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src/screen: Skip a wcswidth

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This stops trying to see if the previous line is wider if it is a
prefix of the current one.

Which turns out to be true often enough that it's a net benefit.
This commit is contained in:
Fabian Homborg 2019-05-11 10:25:27 +02:00
parent ac983f6c4b
commit 4462f6d600
1 changed files with 8 additions and 4 deletions
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12
src/screen.cpp
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@ -654,11 +654,11 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
// Note that skip_remaining is a width, not a character count.
size_t skip_remaining = start_pos;
const size_t shared_prefix = line_shared_prefix(o_line, s_line);
if (!should_clear_screen_this_line) {
// Compute how much we should skip. At a minimum we skip over the prompt. But also skip
// over the shared prefix of what we want to output now, and what we output before, to
// avoid repeatedly outputting it.
const size_t shared_prefix = line_shared_prefix(o_line, s_line);
if (shared_prefix > 0) {
size_t prefix_width = fish_wcswidth(&o_line.text.at(0), shared_prefix);
if (prefix_width > skip_remaining) skip_remaining = prefix_width;
@ -734,9 +734,13 @@ static void s_update(screen_t *scr, const wcstring &left_prompt, const wcstring
} else if (right_prompt_width < scr->last_right_prompt_width) {
clear_remainder = true;
} else {
int prev_width =
s_line.text.empty() ? 0 : fish_wcswidth(&s_line.text.at(0), s_line.text.size());
clear_remainder = prev_width > current_width;
// This wcswidth shows up strong in the profile.
// Only do it if the previous line could conceivably be wider.
// That means if it is a prefix of the current one we can skip it.
if (s_line.text.size() != shared_prefix) {
int prev_width = fish_wcswidth(&s_line.text.at(0), s_line.text.size());
clear_remainder = prev_width > current_width;
}
}
if (clear_remainder && clr_eol) {
s_set_color(scr, vars, highlight_spec_t{});