Sbt custom task

Sbt custom task

Please read the earlier pages in the Getting Started Guide first, in particular you need to understand build. A plugin extends the build definition, most commonly by adding new settings. The new settings could be new tasks. For example, a plugin could add a codeCoverage task which would generate a test coverage report. This is described in the next section. As of sbt 0. Many auto plugins should have their default settings automatically, however some may require explicit enablement.

The enablePlugins method allows projects to explicitly define the auto plugins they wish to consume. Projects can also exclude plugins using the disablePlugins method.

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For example, if we wish to remove the IvyPlugin settings from utilwe modify our build. Auto plugins should document whether they need to be explicitly enabled. Here, the plugins output is showing that the sbt default plugins are all enabled.

Older non-auto plugins often require settings to be added explicitly, so that multi-project build could have different types of projects. The plugin documentation will indicate how to configure it, but typically for older plugins this involves adding the base settings for the plugin and customizing as necessary. Roughly speaking, any. Because doing so would increase the dependency on the machine environment, this feature should be used sparingly.

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See Best Practices. For more details, including ways of developing plugins, see Plugins. For best practices, see Plugins-Best-Practices. Defining a dynamic input task with Def. What is a plugin?It assumes you have installed a recent version of sbt, such as sbt 1.

As part of your build definition you will specify the version of sbt that your build uses. This allows people with different versions of the sbt launcher to build the same projects with consistent results. If the required version is not available locally, the sbt launcher will download it for you.

If this file is not present, the sbt launcher will choose an arbitrary version, which is discouraged because it makes your build non-portable. A build definition is defined in build. Because the term project can be ambiguous, we often call it a subproject in this guide.

sbt custom task

For instance, in build. For example, one key is name and it maps to a string value, the name of your subproject. The key-value pairs are listed under the. Some among them are also called task expressions. We will see more on the difference later in this page. On the left-hand side, nameversionand scalaVersion are keys. The kinds of key are explained below. If you use the wrong value type, the build definition will not compile:.

Top-level object s and class es are not allowed in build. The built-in keys are just fields in an object called Keys. A build. Custom keys may be defined with their respective creation methods: settingKeytaskKeyand inputKey. Each method expects the type of the value associated with the key as well as a description. The name of the key is taken from the val the key is assigned to. For example, to define a key for a new task called hello. Here we have used the fact that an. All such definitions are evaluated before settings regardless of where they are defined in the file.

Note: Typically, lazy vals are used instead of vals to avoid initialization order problems. A TaskKey[T] is said to define a task. Tasks are operations such as compile or package. They may return Unit Unit is void for Scalaor they may return a value related to the task, for example package is a TaskKey[File] and its value is the jar file it creates.

Each time you start a task execution, for example by typing compile at the interactive sbt prompt, sbt will re-run any tasks involved exactly once. A given key always refers to either a task or a plain setting. For a setting, the value will be computed once at project load time. For a task, the computation will be re-run each time the task is executed.

From a type-system perspective, the Setting created from a task key is slightly different from the one created from a setting key. For most purposes this makes no difference; the task key still creates a value of type T when the task executes. The T vs.

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More on this in task graph. In sbt shell, you can type the name of any task to execute that task. This is why typing compile runs the compile task. If you type the name of a setting key rather than a task key, the value of the setting key will be displayed.Tasks and settings are introduced in the getting started guidewhich you may wish to read first.

This page has additional details and background and is intended more as a reference. The name of the val is used when referring to the task in Scala code and at the command line. The string passed to the taskKey method is a description of the task.

The type parameter passed to taskKey here, Int is the type of value produced by the task. The examples themselves are valid entries in a build. As mentioned in the introduction, a task is evaluated on demand.

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Each time sampleTask is invoked, for example, it will print the sum. If the username changes between runs, stringTask will take different values in those separate runs. Within a run, each task is evaluated at most once. In contrast, settings are evaluated once on project load and are fixed until the next reload. The values of the inputs are referenced by the value method. The following defines a task that adds one to the value produced by intTask and returns the result.

As with settings, tasks can be defined in a specific scope. For example, there are separate compile tasks for the compile and test scopes. The scope of a task is defined the same as for a setting. In the following example, test:sampleTask uses the result of compile:intTask.

As a reminder, infix method precedence is by the name of the method and postfix methods have lower precedence than infix methods. Without them, Scala interprets the line as helloTask. The implementation of a task can be separated from the binding.

sbt custom task

For example, a basic separate definition looks like:. Note that whenever. Completely override a task by not declaring the previous task as an input. Each of the definitions in the following example completely overrides the previous one.

sbt custom task

That is, when intTask is run, it will only print 3. Make sure to assign the ScopeFilter as a val! This is an implementation detail requirement of the. The all method is implicitly added to tasks and settings. It accepts a ScopeFilter that will select the Scopes.

A common scenario is getting the sources for all subprojects for processing all at once, such as passing them to scaladoc. The task that we want to obtain values for is sources and we want to get the values in all non-root projects and in the Compile configuration.

This looks like:. A basic ScopeFilter is constructed by the ScopeFilter. The simplest case is explicitly specifying the values for the parts:. If the task filter is not specified, as in the example above, the default is to select scopes without a specific task global.Keys is packed with examples illustrating how to define keys.

