Add gometalinter (amacneil#36)

.gometalinter.json

@@ -0,0 +1,26 @@
+{
+  "Sort": ["linter", "severity", "path", "line"],
+  "WarnUnmatchedDirective": true,
+  "DisableAll": true,
+  "Enable": [
+    "deadcode",
+    "errcheck",
+    "gocyclo",
+    "gofmt",
+    "goimports",
+    "golint",
+    "interfacer",
+    "lll",
+    "maligned",
+    "megacheck",
+    "misspell",
+    "nakedret",
+    "structcheck",
+    "unconvert",
+    "unparam",
+    "varcheck",
+    "vet"
+  ],
+  "Cyclo": 12,
+  "LineLength": 100
+}

Dockerfile

@@ -15,9 +15,8 @@ RUN apt-get update \
 # development dependencies
 RUN curl -fsSL -o /usr/local/bin/dep https://github.com/golang/dep/releases/download/v0.3.2/dep-linux-amd64 \
 	&& chmod +x /usr/local/bin/dep
-RUN go get \
-	github.com/golang/lint/golint \
-	github.com/kisielk/errcheck
+RUN go get gopkg.in/alecthomas/gometalinter.v2 \
+	&& gometalinter.v2 --install
 
 # copy source files
 COPY . /go/src/github.com/amacneil/dbmate

Makefile

@@ -19,9 +19,7 @@ test:
 
 .PHONY: lint
 lint:
-	golint -set_exit_status $(PACKAGES)
-	go vet $(PACKAGES)
-	errcheck $(PACKAGES)
+	gometalinter.v2 $(PACKAGES)
 
 .PHONY: clean
 clean:

main_test.go

@@ -11,9 +11,7 @@ import (
 )
 
 func testContext(t *testing.T, u *url.URL) *cli.Context {
-	var err error
-
-	err = os.Setenv("DATABASE_URL", u.String())
+	err := os.Setenv("DATABASE_URL", u.String())
 	require.Nil(t, err)
 
 	app := NewApp()

pkg/dbmate/db.go

@@ -182,11 +182,7 @@ func (db *DB) NewMigration(name string) error {
 
 	defer mustClose(file)
 	_, err = file.WriteString(migrationTemplate)
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return err
 }
 
 func doTransaction(db *sql.DB, txFunc func(Transaction) error) error {

pkg/dbmate/mysql.go

@@ -105,7 +105,7 @@ func mysqldumpArgs(u *url.URL) []string {
 	if username := u.User.Username(); username != "" {
 		args = append(args, "--user="+username)
 	}
-	// mysql recommands against using environment variables to supply password
+	// mysql recommends against using environment variables to supply password
 	// https://dev.mysql.com/doc/refman/5.7/en/password-security-user.html
 	if password, set := u.User.Password(); set {
 		args = append(args, "--password="+password)