fix

Readme update for alternative string values flag

.gitignore

@@ -4,7 +4,7 @@
 *.o
 *.a
 *.so
-
+cli
 # Folders
 _obj
 _test
@@ -20,9 +20,12 @@ _cgo_gotypes.go
 _cgo_export.*
 
 _testmain.go
-
+coverage.txt
 *.exe
 *.test
 *.prof
 
 .idea
+.vscode
+
+enumer

.travis.yml

@@ -0,0 +1,29 @@
+language: go
+dist: xenial
+matrix:
+  allow_failures:
+  - go: master
+  include:
+  - go: 1.17.x
+  - go: 1.18.x
+env:
+  global:
+  - GO111MODULE=on
+after_success:
+- make build-cli
+- bash <(curl -s https://codecov.io/bash)
+deploy:
+  provider: releases
+  api_key:
+    secure: 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
+  skip_cleanup: true
+  file:
+  - cli/build/enumer.linux-amd64.tar.gz
+  - cli/build/enumer.darwin-amd64.tar.gz
+  - cli/build/enumer.darwin-arm64.tar.gz
+  - cli/build/enumer.windows-amd64.exe.tar.gz
+  - cli/build/sha256sum.txt
+  on:
+    go: 1.17.x
+    repo: dmarkham/enumer
+    tags: true

Makefile

@@ -0,0 +1,26 @@
+
+
+test: 
+	go test -race -coverprofile=coverage.txt -covermode=atomic
+
+build-cli: clean
+	-mkdir -p ./cli/build
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o ./cli/build/enumer.linux-amd64  .
+	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -a -o ./cli/build/enumer.darwin-amd64 .
+	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -a -o ./cli/build/enumer.darwin-arm64 .
+	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -a -o ./cli/build/enumer.windows-amd64.exe .
+	cd ./cli/build && find . -name 'enumer*' | xargs -I{} tar czf {}.tar.gz {}
+	cd ./cli/build && shasum -a 256 * > sha256sum.txt
+	cat ./cli/build/sha256sum.txt
+
+
+# example: make release V=0.0.0
+release:
+	git tag v$(V)
+	@read -p "Press enter to confirm and push to origin ..." && git push origin v$(V)
+
+
+clean:
+	-rm -r ./cli/build
+
+SHELL = /bin/bash

README.md

@@ -1,41 +1,80 @@
-# Enumer [![GoDoc](https://godoc.org/github.com/alvaroloes/enumer?status.svg)](https://godoc.org/github.com/alvaroloes/enumer) [![Go Report Card](https://goreportcard.com/badge/github.com/alvaroloes/enumer)](https://goreportcard.com/report/github.com/alvaroloes/enumer) [![cover.run go](https://cover.run/go/github.com/alvaroloes/enumer.svg?tag=golang-1.10)](https://cover.run/go/github.com/alvaroloes/enumer?tag=golang-1.10)
+# Enumer [![GoDoc](https://godoc.org/git.internal/re/enumer?status.svg)](https://godoc.org/git.internal/re/enumer) [![Go Report Card](https://goreportcard.com/badge/git.internal/re/enumer)](https://goreportcard.com/report/git.internal/re/enumer) [![GitHub Release](https://img.shields.io/github/release/dmarkham/enumer.svg)](https://git.internal/re/enumer/releases)[![Build Status](https://travis-ci.com/dmarkham/enumer.svg?branch=master)](https://travis-ci.com/dmarkham/enumer)
+
+
 Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
-It started as a fork of [Rob Pike’s Stringer tool](https://godoc.org/golang.org/x/tools/cmd/stringer).
+It started as a fork of [Rob Pike’s Stringer tool](https://godoc.org/golang.org/x/tools/cmd/stringer)
+maintained by [Álvaro López Espinosa](https://github.com/alvaroloes/enumer). 
+This was again forked here as (https://git.internal/re/enumer) picking up where Álvaro left off.
 
-## Install
-Enumer can be installed as any other go command:
 
 ```
-go get github.com/alvaroloes/enumer
+$ ./enumer --help
+Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
+Usage of ./enumer:
+        Enumer [flags] -type T [directory]
+        Enumer [flags] -type T files... # Must be a single package
+For more information, see:
+        http://godoc.org/git.internal/re/enumer
+Flags:
+  -addprefix string
+        transform each item name by adding a prefix. Default: ""
+  -comment value
+        comments to include in generated code, can repeat. Default: ""
+  -gqlgen
+        if true, GraphQL marshaling methods for gqlgen will be generated. Default: false
+  -json
+        if true, json marshaling methods will be generated. Default: false
+  -linecomment
+        use line comment text as printed text when present
+  -output string
+        output file name; default srcdir/<type>_string.go
+  -sql
+        if true, the Scanner and Valuer interface will be implemented.
+  -text
+        if true, text marshaling methods will be generated. Default: false
+  -transform string
+        enum item name transformation method. Default: noop (default "noop")
+  -trimprefix string
+        transform each item name by removing a prefix. Default: ""
+  -type string
+        comma-separated list of type names; must be set
+  -values
+    	if true, alternative string values method will be generated. Default: false
+  -yaml
+        if true, yaml marshaling methods will be generated. Default: false
 ```
-After that, the `enumer` executable will be in "$GOPATH/bin" folder and you can use it with `go generate`
 
 
 ## Generated functions and methods
+
 When Enumer is applied to a type, it will generate:
 
-* The following basic methods/functions:
+- The following basic methods/functions:
+
+  - Method `String()`: returns the string representation of the enum value. This makes the enum conform
+    the `Stringer` interface, so whenever you print an enum value, you'll get the string name instead of a number.
+  - Function `<Type>String(s string)`: returns the enum value from its string representation. This is useful
+    when you need to read enum values from command line arguments, from a configuration file, or
+    from a REST API request... In short, from those places where using the real enum value (an integer) would
+    be almost meaningless or hard to trace or use by a human. `s` string is Case Insensitive.
+  - Function `<Type>Values()`: returns a slice with all the values of the enum
+  - Function `<Type>Strings()`: returns a slice with all the Strings of the enum
+  - Method `IsA<Type>()`: returns true only if the current value is among the values of the enum. Useful for validations.
+
+- When the flag `json` is provided, two additional methods will be generated, `MarshalJSON()` and `UnmarshalJSON()`. These make
+  the enum conform to the `json.Marshaler` and `json.Unmarshaler` interfaces. Very useful to use it in JSON APIs.
+- When the flag `text` is provided, two additional methods will be generated, `MarshalText()` and `UnmarshalText()`. These make
+  the enum conform to the `encoding.TextMarshaler` and `encoding.TextUnmarshaler` interfaces.
+  **Note:** If you use your enum values as keys in a map and you encode the map as _JSON_, you need this flag set to true to properly
+  convert the map keys to json (strings). If not, the numeric values will be used instead
+- When the flag `yaml` is provided, two additional methods will be generated, `MarshalYAML()` and `UnmarshalYAML()`. These make
+  the enum conform to the `gopkg.in/yaml.v2.Marshaler` and `gopkg.in/yaml.v2.Unmarshaler` interfaces.
+- When the flag `sql` is provided, the methods for implementing the `Scanner` and `Valuer` interfaces.
+  Useful when storing the enum in a database.
 
-  * Method `String()`: returns the string representation of the enum value. This makes the enum conform
-the `Stringer` interface, so whenever you print an enum value, you'll get the string name instead of a number.
-  * Function `<Type>String(s string)`: returns the enum value from its string representation. This is useful
-when you need to read enum values from command line arguments, from a configuration file, or
-from a REST API request... In short, from those places where using the real enum value (an integer) would
-be almost meaningless or hard to trace or use by a human.
-  * Function `<Type>Values()`: returns a slice with all the values of the enum
-  * Method `IsA<Type>()`: returns true only if the current value is among the values of the enum. Useful for validations.
-* When the flag `json` is provided, two additional methods will be generated, `MarshalJSON()` and `UnmarshalJSON()`. These make
-the enum conform to the `json.Marshaler` and `json.Unmarshaler` interfaces. Very useful to use it in JSON APIs.
-* When the flag `text` is provided, two additional methods will be generated, `MarshalText()` and `UnmarshalText()`. These make
-the enum conform to the `encoding.TextMarshaler` and `encoding.TextUnmarshaler` interfaces.
-**Note:** If you use your enum values as keys in a map and you encode the map as _JSON_, you need this flag set to true to properly
-convert the map keys to json (strings). If not, the numeric values will be used instead
-* When the flag `yaml` is provided, two additional methods will be generated, `MarshalYAML()` and `UnmarshalYAML()`. These make
-the enum conform to the `gopkg.in/yaml.v2.Marshaler` and `gopkg.in/yaml.v2.Unmarshaler` interfaces.
-* When the flag `sql` is provided, the methods for implementing the Scanner and Valuer interfaces will be also generated.
-Useful when storing the enum in a database.
 
