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%%%----------------------------------------------------------------------
%%% File : edit_display.erl
%%% Author : Luke Gorrie <luke@bluetail.com>
%%% Purpose : Editor display process: talks to curses
%%% Created : 16 Sep 2000 by Luke Gorrie <luke@bluetail.com>
%%%----------------------------------------------------------------------
-module(edit_display).
-author('luke@bluetail.com').
-include_lib("ermacs/include/edit.hrl").
-compile(export_all).
%%-export([Function/Arity, ...]).
draw_window(Window) when Window#window.minibuffer == true,
Window#window.status_text /= undefined ->
?EDIT_TERMINAL:move_to(0, Window#window.y),
draw_line(Window#window.status_text),
Window#window{status_text=undefined};
draw_window(Window) ->
try_update(Window).
try_update(Window) ->
Buf = Window#window.buffer,
PointMax = edit_buf:point_max(Buf),
DStart = edit_buf:mark_pos(Buf, Window#window.start_mark),
Scan = edit_lib:beginning_of_line_pos(Buf, DStart),
Point = edit_buf:mark_pos(Buf, point),
Chars = (?EDIT_TERMINAL:width() * ?EDIT_TERMINAL:height()) * 4, %% FIXME
Text = edit_buf:get_region(Buf, Scan, min(PointMax, Scan + Chars)),
?EDIT_TERMINAL:move_to(0, Window#window.y),
Rows = edit_window:text_lines(Window),
Prefix = Window#window.prefix,
PLen = length(Prefix),
PAcc = lists:reverse(Prefix),
case try_update_loop(Text,Rows,Scan,PLen,0,Point,undefined,PAcc) of
{X, Y} ->
%% draw mode line
draw_modeline(Window),
TrimX = edit_lib:min(X, Window#window.width - 1),
?EDIT_TERMINAL:move_to(TrimX, Y + Window#window.y),
Window;
undefined ->
%% The point wasn't inside the area we drew, so we
%% recenter the display with the point in the middle and
%% then draw again.
try_update(recenter_window(Window))
end.
%% Returns the location of the point in a tuple {X, Y}, or undefined
%% if it wasn't in the area drawn.
try_update_loop(Text, NRows, Scan, Col, Row, Point, PointXY, Acc)
when Scan == Point,
PointXY == undefined ->
try_update_loop(Text,NRows,Scan,Col,Row,Point,{Col, Row},Acc);
try_update_loop([$\n|T], NRows, Scan, Col, Row, Point, PointXY, Acc) ->
draw_line(lists:reverse(Acc)),
?EDIT_TERMINAL:newline(),
NextRow = Row+1,
if NextRow == NRows ->
PointXY;
true ->
try_update_loop(T,NRows,Scan+1,0,Row+1,Point,PointXY, [])
end;
try_update_loop([$\t|T], NRows, Scan, Col, Row, Point, PointXY, Acc) ->
Size = 8 - (Col rem 8),
Tab = lists:duplicate(Size, $ ),
try_update_loop(T,NRows,Scan+1,Col+Size,Row,Point,PointXY,Tab++Acc);
try_update_loop([H|T], NRows, Scan, Col, Row, Point, PointXY, Acc) ->
try_update_loop(T,NRows,Scan+1,Col+1,Row,Point,PointXY,[H|Acc]);
try_update_loop([], NRows, Scan, Col, Row, Point, PointXY, Acc) ->
draw_line(lists:reverse(Acc)),
RemainingRows = NRows - Row,
%% draw empty lines until the end
dotimes(fun() -> draw_line([]),
?EDIT_TERMINAL:newline()
end,
RemainingRows),
PointXY.
draw_line(L) ->
Wth = ?EDIT_TERMINAL:width(),
Str = trunc_line(L, Wth),
?EDIT_TERMINAL:put_string(L),
?EDIT_TERMINAL:erase_to_eol().
trunc_line([H], 1) -> [H];
trunc_line(_, 1) -> [$$];
trunc_line([H|T], N) -> [H|trunc_line(T, N-1)];
trunc_line([], _) -> [].
draw_modeline(Window) when Window#window.minibuffer == true ->
ok;
draw_modeline(Window) ->
Buffer = Window#window.buffer,
Where = modeline_where(Window, Buffer),
Text = lists:flatten(
io_lib:format("--:?? ~s (~s) ~s",
[atom_to_list(Buffer),
(edit_buf:get_mode(Buffer))#mode.name,
Where])),
?EDIT_TERMINAL:font_reverse(),
?EDIT_TERMINAL:move_to(0, Window#window.y +
edit_window:physical_lines(Window) - 1),
draw_line(Text),
?EDIT_TERMINAL:font_normal().
modeline_where(Window, Buffer) ->
case edit_buf:get_size(Buffer) of
0 ->
"ALL";
BSize ->
Start = edit_buf:mark_pos(Buffer, Window#window.start_mark),
Percentage = trunc(Start * 100 / BSize),
io_lib:format("~p%", [Percentage])
end.
%% Update the display_start of a window so that it presents the point
%% in the middle of the screen.
recenter_window(Window) ->
Buf = Window#window.buffer,
Height = edit_window:text_lines(Window),
Pos = backward_lines(Buf, trunc(Height / 2)),
edit_buf:move_mark(Buf, Window#window.start_mark, Pos),
Window.
backward_lines(Buf, N) ->
StartPos = edit_lib:beginning_of_line_pos(Buf),
edit_buf:walk_backward(Buf,
fun(X) -> back_lines(X, N, StartPos) end,
StartPos).
back_lines(finish, N, Pos) ->
{result, 1};
back_lines($\n, N, Pos) ->
if
N == 1 ->
{result, Pos};
true ->
{more, fun(New) -> back_lines(New, N-1, Pos-1) end}
end;
back_lines(_, N, Pos) ->
{more, fun(New) -> back_lines(New, N, Pos-1) end}.
dotimes(Fun, 0) ->
true;
dotimes(Fun, N) when integer(N), N > 0 ->
Fun(),
dotimes(Fun, N-1).
min(X, Y) when X < Y -> X;
min(X, Y) -> Y.
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