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Add detailed migration plan for PieceTable-based buffer architecture.

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- Created `piece-table-migration.md` outlining the steps to transition from GapBuffer to a unified PieceTable architecture.
- Included phased approach: extending PieceTable, Buffer adapter layer, command updates, and renderer changes.
- Detailed API changes, file updates, testing strategy, risk assessment, and timeline for each migration phase.
- Document serves as a reference for architecture goals and implementation details.
This commit is contained in:
Kyle Isom
2025-12-05 20:21:33 -08:00
parent 71c1c9e50b
commit 3f4c60d311
10 changed files with 3608 additions and 219 deletions
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162
TerminalInputHandler.cc
View File

@@ -29,89 +29,95 @@ map_key_to_command(const int ch,
// Handle special keys from ncurses
// These keys exit k-prefix mode if active (user pressed C-k then a special key).
switch (ch) {
case KEY_MOUSE: {
k_prefix = false;
k_ctrl_pending = false;
MEVENT ev{};
if (getmouse(&ev) == OK) {
// Mouse wheel → scroll viewport without moving cursor
case KEY_ENTER:
// Some terminals send KEY_ENTER distinct from '\n'/'\r'
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::Newline, "", 0};
return true;
case KEY_MOUSE: {
k_prefix = false;
k_ctrl_pending = false;
MEVENT ev{};
if (getmouse(&ev) == OK) {
// Mouse wheel → scroll viewport without moving cursor
#ifdef BUTTON4_PRESSED
if (ev.bstate & (BUTTON4_PRESSED | BUTTON4_RELEASED | BUTTON4_CLICKED)) {
out = {true, CommandId::ScrollUp, "", 0};
return true;
}
if (ev.bstate & (BUTTON4_PRESSED | BUTTON4_RELEASED | BUTTON4_CLICKED)) {
out = {true, CommandId::ScrollUp, "", 0};
return true;
}
#endif
#ifdef BUTTON5_PRESSED
if (ev.bstate & (BUTTON5_PRESSED | BUTTON5_RELEASED | BUTTON5_CLICKED)) {
out = {true, CommandId::ScrollDown, "", 0};
return true;
}
#endif
// React to left button click/press
if (ev.bstate & (BUTTON1_CLICKED | BUTTON1_PRESSED | BUTTON1_RELEASED)) {
char buf[64];
// Use screen coordinates; command handler will translate via offsets
std::snprintf(buf, sizeof(buf), "@%d:%d", ev.y, ev.x);
out = {true, CommandId::MoveCursorTo, std::string(buf), 0};
return true;
}
if (ev.bstate & (BUTTON5_PRESSED | BUTTON5_RELEASED | BUTTON5_CLICKED)) {
out = {true, CommandId::ScrollDown, "", 0};
return true;
}
#endif
// React to left button click/press
if (ev.bstate & (BUTTON1_CLICKED | BUTTON1_PRESSED | BUTTON1_RELEASED)) {
char buf[64];
// Use screen coordinates; command handler will translate via offsets
std::snprintf(buf, sizeof(buf), "@%d:%d", ev.y, ev.x);
out = {true, CommandId::MoveCursorTo, std::string(buf), 0};
return true;
}
// No actionable mouse event
out.hasCommand = false;
return true;
}
case KEY_LEFT:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveLeft, "", 0};
return true;
case KEY_RIGHT:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveRight, "", 0};
return true;
case KEY_UP:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveUp, "", 0};
return true;
case KEY_DOWN:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveDown, "", 0};
return true;
case KEY_HOME:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveHome, "", 0};
return true;
case KEY_END:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveEnd, "", 0};
return true;
case KEY_PPAGE:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::PageUp, "", 0};
return true;
case KEY_NPAGE:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::PageDown, "", 0};
return true;
case KEY_DC:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::DeleteChar, "", 0};
return true;
case KEY_RESIZE:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::Refresh, "", 0};
return true;
default:
break;
// No actionable mouse event
out.hasCommand = false;
return true;
}
case KEY_LEFT:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveLeft, "", 0};
return true;
case KEY_RIGHT:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveRight, "", 0};
return true;
case KEY_UP:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveUp, "", 0};
return true;
case KEY_DOWN:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveDown, "", 0};
return true;
case KEY_HOME:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveHome, "", 0};
return true;
case KEY_END:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::MoveEnd, "", 0};
return true;
case KEY_PPAGE:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::PageUp, "", 0};
return true;
case KEY_NPAGE:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::PageDown, "", 0};
return true;
case KEY_DC:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::DeleteChar, "", 0};
return true;
case KEY_RESIZE:
k_prefix = false;
k_ctrl_pending = false;
out = {true, CommandId::Refresh, "", 0};
return true;
default:
break;
}
// ESC as cancel of prefix; many terminals send meta sequences as ESC+...