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LibLine: Appropriately react to window size changes

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This commit is contained in:
AnotherTest 2020-04-10 09:53:22 +04:30 • committed by Andreas Kling
parent 1b422315fa
commit 2315f789cc
1 changed files with 43 additions and 21 deletions
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64
Libraries/LibLine/Editor.cpp
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@ -155,18 +155,9 @@ String Editor::get_line(const String& prompt)
if (!m_buffer.is_empty())
printf("^C");
}
if (m_was_resized) {
m_was_resized = false;
printf("\033[2K\r");
m_buffer.clear();
if (m_was_resized)
continue;
struct winsize ws;
int rc = ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
ASSERT(rc == 0);
m_num_columns = ws.ws_col;
return String::empty();
}
m_buffer.clear();
putchar('\n');
return String::empty();
@ -414,6 +405,36 @@ String Editor::get_line(const String& prompt)
void Editor::refresh_display()
{
auto cleanup = [&] {
vt_move_relative(0, m_pending_chars.size() - m_chars_inserted_in_the_middle);
auto current_line = cursor_line();
vt_clear_lines(current_line - 1, num_lines() - current_line);
vt_move_relative(-num_lines() + 1, -offset_in_line() - m_old_prompt_length + m_chars_inserted_in_the_middle);
};
auto has_cleaned_up = false;
// someone changed the window size, figure it out
// and react to it, we might need to redraw
if (m_was_resized) {
auto previous_num_columns = m_num_columns;
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0)
m_num_columns = 80;
else
m_num_columns = ws.ws_col;
if (previous_num_columns != m_num_columns) {
// we need to cleanup and redo everything
m_cached_prompt_valid = false;
m_refresh_needed = true;
swap(previous_num_columns, m_num_columns);
cleanup();
set_origin();
swap(previous_num_columns, m_num_columns);
has_cleaned_up = true;
}
}
// do not call hook on pure cursor movement
if (m_cached_prompt_valid && !m_refresh_needed && m_pending_chars.size() == 0) {
// probably just moving around
@ -442,13 +463,10 @@ void Editor::refresh_display()
// ouch, reflow entire line
// FIXME: handle multiline stuff
vt_move_relative(0, m_pending_chars.size() - m_chars_inserted_in_the_middle);
auto current_line = cursor_line();
vt_clear_lines(current_line - 1, num_lines() - current_line);
vt_move_relative(-num_lines() + 1, -offset_in_line() - m_old_prompt_length + m_chars_inserted_in_the_middle);
set_origin();
if (!has_cleaned_up) {
cleanup();
set_origin();
}
fputs(m_new_prompt.characters(), stdout);
@ -636,16 +654,20 @@ Vector<size_t, 2> Editor::vt_dsr()
do {
auto nread = read(0, buf + length, 16 - length);
if (nread < 0) {
if (errno == ESUCCESS) {
// ????
continue;
}
dbg() << "Error while reading DSR: " << strerror(errno);
return { 0, 0 };
return { 1, 1 };
}
if (nread == 0) {
dbg() << "Terminal DSR issue; received no response";
return { 0, 0 };
return { 1, 1 };
}
length += nread;
} while (buf[length - 1] != 'R' && length < 16);
size_t x { 0 }, y { 0 };
size_t x { 1 }, y { 1 };
if (buf[0] == '\033' && buf[1] == '[') {
auto parts = StringView(buf + 2, length - 3).split_view(';');