linenoise: enhanced multi-line mode with line breaks.

The linenoise multi-line mode is just a glorified line
wrapper, and not actualy a multi-line editor, like in GNU
Readline and others. This commit fixes it. The edit buffer can
now contain line breaks, separated by carriage return
characters. (In single-line mode, these characters continue
to be displayed as ^M). The row and column calculations in the
multi-line refresh follow this data representation.

* linenoise/linenoise.c (sync_data_to_buf): This function
now takes an extra argument telling it whether multi-line mode
is in effect for the rendering. In multi-line mode, the prompt
is now added to the display data, so that multi-line refresh
is simplified by not having to account for the prompt length
in various calculations. Also, in multi-line mode, carriage
returns are rendered to display as CR-LF pairs, since they
denote embedded line breaks.
(complete_line): Pass mlmode to sync_data_to_buf.
(struct row_values): New struct, for returning multiple
row values out of a function.
(screen_rows, col_offset_in_str): New static functions.
(refresh_multiline): Modified to use screen_rows and
col_offset_in_str for its calculations, and not to deal with
the prompt at all, since the prompt is rolled into the display
data.
(refresh_line, edit_insert): Pass mlmode to sync_data_to_buf.

* txr.1: Documented multi-line mode.

0 files changed, 0 insertions, 0 deletions