feat: add fmt check command. (#66)

Makefile

@@ -14,15 +14,31 @@ embedmd:
 	fi
 	embedmd -d *.md
 
-test:
+fmt:
+	find . -name "*.go" -type f -not -path "./vendor/*" | xargs gofmt -s -w
+
+.PHONY: fmt-check
+fmt-check:
+	@if git diff --quiet --exit-code; then \
+		$(MAKE) fmt && git diff --exit-code || { \
+			git checkout .; \
+			echo; \
+			echo "Please run 'make fmt' and commit the result"; \
+			echo; \
+			false; } >&2; \
+	else { \
+		echo; \
+		echo "'make fmt-check' cannot be run with unstaged changes"; \
+		echo; \
+		false; } >&2; \
+	fi
+
+test: fmt-check
 	for PKG in $(PACKAGES); do go test -v -cover -coverprofile $$GOPATH/src/$$PKG/coverage.txt $$PKG || exit 1; done;
 
 html:
 	go tool cover -html=.cover/coverage.txt
 
-fmt:
-	find . -name "*.go" -type f -not -path "./vendor/*" | xargs gofmt -s -w
-
 vet:
 	go vet $(PACKAGES)
 

auth_jwt.go

@@ -114,9 +114,9 @@ func (mw *GinJWTMiddleware) MiddlewareInit() error {
 	}
 
 	if mw.IdentityHandler == nil {
-		mw.IdentityHandler = func (claims jwt.MapClaims) string {
-	    return claims["id"].(string)
-	  }
+		mw.IdentityHandler = func(claims jwt.MapClaims) string {
+			return claims["id"].(string)
+		}
 	}
 
 	if mw.Realm == "" {