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%%%----------------------------------------------------------------------
%%% File : edit_util.erl
%%% Author : Luke Gorrie <luke@bluetail.com>
%%% Purpose : Utility functions
%%% Created : 15 Oct 2000 by Luke Gorrie <luke@bluetail.com>
%%%----------------------------------------------------------------------
-module(edit_util).
-author('luke@bluetail.com').
-include_lib("ermacs/include/edit.hrl").
-export([keyname/1, status_msg/2, status_msg/3, update_minibuffer_window/2,
select_window/2, update/3]).
-compile(export_all).
keyname(263) -> "C-h";
keyname(127) -> "C-h";
keyname(272) -> "C-h";
keyname(C) ->
case ctrl_p(C) of
true ->
"C-" ++ keyname(tolower(unctrl(C)));
false ->
case meta_p(C) of
true ->
"M-" ++ keyname(tolower(unmeta(C)));
false ->
[C]
end
end.
%% Eighth bit set means meta
meta_p(C) -> C band meta_bit() /= 0.
unmeta(C) -> C band (bnot meta_bit()).
meta_bit() -> 2#10000000.
ctrl_p(C) -> Base = unmeta(C), ((Base band 2#01000000) == 0) and (Base < 32).
unctrl(C) -> C + 64.
tolower(C) when C >= $A, C =< $Z ->
C - $A + $a;
tolower(C) ->
C.
%% Show a one-line message in the status line (where the minibuffer is)
status_msg(State, Fmt, Args) ->
status_msg(State, io_lib:format(Fmt, Args)).
status_msg(State, String) ->
Text = lists:flatten(String),
AllWindows = [State#state.curwin | State#state.windows],
NewWindows = update(fun(Win) -> Win#window{status_text=Text} end,
fun(Win) -> Win#window.minibuffer end,
AllWindows),
State#state{curwin=hd(NewWindows),
windows=tl(NewWindows)}.
kill_newlines([]) ->
[];
kill_newlines([$\n|T]) ->
[$ |
kill_newlines(lists:dropwhile(fun(C) -> C == $ end, T))];
kill_newlines([H|T]) ->
[H|kill_newlines(T)].
%% Apply Fun to minibuffer window and put the result in the state.
update_minibuffer_window(State, Fun) ->
AllWindows = [State#state.curwin | State#state.windows],
NewWindows = update(Fun,
fun(Win) -> Win#window.minibuffer end,
AllWindows),
State#state{curwin=hd(NewWindows),
windows=tl(NewWindows)}.
%% Map over all windows in State with Fun.
%% Fun is fun(Win) -> Win'
window_map(State, Fun) ->
State#state{curwin=Fun(State#state.curwin),
windows=lists:map(Fun, State#state.windows)}.
%% Return a list of all windows in State.
windows(State) ->
[State#state.curwin | State#state.windows].
%% Use F to update the first item of L which satisfies P.
%% e.g.
update(F, P, []) ->
[];
update(F, P, [H|T]) ->
case P(H) of
true ->
[F(H)|T];
false ->
[H|update(F, P, T)]
end.
%% Select the first window satisfying P, or crash if no match
select_window(State, P) ->
case P(State#state.curwin) of
true ->
State;
false ->
select_window1(State, P, State#state.windows, [State#state.curwin])
end.
select_window1(State, P, [], Acc) ->
exit(nomatch);
select_window1(State, P, [H|T], Acc) ->
case P(H) of
true ->
State#state{curwin=H,
windows=T ++ lists:reverse(Acc)};
false ->
select_window1(State, P, T, [H|Acc])
end.
set_buffer(State, Buffer) ->
Win = edit_window:attach(State#state.curwin, Buffer),
State#state{curwin = Win,
buffers = [Buffer | (State#state.buffers -- [Buffer])]}.