 For example, if we have an enum type called `Pill`,
+
 ```go
 type Pill int
 
@@ -47,7 +86,9 @@ const (
 	Acetaminophen = Paracetamol
 )
 ```
+
 executing `enumer -type=Pill -json` will generate a new file with four basic methods and two extra for JSON:
+
 ```go
 func (i Pill) String() string {
 	//...
@@ -61,6 +102,10 @@ func PillValues() []Pill {
 	//...
 }
 
+func PillStrings() []string {
+	//...
+}
+
 func (i Pill) IsAPill() bool {
 	//...
 }
@@ -73,7 +118,9 @@ func (i *Pill) UnmarshalJSON(data []byte) error {
 	//...
 }
 ```
+
 From now on, we can:
+
 ```go
 // Convert any Pill value to string
 var aspirinString string = Aspirin.String()
@@ -81,7 +128,7 @@ var aspirinString string = Aspirin.String()
 fmt.Println("I need ", Paracetamol) // Will print "I need Paracetamol"
 
 // Convert a string with the enum name to the corresponding enum value
-pill, err := PillString("Ibuprofen")
+pill, err := PillString("Ibuprofen") // "ibuprofen" will also work.
 if err != nil {
     fmt.Println("Unrecognized pill: ", err)
     return
@@ -121,31 +168,55 @@ 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 another format, 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 from CamelCase to snake_case or kebab-case, not the other way around.
 
+### Transformers
+
+- snake
+- snake-upper
+- kebab
+- kebab-upper
+- lower (lowercase)
+- upper (UPPERCASE)
+- title (TitleCase)
+- title-lower (titleCase)
+- first (Use first character of string)
+- first-lower (same as first only lower case)
+- first-upper (same as first only upper case)
+- whitespace
+
 ## 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)
-for more information.
+
+For a module-aware repo with `enumer` in the `go.mod` file, generation can be called by adding the following to a `.go` source file:
+
+```golang
+//go:generate go run git.internal/re/enumer -type=YOURTYPE
+```
 
 There are four boolean flags: `json`, `text`, `yaml` and `sql`. You can use any combination of them (i.e. `enumer -type=Pill -json -text`),
 
-
 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`, `kebab` `macro` and `phrase` for transformation
-to snake_case, kebab-case, MACRO_CASE or a phrase (i.e. space-separated words) accordingly.
+Possible transform values are listed above in the [transformers](#transformers) section.
 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
 it is transformed). If a name doesn't have the prefix it will be passed unchanged.
 
+If a prefix is provided via the `addprefix` flag, it will be added to the start of each name (after trimming and after transforming).
+
+The boolean flag `values` will additionally create an alternative string values method `Values() []string` to fullfill the `EnumValues` interface of [ent](https://entgo.io/docs/schema-fields/#enum-fields).
+
 ## Inspiring projects
-* [Stringer](https://godoc.org/golang.org/x/tools/cmd/stringer)
-* [jsonenums](https://github.com/campoy/jsonenums)
+
+- [Álvaro López Espinosa](https://github.com/alvaroloes/enumer)
+- [Stringer](https://godoc.org/golang.org/x/tools/cmd/stringer)
+- [jsonenums](https://github.com/campoy/jsonenums)

endtoend_test.go

@@ -16,10 +16,24 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 )
 
+var (
+	// GOEXE defines the executable file name suffix (".exe" on Windows, "" on other systems).
+	// Must be defined here, cannot be read from ENVIRONMENT variables
+	GOEXE = ""
+)
+
+func init() {
+	// Set GOEXE for Windows platform
+	if runtime.GOOS == "windows" {
+		GOEXE = ".exe"
+	}
+}
+
 // This file contains a test that compiles and runs each program in testdata
 // after generating the string method for its type. The rule is that for testdata/x.go
 // we run stringer -type X and then compile and run the program. The resulting
@@ -31,8 +45,9 @@ func TestEndToEnd(t *testing.T) {
 		t.Fatal(err)
 	}
 	defer os.RemoveAll(dir)
+
 	// Create stringer in temporary directory.
-	stringer := filepath.Join(dir, "stringer.exe")
+	stringer := filepath.Join(dir, fmt.Sprintf("stringer%s", GOEXE))
 	err = run("go", "build", "-o", stringer)
 	if err != nil {
 		t.Fatalf("building stringer: %s", err)
@@ -50,20 +65,54 @@ func TestEndToEnd(t *testing.T) {
 	// Generate, compile, and run the test programs.
 	for _, name := range names {
 		if !strings.HasSuffix(name, ".go") {
-			t.Errorf("%s is not a Go file", name)
 			continue
 		}
 		if name == "cgo.go" && !build.Default.CgoEnabled {
 			t.Logf("cgo is no enabled for %s", name)
 			continue
 		}
-		// Names are known to be ASCII and long enough.
-		typeName := fmt.Sprintf("%c%s", name[0]+'A'-'a', name[1:len(name)-len(".go")])
-		transformNameMethod := "noop"
 
-		if name == "transform.go" {
-			typeName = "CamelCaseValue"
+		// Names are known to be ASCII and long enough.
+		var typeName string
+		var transformNameMethod string
+
+		switch name {
+		case "transform_snake.go":
+			typeName = "SnakeCaseValue"
 			transformNameMethod = "snake"
+		case "transform_snake_upper.go":
+			typeName = "SnakeUpperCaseValue"
+			transformNameMethod = "snake-upper"
+		case "transform_kebab.go":
+			typeName = "KebabCaseValue"
+			transformNameMethod = "kebab"
+		case "transform_kebab_upper.go":
+			typeName = "KebabUpperCaseValue"
+			transformNameMethod = "kebab-upper"
+		case "transform_upper.go":
+			typeName = "UpperCaseValue"
+			transformNameMethod = "upper"
+		case "transform_lower.go":
+			typeName = "LowerCaseValue"
+			transformNameMethod = "lower"
+		case "transform_title.go":
+			typeName = "TitleCaseValue"
+			transformNameMethod = "title"
+		case "transform_first.go":
+			typeName = "FirstCaseValue"
+			transformNameMethod = "first"
+		case "transform_first_upper.go":
+			typeName = "FirstUpperCaseValue"
+			transformNameMethod = "first-upper"
+		case "transform_first_lower.go":
+			typeName = "FirstLowerCaseValue"
+			transformNameMethod = "first-lower"
+		case "transform_whitespace.go":
+			typeName = "WhitespaceSeparatedValue"
+			transformNameMethod = "whitespace"
+		default:
+			typeName = fmt.Sprintf("%c%s", name[0]+'A'-'a', name[1:len(name)-len(".go")])
+			transformNameMethod = "noop"
 		}
 
 		stringerCompileAndRun(t, dir, stringer, typeName, name, transformNameMethod)

enumer.go

@@ -10,6 +10,10 @@ func %[1]sString(s string) (%[1]s, error) {
 	if val, ok := _%[1]sNameToValueMap[s]; ok {
 		return val, nil
 	}
+
+	if val, ok := _%[1]sNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
 	return 0, fmt.Errorf("%%s does not belong to %[1]s values", s)
 }
 `
@@ -22,6 +26,16 @@ func %[1]sValues() []%[1]s {
 }
 `
 
+// Arguments to format are:
+//	[1]: type name
+const stringsMethod = `// %[1]sStrings returns a slice of all String values of the enum
+func %[1]sStrings() []string {
+	strs := make([]string, len(_%[1]sNames))
+	copy(strs, _%[1]sNames)
+	return strs
+}
+`
+
 // Arguments to format are:
 //	[1]: type name
 const stringBelongsMethodLoop = `// IsA%[1]s returns "true" if the value is listed in the enum definition. "false" otherwise
@@ -39,11 +53,23 @@ func (i %[1]s) IsA%[1]s() bool {
 //	[1]: type name
 const stringBelongsMethodSet = `// IsA%[1]s returns "true" if the value is listed in the enum definition. "false" otherwise
 func (i %[1]s) IsA%[1]s() bool {
-	_, ok := _%[1]sMap[i]
+	_, ok := _%[1]sMap[i] 
 	return ok
 }
 `
 
+// Arguments to format are:
+//	[1]: type name
+const altStringValuesMethod = `func (%[1]s) Values() []string {
+	return %[1]sStrings()
+}
+`
+
+func (g *Generator) buildAltStringValuesMethod(typeName string) {
+	g.Printf("\n")
+	g.Printf(altStringValuesMethod, typeName)
+}
+
 func (g *Generator) buildBasicExtras(runs [][]Value, typeName string, runsThreshold int) {
 	// At this moment, either "g.declareIndexAndNameVars()" or "g.declareNameVars()" has been called
 
@@ -51,14 +77,32 @@ func (g *Generator) buildBasicExtras(runs [][]Value, typeName string, runsThresh
 	g.Printf("\nvar _%sValues = []%s{", typeName, typeName)
 	for _, values := range runs {
 		for _, value := range values {
-			g.Printf("\t%s, ", value.str)
+			g.Printf("\t%s, ", value.originalName)
 		}
 	}
 	g.Printf("}\n\n")
 
 	// Print the map between name and value
