CI enforce code format

.editorconfig

@@ -0,0 +1,4 @@
+root = true
+
+[*]
+end_of_line = lf

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

.github/workflows/test.yml

@@ -17,3 +17,15 @@ jobs:
       uses: actions/checkout@v2
     - name: Test
       run: go test -v ./...
+
+  check:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.16.x
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Check Code Formation
+      run: make fmt-check

Makefile

@@ -3,6 +3,7 @@
 #   all:          Builds the code locally after testing
 #
 #   fmt:          Formats the source files
+#   fmt-check:    Check if the source files are formated
 #   build:        Builds the code locally
 #   vet:          Vets the code
 #   lint:         Runs lint over the code (you do not need to fix everything)
@@ -11,6 +12,8 @@
 #
 #   install:      Builds, tests and installs the code locally
 
+GOFILES_NOVENDOR = $(shell find . -type f -name '*.go' -not -path "./vendor/*" -not -path "./.git/*")
+
 .PHONY: all fmt build vet lint test cover install
 
 # The first target is always the default action if `make` is called without
@@ -19,7 +22,10 @@
 all: fmt vet test install
 
 fmt:
-	@gofmt -s -w ./$*
+	@gofmt -s -w ${GOFILES_NOVENDOR}
+
+fmt-check:
+	@([ -z "$(shell gofmt -d $(GOFILES_NOVENDOR) | head)" ]) || (echo "Source is unformatted"; exit 1)
 
 build:
 	@go build