feature: file namestyle (#223)

* add api filename style

* new feature: config.yaml

* optimize

* optimize logic generation

* check hanlder valid

* optimize

* reactor naming style

* optimize

* optimize test

* optimize gen middleware

* format

Co-authored-by: anqiansong <anqiansong@xiaoheiban.cn>
Co-authored-by: kim <xutao@xiaoheiban.cn>

tools/goctl/util/name/naming.go

@@ -0,0 +1,41 @@
+package name
+
+import (
+	"strings"
+
+	"github.com/tal-tech/go-zero/tools/goctl/util/stringx"
+)
+
+type NamingStyle = string
+
+const (
+	NamingLower NamingStyle = "lower"
+	NamingCamel NamingStyle = "camel"
+	NamingSnake NamingStyle = "snake"
+)
+
+// IsNamingValid validates whether the namingStyle is valid or not,return
+// namingStyle and true if it is valid, or else return empty string
+// and false, and it is a valid value even namingStyle is empty string
+func IsNamingValid(namingStyle string) (NamingStyle, bool) {
+	if len(namingStyle) == 0 {
+		namingStyle = NamingLower
+	}
+	switch namingStyle {
+	case NamingLower, NamingCamel, NamingSnake:
+		return namingStyle, true
+	default:
+		return "", false
+	}
+}
+
+func FormatFilename(filename string, style NamingStyle) string {
+	switch style {
+	case NamingCamel:
+		return stringx.From(filename).ToCamel()
+	case NamingSnake:
+		return stringx.From(filename).ToSnake()
+	default:
+		return strings.ToLower(stringx.From(filename).ToCamel())
+	}
+}

tools/goctl/util/name/naming_test.go

@@ -0,0 +1,35 @@
+package name
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsNamingValid(t *testing.T) {
+	style, valid := IsNamingValid("")
+	assert.True(t, valid)
+	assert.Equal(t, NamingLower, style)
+
+	_, valid = IsNamingValid("lower1")
+	assert.False(t, valid)
+
+	_, valid = IsNamingValid("lower")
+	assert.True(t, valid)
+
+	_, valid = IsNamingValid("snake")
+	assert.True(t, valid)
+
+	_, valid = IsNamingValid("camel")
+	assert.True(t, valid)
+}
+
+func TestFormatFilename(t *testing.T) {
+	assert.Equal(t, "abc", FormatFilename("a_b_c", NamingLower))
+	assert.Equal(t, "ABC", FormatFilename("a_b_c", NamingCamel))
+	assert.Equal(t, "a_b_c", FormatFilename("a_b_c", NamingSnake))
+	assert.Equal(t, "a", FormatFilename("a", NamingSnake))
+	assert.Equal(t, "A", FormatFilename("a", NamingCamel))
+	// no flag to convert to snake
+	assert.Equal(t, "abc", FormatFilename("abc", NamingSnake))
+}