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Add comments explaining the OSC 133 output range search.

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This commit is contained in:
Michael Grant
2026-10-07 15:15:00 +02:00
parent 1f892a3f71
commit 833d3dc0fa
3 changed files with 23 additions and 2 deletions
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20
grid-reader.c
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@@ -474,6 +474,7 @@ grid_reader_previous_output_range(struct grid_reader *gr, u_int *sx,
for (y = 0; y < total && y <= cursor_y; y++) {
gl = grid_get_line(gd, y);
od = &gl->osc133_data;
/* On the cursor's line, ignore markers after the cursor. */
has_start = has_end = end_first = 0;
if (gl->flags & GRID_LINE_START_OUTPUT) {
if (y != cursor_y || od->out_start_col <= cursor_x)
@@ -486,6 +487,7 @@ grid_reader_previous_output_range(struct grid_reader *gr, u_int *sx,
/* An end before the start ends the previous output. */
if (has_start && has_end && od->out_end_col < od->out_start_col)
end_first = 1;
/* A C marker starts an output that is pending until its D. */
if (has_start && !end_first) {
start_x = od->out_start_col;
start_y = y;
@@ -503,6 +505,7 @@ grid_reader_previous_output_range(struct grid_reader *gr, u_int *sx,
pending = 1;
}
}
/* A D marker completes the pending output. */
if (pending && has_end) {
*sx = start_x;
*sy = start_y;
@@ -517,7 +520,7 @@ grid_reader_previous_output_range(struct grid_reader *gr, u_int *sx,
pending = 1;
}
if (gl->flags & GRID_LINE_START_PROMPT) {
/* Output may start after the prompt. */
/* A prompt drops an unfinished output. */
if (!has_start || od->out_start_col < od->prompt_col)
pending = 0;
have_prompt = 1;
@@ -526,7 +529,11 @@ grid_reader_previous_output_range(struct grid_reader *gr, u_int *sx,
return (found);
}
/* Find the output range for the command at the cursor. */
/*
* Find the output range for the command at the cursor, from its C marker to
* its D marker. If the prompt has no output yet, use the previous output.
* Returns 0 if there is no usable range.
*/
int
grid_reader_output_range(struct grid_reader *gr, u_int *sx, u_int *sy,
u_int *ex, u_int *ey)
@@ -543,6 +550,7 @@ grid_reader_output_range(struct grid_reader *gr, u_int *sx, u_int *sy,
log_debug("%s: cursor at %u,%u", __func__, cursor_x, cursor_y);
/* Find the last prompt at or before the cursor. */
total = gd->hsize + gd->sy;
for (y = 0; y < total; y++) {
gl = grid_get_line(gd, y);
@@ -556,6 +564,7 @@ grid_reader_output_range(struct grid_reader *gr, u_int *sx, u_int *sy,
prompt_y = y;
prompt_x = od->prompt_col;
}
/* With no prompt, its A marker may have left history, so start at 0. */
if (prompt_y == UINT_MAX) {
log_debug("%s: no osc133 prompt before cursor", __func__);
y = 0;
@@ -565,6 +574,7 @@ grid_reader_output_range(struct grid_reader *gr, u_int *sx, u_int *sy,
y = prompt_y;
}
/* Walk down from the prompt to its C and D, up to the next prompt. */
for (; y < total; y++) {
gl = grid_get_line(gd, y);
od = &gl->osc133_data;
@@ -608,11 +618,17 @@ grid_reader_output_range(struct grid_reader *gr, u_int *sx, u_int *sy,
if (next_prompt)
break;
}
/* The cursor is on a prompt with no output yet. */
if (!found_start) {
log_debug("%s: no output after prompt", __func__);
found = grid_reader_previous_output_range(gr, sx, sy, ex, ey);
return (found);
}
/*
* Without a D marker the command is still running, so its output runs
* to the last used line. If the next prompt came first, it has no
* usable end.
*/
if (!found_end) {
if (y != total) {
log_debug("%s: output interrupted by next prompt",