Merge pull request #1 from winitzki/feature/add_ci

add git workflows

.github/workflows/build-and-test.yml

@@ -0,0 +1,60 @@
+jobs:
+  build:
+    name: Build
+    needs:
+      - checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: "actions/checkout@v2"
+        with:
+          submodules: 'true'
+      - name: "~/.sbt\n\"~/.cache/coursier\"\n cache"
+        uses: "actions/cache@v3"
+        with:
+          key: "${{ runner.os }}-sbt-${{ hashFiles('build.sbt', 'project/plugins.sbt', 'project/build.properties') }}"
+          path: |
+            ~/.sbt
+            "~/.cache/coursier"
+          restore-keys: |
+            ${{ runner.os }}-sbt
+      - name: "java ${{ matrix.java}} setup"
+        uses: "actions/setup-java@v1.4.3"
+        with:
+          architecture: x64
+          java-package: jdk
+          java-version: "${{ matrix.java}}"
+      - run: "sbt -DJDK_VERSION=${{ matrix.java}} \"++${{ matrix.scala}} test\""
+    strategy:
+      matrix:
+        java:
+          - '8.0.382'
+          - '11.0.21'
+          - '17.0.9'
+        scala:
+          - '2.13.11'
+  checks:
+    name: Check formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: "actions/checkout@v2"
+        with:
+          submodules: 'true'
+      - name: "~/.sbt\n\"~/.cache/coursier\"\n cache"
+        uses: "actions/cache@v3"
+        with:
+          key: "${{ runner.os }}-sbt-${{ hashFiles('build.sbt', 'project/plugins.sbt', 'project/build.properties') }}"
+          path: |
+            ~/.sbt
+            "~/.cache/coursier"
+          restore-keys: |
+            ${{ runner.os }}-sbt
+      - name: java 17 setup
+        uses: "actions/setup-java@v1.4.3"
+        with:
+          architecture: x64
+          java-package: jdk
+          java-version: '17'
+      - run: sbt scalafmtCheckAll scalafmtSbtCheck
+name: scall_build_and_test
+on:
+  push: {}

.scalafmt.conf

@@ -0,0 +1,18 @@
+# See https://scalameta.org/scalafmt/docs/configuration.html
+version=3.7.17 # This is the version of the scalafmt formatter core.
+runner.dialect=scala213 # May need to override this for some files.
+preset=IntelliJ
+maxColumn = 160
+align.preset=most
+rewrite.trailingCommas.style = multiple
+rewrite.trailingCommas.allowFolding = true
+verticalMultiline.arityThreshold = 5
+verticalMultiline.newlineAfterOpenParen = true
+rewriteTokens = {
+  "⇒": "=>"
+  "→": "->"
+  "←": "<-"
+}
+importSelectors = singleLine
+optIn.breakChainOnFirstMethodDot = false
+optIn.breaksInsideChains = true

README.md

@@ -1,2 +1,16 @@
 # sofp-solutions
+
 Solutions for exercises in the book "Science of functional programming"
+
+Solutions for each chapter is a submodule in this project.
+
+Common code may be put into the `common` submodule.
+
+# Code formatting
+
+The GitHub job will verify that all code is properly formatted.
+
+To reformat code, run the script:
+
+`bash reformat_all_code.sh`
+

build.sbt

@@ -5,9 +5,7 @@ val scalaV  = scala2V
 val munitTest      = "org.scalameta" %% "munit" % "0.7.29" % Test
 def munitFramework = new TestFramework("munit.Framework")
 
-
-val assertVerboseTest = "com.eed3si9n.expecty" %% "expecty"       % "0.16.0" % Test
-
+val assertVerboseTest = "com.eed3si9n.expecty" %% "expecty" % "0.16.0" % Test
 
 lazy val root = (project in file("."))
   .settings(scalaVersion := scalaV, crossScalaVersions := Seq(scalaV), name := "sofp-solutions-root")
@@ -21,10 +19,7 @@ lazy val chapter01 = (project in file("chapter01"))
     Test / fork              := false,
     scalafmtFailOnErrors     := false,
     testFrameworks += munitFramework,
-    libraryDependencies ++= Seq(
-      munitTest,
-      assertVerboseTest,
-    ),
+    libraryDependencies ++= Seq(munitTest, assertVerboseTest),
   ).dependsOn(common)
 
 lazy val chapter02 = (project in file("chapter02"))
@@ -35,22 +30,15 @@ lazy val chapter02 = (project in file("chapter02"))
     Test / fork              := false,
     scalafmtFailOnErrors     := false,
     testFrameworks += munitFramework,
-    libraryDependencies ++= Seq(
-      munitTest,
-      assertVerboseTest,
-    ),
+    libraryDependencies ++= Seq(munitTest, assertVerboseTest),
   ).dependsOn(common)
 
