->desired.line_count()) {
bool next_line_will_change = true; bool next_line_will_change = true;
if (i + 1 < scr->actual.line_count()) { //!OCLINT if (i + 1 < this->actual.line_count()) { //!OCLINT
if (line_shared_prefix(scr->desired.line(i + 1), scr->actual.line(i + 1)) > 0) { if (line_shared_prefix(this->desired.line(i + 1), this->actual.line(i + 1)) >
0) {
next_line_will_change = false; next_line_will_change = false;
} }
} }
if (next_line_will_change) { if (next_line_will_change) {
skip_remaining = skip_remaining = std::min(skip_remaining,
std::min(skip_remaining, static_cast<size_t>(scr->actual.screen_width - 2)); static_cast<size_t>(this->actual.screen_width - 2));
} }
} }
} }
@ -884,17 +870,17 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
if (should_clear_screen_this_line && !has_cleared_screen && if (should_clear_screen_this_line && !has_cleared_screen &&
(done || j + 1 == static_cast<size_t>(screen_width))) { (done || j + 1 == static_cast<size_t>(screen_width))) {
set_color(highlight_spec_t{}); set_color(highlight_spec_t{});
s_move(scr, current_width, static_cast<int>(i)); this->move(current_width, static_cast<int>(i));
s_write_mbs(scr, clr_eos); this->write_mbs(clr_eos);
has_cleared_screen = true; has_cleared_screen = true;
} }
if (done) break; if (done) break;
perform_any_impending_soft_wrap(scr, current_width, static_cast<int>(i)); this->handle_soft_wrap(current_width, static_cast<int>(i));
s_move(scr, current_width, static_cast<int>(i)); this->move(current_width, static_cast<int>(i));
set_color(o_line.color_at(j)); set_color(o_line.color_at(j));
auto width = fish_wcwidth_visible(o_line.char_at(j)); auto width = fish_wcwidth_visible(o_line.char_at(j));
s_write_char(scr, o_line.char_at(j), width); this->write_char(o_line.char_at(j), width);
current_width += width; current_width += width;
} }
@ -907,7 +893,7 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
clear_remainder = false; clear_remainder = false;
} else if (need_clear_lines && current_width < screen_width) { } else if (need_clear_lines && current_width < screen_width) {
clear_remainder = true; clear_remainder = true;
} else if (right_prompt_width < scr->last_right_prompt_width) { } else if (right_prompt_width < this->last_right_prompt_width) {
clear_remainder = true; clear_remainder = true;
} else { } else {
// This wcswidth shows up strong in the profile. // This wcswidth shows up strong in the profile.
@ -920,19 +906,19 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
} }
if (clear_remainder && clr_eol) { if (clear_remainder && clr_eol) {
set_color(highlight_spec_t{}); set_color(highlight_spec_t{});
s_move(scr, current_width, static_cast<int>(i)); this->move(current_width, static_cast<int>(i));
s_write_mbs(scr, clr_eol); this->write_mbs(clr_eol);
} }
// Output any rprompt if this is the first line. // Output any rprompt if this is the first line.
if (i == 0 && right_prompt_width > 0) { //!OCLINT(Use early exit/continue) if (i == 0 && right_prompt_width > 0) { //!OCLINT(Use early exit/continue)
// Move the cursor to the beginning of the line first to be independent of the width. // Move the cursor to the beginning of the line first to be independent of the width.
// This helps prevent staircase effects if fish and the terminal disagree. // This helps prevent staircase effects if fish and the terminal disagree.
s_move(scr, 0, 0); this->move(0, 0);
s_move(scr, static_cast<int>(screen_width - right_prompt_width), static_cast<int>(i)); this->move(static_cast<int>(screen_width - right_prompt_width), static_cast<int>(i));
set_color(highlight_spec_t{}); set_color(highlight_spec_t{});
s_write_str(scr, right_prompt); this->write_str(right_prompt);
scr->actual.cursor.x += right_prompt_width; this->actual.cursor.x += right_prompt_width;
// We output in the last column. Some terms (Linux) push the cursor further right, past // We output in the last column. Some terms (Linux) push the cursor further right, past
// the window. Others make it "stick." Since we don't really know which is which, issue // the window. Others make it "stick." Since we don't really know which is which, issue
@ -942,33 +928,33 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
// wrapped. If so, then a cr will go to the beginning of the following line! So instead // wrapped. If so, then a cr will go to the beginning of the following line! So instead
// issue a bunch of "move left" commands to get back onto the line, and then jump to the // issue a bunch of "move left" commands to get back onto the line, and then jump to the
// front of it. // front of it.
