________________________________________________________________________

This file is part of Logtalk <https://logtalk.org/>  
SPDX-FileCopyrightText: 1998-2023 Paulo Moura <pmoura@logtalk.org>  
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
________________________________________________________________________


% be sure to have download the required JAR files before attempting to
% run this example; see the `NOTES.txt` file for details

% start by setting the Java CLASSPATH environment variable; three backend
% Prolog systems are supported (LVM, SWI-Prolog, and YAP) and for each one
% there's a Bash script file that sets the CLASSPATH environment variable
% when sourced; for example, when using SWI-Prolog:

$ cd "$LOGTALKUSER/examples/document_converter"
$ . set_classpath_swi.sh


% second, start Logtalk and load the example:

| ?- logtalk_load(document_converter(loader)).
...


% convert a "sample.pdf" document to a "sample.txt" file:

| ?- document::convert('sample.pdf', 'sample.txt').

yes


% get the text contents of a "sample.pdf" document:

| ?- document::contents('sample.pdf', Contents).

Contents = ...
yes
