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This file is part of Logtalk
Copyright 1998-2020 Paulo Moura

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

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.


This tool provides basic on-line help for Logtalk when running in a limited set of operating-systems.

API documentation

This tool API documentation is available at:


For sample queries, please see the SCRIPT.txt file in the tool directory.


| ?- logtalk_load(help(loader)).

Supported operating-systems

Currently, support is limited to Linux, macOS, and Windows.

On Windows, the start command must be available. On Linux, the xdg-open command must be available. On macOS, the command open is used.

This tool relies on the library portable operating-system access abstraction.

Known issues

On macOS, the open command used to open documentation URLs drops the anchors, thus preventing navigating to the specified position on the documentation page.

ECLiPSe defines a help prefix operator that forces wrapping this atom between parenthesis when sending messages to the tool. E.g. use (help)::help instead of help::help.

Other notes

All source files are indented using tabs (a common setting is a tab width equivalent to 4 spaces).

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