Documentation/4.4/Developers/Tutorials/BundleModulesIntoExtension
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Contents
Overview
Extensions are packaged against a specific version of Slicer, to be distributed and available for a revision X of Slicer, extensions have to be build against that same revision of Slicer. Otherwise, an extension will be considered as incompatible.
- If you are not familiar with the extension creation and contribution process, consider reading Step-by-step: How to create, publish and distribute an extension.
CMake variables
To create an extension, the following CMake variables should be defined:
| CMake variable | Description | Mandatory |
|---|---|---|
EXTENSION_NAME
|
Name of the extension | 
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EXTENSION_HOMEPAGE
|
Url of the web page describing the extension |
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EXTENSION_CATEGORY
|
Extension category |
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EXTENSION_CONTRIBUTORS
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Extension contributor specified as Firstname1 Lastname1 ([SubOrg1, ]Org1), Firstname2 Lastname2 ([SubOrg2, ]Org2)
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EXTENSION_DESCRIPTION
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One line describing what is the purpose of the extension | |
EXTENSION_ICONURL
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Url to an icon (png, size 128x128 pixels) | |
EXTENSION_SCREENSHOTURLS
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Space separated list of urls to images | |
EXTENSION_DEPENDS
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List of extensions required to build this extension. Specify "NA" if there are no dependency. |
List of partially supported CMake variables:
| CMake variable | Description |
|---|---|
EXTENSION_STATUS
|
Give people an idea what to expect from this code |
Project layout
The code should be organized as illustrated below:
MyExtension <- - - - - - - - - - - - - - - - - - - - - - Top-level folder of the extension project
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|-- CMakeLists.txt
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|-- MyExtension.png
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|-- MyCLIModule
| |
| |-- CMakeLists.txt
| |
| |-- MyCLIModule.cxx
| |
| |-- MyCLIModule.xml
. .
. .
|
|-- MyLoadableModule
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|-- CMakeLists.txt
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|-- qSlicerMyLoadableModuleModule.cxx
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|-- qSlicerMyLoadableModuleModule.h
.
.
Top-level CMakeLists.txt
The top-level CMakeLists.txt could be organized as reported below:
cmake_minimum_required(VERSION 2.8.9)
#-----------------------------------------------------------------------------
# Extension meta-information <- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - EXTENSION SPECIFIC
set(EXTENSION_NAME MyExtension) <- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - EXTENSION SPECIFIC
set(EXTENSION_HOMEPAGE "http://www.slicer.org/wiki/Documentation/4.1/Extensions/${EXTENSION_NAME}") <- - - - EXTENSION SPECIFIC
set(EXTENSION_CATEGORY "Examples") <- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - EXTENSION SPECIFIC
set(EXTENSION_CONTRIBUTORS "Jean-Christophe Fillion-Robin (Kitware)") <- - - - - - - - - - - - - - - - - - - - - - - - - - - EXTENSION SPECIFIC
set(EXTENSION_DESCRIPTION "This is an example of extension bundling a CLI, a loadable and a scripted module") <- - - - - - - EXTENSION SPECIFIC
set(EXTENSION_ICONURL "http://viewvc.slicer.org/viewvc.cgi/Slicer4/trunk/Extensions/Testing/LoadableExtensionTemplate/Resources/Icons/LoadableExtensionTemplate.png?revision=19437&view=co")
#-----------------------------------------------------------------------------
find_package(Slicer REQUIRED)
include(${Slicer_USE_FILE})
#-----------------------------------------------------------------------------
add_subdirectory(MyCLIModule)
add_subdirectory(MyLoadableModule)
[...]
#-----------------------------------------------------------------------------
include(${Slicer_EXTENSION_CPACK}) <- - - - - EXTENSION SPECIFIC
Possible tweak of Module level CMakeLists.txt
During the development process, it could be useful to be able to build each module against a given slicer build tree without having to build the complete extensions, to do so the CMakeLists.txt of each module could include find_package(Slicer REQUIRED).
For example, the CMakeLists.txt of MyCLIModule module that would be bundled into MyExtension could include the following code:
cmake_minimum_required(VERSION 2.8.9)
#-----------------------------------------------------------------------------
set(MODULE_NAME MyCLIModule) # Do not use 'project()'
#-----------------------------------------------------------------------------
find_package(Slicer REQUIRED)
include(${Slicer_USE_FILE})
[...]