-lazy val common = (project in file("common"))
-  .settings(
-    scalaVersion             := scalaV,
-    crossScalaVersions       := Seq(scala2V, scala3V),
-    Test / parallelExecution := true,
-    Test / fork              := false,
-    scalafmtFailOnErrors     := false,
-    testFrameworks += munitFramework,
-    libraryDependencies ++= Seq(
-      munitTest,
-      assertVerboseTest,
-    ),
-  )
+lazy val common = (project in file("common")).settings(
+  scalaVersion             := scalaV,
+  crossScalaVersions       := Seq(scala2V, scala3V),
+  Test / parallelExecution := true,
+  Test / fork              := false,
+  scalafmtFailOnErrors     := false,
+  testFrameworks += munitFramework,
+  libraryDependencies ++= Seq(munitTest, assertVerboseTest),
+)

chapter01/src/test/scala/sofp/unit/Exercises_1_6_1.scala

@@ -0,0 +1,17 @@
+package sofp.unit
+
+import com.eed3si9n.expecty.Expecty.expect
+
+import munit.FunSuite
+
+class Exercises_1_6_1 extends FunSuite {
+
+  test("exercise 1.6.1.1") {
+
+    def staggeredFactorial(n: Int): Int = (n to 1 by -2).product
+
+    expect(staggeredFactorial(8) == 384)
+    expect(staggeredFactorial(9) == 945)
+  }
+
+}

github-scala-build-and-test.dhall

@@ -0,0 +1,56 @@
+let GithubActions =
+      https://regadas.dev/github-actions-dhall/package.dhall
+        sha256:71df44892a17abca817cfb35e2612d117f7fceec55114a6eb76b65a7eea4e6f4
+
+let matrix =
+      toMap { java = [ "8.0.382", "11.0.21", "17.0.9" ], scala = [ "2.13.11" ] }
+
+let setup =
+      [ GithubActions.steps.actions/checkout // { `with` = Some (toMap { submodules = "true" }) }
+      , GithubActions.steps.actions/cache
+          { path =
+              ''
+              ~/.sbt
+              "~/.cache/coursier"
+              ''
+          , key = "sbt"
+          , hashFiles =
+            [ "build.sbt"
+            , "project/plugins.sbt"
+            , "project/build.properties"
+            ]
+          }
+      ]
+
+in  GithubActions.Workflow::{
+    , name = "scall_build_and_test"
+    , on = GithubActions.On::{
+      , push = Some GithubActions.Push::{=}
+      --, pull_request = Some GithubActions.PullRequest::{=}
+      }
+    , jobs = toMap
+        { checks = GithubActions.Job::{
+          , name = Some "Check formatting"
+          , runs-on = GithubActions.types.RunsOn.ubuntu-latest
+          , steps =
+                setup
+              # [ GithubActions.steps.actions/setup-java { java-version = "17" }
+                , GithubActions.steps.run
+                    { run = "sbt scalafmtCheckAll scalafmtSbtCheck" }
+                ]
+          }
+        , build = GithubActions.Job::{
+          , name = Some "Build"
+          , needs = Some [ "checks" ]
+          , strategy = Some GithubActions.Strategy::{ matrix }
+          , runs-on = GithubActions.types.RunsOn.ubuntu-latest
+          , steps =
+                setup
+              # [ GithubActions.steps.actions/setup-java
+                    { java-version = "\${{ matrix.java}}" }
+                , GithubActions.steps.run
+                    { run = "sbt -DJDK_VERSION=\${{ matrix.java}} \"++\${{ matrix.scala}} test\"" }
+                ]
+          }
+        }
+    }

reformat_all_code.sh

@@ -0,0 +1 @@
+sbt scalafmtAll scalafmtSbt

update_github_actions.sh

@@ -0,0 +1 @@
+dhall-to-yaml --file github-scala-build-and-test.dhall > .github/workflows/build-and-test.yml