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update cursor position on-demand if it may have changed by a print since last time

This commit is contained in:
Adam D. Ruppe 2023-10-04 09:35:32 -04:00
parent eb45c8886d
commit 0ba0dc222e
1 changed files with 9 additions and 77 deletions
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86
terminal.d
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@ -1951,14 +1951,20 @@ http://msdn.microsoft.com/en-us/library/windows/desktop/ms683193%28v=vs.85%29.as
first to ask the terminal for its authoritative answer.
+/
@property int cursorX() {
if(cursorPositionDirty)
updateCursorPosition();
return _cursorX;
}
/// ditto
@property int cursorY() {
if(cursorPositionDirty)
updateCursorPosition();
return _cursorY;
}
private bool cursorPositionDirty = true;
private int _cursorX;
private int _cursorY;
@ -2247,83 +2253,8 @@ http://msdn.microsoft.com/en-us/library/windows/desktop/ms683193%28v=vs.85%29.as
}
+/
void writePrintableString(const(char)[] s, ForceOption force = ForceOption.automatic) {
while(s.length > 0) {
size_t index = 0;
import std.utf;
import std.uni;
import std.range;
bool written=false;
loop:
foreach(g; s.byDchar.byGrapheme) {
index += g[].byChar.walkLength;
if(uncertainIfAtEndOfLine) {
uncertainIfAtEndOfLine = false;
writePrintableString_(s[0..index],force);
written = true;
updateCursorPosition();
break;
}
if(willInsertFollowingLine) {
willInsertFollowingLine = false;
_cursorX = 0;
_cursorY++;
if(_cursorY >= height) { _cursorY--; }
}
switch(g[0]) {
case '\n':
_cursorX = 0;
_cursorY++;
break;
case '\r':
_cursorX = 0;
break;
case '\t':
// FIXME: get the actual tabstop, if possible
int diff = 8 - (_cursorX % 8);
if(diff == 0)
diff = 8;
_cursorX += diff;
break;
default:
if(auto ptr = g in graphemeWidth) {
_cursorX += *ptr;
if(_wrapAround) {
if(_cursorX == width) {
_cursorX--;
willInsertFollowingLine = true;
}
else if(cursorX > width) {
_cursorX = *ptr;
_cursorY++;
if(_cursorY == height)
_cursorY--;
}
}
}
else {
int x = _cursorX;
int y = _cursorY;
writePrintableString_(s[0..index],force);
written = true;
updateCursorPosition();
//FIXME: At some point it might be worthwhile to check if the next wrtie will wrap on those terminals that support it
//Note that: tmux (and screen?) seem to signal that the next write will wrap by reporting cursorX==width
if (_cursorX+1< width || _cursorX == width) {
graphemeWidth[g] = _cursorY > y
? _cursorX
: _cursorX - x;
if(_cursorX == width) { willInsertFollowingLine = true; }
}
else { uncertainIfAtEndOfLine = true; }
break loop;
}
}
}
if(!written) { writePrintableString_(s[0..index],force); }
s = s[index..$];
}
writePrintableString_(s, force);
cursorPositionDirty = true;
}
void writePrintableString_(const(char)[] s, ForceOption force = ForceOption.automatic) {
@ -2544,6 +2475,7 @@ http://msdn.microsoft.com/en-us/library/windows/desktop/ms683193%28v=vs.85%29.as
auto terminal = &this;
terminal.flush();
cursorPositionDirty = false;
// then get the current cursor position to start fresh
version(TerminalDirectToEmulator) {