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:(before "End Primitive Recipe Declarations")
_BROWSE_TRACE,
:(before "End Primitive Recipe Numbers")
Recipe_number["$browse-trace"] = _BROWSE_TRACE;
:(before "End Primitive Recipe Implementations")
case _BROWSE_TRACE: {
start_trace_browser();
break;
}
:(before "End Globals")
set<long long int> Visible;
long long int Top_of_screen = 0;
long long int Last_printed_row = 0;
map<int, long long int> Trace_index; // screen row -> trace index
:(code)
void start_trace_browser() {
if (!Trace_stream) return;
cerr << "computing depth to display\n";
long long int min_depth = 9999;
for (long long int i = 0; i < SIZE(Trace_stream->past_lines); ++i) {
trace_line& curr_line = Trace_stream->past_lines.at(i);
if (curr_line.depth == 0) continue;
if (curr_line.depth < min_depth) min_depth = curr_line.depth;
}
cerr << "depth is " << min_depth << '\n';
cerr << "computing lines to display\n";
for (long long int i = 0; i < SIZE(Trace_stream->past_lines); ++i) {
if (Trace_stream->past_lines.at(i).depth == min_depth)
Visible.insert(i);
}
tb_init();
Display_row = Display_column = 0;
struct tb_event event;
Top_of_screen = 0;
refresh_screen_rows();
while (true) {
render();
do {
tb_poll_event(&event);
} while (event.type != TB_EVENT_KEY);
long long int key = event.key ? event.key : event.ch;
if (key == 'q' || key == 'Q') break;
if (key == 'j' || key == 'J') {
if (Display_row < Last_printed_row) ++Display_row;
}
if (key == 'k' || key == 'K') {
if (Display_row > 0) --Display_row;
}
}
tb_shutdown();
}
// update Trace_indices for each screen_row on the basis of Top_of_screen and Visible
void refresh_screen_rows() {
long long int screen_row = 0, index = 0;
Trace_index.clear();
for (screen_row = 0, index = Top_of_screen; screen_row < tb_height() && index < SIZE(Trace_stream->past_lines); ++screen_row, ++index) {
// skip lines without depth for now
while (Visible.find(index) == Visible.end()) {
++index;
if (index >= SIZE(Trace_stream->past_lines)) goto done;
}
assert(index < SIZE(Trace_stream->past_lines));
Trace_index[screen_row] = index;
}
done:;
}
void render() {
long long int screen_row = 0;
for (screen_row = 0; screen_row < tb_height(); ++screen_row) {
if (Trace_index.find(screen_row) == Trace_index.end()) break;
trace_line& curr_line = Trace_stream->past_lines.at(Trace_index[screen_row]);
ostringstream out;
out << std::setw(4) << curr_line.depth << ' ' << curr_line.label << ": " << curr_line.contents;
render_line(screen_row, out.str());
}
// clear rest of screen
Last_printed_row = screen_row-1;
for (; screen_row < tb_height(); ++screen_row) {
render_line(screen_row, "~");
}
// move cursor back to display row at the end
tb_set_cursor(0, Display_row);
tb_present();
}
void render_line(int screen_row, const string& s) {
long long int col = 0;
for (col = 0; col < tb_width() && col < SIZE(s); ++col) {
char c = s.at(col);
if (c == '\n') c = ';'; // replace newlines with semi-colons
tb_change_cell(col, screen_row, c, TB_WHITE, TB_DEFAULT);
}
for (; col < tb_width(); ++col) {
tb_change_cell(col, screen_row, ' ', TB_WHITE, TB_DEFAULT);
}
}
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