s_move(scr, scr->actual.cursor.x - static_cast<int>(right_prompt_width), this->move(this->actual.cursor.x - static_cast<int>(right_prompt_width),
scr->actual.cursor.y); this->actual.cursor.y);
s_write_str(scr, L"\r"); this->write_str(L"\r");
scr->actual.cursor.x = 0; this->actual.cursor.x = 0;
} }
} }
// Also move the cursor to the beginning of the line here, // Also move the cursor to the beginning of the line here,
// in case we're wrong about the width anywhere. // in case we're wrong about the width anywhere.
s_move(scr, 0, 0); this->move(0, 0);
// Clear remaining lines (if any) if we haven't cleared the screen. // Clear remaining lines (if any) if we haven't cleared the screen.
if (!has_cleared_screen && need_clear_screen && clr_eol) { if (!has_cleared_screen && need_clear_screen && clr_eol) {
set_color(highlight_spec_t{}); set_color(highlight_spec_t{});
for (size_t i = scr->desired.line_count(); i < lines_with_stuff; i++) { for (size_t i = this->desired.line_count(); i < lines_with_stuff; i++) {
s_move(scr, 0, static_cast<int>(i)); this->move(0, static_cast<int>(i));
s_write_mbs(scr, clr_eol); this->write_mbs(clr_eol);
} }
} }
s_move(scr, scr->desired.cursor.x, scr->desired.cursor.y); this->move(this->desired.cursor.x, this->desired.cursor.y);
set_color(highlight_spec_t{}); set_color(highlight_spec_t{});
// We have now synced our actual screen against our desired screen. Note that this is a big // We have now synced our actual screen against our desired screen. Note that this is a big
// assignment! // assignment!
scr->actual = scr->desired; this->actual = this->desired;
scr->last_right_prompt_width = right_prompt_width; this->last_right_prompt_width = right_prompt_width;
} }
/// Returns true if we are using a dumb terminal. /// Returns true if we are using a dumb terminal.
@ -1156,11 +1142,11 @@ static screen_layout_t compute_layout(screen_t *s, size_t screen_width,
return result; return result;
} }
void s_write(screen_t *s, const wcstring &left_prompt, const wcstring &right_prompt, void screen_t::write(const wcstring &left_prompt, const wcstring &right_prompt,
const wcstring &commandline, size_t explicit_len, const wcstring &commandline, size_t explicit_len,
const std::vector<highlight_spec_t> &colors, const std::vector<int> &indent, const std::vector<highlight_spec_t> &colors, const std::vector<int> &indent,
size_t cursor_pos, pager_t &pager, page_rendering_t &page_rendering, size_t cursor_pos, pager_t &pager, page_rendering_t &page_rendering,
bool cursor_is_within_pager) { bool cursor_is_within_pager) {
termsize_t curr_termsize = termsize_last(); termsize_t curr_termsize = termsize_last();
int screen_width = curr_termsize.width; int screen_width = curr_termsize.width;
static relaxed_atomic_t<uint32_t> s_repaints{0}; static relaxed_atomic_t<uint32_t> s_repaints{0};
@ -1184,7 +1170,7 @@ void s_write(screen_t *s, const wcstring &left_prompt, const wcstring &right_pro
return; return;
} }
s_check_status(s); this->check_status();
// Completely ignore impossibly small screens. // Completely ignore impossibly small screens.
if (screen_width < 4) { if (screen_width < 4) {
@ -1192,21 +1178,21 @@ void s_write(screen_t *s, const wcstring &left_prompt, const wcstring &right_pro
} }
// Compute a layout. // Compute a layout.
const screen_layout_t layout = compute_layout(s, screen_width, left_prompt, right_prompt, const screen_layout_t layout = compute_layout(this, screen_width, left_prompt, right_prompt,
explicit_command_line, autosuggestion); explicit_command_line, autosuggestion);
// Determine whether, if we have an autosuggestion, it was truncated. // Determine whether, if we have an autosuggestion, it was truncated.
s->autosuggestion_is_truncated = this->autosuggestion_is_truncated =
!autosuggestion.empty() && autosuggestion != layout.autosuggestion; !autosuggestion.empty() && autosuggestion != layout.autosuggestion;
// Clear the desired screen and set its width. // Clear the desired screen and set its width.
s->desired.screen_width = screen_width; this->desired.screen_width = screen_width;
s->desired.resize(0); this->desired.resize(0);
s->desired.cursor.x = s->desired.cursor.y = 0; this->desired.cursor.x = this->desired.cursor.y = 0;
// Append spaces for the left prompt. // Append spaces for the left prompt.
for (size_t i = 0; i < layout.left_prompt_space; i++) { for (size_t i = 0; i < layout.left_prompt_space; i++) {
s_desired_append_char(s, L' ', highlight_spec_t{}, 0, layout.left_prompt_space, 1); desired_append_char(L' ', highlight_spec_t{}, 0, layout.left_prompt_space, 1);
} }
// If overflowing, give the prompt its own line to improve the situation. // If overflowing, give the prompt its own line to improve the situation.