-	g.Printf("\nvar _%sNameToValueMap = map[string]%s{\n", typeName, typeName)
+	g.printValueMap(runs, typeName, runsThreshold)
+
+	// Print the slice of names
+	g.printNamesSlice(runs, typeName, runsThreshold)
+
+	// Print the basic extra methods
+	g.Printf(stringNameToValueMethod, typeName)
+	g.Printf(stringValuesMethod, typeName)
+	g.Printf(stringsMethod, typeName)
+	if len(runs) <= runsThreshold {
+		g.Printf(stringBelongsMethodLoop, typeName)
+	} else { // There is a map of values, the code is simpler then
+		g.Printf(stringBelongsMethodSet, typeName)
+	}
+}
+
+func (g *Generator) printValueMap(runs [][]Value, typeName string, runsThreshold int) {
 	thereAreRuns := len(runs) > 1 && len(runs) <= runsThreshold
+	g.Printf("\nvar _%sNameToValueMap = map[string]%s{\n", typeName, typeName)
+
 	var n int
 	var runID string
 	for i, values := range runs {
@@ -70,20 +114,33 @@ func (g *Generator) buildBasicExtras(runs [][]Value, typeName string, runsThresh
 		}
 
 		for _, value := range values {
-			g.Printf("\t_%sName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), &value)
+			g.Printf("\t_%sName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), value.originalName)
+			g.Printf("\t_%sLowerName%s[%d:%d]: %s,\n", typeName, runID, n, n+len(value.name), value.originalName)
 			n += len(value.name)
 		}
 	}
 	g.Printf("}\n\n")
+}
+func (g *Generator) printNamesSlice(runs [][]Value, typeName string, runsThreshold int) {
+	thereAreRuns := len(runs) > 1 && len(runs) <= runsThreshold
+	g.Printf("\nvar _%sNames = []string{\n", typeName)
 
-	// Print the basic extra methods
-	g.Printf(stringNameToValueMethod, typeName)
-	g.Printf(stringValuesMethod, typeName)
-	if len(runs) <= runsThreshold {
-		g.Printf(stringBelongsMethodLoop, typeName)
-	} else { // There is a map of values, the code is simpler then
-		g.Printf(stringBelongsMethodSet, typeName)
+	var n int
+	var runID string
+	for i, values := range runs {
+		if thereAreRuns {
+			runID = "_" + fmt.Sprintf("%d", i)
+			n = 0
+		} else {
+			runID = ""
+		}
+
+		for _, value := range values {
+			g.Printf("\t_%sName%s[%d:%d],\n", typeName, runID, n, n+len(value.name))
+			n += len(value.name)
+		}
 	}
+	g.Printf("}\n\n")
 }
 
 // Arguments to format are:

examples/gomods/README.md

@@ -0,0 +1,8 @@
+# Go Modules Sample
+
+## Steps
+
+ 1. Go get enumer `go get -u  git.internal/re/enumer`
+ 2. `go generate` This should create `pill_enumer.go`
+ 3. `go run  *.go` to see it in action
+ 4. `go mod tidy` to remove the deps for `enumer` once your happy.

examples/gomods/go.mod

@@ -0,0 +1,3 @@
+module github.com/dmarkham/gomods
+
+go 1.12

examples/gomods/main.go

@@ -0,0 +1,20 @@
+package main
+
+import "fmt"
+
+//go:generate go run git.internal/re/enumer -type=Pill -json
+type Pill int
+
+const (
+	Placebo Pill = iota
+	Aspirin
+	Ibuprofen
+	Paracetamol
+	Acetaminophen = Paracetamol
+)
+
+func main() {
+	fmt.Println(PillStrings())
+	fmt.Println(Placebo.IsAPill())
+	fmt.Println(Placebo)
+}

go.mod

@@ -1,8 +1,13 @@
-module github.com/alvaroloes/enumer
-
-go 1.12
+module git.internal/re/enumer
 
 require (
-	github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1
-	golang.org/x/tools v0.0.0-20190525145741-7be61e1b0e51
+	github.com/pascaldekloe/name v1.0.0
+	golang.org/x/tools v0.1.12
 )
+
+require (
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
+)
+
+go 1.17

go.sum

@@ -1,9 +1,28 @@
-github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1 h1:/I3lTljEEDNYLho3/FUB7iD/oc2cEFgVmbHzV+O0PtU=
-github.com/pascaldekloe/name v0.0.0-20180628100202-0fd16699aae1/go.mod h1:eD5JxqMiuNYyFNmyY9rkJ/slN8y59oEu4Ei7F8OoKWQ=
+github.com/pascaldekloe/name v1.0.0 h1:n7LKFgHixETzxpRv2R77YgPUFo85QHGZKrdaYm7eY5U=
+github.com/pascaldekloe/name v1.0.0/go.mod h1:Z//MfYJnH4jVpQ9wkclwu2I2MkHmXTlT9wR5UZScttM=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20190525145741-7be61e1b0e51 h1:RhYYBLDB5MoVkvoNGMNk+DSj7WoGhySvIvtEjTyiP74=
-golang.org/x/tools v0.0.0-20190525145741-7be61e1b0e51/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

gqlgen.go

@@ -0,0 +1,26 @@
+package main
+
+// Arguments to format are:
+//	[1]: type name
+const gqlgenMethods = `
+// MarshalGQL implements the graphql.Marshaler interface for %[1]s
+func (i %[1]s) MarshalGQL(w io.Writer) {
+	fmt.Fprint(w, strconv.Quote(i.String()))
+}
+
+// UnmarshalGQL implements the graphql.Unmarshaler interface for %[1]s
+func (i *%[1]s) UnmarshalGQL(value interface{}) error {
+	str, ok := value.(string)
+	if !ok {
+		return fmt.Errorf("%[1]s should be a string, got %%T", value)
+	}
+
+	var err error
+	*i, err = %[1]sString(str)
+	return err
+}
+`
+
+func (g *Generator) buildGQLGenMethods(runs [][]Value, typeName string) {
+	g.Printf(gqlgenMethods, typeName)
+}

sql.go

@@ -12,14 +12,16 @@ const scanMethod = `func (i *%[1]s) Scan(value interface{}) error {
 		return nil
 	}
 
-	str, ok := value.(string)
-	if !ok {
-		bytes, ok := value.([]byte)
-		if !ok {
-			return fmt.Errorf("value is not a byte slice")
-		}
-
-		str = string(bytes[:])
+	var str string
+	switch v := value.(type) {
+	case []byte:
+		str = string(v)
+	case string:
+		str = v
+	case fmt.Stringer:
+		str = v.String()
+	default:
+		return fmt.Errorf("invalid value of %[1]s: %%[1]T(%%[1]v)", value)
 	}
 
 	val, err := %[1]sString(str)

stringer.go

@@ -2,12 +2,10 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build go1.5
-
-//Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
-//It started as a fork of Rob Pike’s Stringer tool
+// Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
+// It started as a fork of Rob Pike’s Stringer tool
 //
-//Please visit http://github.com/alvaroloes/enumer for a comprehensive documentation
+// Please visit http://git.internal/re/enumer for a comprehensive documentation
 package main
 
 import (
@@ -20,13 +18,16 @@ import (
 	"go/importer"
 	"go/token"
 	"go/types"
-	"golang.org/x/tools/go/packages"
 	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
 	"sort"
 	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	"golang.org/x/tools/go/packages"
 
 	"github.com/pascaldekloe/name"
 )
@@ -48,10 +49,13 @@ var (
 	json            = flag.Bool("json", false, "if true, json marshaling methods will be generated. Default: false")
 	yaml            = flag.Bool("yaml", false, "if true, yaml marshaling methods will be generated. Default: false")
 	text            = flag.Bool("text", false, "if true, text marshaling methods will be generated. Default: false")
+	gqlgen          = flag.Bool("gqlgen", false, "if true, GraphQL marshaling methods for gqlgen will be generated. Default: false")
+	altValuesFunc   = flag.Bool("values", false, "if true, alternative string values method will be generated. Default: false")
 	output          = flag.String("output", "", "output file name; default srcdir/<type>_string.go")
 	transformMethod = flag.String("transform", "noop", "enum item name transformation method. Default: noop")
 	trimPrefix      = flag.String("trimprefix", "", "transform each item name by removing a prefix. Default: \"\"")
-	lineComment     = flag.Bool("linecomment", false, "use line comment text as printed text when present")
+	addPrefix       = flag.String("addprefix", "", "transform each item name by adding a prefix. Default: \"\"")
+	linecomment     = flag.Bool("linecomment", false, "use line comment text as printed text when present")
 )
 
 var comments arrayFlags
@@ -62,12 +66,13 @@ func init() {
 
 // Usage is a replacement usage function for the flags package.
 func Usage() {
-	fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
-	fmt.Fprintf(os.Stderr, "\tenumer [flags] -type T [directory]\n")
-	fmt.Fprintf(os.Stderr, "\tenumer [flags] -type T files... # Must be a single package\n")
-	fmt.Fprintf(os.Stderr, "For more information, see:\n")
-	fmt.Fprintf(os.Stderr, "\thttps://github.com/alvaroloes/enumer\n")
-	fmt.Fprintf(os.Stderr, "Flags:\n")
+	_, _ = fmt.Fprintf(os.Stderr, "Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).\n")
+	_, _ = fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
+	_, _ = fmt.Fprintf(os.Stderr, "\tEnumer [flags] -type T [directory]\n")
+	_, _ = fmt.Fprintf(os.Stderr, "\tEnumer [flags] -type T files... # Must be a single package\n")
