Build ls app using scala-cli

.github/scripts/package.sc

@@ -0,0 +1,25 @@
+//> using scala "3.1.2"
+//> using lib "com.lihaoyi::os-lib:0.8.0"
+import scala.util.Properties
+
+val platformSuffix: String = {
+  val os =
+    if (Properties.isWin) "pc-win32"
+    else if (Properties.isLinux) "pc-linux"
+    else if (Properties.isMac) "apple-darwin"
+    else sys.error(s"Unrecognized OS: ${sys.props("os.name")}")
+  os
+}
+val artifactsPath = os.Path("artifacts", os.pwd)
+val destPath =
+  if (Properties.isWin) artifactsPath / s"ls-$platformSuffix.exe"
+  else artifactsPath / s"ls-$platformSuffix"
+val scalaCLILauncher =
+  if (Properties.isWin) "scala-cli.bat" else "scala-cli"
+
+os.makeDir(artifactsPath)
+os.proc(scalaCLILauncher, "package", ".", "-o", destPath, "--native-image")
+  .call(cwd = os.pwd)
+  .out
+  .text()
+  .trim

.github/workflows/ci.yml

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+name: CI
+on:
+  push:
+    branches:
+    - main
+    tags:
+    - "v*"
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.OS }}
+    strategy:
+      matrix:
+        OS: ["ubuntu-latest", "macos-latest", "windows-latest"]
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - uses: coursier/cache-action@v6.3
+    - uses: VirtusLab/scala-cli-setup@v0.1
+    - run: scala-cli test .
+    - name: Package app
+      run: scala-cli .github/scripts/package.sc
+    - uses: actions/upload-artifact@v3
+      with:
+        name: launchers
+        path: artifacts
+        if-no-files-found: error
+        retention-days: 2
+
+  format:
+    runs-on: "ubuntu-latest"
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - uses: coursier/cache-action@v6.3
+    - uses: VirtusLab/scala-cli-setup@v0.1
+    - name: Scalafmt check
+      run: |
+        scala-cli fmt --check . || (
+          echo "To format code run"
+          echo "  scala-cli fmt ."
+          exit 1
+        )

.scalafmt.conf

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+version = 3.5.2
+runner.dialect = scala3

Ls.scala

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+//> using scala "3.1.2"
+//> using lib "com.lihaoyi::os-lib:0.8.0"
+
+@main def hello(args: String*) =
+  val path = args.headOption match
+    case Some(p) => os.Path(p, os.pwd)
+    case _       => os.pwd
+
+  if (os.isDir(path)) println(os.list(path).mkString(","))
+  else System.err.println("Expected directory path as an input")

TestLs.test.scala

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+//> using lib "org.scalameta::munit::0.7.27"
+
+import scala.util.Properties
+
+class TestsLs extends munit.FunSuite {
+  test("ls") {
+    // prepare test directory
+    val tempDir = os.temp.dir()
+    // create files
+    val expectedFiles = Seq("Ls", "Hello").map(tempDir / _)
+    expectedFiles.foreach(os.write(_, "Hello"))
+
+    // check
+    val scalaCLILauncher =
+      if (Properties.isWin) "scala-cli.bat" else "scala-cli"
+    val foundFiles =
+      os.proc(scalaCLILauncher, "Ls.scala", "--", tempDir)
+        .call()
+        .out
+        .text()
+        .trim
+
+    expectedFiles.map(_.toString).foreach { file =>
+      assert(foundFiles.contains(file))
+    }
+  }
+}