@ -1220,25 +1206,25 @@ void s_write(screen_t *s, const wcstring &left_prompt, const wcstring &right_pro
for (i = 0; i < effective_commandline.size(); i++) { for (i = 0; i < effective_commandline.size(); i++) {
// Grab the current cursor's x,y position if this character matches the cursor's offset. // Grab the current cursor's x,y position if this character matches the cursor's offset.
if (!cursor_is_within_pager && i == cursor_pos) { if (!cursor_is_within_pager && i == cursor_pos) {
cursor_arr = s->desired.cursor; cursor_arr = this->desired.cursor;
} }
s_desired_append_char(s, effective_commandline.at(i), colors[i], indent[i], desired_append_char(effective_commandline.at(i), colors[i], indent[i],
first_line_prompt_space, first_line_prompt_space,
fish_wcwidth_visible(effective_commandline.at(i))); fish_wcwidth_visible(effective_commandline.at(i)));
} }
// Cursor may have been at the end too. // Cursor may have been at the end too.
if (!cursor_is_within_pager && i == cursor_pos) { if (!cursor_is_within_pager && i == cursor_pos) {
cursor_arr = s->desired.cursor; cursor_arr = this->desired.cursor;
} }
// Now that we've output everything, set the cursor to the position that we saved in the loop // Now that we've output everything, set the cursor to the position that we saved in the loop
// above. // above.
s->desired.cursor = cursor_arr; this->desired.cursor = cursor_arr;
if (cursor_is_within_pager) { if (cursor_is_within_pager) {
s->desired.cursor.x = static_cast<int>(cursor_pos); this->desired.cursor.x = static_cast<int>(cursor_pos);
s->desired.cursor.y = static_cast<int>(s->desired.line_count()); this->desired.cursor.y = static_cast<int>(this->desired.line_count());
} }
// Re-render our completions page if necessary. Limit the term size of the pager to the true // Re-render our completions page if necessary. Limit the term size of the pager to the true
@ -1248,48 +1234,45 @@ void s_write(screen_t *s, const wcstring &left_prompt, const wcstring &right_pro
std::max(1, curr_termsize.height - full_line_count)}); std::max(1, curr_termsize.height - full_line_count)});
pager.update_rendering(&page_rendering); pager.update_rendering(&page_rendering);
// Append pager_data (none if empty). // Append pager_data (none if empty).
s->desired.append_lines(page_rendering.screen_data); this->desired.append_lines(page_rendering.screen_data);
s_update(s, layout.left_prompt, layout.right_prompt); this->update(layout.left_prompt, layout.right_prompt);
s_save_status(s); this->save_status();
} }
void s_reset_line(screen_t *s, bool repaint_prompt) { void screen_t::reset_line(bool repaint_prompt) {
assert(s && "Null screen");
// Remember how many lines we had output to, so we can clear the remaining lines in the next // Remember how many lines we had output to, so we can clear the remaining lines in the next
// call to s_update. This prevents leaving junk underneath the cursor when resizing a window // call to s_update. This prevents leaving junk underneath the cursor when resizing a window
// wider such that it reduces our desired line count. // wider such that it reduces our desired line count.
s->actual_lines_before_reset = std::max(s->actual_lines_before_reset, s->actual.line_count()); this->actual_lines_before_reset =
std::max(this->actual_lines_before_reset, this->actual.line_count());
if (repaint_prompt) { if (repaint_prompt) {
// If the prompt is multi-line, we need to move up to the prompt's initial line. We do this // If the prompt is multi-line, we need to move up to the prompt's initial line. We do this
// by lying to ourselves and claiming that we're really below what we consider "line 0" // by lying to ourselves and claiming that we're really below what we consider "line 0"
// (which is the last line of the prompt). This will cause us to move up to try to get back // (which is the last line of the prompt). This will cause us to move up to try to get back
// to line 0, but really we're getting back to the initial line of the prompt. // to line 0, but really we're getting back to the initial line of the prompt.