+	_, _ = fmt.Fprintf(os.Stderr, "For more information, see:\n")
+	_, _ = fmt.Fprintf(os.Stderr, "\thttp://godoc.org/git.internal/re/enumer\n")
+	_, _ = fmt.Fprintf(os.Stderr, "Flags:\n")
 	flag.PrintDefaults()
 }
 
@@ -80,7 +85,7 @@ func main() {
 		flag.Usage()
 		os.Exit(2)
 	}
-	types := strings.Split(*typeNames, ",")
+	typs := strings.Split(*typeNames, ",")
 
 	// We accept either one directory or a list of files. Which do we have?
 	args := flag.Args()
@@ -97,31 +102,40 @@ func main() {
 
 	if len(args) == 1 && isDirectory(args[0]) {
 		dir = args[0]
+		// g.parsePackageDir(args[0])
 	} else {
 		dir = filepath.Dir(args[0])
+		// g.parsePackageFiles(args)
 	}
 
-	g.parsePackage(args)
+	g.parsePackage(args, []string{})
 
 	// Print the header and package clause.
 	g.Printf("// Code generated by \"enumer %s\"; DO NOT EDIT.\n", strings.Join(os.Args[1:], " "))
 	g.Printf("\n")
-	g.Printf("// %s\n", comments.String())
+	if comments.String() != "" {
+		g.Printf("// %s\n", comments.String())
+	}
 	g.Printf("package %s", g.pkg.name)
 	g.Printf("\n")
 	g.Printf("import (\n")
 	g.Printf("\t\"fmt\"\n")
+	g.Printf("\t\"strings\"\n")
 	if *sql {
 		g.Printf("\t\"database/sql/driver\"\n")
 	}
 	if *json {
 		g.Printf("\t\"encoding/json\"\n")
 	}
+	if *gqlgen {
+		g.Printf("\t\"io\"\n")
+		g.Printf("\t\"strconv\"\n")
+	}
 	g.Printf(")\n")
 
 	// Run generate for each type.
-	for _, typeName := range types {
-		g.generate(typeName, *json, *yaml, *sql, *text, *transformMethod, *trimPrefix, *lineComment)
+	for _, typeName := range typs {
+		g.generate(typeName, *json, *yaml, *sql, *text, *gqlgen, *transformMethod, *trimPrefix, *addPrefix, *linecomment, *altValuesFunc)
 	}
 
 	// Format the output.
@@ -130,13 +144,12 @@ func main() {
 	// Figure out filename to write to
 	outputName := *output
 	if outputName == "" {
-		baseName := fmt.Sprintf("%s_enumer.go", types[0])
+		baseName := fmt.Sprintf("%s_enumer.go", typs[0])
 		outputName = filepath.Join(dir, strings.ToLower(baseName))
 	}
 
 	// Write to tmpfile first
-	tmpName := fmt.Sprintf("%s_enumer_", filepath.Base(types[0]))
-	tmpFile, err := ioutil.TempFile(filepath.Dir(types[0]), tmpName)
+	tmpFile, err := ioutil.TempFile(dir, fmt.Sprintf("%s_enumer_", typs[0]))
 	if err != nil {
 		log.Fatalf("creating temporary file for output: %s", err)
 	}
@@ -173,7 +186,7 @@ type Generator struct {
 
 // Printf prints the string to the output
 func (g *Generator) Printf(format string, args ...interface{}) {
-	fmt.Fprintf(&g.buf, format, args...)
+	_, _ = fmt.Fprintf(&g.buf, format, args...)
 }
 
 // File holds a single parsed file and associated data.
@@ -181,8 +194,10 @@ type File struct {
 	pkg  *Package  // Package to which this file belongs.
 	file *ast.File // Parsed AST.
 	// These fields are reset for each type being generated.
-	typeName string  // Name of the constant type.
-	values   []Value // Accumulator for constant values of that type.
+	typeName    string  // Name of the constant type.
+	values      []Value // Accumulator for constant values of that type.
+	trimPrefix  string
+	lineComment bool
 }
 
 // Package holds information about a Go package
@@ -194,75 +209,43 @@ type Package struct {
 	typesPkg *types.Package
 }
 
-//// parsePackageDir parses the package residing in the directory.
-//func (g *Generator) parsePackageDir(directory string) {
-//	pkg, err := build.Default.ImportDir(directory, 0)
-//	if err != nil {
-//		log.Fatalf("cannot process directory %s: %s", directory, err)
-//	}
-//	var names []string
-//	names = append(names, pkg.GoFiles...)
-//	names = append(names, pkg.CgoFiles...)
-//	// TODO: Need to think about constants in test files. Maybe write type_string_test.go
-//	// in a separate pass? For later.
-//	// names = append(names, pkg.TestGoFiles...) // These are also in the "foo" package.
-//	names = append(names, pkg.SFiles...)
-//	names = prefixDirectory(directory, names)
-//	g.parsePackage(directory, names, nil)
-//}
+// // parsePackageDir parses the package residing in the directory.
+// func (g *Generator) parsePackageDir(directory string) {
+// 	pkg, err := build.Default.ImportDir(directory, 0)
+// 	if err != nil {
+// 		log.Fatalf("cannot process directory %s: %s", directory, err)
+// 	}
+// 	var names []string
+// 	names = append(names, pkg.GoFiles...)
+// 	names = append(names, pkg.CgoFiles...)
+// 	// TODO: Need to think about constants in test files. Maybe write type_string_test.go
+// 	// in a separate pass? For later.
+// 	// names = append(names, pkg.TestGoFiles...) // These are also in the "foo" package.
+// 	names = append(names, pkg.SFiles...)
+// 	names = prefixDirectory(directory, names)
+// 	g.parsePackage(directory, names, nil)
+// }
 //
-//// parsePackageFiles parses the package occupying the named files.
-//func (g *Generator) parsePackageFiles(names []string) {
-//	g.parsePackage(".", names, nil)
-//}
-//
-//// prefixDirectory places the directory name on the beginning of each name in the list.
-//func prefixDirectory(directory string, names []string) []string {
-//	if directory == "." {
-//		return names
-//	}
-//	ret := make([]string, len(names))
-//	for i, name := range names {
-//		ret[i] = filepath.Join(directory, name)
-//	}
-//	return ret
-//}
+// // parsePackageFiles parses the package occupying the named files.
+// func (g *Generator) parsePackageFiles(names []string) {
+// 	g.parsePackage(".", names, nil)
+// }
 
-//// parsePackage analyzes the single package constructed from the named files.
-//// If text is non-nil, it is a string to be used instead of the content of the file,
-//// to be used for testing. parsePackage exits if there is an error.
-//func (g *Generator) parsePackage(directory string, names []string, text interface{}) {
-//	var files []*File
-//	var astFiles []*ast.File
-//	g.pkg = new(Package)
-//	fs := token.NewFileSet()
-//	for _, name := range names {
-//		if !strings.HasSuffix(name, ".go") {
-//			continue
-//		}
-//		parsedFile, err := parser.ParseFile(fs, name, text, 0)
-//		if err != nil {
-//			log.Fatalf("parsing package: %s: %s", name, err)
-//		}
-//		astFiles = append(astFiles, parsedFile)
-//		files = append(files, &File{
-//			file: parsedFile,
-//			pkg:  g.pkg,
-//		})
-//	}
-//	if len(astFiles) == 0 {
-//		log.Fatalf("%s: no buildable Go files", directory)
-//	}
-//	g.pkg.name = astFiles[0].Name.Name
-//	g.pkg.files = files
-//	g.pkg.dir = directory
-//	// Type check the package.
-//	g.pkg.check(fs, astFiles)
-//}
+// // prefixDirectory places the directory name on the beginning of each name in the list.
+// func prefixDirectory(directory string, names []string) []string {
+// 	if directory == "." {
+// 		return names
+// 	}
+// 	ret := make([]string, len(names))
+// 	for i, n := range names {
+// 		ret[i] = filepath.Join(directory, n)
+// 	}
+// 	return ret
+// }
 
 // parsePackage analyzes the single package constructed from the patterns and tags.
 // parsePackage exits if there is an error.
-func (g *Generator) parsePackage(patterns []string) {
+func (g *Generator) parsePackage(patterns []string, tags []string) {
 	cfg := &packages.Config{
 		Mode: packages.LoadSyntax,
 		// TODO: Need to think about constants in test files. Maybe write type_string_test.go
@@ -295,6 +278,38 @@ func (g *Generator) addPackage(pkg *packages.Package) {
 	}
 }
 
+// parsePackage analyzes the single package constructed from the named files.
+// If text is non-nil, it is a string to be used instead of the content of the file,
+// to be used for testing. parsePackage exits if there is an error.
+// func (g *Generator) parsePackagee(directory string, names []string, text interface{}) {
+// 	var files []*File
+// 	var astFiles []*ast.File
+// 	g.pkg = new(Package)
+// 	fs := token.NewFileSet()
+// 	for _, n := range names {
+// 		if !strings.HasSuffix(n, ".go") {
+// 			continue
+// 		}
+// 		parsedFile, err := parser.ParseFile(fs, n, text, 0)
+// 		if err != nil {
+// 			log.Fatalf("parsing package: %s: %s", n, err)
+// 		}
+// 		astFiles = append(astFiles, parsedFile)
+// 		files = append(files, &File{
+// 			file: parsedFile,
+// 			pkg:  g.pkg,
