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Merge pull request #362 from jamesragray/accurateCursorPos 

Attempt to track cursor more accurately by caching widths of grapheme's
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Adam D. Ruppe 2023-02-23 16:05:28 -05:00 committed by GitHub
parent e0eb6808be 2b35882926
commit cc416c9848
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1 changed files with 88 additions and 39 deletions
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127
terminal.d
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@ -2158,7 +2158,10 @@ http://msdn.microsoft.com/en-us/library/windows/desktop/ms683193%28v=vs.85%29.as
void writeln(T...)(T t) {
write(t, "\n");
}
import std.uni;
int[Grapheme] graphemeWidth;
bool willInsertFollowingLine = false;
bool uncertainIfAtEndOfLine = false;
/+
/// A combined moveTo and writef that puts the cursor back where it was before when it finishes the write.
/// Only works in cellular mode.
@ -2180,51 +2183,93 @@ http://msdn.microsoft.com/en-us/library/windows/desktop/ms683193%28v=vs.85%29.as
writeStringRaw(toWrite, ForceOption.alwaysSend);
}
+/
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;
void writePrintableString(const(char)[] s, ForceOption force = ForceOption.automatic) {
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..$];
}
}
void writePrintableString_(const(char)[] s, ForceOption force = ForceOption.automatic) {
// an escape character is going to mess things up. Actually any non-printable character could, but meh
// assert(s.indexOf("\033") == -1);
if(s.length == 0)
return;
// tracking cursor position
// FIXME: by grapheme?
foreach(dchar ch; s) {
switch(ch) {
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:
_cursorX++;
}
if(_wrapAround && _cursorX > width) {
_cursorX = 0;
_cursorY++;
}
if(_cursorY == height)
_cursorY--;
/+
auto index = getIndex(_cursorX, _cursorY);
if(data[index] != ch) {
data[index] = ch;
}
+/
}
version(TerminalDirectToEmulator) {
// this breaks up extremely long output a little as an aid to the
@ -2454,6 +2499,10 @@ http://msdn.microsoft.com/en-us/library/windows/desktop/ms683193%28v=vs.85%29.as
terminal._cursorY = terminal.tew.terminalEmulator.cursorY;
} else
updateCursorPosition_impl();
if(_cursorX == width) {
willInsertFollowingLine = true;
_cursorX--;
}
}
private void updateCursorPosition_impl() {
auto terminal = &this;