Add Scala 2 example

.gitignore

@@ -1,3 +1,4 @@
 templates/**/*.wasm
 /target
 .idea
+.DS_Store

examples/scala2/INSTRUCTIONS

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+See the documentation about installing tooling: https://golem.cloud/learn/scala2
+
+Build the project with sbt:
+  sbt component
+
+The `target/dist/component-name.wasm` file is ready to be uploaded to Golem Cloud!

examples/scala2/scala2-shopping-cart/.gitignore

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+.bsp
+.idea
+target
+node_modules

examples/scala2/scala2-shopping-cart/.scalafmt.conf

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+version = 2.7.5
+maxColumn = 120
+align = most
+continuationIndent.defnSite = 2
+assumeStandardLibraryStripMargin = true
+docstrings = JavaDoc
+lineEndings = preserve
+includeCurlyBraceInSelectChains = false
+danglingParentheses = true
+spaces {
+  inImportCurlyBraces = true
+}
+optIn.annotationNewlines = true
+
+rewrite.rules = [SortImports, RedundantBraces]

examples/scala2/scala2-shopping-cart/build.sbt

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+ThisBuild / version := "0.1.0"
+
+ThisBuild / scalaVersion := "2.13.12"
+
+lazy val root = (project in file("."))
+  .settings(
+    name := "component-name"
+  )
+  .enablePlugins(ScalaJSPlugin)
+  .settings(
+    scalaJSLinkerConfig ~= { _.withModuleKind(ModuleKind.ESModule) },
+    Compile / fullLinkJS / scalaJSLinkerOutputDirectory := target.value / "dist"
+  )
+
+lazy val witBindgen = taskKey[Unit]("Runs golem-scalajs-wit-bindgen to generate WIT bindings")
+
+witBindgen := {
+  import scala.sys.process._
+
+  Seq("bash", "-xc", "golem-scalajs-wit-bindgen -w wit/main.wit -p example").!!
+}
+
+lazy val component = taskKey[Unit]("Runs componentize-js on the generated main.js file")
+
+component := {
+  import scala.sys.process._
+
+  Seq("bash", "-xc", "npm install").!!
+  Seq("bash", "-xc", "npm run build").!!
+}
+
+component := (component dependsOn (Compile / fullLinkJS)).value
+
+Compile / sourceGenerators += Def.task {
+  import scala.sys.process._
+
+  val file = (Compile / sourceManaged).value / "scala" / "example" / "Api.scala"
+
+  IO.write(
+    file,
+    Seq("bash", "-xc", "golem-scalajs-wit-bindgen -w wit/main.wit -p example").!!
+  )
+
+  Seq(file)
+}.taskValue

examples/scala2/scala2-shopping-cart/componentize.js

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+import { componentize } from '@bytecodealliance/componentize-js';
+import { readFile, writeFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+
+const jsSource = await readFile('target/dist/main.js', 'utf8');
+
+const { component } = await componentize(jsSource, {
+  witPath: resolve('wit'),
+  enableStdout: true,
+  preview2Adapter: 'adapters/tier2/wasi_snapshot_preview1.wasm'
+});
+
+await writeFile('target/dist/component-name.wasm', component);

examples/scala2/scala2-shopping-cart/metadata.json

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+{
+  "description": "A stateful Golem actor representing a shopping cart, implemented in Scala 2 using Scala.js",
+  "requiresAdapter": true,
+  "exclude": [
+    "target",
+    "node_modules"
+  ]
+}