+// 		})
+// 	}
+// 	if len(astFiles) == 0 {
+// 		log.Fatalf("%s: no buildable Go files", directory)
+// 	}
+// 	g.pkg.name = astFiles[0].Name.Name
+// 	g.pkg.files = files
+// 	g.pkg.dir = directory
+// 	// Type check the package.
+// 	g.pkg.check(fs, astFiles)
+// }
+
 // check type-checks the package. The package must be OK to proceed.
 func (pkg *Package) check(fs *token.FileSet, astFiles []*ast.File) {
 	pkg.defs = make(map[*ast.Ident]types.Object)
@@ -310,26 +325,76 @@ func (pkg *Package) check(fs *token.FileSet, astFiles []*ast.File) {
 }
 
 func (g *Generator) transformValueNames(values []Value, transformMethod string) {
-	var sep rune
+	var fn func(src string) string
 	switch transformMethod {
 	case "snake":
-		sep = '_'
-	case "kebab":
-		sep = '-'
-	case "phrase":
-		sep = ' '
-	case "macro":
-		sep = '_'
-		for i := range values {
-			values[i].name = strings.ToUpper(name.Delimit(values[i].name, sep))
+		fn = func(s string) string {
+			return strings.ToLower(name.Delimit(s, '_'))
+		}
+	case "snake_upper", "snake-upper":
+		fn = func(s string) string {
+			return strings.ToUpper(name.Delimit(s, '_'))
+		}
+	case "kebab":
+		fn = func(s string) string {
+			return strings.ToLower(name.Delimit(s, '-'))
+		}
+	case "kebab_upper", "kebab-upper":
+		fn = func(s string) string {
+			return strings.ToUpper(name.Delimit(s, '-'))
+		}
+	case "upper":
+		fn = func(s string) string {
+			return strings.ToUpper(s)
+		}
+	case "lower":
+		fn = func(s string) string {
+			return strings.ToLower(s)
+		}
+	case "title":
+		fn = func(s string) string {
+			return strings.Title(s)
+		}
+	case "title-lower":
+		fn = func(s string) string {
+			title := []rune(strings.Title(s))
+			title[0] = unicode.ToLower(title[0])
+			return string(title)
+		}
+	case "first":
+		fn = func(s string) string {
+			r, _ := utf8.DecodeRuneInString(s)
+			return string(r)
+		}
+	case "first_upper", "first-upper":
+		fn = func(s string) string {
+			r, _ := utf8.DecodeRuneInString(s)
+			return strings.ToUpper(string(r))
+		}
+	case "first_lower", "first-lower":
+		fn = func(s string) string {
+			r, _ := utf8.DecodeRuneInString(s)
+			return strings.ToLower(string(r))
+		}
+	case "whitespace":
+		fn = func(s string) string {
+			return strings.ToLower(name.Delimit(s, ' '))
 		}
-		return
 	default:
 		return
 	}
 
-	for i := range values {
-		values[i].name = strings.ToLower(name.Delimit(values[i].name, sep))
+	for i, v := range values {
+		after := fn(v.name)
+		// If the original one was "" or the one before the transformation
+		// was "" (most commonly if linecomment defines it as empty) we
+		// do not care if it's empty.
+		// But if any of them was not empty before then it means that
+		// the transformed emptied the value
+		if v.originalName != "" && v.name != "" && after == "" {
+			log.Fatalf("transformation of %q (%s) got an empty result", v.name, v.originalName)
+		}
+		values[i].name = after
 	}
 }
 
@@ -340,18 +405,20 @@ func (g *Generator) trimValueNames(values []Value, prefix string) {
 	}
 }
 
-func (g *Generator) replaceValuesWithLineComment(values []Value) {
-	for i, val := range values {
-		if val.comment != "" {
-			values[i].name = val.comment
-		}
+// prefixValueNames adds a prefix to each name
+func (g *Generator) prefixValueNames(values []Value, prefix string) {
+	for i := range values {
+		values[i].name = prefix + values[i].name
 	}
 }
 
 // generate produces the String method for the named type.
-func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeSQL, includeText bool, transformMethod string, trimPrefix string, lineComment bool) {
+func (g *Generator) generate(typeName string,
+	includeJSON, includeYAML, includeSQL, includeText, includeGQLGen bool,
+	transformMethod string, trimPrefix string, addPrefix string, lineComment bool, includeValuesMethod bool) {
 	values := make([]Value, 0, 100)
 	for _, file := range g.pkg.files {
+		file.lineComment = lineComment
 		// Set the state for this run of the walker.
 		file.typeName = typeName
 		file.values = nil
@@ -365,13 +432,13 @@ func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeS
 		log.Fatalf("no values defined for type %s", typeName)
 	}
 
-	g.trimValueNames(values, trimPrefix)
+	for _, prefix := range strings.Split(trimPrefix, ",") {
+		g.trimValueNames(values, prefix)
+	}
 
 	g.transformValueNames(values, transformMethod)
 
-	if lineComment {
-		g.replaceValuesWithLineComment(values)
-	}
+	g.prefixValueNames(values, addPrefix)
 
 	runs := splitIntoRuns(values)
 	// The decision of which pattern to use depends on the number of
@@ -395,6 +462,11 @@ func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeS
 	default:
 		g.buildMap(runs, typeName)
 	}
+	if includeValuesMethod {
+		g.buildAltStringValuesMethod(typeName)
+	}
+
+	g.buildNoOpOrderChangeDetect(runs, typeName)
 
 	g.buildBasicExtras(runs, typeName, runsThreshold)
 	if includeJSON {
@@ -409,6 +481,9 @@ func (g *Generator) generate(typeName string, includeJSON, includeYAML, includeS
 	if includeSQL {
 		g.addValueAndScanMethod(typeName)
 	}
+	if includeGQLGen {
+		g.buildGQLGenMethods(runs, typeName)
+	}
 }
 
 // splitIntoRuns breaks the values into runs of contiguous sequences.
@@ -458,16 +533,16 @@ func (g *Generator) format() []byte {
 
 // Value represents a declared constant.
 type Value struct {
-	name string // The name of the constant after transformation (i.e. camel case => snake case)
+	originalName string // The name of the constant before transformation
+	name         string // The name of the constant after transformation (i.e. camel case => snake case)
 	// The value is stored as a bit pattern alone. The boolean tells us
 	// whether to interpret it as an int64 or a uint64; the only place
 	// this matters is when sorting.
 	// Much of the time the str field is all we need; it is printed
 	// by Value.String.
-	value   uint64 // Will be converted to int64 when needed.
-	signed  bool   // Whether the constant is a signed type.
-	str     string // The string representation given by the "go/exact" package.
-	comment string // The comment on the right of the constant
+	value  uint64 // Will be converted to int64 when needed.
+	signed bool   // Whether the constant is a signed type.
+	str    string // The string representation given by the "go/exact" package.
 }
 
 func (v *Value) String() string {
@@ -525,16 +600,16 @@ func (f *File) genDecl(node ast.Node) bool {
 		// We now have a list of names (from one line of source code) all being
 		// declared with the desired type.
 		// Grab their names and actual values and store them in f.values.
-		for _, name := range vspec.Names {
-			if name.Name == "_" {
+		for _, n := range vspec.Names {
+			if n.Name == "_" {
 				continue
 			}
 			// This dance lets the type checker find the values for us. It's a
-			// bit tricky: look up the object declared by the name, find its
+			// bit tricky: look up the object declared by the n, find its
 			// types.Const, and extract its value.
-			obj, ok := f.pkg.defs[name]
+			obj, ok := f.pkg.defs[n]
 			if !ok {
-				log.Fatalf("no value for constant %s", name)
+				log.Fatalf("no value for constant %s", n)
 			}
 			info := obj.Type().Underlying().(*types.Basic).Info()
 			if info&types.IsInteger == 0 {
@@ -542,28 +617,27 @@ func (f *File) genDecl(node ast.Node) bool {
 			}
 			value := obj.(*types.Const).Val() // Guaranteed to succeed as this is CONST.
 			if value.Kind() != exact.Int {
-				log.Fatalf("can't happen: constant is not an integer %s", name)
+				log.Fatalf("can't happen: constant is not an integer %s", n)
 			}
 			i64, isInt := exact.Int64Val(value)
 			u64, isUint := exact.Uint64Val(value)
 			if !isInt && !isUint {
-				log.Fatalf("internal error: value of %s is not an integer: %s", name, value.String())
+				log.Fatalf("internal error: value of %s is not an integer: %s", n, value.String())
 			}
 			if !isInt {
 				u64 = uint64(i64)
 			}
-			comment := ""
-			if c := vspec.Comment; c != nil && len(c.List) == 1 {
-				comment = strings.TrimSpace(c.Text())
+			v := Value{
+				originalName: n.Name,
+				name:         n.Name,
+				value:        u64,
