Add support for -transform=space

README.md

@@ -121,14 +121,14 @@ name := MyTypeValue.String() // name => "MyTypeValue"
 
 Sometimes you need to use some other string representation format than CamelCase (i.e. in JSON).
 
-To transform it from CamelCase to snake_case or kebab-case, you can use the `transform` flag.
+To transform it from CamelCase to snake_case, kebab-case, or space case you can use the `transform` flag.
 
 For example, the command `enumer -type=MyType -json -transform=snake` would generate the following string representation:
 
 ```go
 name := MyTypeValue.String() // name => "my_type_value"
 ```
-**Note**: The transformation only works form CamelCase to snake_case or kebab-case, not the other way around.
+**Note**: The transformation only works form CamelCase to snake_case, kebab-case, or space case, not the other way around.
 
 ## How to use
 The usage of Enumer is the same as Stringer, so you can refer to the [Stringer docs](https://godoc.org/golang.org/x/tools/cmd/stringer)
@@ -139,7 +139,7 @@ There are four boolean flags: `json`, `text`, `yaml` and `sql`. You can use any
 
 For enum string representation transformation the `transform` and `trimprefix` flags
 were added (i.e. `enumer -type=MyType -json -transform=snake`).
-Possible transform values are `snake` and `kebab` for transformation to snake_case and kebab-case accordingly.
+Possible transform values are `snake`, `kebab`, and `space` for transformation to snake_case, kebab-case, and space case accordingly.
 The default value for `transform` flag is `noop` which means no transformation will be performed.
 
 If a prefix is provided via the `trimprefix` flag, it will be trimmed from the start of each name (before

endtoend_test.go

@@ -64,6 +64,9 @@ func TestEndToEnd(t *testing.T) {
 		if name == "transform.go" {
 			typeName = "CamelCaseValue"
 			transformNameMethod = "snake"
+		} else if name == "transformspace.go" {
+			typeName = "CamelCaseValue"
+			transformNameMethod = "space"
 		}
 
 		stringerCompileAndRun(t, dir, stringer, typeName, name, transformNameMethod)
@@ -122,4 +125,4 @@ func runInDir(dir, name string, arg ...string) error {
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	return cmd.Run()
-}
+}

stringer.go

@@ -316,6 +316,8 @@ func (g *Generator) transformValueNames(values []Value, transformMethod string)
 		sep = '_'
 	case "kebab":
 		sep = '-'
+	case "space":
+		sep = ' '
 	default:
 		return
 	}

testdata/transformspace.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type CamelCaseValue int
+
+const (
+	CamelCaseValueOne CamelCaseValue = iota
+	CamelCaseValueTwo
+	CamelCaseValueThree
+)
+
+func main() {
+	ck(CamelCaseValueOne, "camel case value one")
+	ck(CamelCaseValueTwo, "camel case value two")
+	ck(CamelCaseValueThree, "camel case value three")
+	ck(-127, "CamelCaseValue(-127)")
+	ck(127, "CamelCaseValue(127)")
+}
+
+func ck(value CamelCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transformspace.go: " + str)
+	}
+}