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Add Emacs-style recentre-top-bottom, GitHub issue 5053 from sinyax75 at

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gmail dot com.
This commit is contained in:
nicm
2026-05-07 09:15:44 +00:00
parent 2d8aade74b
commit 962e565591
3 changed files with 79 additions and 2 deletions
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74
window-copy.c
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@@ -286,6 +286,13 @@ struct window_copy_mode_data {
SEL_LINE, /* select one line at a time */
} selflag;
enum {
RECENTRE_TOP,
RECENTRE_MIDDLE,
RECENTRE_BOTTOM,
} recentre_state;
u_int recentre_line;
const char *separators; /* word separators */
u_int dx; /* drag start position */
@@ -462,7 +469,7 @@ window_copy_init(struct window_mode_entry *wme,
struct screen *base = &wp->base;
struct screen_write_ctx ctx;
u_int i, cx, cy;
data = window_copy_common_init(wme);
data->backing = window_copy_clone_screen(base, &data->screen, &cx, &cy,
wme->swp != wme->wp);
@@ -497,6 +504,9 @@ window_copy_init(struct window_mode_entry *wme,
screen_size_x(&data->screen)), data->cy, 0);
screen_write_stop(&ctx);
data->recentre_state = RECENTRE_MIDDLE;
data->recentre_line = 0;
return (&data->screen);
}
@@ -2789,6 +2799,62 @@ window_copy_cmd_refresh_from_pane(struct window_copy_cmd_state *cs)
return (WINDOW_COPY_CMD_REDRAW);
}
static enum window_copy_cmd_action
window_copy_cmd_recentre_top_bottom(struct window_copy_cmd_state *cs)
{
struct window_mode_entry *wme = cs->wme;
struct window_copy_mode_data *data = wme->data;
u_int cy = data->cy, oy = data->oy;
u_int sy = screen_size_y(&data->screen) - 1;
u_int sm = sy / 2, backing_row;
enum { MIDDLE, TOP, BOTTOM } target;
backing_row = screen_hsize(data->backing) + cy - data->oy;
if (data->recentre_line != backing_row) {
data->recentre_state = RECENTRE_MIDDLE;
data->recentre_line = backing_row;
}
switch (data->recentre_state) {
case RECENTRE_MIDDLE:
data->recentre_state = RECENTRE_TOP;
target = MIDDLE;
break;
case RECENTRE_TOP:
data->recentre_state = RECENTRE_BOTTOM;
target = TOP;
break;
case RECENTRE_BOTTOM:
default:
data->recentre_state = RECENTRE_MIDDLE;
target = BOTTOM;
break;
}
oy = data->oy;
switch (target) {
case MIDDLE:
if (cy < sm)
window_copy_scroll_down(wme, sm - cy);
else if (cy > sm)
window_copy_scroll_up(wme, cy - sm);
if (data->oy != oy)
data->cy = cy + (data->oy - oy);
break;
case TOP:
window_copy_scroll_up(wme, cy);
data->cy = cy - (oy - data->oy);
break;
case BOTTOM:
window_copy_scroll_down(wme, sy - cy);
data->cy = cy + (data->oy - oy);
break;
}
window_copy_update_selection(wme, 0, 0);
return (WINDOW_COPY_CMD_REDRAW);
}
static const struct {
const char *command;
u_int minargs;
@@ -3173,6 +3239,12 @@ static const struct {
.clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
.f = window_copy_cmd_previous_word
},
{ .command = "recentre-top-bottom",
.args = { "", 0, 0, NULL },
.flags = WINDOW_COPY_CMD_FLAG_READONLY,
.clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
.f = window_copy_cmd_recentre_top_bottom
},
{ .command = "rectangle-on",
.args = { "", 0, 0, NULL },
.flags = 0,