+				signed:       info&types.IsUnsigned == 0,
+				str:          value.String(),
+			}
+			if c := vspec.Comment; f.lineComment && c != nil && len(c.List) == 1 {
+				v.name = strings.TrimSpace(c.Text())
 			}
 
-			v := Value{
-				name:    name.Name,
-				value:   u64,
-				signed:  info&types.IsUnsigned == 0,
-				str:     value.String(),
-				comment: comment,
-			}
 			f.values = append(f.values, v)
 		}
 	}
@@ -592,13 +666,15 @@ func usize(n int) int {
 func (g *Generator) declareIndexAndNameVars(runs [][]Value, typeName string) {
 	var indexes, names []string
 	for i, run := range runs {
-		index, name := g.createIndexAndNameDecl(run, typeName, fmt.Sprintf("_%d", i))
+		index, n := g.createIndexAndNameDecl(run, typeName, fmt.Sprintf("_%d", i))
 		indexes = append(indexes, index)
-		names = append(names, name)
+		names = append(names, n)
+		_, n = g.createLowerIndexAndNameDecl(run, typeName, fmt.Sprintf("_%d", i))
+		names = append(names, n)
 	}
 	g.Printf("const (\n")
-	for _, name := range names {
-		g.Printf("\t%s\n", name)
+	for _, n := range names {
+		g.Printf("\t%s\n", n)
 	}
 	g.Printf(")\n\n")
 	g.Printf("var (")
@@ -610,9 +686,34 @@ func (g *Generator) declareIndexAndNameVars(runs [][]Value, typeName string) {
 
 // declareIndexAndNameVar is the single-run version of declareIndexAndNameVars
 func (g *Generator) declareIndexAndNameVar(run []Value, typeName string) {
-	index, name := g.createIndexAndNameDecl(run, typeName, "")
-	g.Printf("const %s\n", name)
+	index, n := g.createIndexAndNameDecl(run, typeName, "")
+	g.Printf("const %s\n", n)
 	g.Printf("var %s\n", index)
+	index, n = g.createLowerIndexAndNameDecl(run, typeName, "")
+	g.Printf("const %s\n", n)
+	//g.Printf("var %s\n", index)
+}
+
+// createIndexAndNameDecl returns the pair of declarations for the run. The caller will add "const" and "var".
+func (g *Generator) createLowerIndexAndNameDecl(run []Value, typeName string, suffix string) (string, string) {
+	b := new(bytes.Buffer)
+	indexes := make([]int, len(run))
+	for i := range run {
+		b.WriteString(strings.ToLower(run[i].name))
+		indexes[i] = b.Len()
+	}
+	nameConst := fmt.Sprintf("_%sLowerName%s = %q", typeName, suffix, b.String())
+	nameLen := b.Len()
+	b.Reset()
+	_, _ = fmt.Fprintf(b, "_%sLowerIndex%s = [...]uint%d{0, ", typeName, suffix, usize(nameLen))
+	for i, v := range indexes {
+		if i > 0 {
+			_, _ = fmt.Fprintf(b, ", ")
+		}
+		_, _ = fmt.Fprintf(b, "%d", v)
+	}
+	_, _ = fmt.Fprintf(b, "}")
+	return b.String(), nameConst
 }
 
 // createIndexAndNameDecl returns the pair of declarations for the run. The caller will add "const" and "var".
@@ -626,14 +727,14 @@ func (g *Generator) createIndexAndNameDecl(run []Value, typeName string, suffix
 	nameConst := fmt.Sprintf("_%sName%s = %q", typeName, suffix, b.String())
 	nameLen := b.Len()
 	b.Reset()
-	fmt.Fprintf(b, "_%sIndex%s = [...]uint%d{0, ", typeName, suffix, usize(nameLen))
+	_, _ = fmt.Fprintf(b, "_%sIndex%s = [...]uint%d{0, ", typeName, suffix, usize(nameLen))
 	for i, v := range indexes {
 		if i > 0 {
-			fmt.Fprintf(b, ", ")
+			_, _ = fmt.Fprintf(b, ", ")
 		}
-		fmt.Fprintf(b, "%d", v)
+		_, _ = fmt.Fprintf(b, "%d", v)
 	}
-	fmt.Fprintf(b, "}")
+	_, _ = fmt.Fprintf(b, "}")
 	return b.String(), nameConst
 }
 
@@ -646,6 +747,13 @@ func (g *Generator) declareNameVars(runs [][]Value, typeName string, suffix stri
 		}
 	}
 	g.Printf("\"\n")
+	g.Printf("const _%sLowerName%s = \"", typeName, suffix)
+	for _, run := range runs {
+		for i := range run {
+			g.Printf("%s", strings.ToLower(run[i].name))
+		}
+	}
+	g.Printf("\"\n")
 }
 
 // buildOneRun generates the variables and String method for a single run of contiguous values.
@@ -666,9 +774,9 @@ func (g *Generator) buildOneRun(runs [][]Value, typeName string) {
 }
 
 // Arguments to format are:
-//	[1]: type name
-//	[2]: size of index element (8 for uint8 etc.)
-//	[3]: less than zero check (for signed types)
+// 	[1]: type name
+// 	[2]: size of index element (8 for uint8 etc.)
+// 	[3]: less than zero check (for signed types)
 const stringOneRun = `func (i %[1]s) String() string {
 	if %[3]si >= %[1]s(len(_%[1]sIndex)-1) {
 		return fmt.Sprintf("%[1]s(%%d)", i)
@@ -678,12 +786,10 @@ const stringOneRun = `func (i %[1]s) String() string {
 `
 
 // Arguments to format are:
-//	[1]: type name
-//	[2]: lowest defined value for type, as a string
-//	[3]: size of index element (8 for uint8 etc.)
-//	[4]: less than zero check (for signed types)
-/*
- */
+// 	[1]: type name
+// 	[2]: lowest defined value for type, as a string
+// 	[3]: size of index element (8 for uint8 etc.)
+// 	[4]: less than zero check (for signed types)
 const stringOneRunWithOffset = `func (i %[1]s) String() string {
 	i -= %[2]s
 	if %[4]si >= %[1]s(len(_%[1]sIndex)-1) {
@@ -736,6 +842,24 @@ func (g *Generator) buildMap(runs [][]Value, typeName string) {
 	g.Printf(stringMap, typeName)
 }
 
+// buildNoOpOrderChangeDetect try to let the compiler and the user know if the order/value of the ENUMS have changed.
+func (g *Generator) buildNoOpOrderChangeDetect(runs [][]Value, typeName string) {
+	g.Printf("\n")
+
+	g.Printf(`
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	`)
+	g.Printf("func _%sNoOp (){ ", typeName)
+	g.Printf("\n var x [1]struct{}\n")
+	for _, values := range runs {
+		for _, value := range values {
+			g.Printf("\t_ = x[%s-(%s)]\n", value.originalName, value.str)
+		}
+	}
+	g.Printf("}\n\n")
+}
+
 // Argument to format is the type name.
 const stringMap = `func (i %[1]s) String() string {
 	if str, ok := _%[1]sMap[i]; ok {

testdata/day.go

@@ -30,6 +30,9 @@ func main() {
 	ck(Sunday, "Sunday")
 	ck(-127, "Day(-127)")
 	ck(127, "Day(127)")
+	ckDayString(Sunday, "Sunday")
+	ckDayString(Sunday, "sunday")
+
 }
 
 func ck(day Day, str string) {
@@ -37,3 +40,14 @@ func ck(day Day, str string) {
 		panic("day.go: " + str)
 	}
 }
+
+func ckDayString(day Day, str string) {
+	d, err := DayString(str)
+	if err != nil {
+		panic("day.go: " + err.Error())
+	}
+	if d != day {
+		panic("day.go: " + str)
+
+	}
+}

testdata/day.golden

@@ -0,0 +1,94 @@
+
+const _DayName = "MondayTuesdayWednesdayThursdayFridaySaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 6, 13, 22, 30, 36, 44, 50}
+
+const _DayLowerName = "mondaytuesdaywednesdaythursdayfridaysaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+func (Day) Values() []string {
+	return DayStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[Monday-(0)]
+	_ = x[Tuesday-(1)]
+	_ = x[Wednesday-(2)]
+	_ = x[Thursday-(3)]
+	_ = x[Friday-(4)]
+	_ = x[Saturday-(5)]
+	_ = x[Sunday-(6)]
+}
+
+var _DayValues = []Day{Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:6]:        Monday,
+	_DayLowerName[0:6]:   Monday,
+	_DayName[6:13]:       Tuesday,
+	_DayLowerName[6:13]:  Tuesday,
+	_DayName[13:22]:      Wednesday,
+	_DayLowerName[13:22]: Wednesday,
+	_DayName[22:30]:      Thursday,
+	_DayLowerName[22:30]: Thursday,
+	_DayName[30:36]:      Friday,
+	_DayLowerName[30:36]: Friday,
+	_DayName[36:44]:      Saturday,
+	_DayLowerName[36:44]: Saturday,
+	_DayName[44:50]:      Sunday,
+	_DayLowerName[44:50]: Sunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:6],
+	_DayName[6:13],
+	_DayName[13:22],
+	_DayName[22:30],
+	_DayName[30:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/dayTrimAndPrefix.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "NightMondayNightTuesdayNightWednesdayNightThursdayNightFridayNightSaturdayNightSunday"
+
+var _DayIndex = [...]uint8{0, 11, 23, 37, 50, 61, 74, 85}
+
+const _DayLowerName = "nightmondaynighttuesdaynightwednesdaynightthursdaynightfridaynightsaturdaynightsunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[DayMonday-(0)]
+	_ = x[DayTuesday-(1)]
+	_ = x[DayWednesday-(2)]
+	_ = x[DayThursday-(3)]
+	_ = x[DayFriday-(4)]
+	_ = x[DaySaturday-(5)]
+	_ = x[DaySunday-(6)]
+}
+
+var _DayValues = []Day{DayMonday, DayTuesday, DayWednesday, DayThursday, DayFriday, DaySaturday, DaySunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:11]:       DayMonday,
+	_DayLowerName[0:11]:  DayMonday,
+	_DayName[11:23]:      DayTuesday,
+	_DayLowerName[11:23]: DayTuesday,
+	_DayName[23:37]:      DayWednesday,
