Use insert/remove lines escapes to reduce terminal traffic

Diff against known state and insert/erase relevant lines.

Erase everything first to avoid insertion invalidating lines that
get out of the terminal at bottom.
This commit is contained in:
Maxime Coste 2020-02-18 22:54:46 +11:00
parent 9e8f555a82
commit 5466f63eeb

View File

@ -7,6 +7,7 @@
#include "keys.hh"
#include "ranges.hh"
#include "string_utils.hh"
#include "diff.hh"
#include <algorithm>
@ -187,29 +188,46 @@ void TerminalUI::Screen::output(bool force)
}
};
DisplayCoord cursor_pos = pos;
for (auto& line : lines)
struct Add { int pos; int len; };
Vector<Add> adds;
auto new_hashes = lines | transform([](auto& line) { return hash_value(line.atoms); }) | gather<Vector>();
for_each_diff(hashes.begin(), hashes.size(),
new_hashes.begin(), new_hashes.size(),
[&, line=0, posB=0](DiffOp op, int len) mutable {
switch (op)
{
auto line_hash = hash_value(line.atoms);
if (force or cursor_pos.line >= hashes.size() or
line_hash != hashes[(size_t)cursor_pos.line])
case DiffOp::Keep:
line += len;
posB += len;
break;
case DiffOp::Add:
adds.push_back({posB, len});
posB += len;
break;
case DiffOp::Remove:
printf("\033[%dH\033[%dM", line+1, len);
break;
}
});
hashes = std::move(new_hashes);
for (auto& add : adds)
{
set_cursor_pos(cursor_pos);
for (auto& atom : line.atoms)
printf("\033[%dH\033[%dL", add.pos + 1, add.len);
for (int i = 0; i < add.len; ++i)
{
printf("\033[");
if (i != 0)
printf("\033[%dH", add.pos + i + 1);
for (auto& atom : lines[add.pos + i].atoms)
{
fputs("\033[", stdout);
set_attributes(atom.face.attributes);
set_color(true, atom.face.fg);
set_color(false, atom.face.bg);
printf("m");
fputs("m", stdout);
fputs(atom.text.c_str(), stdout);
}
}
if (hashes.size() <= cursor_pos.line)
hashes.push_back(line_hash);
else
hashes[(size_t)cursor_pos.line] = line_hash;
++cursor_pos.line;
}
}