Add CI workflow to lint and check formatting of Go code

On every push and pull request that affects relevant files, check the Go module for:

- Common detectable errors in the code.
- Use of outdated APIs
- Code style violations
- Code formatting inconsistency
- Misconfiguration

.github/workflows/check-go-task.yml

@@ -0,0 +1,140 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-go-task.md
+name: Check Go
+
+env:
+  # See: https://github.com/actions/setup-go/tree/v2#readme
+  GO_VERSION: "1.14"
+
+# See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-go-task.ya?ml"
+      - "Taskfile.ya?ml"
+      - "**/go.mod"
+      - "**/go.sum"
+      - "**.go"
+  pull_request:
+    paths:
+      - ".github/workflows/check-go-task.ya?ml"
+      - "Taskfile.ya?ml"
+      - "**/go.mod"
+      - "**/go.sum"
+      - "**.go"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  check-errors:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Check for errors
+        run: task go:vet
+
+  check-outdated:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Modernize usages of outdated APIs
+        run: task go:fix
+
+      - name: Check if any fixes were needed
+        run: git diff --color --exit-code
+
+  check-style:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Check style
+        run: task --silent go:lint
+
+  check-formatting:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Format code
+        run: task go:format
+
+      - name: Check formatting
+        run: git diff --color --exit-code
+
+  check-config:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Run go mod tidy
+        run: task go:tidy
+
+      - name: Check whether any tidying was needed
+        run: git diff --color --exit-code

README.md

@@ -2,6 +2,7 @@
 
 [![Check Registry status](https://github.com/arduino/library-registry/actions/workflows/check-registry.yml/badge.svg)](https://github.com/arduino/library-registry/actions/workflows/check-registry.yml)
 [![Test Integration status](https://github.com/arduino/library-registry/actions/workflows/test-go-integration-task.yml/badge.svg)](https://github.com/arduino/library-registry/actions/workflows/test-go-integration-task.yml)
+[![Check Go status](https://github.com/arduino/library-registry/actions/workflows/check-go-task.yml/badge.svg)](https://github.com/arduino/library-registry/actions/workflows/check-go-task.yml)
 [![Check Python status](https://github.com/arduino/library-registry/actions/workflows/check-python-task.yml/badge.svg)](https://github.com/arduino/library-registry/actions/workflows/check-python-task.yml)
 [![Check General Formatting status](https://github.com/arduino/library-registry/actions/workflows/check-general-formatting-task.yml/badge.svg)](https://github.com/arduino/library-registry/actions/workflows/check-general-formatting-task.yml)
 

Taskfile.yml

@@ -4,6 +4,8 @@ version: "3"
 vars:
   GO_PROJECT_PATH: .github/workflows/assets/validate-registry
   LDFLAGS:
+  DEFAULT_GO_PACKAGES:
+    sh: cd "{{.GO_PROJECT_PATH}}" && echo $(go list ./... | tr '\n' ' ')
 
 tasks:
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-general-formatting-task/Taskfile.yml
@@ -24,6 +26,58 @@ tasks:
     cmds:
       - go build -v {{.LDFLAGS}}
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
+  go:check:
+    desc: Check for problems with Go code
+    dir: "{{.GO_PROJECT_PATH}}"
+    deps:
+      - task: go:vet
+      - task: go:lint
+
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
+  go:vet:
+    desc: Check for errors in Go code
+    dir: "{{.GO_PROJECT_PATH}}"
+    cmds:
+      - go vet {{default .DEFAULT_GO_PACKAGES .GO_PACKAGES}}
+
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
+  go:fix:
+    desc: Modernize usages of outdated APIs
+    dir: "{{.GO_PROJECT_PATH}}"
+    cmds:
+      - go fix {{default .DEFAULT_GO_PACKAGES .GO_PACKAGES}}
+
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
+  go:lint:
+    desc: Lint Go code
+    dir: "{{.GO_PROJECT_PATH}}"
+    cmds:
+      - |
+        PROJECT_PATH="$PWD"
+        # `go get` and `go list` commands must be run from a temporary folder to avoid polluting go.mod
+        cd "$(mktemp -d "${TMPDIR-${TMP-/tmp}}/task-temporary-XXXXX")"
+        go get golang.org/x/lint/golint
+        GOLINT_PATH="$(go list -f '{{"{{"}}.Target{{"}}"}}' golang.org/x/lint/golint || echo "false")"
+        # `golint` must be run from the module folder
+        cd "$PROJECT_PATH"
+        "$GOLINT_PATH" \
+          {{default "-min_confidence 0.8 -set_exit_status" .GO_LINT_FLAGS}} \
+          {{default .DEFAULT_GO_PACKAGES .GO_PACKAGES}}
+
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
+  go:format:
+    desc: Format Go code
+    dir: "{{.GO_PROJECT_PATH}}"
+    cmds:
+      - go fmt {{default .DEFAULT_GO_PACKAGES .GO_PACKAGES}}
+
+  go:tidy:
+    desc: Run go mod tidy
+    dir: "{{.GO_PROJECT_PATH}}"
+    cmds:
+      - go mod tidy
+
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/test-go-integration-task/Taskfile.yml
   go:test-integration:
     desc: Run integration tests