+	_DayLowerName[23:37]: DayWednesday,
+	_DayName[37:50]:      DayThursday,
+	_DayLowerName[37:50]: DayThursday,
+	_DayName[50:61]:      DayFriday,
+	_DayLowerName[50:61]: DayFriday,
+	_DayName[61:74]:      DaySaturday,
+	_DayLowerName[61:74]: DaySaturday,
+	_DayName[74:85]:      DaySunday,
+	_DayLowerName[74:85]: DaySunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:11],
+	_DayName[11:23],
+	_DayName[23:37],
+	_DayName[37:50],
+	_DayName[50:61],
+	_DayName[61:74],
+	_DayName[74:85],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/dayWithLinecomment.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "lunesTuesdayWednesdayThursdayviernesSaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 5, 12, 21, 29, 36, 44, 50}
+
+const _DayLowerName = "lunestuesdaywednesdaythursdayviernessaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[Monday-(0)]
+	_ = x[Tuesday-(1)]
+	_ = x[Wednesday-(2)]
+	_ = x[Thursday-(3)]
+	_ = x[Friday-(4)]
+	_ = x[Saturday-(5)]
+	_ = x[Sunday-(6)]
+}
+
+var _DayValues = []Day{Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:5]:        Monday,
+	_DayLowerName[0:5]:   Monday,
+	_DayName[5:12]:       Tuesday,
+	_DayLowerName[5:12]:  Tuesday,
+	_DayName[12:21]:      Wednesday,
+	_DayLowerName[12:21]: Wednesday,
+	_DayName[21:29]:      Thursday,
+	_DayLowerName[21:29]: Thursday,
+	_DayName[29:36]:      Friday,
+	_DayLowerName[29:36]: Friday,
+	_DayName[36:44]:      Saturday,
+	_DayLowerName[36:44]: Saturday,
+	_DayName[44:50]:      Sunday,
+	_DayLowerName[44:50]: Sunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:5],
+	_DayName[5:12],
+	_DayName[12:21],
+	_DayName[21:29],
+	_DayName[29:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/dayWithPrefix.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "DayMondayDayTuesdayDayWednesdayDayThursdayDayFridayDaySaturdayDaySunday"
+
+var _DayIndex = [...]uint8{0, 9, 19, 31, 42, 51, 62, 71}
+
+const _DayLowerName = "daymondaydaytuesdaydaywednesdaydaythursdaydayfridaydaysaturdaydaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[Monday-(0)]
+	_ = x[Tuesday-(1)]
+	_ = x[Wednesday-(2)]
+	_ = x[Thursday-(3)]
+	_ = x[Friday-(4)]
+	_ = x[Saturday-(5)]
+	_ = x[Sunday-(6)]
+}
+
+var _DayValues = []Day{Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:9]:        Monday,
+	_DayLowerName[0:9]:   Monday,
+	_DayName[9:19]:       Tuesday,
+	_DayLowerName[9:19]:  Tuesday,
+	_DayName[19:31]:      Wednesday,
+	_DayLowerName[19:31]: Wednesday,
+	_DayName[31:42]:      Thursday,
+	_DayLowerName[31:42]: Thursday,
+	_DayName[42:51]:      Friday,
+	_DayLowerName[42:51]: Friday,
+	_DayName[51:62]:      Saturday,
+	_DayLowerName[51:62]: Saturday,
+	_DayName[62:71]:      Sunday,
+	_DayLowerName[62:71]: Sunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:9],
+	_DayName[9:19],
+	_DayName[19:31],
+	_DayName[31:42],
+	_DayName[42:51],
+	_DayName[51:62],
+	_DayName[62:71],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/gap.golden

@@ -0,0 +1,115 @@
+
+const (
+	_GapName_0      = "TwoThree"
+	_GapLowerName_0 = "twothree"
+	_GapName_1      = "FiveSixSevenEightNine"
+	_GapLowerName_1 = "fivesixseveneightnine"
+	_GapName_2      = "Eleven"
+	_GapLowerName_2 = "eleven"
+)
+
+var (
+	_GapIndex_0 = [...]uint8{0, 3, 8}
+	_GapIndex_1 = [...]uint8{0, 4, 7, 12, 17, 21}
+	_GapIndex_2 = [...]uint8{0, 6}
+)
+
+func (i Gap) String() string {
+	switch {
+	case 2 <= i && i <= 3:
+		i -= 2
+		return _GapName_0[_GapIndex_0[i]:_GapIndex_0[i+1]]
+	case 5 <= i && i <= 9:
+		i -= 5
+		return _GapName_1[_GapIndex_1[i]:_GapIndex_1[i+1]]
+	case i == 11:
+		return _GapName_2
+	default:
+		return fmt.Sprintf("Gap(%d)", i)
+	}
+}
+
+func (Gap) Values() []string {
+	return GapStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _GapNoOp() {
+	var x [1]struct{}
+	_ = x[Two-(2)]
+	_ = x[Three-(3)]
+	_ = x[Five-(5)]
+	_ = x[Six-(6)]
+	_ = x[Seven-(7)]
+	_ = x[Eight-(8)]
+	_ = x[Nine-(9)]
+	_ = x[Eleven-(11)]
+}
+
+var _GapValues = []Gap{Two, Three, Five, Six, Seven, Eight, Nine, Eleven}
+
+var _GapNameToValueMap = map[string]Gap{
+	_GapName_0[0:3]:        Two,
+	_GapLowerName_0[0:3]:   Two,
+	_GapName_0[3:8]:        Three,
+	_GapLowerName_0[3:8]:   Three,
+	_GapName_1[0:4]:        Five,
+	_GapLowerName_1[0:4]:   Five,
+	_GapName_1[4:7]:        Six,
+	_GapLowerName_1[4:7]:   Six,
+	_GapName_1[7:12]:       Seven,
+	_GapLowerName_1[7:12]:  Seven,
+	_GapName_1[12:17]:      Eight,
+	_GapLowerName_1[12:17]: Eight,
+	_GapName_1[17:21]:      Nine,
+	_GapLowerName_1[17:21]: Nine,
+	_GapName_2[0:6]:        Eleven,
+	_GapLowerName_2[0:6]:   Eleven,
+}
+
+var _GapNames = []string{
+	_GapName_0[0:3],
+	_GapName_0[3:8],
+	_GapName_1[0:4],
+	_GapName_1[4:7],
+	_GapName_1[7:12],
+	_GapName_1[12:17],
+	_GapName_1[17:21],
+	_GapName_2[0:6],
+}
+
+// GapString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func GapString(s string) (Gap, error) {
+	if val, ok := _GapNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _GapNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Gap values", s)
+}
+
+// GapValues returns all values of the enum
+func GapValues() []Gap {
+	return _GapValues
+}
+
+// GapStrings returns a slice of all String values of the enum
+func GapStrings() []string {
+	strs := make([]string, len(_GapNames))
+	copy(strs, _GapNames)
+	return strs
+}
+
+// IsAGap returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Gap) IsAGap() bool {
+	for _, v := range _GapValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/num.golden

@@ -0,0 +1,87 @@
+
+const _NumName = "m_2m_1m0m1m2"
+
+var _NumIndex = [...]uint8{0, 3, 6, 8, 10, 12}
+
+const _NumLowerName = "m_2m_1m0m1m2"
+
+func (i Num) String() string {
+	i -= -2
+	if i < 0 || i >= Num(len(_NumIndex)-1) {
+		return fmt.Sprintf("Num(%d)", i+-2)
+	}
+	return _NumName[_NumIndex[i]:_NumIndex[i+1]]
+}
+
+func (Num) Values() []string {
+	return NumStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _NumNoOp() {
+	var x [1]struct{}
+	_ = x[m_2-(-2)]
+	_ = x[m_1-(-1)]
+	_ = x[m0-(0)]
+	_ = x[m1-(1)]
+	_ = x[m2-(2)]
+}
+
+var _NumValues = []Num{m_2, m_1, m0, m1, m2}
+
+var _NumNameToValueMap = map[string]Num{
+	_NumName[0:3]:        m_2,
+	_NumLowerName[0:3]:   m_2,
+	_NumName[3:6]:        m_1,
+	_NumLowerName[3:6]:   m_1,
+	_NumName[6:8]:        m0,
+	_NumLowerName[6:8]:   m0,
+	_NumName[8:10]:       m1,
+	_NumLowerName[8:10]:  m1,
+	_NumName[10:12]:      m2,
+	_NumLowerName[10:12]: m2,
+}
+
+var _NumNames = []string{
+	_NumName[0:3],
+	_NumName[3:6],
+	_NumName[6:8],
+	_NumName[8:10],
+	_NumName[10:12],
+}
+
+// NumString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func NumString(s string) (Num, error) {
+	if val, ok := _NumNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _NumNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Num values", s)
+}
+
+// NumValues returns all values of the enum
+func NumValues() []Num {
+	return _NumValues
+}
+
+// NumStrings returns a slice of all String values of the enum
+func NumStrings() []string {
+	strs := make([]string, len(_NumNames))
+	copy(strs, _NumNames)
+	return strs
+}
+
+// IsANum returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Num) IsANum() bool {
+	for _, v := range _NumValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/offset.golden

@@ -0,0 +1,79 @@
+
+const _NumberName = "OneTwoThree"
+
+var _NumberIndex = [...]uint8{0, 3, 6, 11}
+
+const _NumberLowerName = "onetwothree"
+
+func (i Number) String() string {
+	i -= 1
+	if i < 0 || i >= Number(len(_NumberIndex)-1) {
+		return fmt.Sprintf("Number(%d)", i+1)
+	}
+	return _NumberName[_NumberIndex[i]:_NumberIndex[i+1]]
+}
+
+func (Number) Values() []string {
+	return NumberStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _NumberNoOp() {
+	var x [1]struct{}
+	_ = x[One-(1)]
+	_ = x[Two-(2)]
+	_ = x[Three-(3)]
+}
+
+var _NumberValues = []Number{One, Two, Three}
+
+var _NumberNameToValueMap = map[string]Number{
+	_NumberName[0:3]:       One,
+	_NumberLowerName[0:3]:  One,
+	_NumberName[3:6]:       Two,
+	_NumberLowerName[3:6]:  Two,
+	_NumberName[6:11]:      Three,
+	_NumberLowerName[6:11]: Three,
+}
+
+var _NumberNames = []string{
+	_NumberName[0:3],