const size_t prompt_line_count = calc_prompt_lines(s->actual_left_prompt); const size_t prompt_line_count = calc_prompt_lines(this->actual_left_prompt);
assert(prompt_line_count >= 1); assert(prompt_line_count >= 1);
s->actual.cursor.y += (prompt_line_count - 1); this->actual.cursor.y += (prompt_line_count - 1);
s->actual_left_prompt.clear(); this->actual_left_prompt.clear();
} }
s->actual.resize(0); this->actual.resize(0);
s->need_clear_lines = true; this->need_clear_lines = true;
// This should prevent resetting the cursor position during the next repaint. // This should prevent resetting the cursor position during the next repaint.
write_loop(STDOUT_FILENO, "\r", 1); write_loop(STDOUT_FILENO, "\r", 1);
s->actual.cursor.x = 0; this->actual.cursor.x = 0;
fstat(STDOUT_FILENO, &s->prev_buff_1); fstat(STDOUT_FILENO, &this->prev_buff_1);
fstat(STDERR_FILENO, &s->prev_buff_2); fstat(STDERR_FILENO, &this->prev_buff_2);
} }
void s_reset_abandoning_line(screen_t *s, int screen_width) { void screen_t::reset_abandoning_line(int screen_width) {
assert(s && "Null screen"); this->actual.cursor.y = 0;
this->actual.resize(0);
s->actual.cursor.y = 0; this->actual_left_prompt.clear();
s->actual.resize(0); this->need_clear_lines = true;
s->actual_left_prompt.clear();
s->need_clear_lines = true;
// Do the PROMPT_SP hack. // Do the PROMPT_SP hack.
wcstring abandon_line_string; wcstring abandon_line_string;
@ -1358,10 +1341,10 @@ void s_reset_abandoning_line(screen_t *s, int screen_width) {
const std::string narrow_abandon_line_string = wcs2string(abandon_line_string); const std::string narrow_abandon_line_string = wcs2string(abandon_line_string);
write_loop(STDOUT_FILENO, narrow_abandon_line_string.c_str(), write_loop(STDOUT_FILENO, narrow_abandon_line_string.c_str(),
narrow_abandon_line_string.size()); narrow_abandon_line_string.size());
s->actual.cursor.x = 0; this->actual.cursor.x = 0;
fstat(STDOUT_FILENO, &s->prev_buff_1); fstat(STDOUT_FILENO, &this->prev_buff_1);
fstat(STDERR_FILENO, &s->prev_buff_2); fstat(STDERR_FILENO, &this->prev_buff_2);
} }
void screen_force_clear_to_end() { void screen_force_clear_to_end() {

115
src/screen.h
View file

@ -136,6 +136,76 @@ class screen_t {
public: public:
screen_t(); screen_t();
/// This is the main function for the screen output library. It is used to define the desired
/// contents of the screen. The screen command will use its knowledge of the current contents of
/// the screen in order to render the desired output using as few terminal commands as possible.
///
/// \param left_prompt the prompt to prepend to the command line
/// \param right_prompt the right prompt, or NULL if none
/// \param commandline the command line
/// \param explicit_len the number of characters of the "explicit" (non-autosuggestion) portion
/// of the command line \param colors the colors to use for the comand line \param indent the
/// indent to use for the command line \param cursor_pos where the cursor is \param pager the
/// pager to render below the command line \param page_rendering to cache the current pager view
/// \param cursor_is_within_pager whether the position is within the pager line (first line)
void write(const wcstring &left_prompt, const wcstring &right_prompt,
const wcstring &commandline, size_t explicit_len,
const std::vector<highlight_spec_t> &colors, const std::vector<int> &indent,
size_t cursor_pos, pager_t &pager, page_rendering_t &page_rendering,
bool cursor_is_within_pager);
/// Resets the screen buffer's internal knowledge about the contents of the screen,
/// optionally repainting the prompt as well.
/// This function assumes that the current line is still valid.
void reset_line(bool repaint_prompt = false);
/// Resets the screen buffer's internal knowldge about the contents of the screen,
/// abandoning the current line and going to the next line.
/// If clear_to_eos is set,
/// The screen width must be provided for the PROMPT_SP hack.
void reset_abandoning_line(int screen_width);
/// Stat stdout and stderr and save result as the current timestamp.
