Miscellaneous tasks that were found useful when building MPS-based
projects with Gradle.
Version 2.x
Version 2.x of the plugin is somewhat experimental and incompatible with 1.x because all extensions and tasks were
converted to use Gradle lazy properties.
Using the Plugin
Add the following buildscript block to your build script:
Use a fully specified version such as 1.0.123 for better build reproducibility.
Features
RunAntScript
This task is the base for other tasks that run MPS-generated Ant scripts (BuildLanguages, TestLanguages).
The custom tasks are useful when you don't check in the build scripts generated by MPS into source control but want to
generate them during the Gradle build. In that case you can't use the Ant integration of Gradle to run these files
because they may not exist yet when the build is started.
Usage
Parameters:
script: path to the ANT to execute
scriptClasspath: classpath used for the JVM that will execute the generated ANT script. Needs to contain ANT to be
able to run the build script. See below section "Providing Global Defaults" for project wide defaults.
scriptArgs: additional command line arguments provided to the JVM that will execute the generated ANT scripts. This
is often used to provide property valued via "-Dprop=value". See below section "Providing Global Defaults" for project wide defaults.
executable: the java executable to use. Optional. If itemis.mps.gradle.ant.defaultJavaExecutable extended
property is set, its value is used as the default value for the parameter.
includeDefaultArgs: controls whether the project-wide default values for arguments are used.
It's set to true by default.
includeDefaultClasspath: controls whether the project-wide default values for the classpath are used.
It's set to true by default.
targets: the targets to execute of the ANT files.
incremental: enable incremental build, see below. (Since 1.6.)
Providing Global Defaults For Class Path And Arguments
All tasks derived from the RunAntScript base class allow to specify default values for the classpath and script arguments
via project properties. By default these values are added to the value specified for the parameters scriptArgs and
scriptClasspath if they are present. To opt out from the defaults see above the parameters includeDefaultArgs and
includeDefaultClasspath.
The property itemis.mps.gradle.ant.defaultScriptArgs controls the default arguments provided to the build scripts
execution. In belows example the default arguments contain the version and build date. At runtime the default arguments
are combined with the arguments defined via scriptArgs.
The property itemis.mps.gradle.ant.defaultScriptClasspath controls the default classpath provided to the build scripts
execution. In belows example the classpath contains ANT (via dependency configuration) and the tools jar from the JDK.
At runtime the default classpath are combined with the classpath defined via scriptClasspath.
The itemis.mps.gradle.ant.defaultJavaExecutable property specifies the value to use as the underlying
JavaExec.executable. The executable parameter of each individual task takes precedence over the global default.
Incremental Builds
Incremental builds can be enabled by setting the incremental property to true. This has the following effects:
The clean target is removed from the targets list.
Argument -Dmps.generator.skipUnmodifiedModels=true is passed to Ant. This property tells the MPS generator to skip
generating and compiling models that have not been modified.
NOTE: While incremental builds are convenient, it is necessary to be aware of their limitations. To determine whether
a model should be regenerated the generator only looks at the hash of the model contents. If the contents have not
changed since the last generation the generation is skipped. This may not be fully correct in the general case. Changing
the generator of a language used by the model may affect the generated code for the model, for example. Changes in
imported models may affect the generation output of this model as well. None of these changes would be detected via the
model contents hash.
CreateDmg
(macOS only) Creates a .dmg installer by combining an RCP artifact (as
created by an MPS-generated Ant script), a JDK, and a background image.
rcpArtifact - the path to the RCP artifact produced by a build script.
jdkDependency - the coordinates of a JDK in case it's available in
a repository and can be resolved as a Gradle dependency.
jdk - the path to a JDK .tgz file.
backgroundImage - the path to the background image.
dmgFile - the path and file name of the output DMG image. Must end
with .dmg.
signKeyChain (optional) - the path and file name of the keychain which contains a code signing certificate.
signKeyChainPassword (optional) - the password which should be use to unlock the keychain.
signIdentity (optional) - the application ID of the code signing certificate.
Operation
The task unpacks rcpArtifact into a temporary directory, unpacks
the JDK given by jdkDependency/jdk under the jre subdirectory of
the unpacked RCP artifact, fixes file permissions and creates missing
symlinks. If the additional properties for code signing (signKeyChain, signKeyChainPassword, signIdentity) are defined,
the application will be signed with the given certificate. Afterwards a DMG image is created and its layout is configured using the
background image. Finally, the DMG is copied to dmgFile.
BundleMacosJdk
(Linux/macOS) Creates a .tar.gz by combining an RCP artifact and a JDK.
