Explore how to leverage Boot for integrating with ClojureScript, Docker, and managing polyglot builds, enhancing your Clojure development workflow.
Boot, a powerful build automation tool for Clojure, offers a flexible and extensible platform for integrating with a variety of tools and technologies. In this section, we will explore how Boot can be used to integrate with ClojureScript, Docker, and manage polyglot builds involving Java or other JVM languages. By understanding these integrations, you can enhance your development workflow and accommodate diverse project requirements.
ClojureScript, a dialect of Clojure that compiles to JavaScript, is a popular choice for building modern web applications. Boot provides excellent support for ClojureScript, enabling seamless integration into your build process.
To get started with ClojureScript in a Boot project, you need to include the necessary dependencies and configure the build pipeline. Here’s a step-by-step guide:
Add Dependencies: Update your build.boot
file to include the ClojureScript dependency.
(set-env!
:dependencies '[[org.clojure/clojurescript "1.10.844"]
[adzerk/boot-cljs "2.1.5"]])
Configure Build Pipeline: Define a Boot task to compile ClojureScript.
(require '[adzerk.boot-cljs :refer [cljs]])
(deftask build-cljs
"Compile ClojureScript"
[]
(comp
(cljs :source-map true
:optimizations :advanced
:output-to "target/main.js")))
Run the Build: Execute the task to compile your ClojureScript code.
boot build-cljs
This setup compiles your ClojureScript code into a single JavaScript file, ready for use in your web application.
Boot’s flexibility allows you to integrate other frontend build processes, such as bundling and minification, using additional tasks or plugins. For example, you can use the boot-cljs-repl
plugin for live reloading during development:
(set-env!
:dependencies '[[adzerk/boot-cljs-repl "0.3.3"]
[weasel "0.7.0"]])
(require '[adzerk.boot-cljs-repl :refer [cljs-repl start-repl]])
(deftask dev
"Start development environment with live reloading"
[]
(comp
(watch)
(cljs-repl)
(start-repl)
(cljs :source-map true)
(target :dir #{"target"})))
Running boot dev
starts a development server with live reloading, enhancing your development experience.
Docker is a widely used platform for containerizing applications, providing a consistent environment for development and deployment. Boot can be integrated with Docker to streamline the build and deployment process.
To build a Docker image using Boot, you can define a task that executes Docker commands. Here’s an example of how to build a Docker image for a Clojure application:
Create a Dockerfile: Define the Dockerfile for your application.
FROM clojure:openjdk-11-lein
COPY target/ /app/
WORKDIR /app
CMD ["java", "-jar", "your-app.jar"]
Define a Boot Task: Create a Boot task to build the Docker image.
(deftask docker-build
"Build Docker image"
[]
(comp
(sift :include #{#"target/.*"})
(target :dir #{"docker-build"})
(shell "docker build -t your-app:latest docker-build")))
Execute the Task: Run the task to build the Docker image.
boot docker-build
This task copies the compiled application into a Docker image, ready for deployment.
You can also define tasks to run Docker containers, facilitating local development and testing. Here’s an example:
(deftask docker-run
"Run Docker container"
[]
(shell "docker run -p 8080:8080 your-app:latest"))
Running boot docker-run
starts the Docker container, exposing the application on port 8080.
In modern software development, it’s common to use multiple languages and technologies within a single project. Boot’s extensibility makes it an excellent choice for managing polyglot builds involving Java, Scala, or other JVM languages.
Boot can easily integrate Java code into your build process. Here’s how you can compile and package Java code alongside Clojure:
Add Java Source Path: Update your build.boot
file to include the Java source path.
(set-env!
:source-paths #{"src/clj" "src/java"}
:dependencies '[[org.clojure/clojure "1.10.3"]])
Compile Java Code: Use the javac
task to compile Java code.
(require '[boot.task.built-in :refer [javac]])
(deftask compile-java
"Compile Java code"
[]
(javac :source-paths #{"src/java"}))
Package the Application: Combine Java and Clojure code into a single JAR file.
(deftask build
"Build the application"
[]
(comp
(compile-java)
(uber)
(jar :main 'your.main.namespace)))
Run the Build: Execute the task to build the application.
boot build
This setup compiles Java and Clojure code, packaging them into a single executable JAR file.
Boot’s flexibility extends to other JVM languages, such as Scala or Kotlin. By configuring the appropriate source paths and dependencies, you can manage builds involving multiple languages.
For example, to integrate Scala, you can add the Scala compiler and runtime as dependencies and configure the build pipeline accordingly.
Boot’s pipeline architecture and extensibility make it an ideal choice for projects with diverse requirements. Whether you’re building a web application with ClojureScript, containerizing your application with Docker, or managing a polyglot codebase, Boot provides the tools and flexibility to streamline your workflow.
Boot allows you to define custom pipelines and tasks tailored to your project’s needs. By composing tasks, you can create complex build processes that automate various aspects of your development workflow.
Here’s an example of a custom pipeline that combines multiple tasks:
(deftask full-build
"Full build pipeline"
[]
(comp
(clean)
(compile-java)
(build-cljs)
(docker-build)))
Running boot full-build
executes the entire build pipeline, from cleaning the workspace to building Docker images.
Integrating Boot with other tools and technologies enhances your development workflow, providing a flexible and powerful platform for building modern applications. By leveraging Boot’s capabilities, you can streamline the integration of ClojureScript, Docker, and polyglot builds, accommodating diverse project requirements with ease.