Most of the keys are implemented in Defaults. Keys have one of three types. SettingKey and TaskKey are described in. Read about InputKey on the Input Tasks page. The key constructors have two string parameters: the name of the key "scalaVersion" and a documentation string "The version of scala used for building. Remember from. Also remember from.

Keys may be defined in an. Any val s found under autoImport object of an enabled auto plugin will be imported automatically into your. You could be defining your own task, or you could be planning to redefine an existing task.

The hardest part about implementing tasks is often not sbt-specific; tasks are just Scala code. When depending on other tasks from a custom task using valuean important detail to note is the execution semantics of the tasks. By execution semantics, we mean exactly when these tasks are evaluated. If we take sampleIntTask for instance, each line in the body of the task should be strictly evaluated one after the other.

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That is sequential semantics:. In reality JVM may inline the sum to 3but the observable effect of the task will remain identical as if each line were executed one after the other. Now suppose we define two more custom tasks startServer and stopServerand modify sampleIntTask as follows:.

Unlike plain Scala method calls, invoking value method on tasks will not be evaluated strictly. Instead, they simply act as placeholders to denote that sampleIntTask depends on startServer and stopServer tasks. To demonstrate the last point, we can run sampleStringTask from sbt interactive prompt. Because sampleStringTask depends on both startServer and sampleIntTask task, and sampleIntTask also depends on startServer task, it appears twice as task dependency.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Is it possible to override or modify built-in SBT tasks like compile to depend on custom tasks in my own Build.

Overriding e.

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Since this question appears when Googling how to add a dependency in SBT, and the current answers are deprecated as of 0. Learn more. Adding new task dependencies to built-in SBT tasks? Ask Question. Asked 8 years, 7 months ago. Active 2 years, 4 months ago. Viewed 11k times.

Eemeli Kantola. Eemeli Kantola Eemeli Kantola 4, 5 5 gold badges 29 29 silver badges 41 41 bronze badges. Possible duplicate for SBT 0. Active Oldest Votes. Update: See arussell84's answer for a modern way to do this You should be able to do it like this: in a. James Moore James Moore 7, 5 5 gold badges 56 56 silver badges 78 78 bronze badges. There are so many 'compile's in there I can't work out how this generalizes to adding dependencies to other tasks.

What to I do to add a dependency to 'stage'? This answer is outdated. See the updated version I just posted. Please note that this suggestion only works for 'older' SBT 0. The current 0. How does the new version do this?

Martin Tournoij 21k 17 17 gold badges 80 80 silver badges bronze badges.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

If I define a simple task in SBT 0. I have to run tasks -vvv or tasks -V to see it, but here it's buried in hundreds of other tasks. My assumption was that my custom project tasks would be the most important!

Is there some way I can bump up the importance of my task so that it appears in the top-level tasks list? It would seem important that developers new to the project would be able to see such tasks without too much digging.

To add the rank parameter you may need to stop using the taskKey macro and instantiate the TaskKey class directly. So this lowercase t :. A full list of ranks can be found here.

Learn more. SBT: How do I get my custom task to appear in the tasks list? Ask Question. Asked 4 years, 5 months ago. Active 4 years, 5 months ago. Viewed times. Josh Josh 4, 6 6 gold badges 28 28 silver badges 42 42 bronze badges.

Active Oldest Votes.

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TaskKey has a rank parameter, add ATask after the description. ATask A full list of ranks can be found here. Josh 4, 6 6 gold badges 28 28 silver badges 42 42 bronze badges.

I tried this but it didn't work for me. Anything to keep in mind here? Ok, this is what I was missing. Cool tip, I never notice this detail.If an option includes double quotes as part of the argumentescape the double quotes using backslashes, for example, -Dmy.

You can pass environment variable values to custom Java properties. If there is not enough space, you can click and enter the string in the dialog that opens. Click to open the Environment Variables dialog where you can create variables and specify their values. When you edit a run configuration but not a run configuration templateyou can specify the following options:. By default, it is disabled, and when you start this configuration while another instance is still running, IntelliJ IDEA suggests to stop the running instance and start another one.

Save the file with the run configuration settings to share it with other team members. The default location is.

However, if you do not want to share the. Note that you cannot delete default configurations. Note that you create copies of default configurations. The button is displayed only when you select a temporary configuration. Click this button to save a temporary configuration as permanent. The templates are displayed under the Templates node and used for newly created configurations.

To create a folder, select the configurations within a category, clickand specify the folder name. If only a category is in focus, an empty folder is created.

Then, to move a configuration into a folder, between the folders or out of a folder, use drag or and buttons.

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To remove grouping, select a folder and click. Click this button to sort configurations in the alphabetical order. The tasks are performed in the order they appear in the list. Run External tool : select to run an external application. In the dialog that opens, select one or multiple applications you want to run.

Run/Debug Configuration: sbt Task

For more information, see External tools and External Tools. In the dialog that opens, select the configuration to be run. Build : select to compile the specified module. The Build Module command will be executed. Build Project : select to compile the entire project. The Build Project command will be executed. Build Artifacts : select this option to build an artifact or artifacts. In the dialog that opens, select the artifact or artifacts that should be built.

sbt custom task


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