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|
/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 2011, VU University Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(prolog_history,
[ prolog_history/1
]).
:- use_module(library(base32)).
/** <module> Per-directory persistent commandline history
This module implements persistency of the commandline history over
Prolog sessions on Prolog installations that are based on the GNU
readline library (default for the development version on Unix systems).
The history is stored in the directory =|~/.swipl-dir-history|=. For
each directory for which it keeps the history, there is file whose name
is the base32 encoding of the directory path.
This file is normally loaded when Prolog is started if =user_input= is a
terminal and the system supports history.
*/
:- create_prolog_flag(save_history, true, [type(boolean)]).
%% history_directory(-Dir) is semidet.
%
% Dir is the directory where the per-directory history databases
% are stored.
history_directory(Dir) :-
absolute_file_name(app_preferences('.swipl-dir-history'),
Dir,
[ access(write),
file_type(directory),
file_errors(fail)
]), !.
history_directory(Dir) :-
absolute_file_name(app_preferences('.'),
Home,
[ access(write),
file_type(directory),
file_errors(fail)
]),
atom_concat(Home, '/.swipl-dir-history', Dir),
( exists_directory(Dir)
-> fail
; make_directory(Dir)
).
%% dir_history_file(+Dir, -File) is det.
%% dir_history_file(?Dir, ?File) is nondet.
%
% File is the history file for a Prolog session running in Dir.
dir_history_file(Dir, File) :-
nonvar(Dir), !,
history_directory(Base),
absolute_file_name(Dir, Path),
base32(Path, Encoded),
atomic_list_concat([Base, Encoded], /, File).
dir_history_file(Dir, File) :-
history_directory(HDir),
directory_files(HDir, Files),
'$member'(Base32, Files),
base32(Dir, Base32),
atomic_list_concat([Dir, Base32], /, File).
% Realise write/read of history for the swipl-win.exe console.
:- if((\+current_predicate(rl_read_history/1),
current_predicate('$rl_history'/1))).
:- use_module(library(readutil)).
system:rl_read_history(File) :-
access_file(File, read), !,
setup_call_cleanup(
open(File, read, In, [encoding(utf8)]),
read_history(In),
close(In)).
system:rl_read_history(_).
read_history(In) :-
repeat,
read_line_to_codes(In, Codes),
( Codes == end_of_file
-> !
; atom_codes(Line, Codes),
rl_add_history(Line),
fail
).
system:rl_write_history(File) :-
'$rl_history'(Lines),
( Lines \== []
-> setup_call_cleanup(
open(File, write, Out, [encoding(utf8)]),
forall(member(Line, Lines),
format(Out, '~w~n', [Line])),
close(Out))
; true
).
:- endif.
:- if(current_predicate(rl_write_history/1)).
write_history(File) :-
current_prolog_flag(save_history, true), !,
catch(rl_write_history(File), _, true).
:- endif.
write_history(_).
%% prolog_history(+Action) is det.
%
% Execute Action on the history. Action is one of
%
% * enable
% Enable history. First loads history for the current directory.
% Loading the history is done at most once.
% * disable
% Sets the Prolog flag =save_history= to =false=, such that the
% history is not saved on halt.
:- if(current_predicate(rl_read_history/1)).
:- dynamic
history_loaded/1.
load_dir_history(File) :-
( exists_file(File)
-> rl_read_history(File),
assertz(history_loaded(File))
; true
).
prolog_history(enable) :-
history_loaded(_), !.
prolog_history(enable) :-
catch(dir_history_file('.', File), E,
(print_message(warning, E),fail)), !,
catch(load_dir_history(File), E,
print_message(warning, E)),
at_halt(write_history(File)),
set_prolog_flag(save_history, true).
:- endif.
prolog_history(_) :-
set_prolog_flag(save_history, false).
|