This task is intended as a substitute for the macOS-specific CreateDmg
task.
rcpArtifact - the path to the RCP artifact produced by a build script.
jdkDependency - the coordinates of a JDK in case it's available in
a repository and can be resolved as a Gradle dependency.
jdk - the path to a JDK .tgz file.
outputFile - the path and file name of the output gzipped tar archive.
Operation
The task unpacks rcpArtifact into a temporary directory, unpacks
the JDK given by jdkDependency/jdk under the jre subdirectory of
the unpacked RCP artifact, fixes file permissions and creates missing
symlinks. Finally, the file is repackaged again as tar/gzip.
GenerateLibrariesXml
Generates a .mps/libraries.xml file using data from property files.
defaults - path to default properties (checked in to version control)
overrides - path to property overrides (ignored, not checked in to
version control, absent by default)
destination - path to the output libraries.xml
Operation
The task reads properties file defaults, then overrides (if
present). destination is then generated based on the properties.
Each property represents an entry in destination (a project library),
where the property name is the library name and the property value is
the path to the library.
Generate
Generate a specific or all models in a project without the need for a MPS model.
While technically possible generating languages with this task makes little sense as there is no way of packaging the
generated artifacts into JAR files. We only recommend using this for simple tasks where user defined models should be
generated in the CI build or from the commandline.
Usage
A minimal build script to generate a MPS project with no external plugins would look like this:
mpsConfig - the configuration used to resolve MPS. Currently only vanilla MPS is supported and no custom RCPs.
Custom plugins are supported via the pluginLocation parameter.
mpsLocation - optional location where to place the MPS files.
mpsVersion - optional if you use a [custom distribution](#Custom MPS Distribution) of MPS
javaExec - optional java executable to use.
pluginLocation - location where to load the plugins from. Structure needs to be a flat folder structure similar to the
plugins directory inside of the MPS installation.
plugins - optional list of plugins to load before generation is attempted.
The notation is new Plugin("pluginID", "somePath"). The first parameter is the plugin id.
For the second parameter "somePath" there are several options:
if it's an absolute path, the plugin is loaded from that path
if it's a folder located under pluginLocation the plugin is loaded from that folder
otherwise it should be a plugin folder located under the default mps/plugins
models - optional list of models to generate. If omitted all models in the project will be generated. Only full name
matched are supported and no RegEx or partial name matching.
macros - optional list of path macros. The notation is new Macro("name", "value").
projectLocation - location of the MPS project to generate.
debug - optionally allows to start the JVM that is used to generated with a debugger. Setting it to true will cause
the started JVM to suspend until a debugger is attached. Useful for debugging classloading problems or exceptions during
the build.
Model Check
Run the model check on a subset or all models in a project directly from gradle.
This functionality currently runs all model checks (typesystem, structure, constrains, etc.) from gralde. By default if
any of checks fails the complete build is failed. All messages (Info, Warning or Error) are reported through log4j to
the command line.
Usage
A minimal build script to check all models in a MPS project with no external plugins would look like this:
mpsConfig - the configuration used to resolve MPS. Currently only vanilla MPS is supported and no custom RCPs.
Custom plugins are supported via the pluginLocation parameter.
mpsLocation - optional location where to place the MPS files.
mpsVersion - optional if you use a [custom distribution](#Custom MPS Distribution) of MPS
javaExec - optional java executable to use.
pluginLocation - location where to load the plugins from. Structure needs to be a flat folder structure similar to the
plugins directory inside of the MPS installation.
plugins - optional list of plugins to load before generation is attempted.
The notation is new Plugin("pluginID", "somePath"). The first parameter is the plugin id.
For the second parameter "somePath" there are several options:
if it's an absolute path, the plugin is loaded from that path
if it's a folder located under pluginLocation the plugin is loaded from that folder
otherwise it should be a plugin folder located under the default mps/plugins
models - optional list of models to check. RegEx can be used for matching multiple models.
modules - optional list of modules to check. Expects ordinary name (w/o virtual folders). RegEx can be used for matching multiple modules.