/// This is used to avoid reacting to changes that we ourselves made to the screen.
void save_status();
/// \return whether we believe the cursor is wrapped onto the last line, and that line is
/// otherwise empty. This includes both soft and hard wrapping.
bool cursor_is_wrapped_to_own_line() const;
/// Whether the last-drawn autosuggestion (if any) is truncated, or hidden entirely.
bool autosuggestion_is_truncated{false};
private:
/// Appends a character to the end of the line that the output cursor is on. This function
/// automatically handles linebreaks and lines longer than the screen width.
void desired_append_char(wchar_t b, highlight_spec_t c, int indent, size_t prompt_width,
size_t bwidth);
/// Stat stdout and stderr and compare result to previous result in reader_save_status. Repaint
/// if modification time has changed.
void check_status();
/// Write the bytes needed to move screen cursor to the specified position to the specified
/// buffer. The actual_cursor field of the specified screen_t will be updated.
///
/// \param new_x the new x position
/// \param new_y the new y position
void move(int new_x, int new_y);
/// Convert a wide character to a multibyte string and append it to the buffer.
void write_char(wchar_t c, size_t width);
/// Send the specified string through tputs and append the output to the screen's outputter.
void write_mbs(const char *s);
/// Convert a wide string to a multibyte string and append it to the buffer.
void write_str(const wchar_t *s);
void write_str(const wcstring &s);
/// Update the cursor as if soft wrapping had been performed.
bool handle_soft_wrap(int x, int y);
/// The internal representation of the desired screen contents. /// The internal representation of the desired screen contents.
screen_data_t desired{}; screen_data_t desired{};
/// The internal representation of the actual screen contents. /// The internal representation of the actual screen contents.
@ -146,8 +216,6 @@ class screen_t {
size_t last_right_prompt_width{0}; size_t last_right_prompt_width{0};
/// If we support soft wrapping, we can output to this location without any cursor motion. /// If we support soft wrapping, we can output to this location without any cursor motion.
maybe_t<screen_data_t::cursor_t> soft_wrap_location{}; maybe_t<screen_data_t::cursor_t> soft_wrap_location{};
/// Whether the last-drawn autosuggestion (if any) is truncated, or hidden entirely.
bool autosuggestion_is_truncated{false};
/// This flag is set to true when there is reason to suspect that the parts of the screen lines /// This flag is set to true when there is reason to suspect that the parts of the screen lines
/// where the actual content is not filled in may be non-empty. This means that a clr_eol /// where the actual content is not filled in may be non-empty. This means that a clr_eol
/// command has to be sent to the terminal at the end of each line, including /// command has to be sent to the terminal at the end of each line, including
@ -167,47 +235,12 @@ class screen_t {
/// \return the outputter for this screen. /// \return the outputter for this screen.
outputter_t &outp() { return outp_; } outputter_t &outp() { return outp_; }
/// \return whether we believe the cursor is wrapped onto the last line, and that line is /// Update the screen to match the desired output.
/// otherwise empty. This includes both soft and hard wrapping. void update(const wcstring &left_prompt, const wcstring &right_prompt);
bool cursor_is_wrapped_to_own_line() const;
class scoped_buffer_t;
}; };
/// This is the main function for the screen putput library. It is used to define the desired
/// contents of the screen. The screen command will use its knowledge of the current contents of the
/// screen in order to render the desired output using as few terminal commands as possible.
///
/// \param s the screen on which to write
/// \param left_prompt the prompt to prepend to the command line
/// \param right_prompt the right prompt, or NULL if none
/// \param commandline the command line
/// \param explicit_len the number of characters of the "explicit" (non-autosuggestion) portion of
/// the command line
/// \param colors the colors to use for the comand line
/// \param indent the indent to use for the command line
/// \param cursor_pos where the cursor is
/// \param pager the pager to render below the command line
/// \param page_rendering to cache the current pager view
/// \param cursor_is_within_pager whether the position is within the pager line (first line)
void s_write(screen_t *s, const wcstring &left_prompt, const wcstring &right_prompt,
const wcstring &commandline, size_t explicit_len,
const std::vector<highlight_spec_t> &colors, const std::vector<int> &indent,
size_t cursor_pos, pager_t &pager, page_rendering_t &page_rendering,
bool cursor_is_within_pager);
/// Resets the screen buffer's internal knowledge about the contents of the screen,
/// optionally repainting the prompt as well.
/// This function assumes that the current line is still valid.
void s_reset_line(screen_t *s, bool repaint_prompt = false);
/// Resets the screen buffer's internal knowldge about the contents of the screen,
/// abandoning the current line and going to the next line.
/// If clear_to_eos is set,
/// The screen width must be provided for the PROMPT_SP hack.
void s_reset_abandoning_line(screen_t *s, int screen_width);
/// Stat stdout and stderr and save result as the current timestamp.
void s_save_status(screen_t *s);
/// Issues an immediate clr_eos. /// Issues an immediate clr_eos.
void screen_force_clear_to_end(); void screen_force_clear_to_end();