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When backspace is received at the beginning of a line and the previous line was

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wrapped, move the cursor back up to the end of the previous line.

Another one of the forgotten persons requested this quite a while ago (I need
to start noting names on todo items...) when it was quite hard to
implement. Now it is easy and I don't see it can do any harm, so hey presto...
This commit is contained in:
Nicholas Marriott 2009-10-12 16:59:55 +00:00
parent 693b3d03e6
commit 8608c6970d
3 changed files with 22 additions and 1 deletions
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2
input.c
View File

@ -646,7 +646,7 @@ input_handle_c0_control(u_char ch, struct input_ctx *ictx)
ictx->wp->window->flags |= WINDOW_BELL; ictx->wp->window->flags |= WINDOW_BELL;
break; break;
case '\010': /* BS */ case '\010': /* BS */
screen_write_cursorleft(&ictx->ctx, 1); screen_write_backspace(&ictx->ctx);
break; break;
case '\011': /* TAB */ case '\011': /* TAB */
/* Don't tab beyond the end of the line. */ /* Don't tab beyond the end of the line. */

20
screen-write.c
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@ -513,6 +513,25 @@ screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx)
s->cx -= nx; s->cx -= nx;
} }
/* Backspace; cursor left unless at start of wrapped line when can move up. */
void
screen_write_backspace(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct grid_line *gl;
if (s->cx == 0) {
if (s->cy == 0)
return;
gl = &s->grid->linedata[s->grid->hsize + s->cy - 1];
if (gl->flags & GRID_LINE_WRAPPED) {
s->cy--;
s->cx = screen_size_x(s) - 1;
}
} else
s->cx--;
}
/* VT100 alignment test. */ /* VT100 alignment test. */
void void
screen_write_alignmenttest(struct screen_write_ctx *ctx) screen_write_alignmenttest(struct screen_write_ctx *ctx)
@ -536,6 +555,7 @@ screen_write_alignmenttest(struct screen_write_ctx *ctx)
s->cy = 0; s->cy = 0;
s->rupper = 0; s->rupper = 0;
s->rlower = screen_size_y(s) - 1; s->rlower = screen_size_y(s) - 1;
tty_write(tty_cmd_alignmenttest, &ttyctx); tty_write(tty_cmd_alignmenttest, &ttyctx);

1
tmux.h
View File

@ -1646,6 +1646,7 @@ void screen_write_putc(
struct screen_write_ctx *, struct grid_cell *, u_char); struct screen_write_ctx *, struct grid_cell *, u_char);
void screen_write_copy(struct screen_write_ctx *, void screen_write_copy(struct screen_write_ctx *,
struct screen *, u_int, u_int, u_int, u_int); struct screen *, u_int, u_int, u_int, u_int);
void screen_write_backspace(struct screen_write_ctx *);
void screen_write_cursorup(struct screen_write_ctx *, u_int); void screen_write_cursorup(struct screen_write_ctx *, u_int);
void screen_write_cursordown(struct screen_write_ctx *, u_int); void screen_write_cursordown(struct screen_write_ctx *, u_int);
void screen_write_cursorright(struct screen_write_ctx *, u_int); void screen_write_cursorright(struct screen_write_ctx *, u_int);