If both parameters, models and modules, are omitted - all models in the project will be checked.
macros - optional list of path macros. The notation is new Macro("name", "value").
projectLocation - location of the MPS project to check.
errorNoFail - report errors but do not fail the build.
warningAsError - handles warnings as errors and will fail the build if any is found when errorNoFail is not set.
debug - optionally allows to start the JVM that is used to load MPS project with a debugger. Setting it to true will cause
the started JVM to suspend until a debugger is attached. Useful for debugging classloading problems or exceptions during
the build.
junitFile - allows storing the the results of the model check as a JUnit XML file. By default, the file will contain one
testcase for each model that was checked (s. junitFormat).
junitFormat - allows to change the format of the JUnit XML file, how the model checking errors will be reported. Possible options:
model (default) - generates one testcase for each model that was checked. If the model check reported any error for the model,
the testcase will fail and the message of the model checking error will be reported.
message - generates one testcase for each model check error. For uniqueness reasons, the name of the testcase will reflect the specific
model check error and the name of the testclass will be constructed from the checked node ID and its containing root node.
Full error message and the node URL will be reported in the testcase failure. Checked models will be mapped to testsuites with this option.
maxHeap - maximum heap size setting for the JVM that executes the modelchecker. This is useful to limit the heap usage
in scenarios like containerized build agents where the OS reported memory limit is not the maximum
to be consumed by the container. The value is a string understood by the JVM command line argument -Xmx e.g. 3G or `512M
Additional Plugins
By default only the minimum required set of plugins are loaded. This includes base language and some utilities like the
HTTP server from MPS. If your project requires additional plugins to be loaded this is done by setting plugin location
to the place where your jar files are placed and adding your plugin id and folder name to the plugins list:
Dependencies of the specified plugins are automatically loaded from the pluginlocation and the plugins directory of
MPS. If they are not found the the build will fail.
Download JetBrains Runtime
When building MPS projects with the JatBrains Runtime, the JDK/JRE used by MPS and other intellij based IDEs, it's
required to download the correct version of the runtime. Since the runtime is platform dependent it's required to
download a platform dependent binary. While it's possible to add the logic to your own build script we provide a convenient
way of doing this with a gradle plugin.
The download-jbr plugin will add new dependencies and a task to your build. It will add a dependency to com.jetbrains.jdk:jbr
to your build, you need to make sure that it is available in your dependency repositories. The itemis maven repository at
https://projects.itemis.de/nexus/content/repositories/mbeddr provides this dependency, but you can create your own with
the scripts located in mbeddr/build.publish.jdk
For easy consumption and incremental build support the plugin creates a task downloadJbr which exposes the location of
the java executable via the javaExecutable property. See the tests in src/test/kotlin/JBRDownloadTest.kt for an example
how to use it.
jbrVersion - version of the JBR to download. While this supports maven version selectors we highly recomment not
using wildcards like * or + in there for reproducible builds.
distributionType - optional distribution type for the JBR to use. Will default to jbr_jcef if omitted.
downloadDir - optional directory where the downloaded JBR is downloaded and extracted to. The plugin defaults to
build/jbrDownload
Custom MPS Distribution
Features that perform an action inside an MPS project, like the modelcheck or generate-models plugin, require
an MPS available to them. While for vanilla MPS it is enough to pass in a reference to the MPS dependency via the
mpsConfig property this doesn't work for custom distributions of MPS. A custom distribution of MPS is also called
a MPS RCP. If you like to use your own MPS distribution with preinstalled plugins and your own versioning scheme
then this is possible but requires additional steps in the build script.
When you are using a custom distribution of MPS you can no longer use the mpsConfig property and rely on
the plugin resolving it. The plugin needs to be configured with the properties mpsVersion and mpsLocation
being set and no value set for mpsConfig. If you set mpsVersion but also set mpsConfig then mpsConfig
will take precedence over mpsVersion and the plugin will resolve that configuration into mpsLocation.
mpsVersion needs to be set to the exact MPS version your custom distribution is based on e.g. if you build a
RCP with MPS 2020.3.3 you need to set this property to 2020.3.3. mpsLocation needs to point to the location
where you extracted your custom MPS distribution into e.g. $buildDir/myAwesomeMPS if you extracted into that location.
Each of the plugins creates a resolveMpsFor<name> task in the build. When mpsVersion and mpsLocation are set
this task is still present in the task graph but becomes a noop. The task is present to be able to add your own task(s)
as dependency to it. This is useful for extracting your custom distribution before its being used. A minimal example
could look like this:
def myCustomLocation = "$buildDir/myAwesomeMPS"
task downloadAndExtractCustomMPS() {
// your logic to download and extract here
}
modelcheck {
mpsLocation.set(myCustomLocation)
mpsVersion.set("2020.3.3")
projectLocation.set(file("$rootDir/mps-prj"))
modules.set(["my.solution.with.errors"])
junitFile.set(file("$buildDir/TEST-modelcheck-results.xml"))
}
tasks.getByName("resolveMpsForModelcheck").dependsOn(downloadAndExtractCustomMPS)
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