%% Display the message `String'. If it's only one line, it's shown in
%% the status line. Otherwise, a buffer called `Buf' is popped up to
%% show it.
popup_message(State, Buf, String) ->
popup_message(State, Buf, "~s", [String]).
popup_message(State, Buf, Format, Args) ->
String = lists:flatten(io_lib:format(Format, Args)),
case monoline(String) of
{true, Line} ->
edit_util:status_msg(State, Line);
false ->
edit_buf:new(Buf), % might be already started, s'ok
edit_buf:set_text(Buf, String),
popup_buffer(State, Buf)
end.
%% See if a string fits on one line.
%% Returns: {true, Line} | false
%% Where Line is the same as the input string, but with no newlines.
monoline(S) -> monoline(S, []).
monoline([$\n], Acc) -> {true, lists:reverse(Acc)};
monoline([], Acc) -> {true, lists:reverse(Acc)};
monoline([$\n|T], Acc) -> false;
monoline([H|T], Acc) -> monoline(T, [H|Acc]).
%% Make `Buffer' visible (but not selected) in a window - either by hijacking
%% an existing window or creating a new one.
popup_buffer(State, Buffer) ->
case lists:any(fun(W) -> W#window.buffer == Buffer end, windows(State)) of
true ->
%% already visible
State;
false ->
popup_buffer1(State, Buffer)
end.
popup_buffer1(State = #state{windows=[MB]}, Buffer)
when MB#window.minibuffer == true ->
%% Clause: One normal window, which is curwin. Split it.
{A, B} = split_window(State#state.curwin),
popup_buffer1(State#state{curwin=A,
windows=[B,MB]},
Buffer);
popup_buffer1(State = #state{windows=[Win]}, Buffer)
when (State#state.curwin)#window.minibuffer == true ->
%% Clause: One normal window, minibuffer is curwin. Split normal
%% window.
{A, B} = split_window(Win),
popup_buffer1(State#state{windows=[A,B]}, Buffer);
popup_buffer1(State, Buffer) when State#state.windows > 1 ->
%% OK! The first non-minibuffer is used.
State#state{windows=popup_buffer_in(State#state.windows, Buffer)}.
popup_buffer_in([W|Ws], Buffer) when W#window.minibuffer == false ->
[edit_window:attach(W, Buffer) | Ws];
popup_buffer_in([MB|Ws], Buffer) ->
[MB | popup_buffer_in(Ws, Buffer)].
split_window(W) ->
Height = W#window.height,
HeightA = trunc(Height / 2),
HeightB = Height - HeightA,
io:format("Height = ~p~nHeightA = ~p~nHeightB = ~p~n",
[Height, HeightA, HeightB]),
New = edit_window:make_window(W#window.buffer,
W#window.y + HeightA,
W#window.width,
HeightB),
{W#window{height=HeightA}, New}.
%% spawn process with some borrowed buffers
spawn_with(Buffer, M, F, A) ->
spawn_with(Buffer, {M, F, A}).
spawn_with(Buffers, What) ->
Ref = make_ref(),
Pid = spawn_link(?MODULE, spawn_with_init, [self(), Ref, Buffers, What]),
receive {ready, Ref} -> ok end.
spawn_with_init(Pid, Ref, Buffers, What) ->
lists:foreach(fun(Buf) -> edit_buf:borrow(Buf) end,
Buffers),
Pid ! {ready, Ref},
spawn_with_apply(What),
%% we miss this redraw if the command crashes. oops.
edit:invoke_later(?MODULE, redraw, []).
spawn_with_apply({M, F, A}) ->
apply(M, F, A);
spawn_with_apply(Fun) when function(Fun) ->
Fun().
redraw(State) ->
%% Actually we needn't do anything, because the screen redraws
%% after each command. (What a pointless abstraction :-)
State.
%% Get the current working directory for the state or buffer.
pwd(State) when record(State, state) ->
pwd((State#state.curwin)#window.buffer);
pwd(Buf) when atom(Buf) ->
case edit_buf:get_filename(Buf) of
undefined ->
case file:get_cwd() of
{ok, Path} ->
case lists:last(Path) of
$/ ->
Path;
_ ->
Path ++ "/"
end;
_ ->
undefined
end;
Filename ->
filename:dirname(Filename)++"/"
end.
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