+	_NumberName[3:6],
+	_NumberName[6:11],
+}
+
+// NumberString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func NumberString(s string) (Number, error) {
+	if val, ok := _NumberNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _NumberNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Number values", s)
+}
+
+// NumberValues returns all values of the enum
+func NumberValues() []Number {
+	return _NumberValues
+}
+
+// NumberStrings returns a slice of all String values of the enum
+func NumberStrings() []string {
+	strs := make([]string, len(_NumberNames))
+	copy(strs, _NumberNames)
+	return strs
+}
+
+// IsANumber returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Number) IsANumber() bool {
+	for _, v := range _NumberValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/prime.golden

@@ -0,0 +1,127 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+func (Prime) Values() []string {
+	return PrimeStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}

testdata/primeGQLGen.golden

@@ -0,0 +1,140 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalGQL implements the graphql.Marshaler interface for Prime
+func (i Prime) MarshalGQL(w io.Writer) {
+	fmt.Fprint(w, strconv.Quote(i.String()))
+}
+
+// UnmarshalGQL implements the graphql.Unmarshaler interface for Prime
+func (i *Prime) UnmarshalGQL(value interface{}) error {
+	str, ok := value.(string)
+	if !ok {
+		return fmt.Errorf("Prime should be a string, got %T", value)
+	}
+
+	var err error
+	*i, err = PrimeString(str)
+	return err
+}

testdata/primeJson.golden

@@ -0,0 +1,140 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalJSON implements the json.Marshaler interface for Prime
+func (i Prime) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.String())
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface for Prime
+func (i *Prime) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return fmt.Errorf("Prime should be a string, got %s", data)
+	}
+
+	var err error
+	*i, err = PrimeString(s)
+	return err
+}

testdata/primeJsonAndSql.golden

@@ -0,0 +1,170 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalJSON implements the json.Marshaler interface for Prime
+func (i Prime) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.String())
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface for Prime
+func (i *Prime) UnmarshalJSON(data []byte) error {
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return fmt.Errorf("Prime should be a string, got %s", data)
+	}
+
+	var err error
+	*i, err = PrimeString(s)
+	return err
+}
+
+func (i Prime) Value() (driver.Value, error) {
+	return i.String(), nil
+}
+
+func (i *Prime) Scan(value interface{}) error {
+	if value == nil {
+		return nil
+	}
+
+	var str string
+	switch v := value.(type) {
+	case []byte:
+		str = string(v)
+	case string:
+		str = v
+	case fmt.Stringer:
+		str = v.String()
+	default:
+		return fmt.Errorf("invalid value of Prime: %[1]T(%[1]v)", value)
+	}
+
+	val, err := PrimeString(str)
+	if err != nil {
+		return err
+	}
+
+	*i = val
+	return nil
+}

testdata/primeSql.golden

@@ -0,0 +1,153 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+func (i Prime) Value() (driver.Value, error) {
+	return i.String(), nil
+}
+
+func (i *Prime) Scan(value interface{}) error {
+	if value == nil {
+		return nil
+	}
+
+	var str string
+	switch v := value.(type) {
+	case []byte:
+		str = string(v)
+	case string:
+		str = v
+	case fmt.Stringer:
+		str = v.String()
+	default:
+		return fmt.Errorf("invalid value of Prime: %[1]T(%[1]v)", value)
+	}
+
+	val, err := PrimeString(str)
+	if err != nil {
+		return err
+	}
+
+	*i = val
+	return nil
+}

testdata/primeText.golden

@@ -0,0 +1,135 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalText implements the encoding.TextMarshaler interface for Prime
+func (i Prime) MarshalText() ([]byte, error) {
+	return []byte(i.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface for Prime
+func (i *Prime) UnmarshalText(text []byte) error {
+	var err error
+	*i, err = PrimeString(string(text))
+	return err
+}

testdata/primeYaml.golden

@@ -0,0 +1,140 @@
+
+const _PrimeName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+const _PrimeLowerName = "p2p3p5p7p11p13p17p19p23p29p37p41p43"
+
+var _PrimeMap = map[Prime]string{
+	2:  _PrimeName[0:2],
+	3:  _PrimeName[2:4],
+	5:  _PrimeName[4:6],
+	7:  _PrimeName[6:8],
+	11: _PrimeName[8:11],
+	13: _PrimeName[11:14],
+	17: _PrimeName[14:17],
+	19: _PrimeName[17:20],
+	23: _PrimeName[20:23],
+	29: _PrimeName[23:26],
+	31: _PrimeName[26:29],
+	41: _PrimeName[29:32],
+	43: _PrimeName[32:35],
+}
+
+func (i Prime) String() string {
+	if str, ok := _PrimeMap[i]; ok {
+		return str
+	}
+	return fmt.Sprintf("Prime(%d)", i)
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _PrimeNoOp() {
+	var x [1]struct{}
+	_ = x[p2-(2)]
+	_ = x[p3-(3)]
+	_ = x[p5-(5)]
+	_ = x[p7-(7)]
+	_ = x[p11-(11)]
+	_ = x[p13-(13)]
+	_ = x[p17-(17)]
+	_ = x[p19-(19)]
+	_ = x[p23-(23)]
+	_ = x[p29-(29)]
+	_ = x[p37-(31)]
+	_ = x[p41-(41)]
+	_ = x[p43-(43)]
+}
+
+var _PrimeValues = []Prime{p2, p3, p5, p7, p11, p13, p17, p19, p23, p29, p37, p41, p43}
+
+var _PrimeNameToValueMap = map[string]Prime{
+	_PrimeName[0:2]:        p2,
+	_PrimeLowerName[0:2]:   p2,
+	_PrimeName[2:4]:        p3,
+	_PrimeLowerName[2:4]:   p3,
+	_PrimeName[4:6]:        p5,
+	_PrimeLowerName[4:6]:   p5,
+	_PrimeName[6:8]:        p7,
+	_PrimeLowerName[6:8]:   p7,
+	_PrimeName[8:11]:       p11,
+	_PrimeLowerName[8:11]:  p11,
+	_PrimeName[11:14]:      p13,
+	_PrimeLowerName[11:14]: p13,
+	_PrimeName[14:17]:      p17,
+	_PrimeLowerName[14:17]: p17,
+	_PrimeName[17:20]:      p19,
+	_PrimeLowerName[17:20]: p19,
+	_PrimeName[20:23]:      p23,
+	_PrimeLowerName[20:23]: p23,
+	_PrimeName[23:26]:      p29,
+	_PrimeLowerName[23:26]: p29,
+	_PrimeName[26:29]:      p37,
+	_PrimeLowerName[26:29]: p37,
+	_PrimeName[29:32]:      p41,
+	_PrimeLowerName[29:32]: p41,
+	_PrimeName[32:35]:      p43,
+	_PrimeLowerName[32:35]: p43,
+}
+
+var _PrimeNames = []string{
+	_PrimeName[0:2],
+	_PrimeName[2:4],
+	_PrimeName[4:6],
+	_PrimeName[6:8],
+	_PrimeName[8:11],
+	_PrimeName[11:14],
+	_PrimeName[14:17],
+	_PrimeName[17:20],
+	_PrimeName[20:23],
+	_PrimeName[23:26],
+	_PrimeName[26:29],
+	_PrimeName[29:32],
+	_PrimeName[32:35],
+}
+
+// PrimeString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func PrimeString(s string) (Prime, error) {
+	if val, ok := _PrimeNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _PrimeNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Prime values", s)
+}
+
+// PrimeValues returns all values of the enum
+func PrimeValues() []Prime {
+	return _PrimeValues
+}
+
+// PrimeStrings returns a slice of all String values of the enum
+func PrimeStrings() []string {
+	strs := make([]string, len(_PrimeNames))
+	copy(strs, _PrimeNames)
+	return strs
+}
+
+// IsAPrime returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Prime) IsAPrime() bool {
+	_, ok := _PrimeMap[i]
+	return ok
+}
+
+// MarshalYAML implements a YAML Marshaler for Prime
+func (i Prime) MarshalYAML() (interface{}, error) {
+	return i.String(), nil
+}
+
+// UnmarshalYAML implements a YAML Unmarshaler for Prime
+func (i *Prime) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var s string
+	if err := unmarshal(&s); err != nil {
+		return err
+	}
+
+	var err error
+	*i, err = PrimeString(s)
+	return err
+}

testdata/transform.go

@@ -1,25 +0,0 @@
-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("transform.go: " + str)
-	}
-}

testdata/transform_first.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type FirstCaseValue int
+
+const (
+	Male FirstCaseValue = iota
+	Female
+	unknown
+)
+
+func main() {
+	ck(Male, "M")
+	ck(Female, "F")
+	ck(unknown, "u")
+	ck(-127, "FirstCaseValue(-127)")
+	ck(127, "FirstCaseValue(127)")
+}
+
+func ck(value FirstCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_first.go: " + str)
+	}
+}

testdata/transform_first_lower.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type FirstLowerCaseValue int
+
+const (
+	Male FirstLowerCaseValue = iota
+	Female
+	Unknown
+)
+
+func main() {
+	ck(Male, "m")
+	ck(Female, "f")
+	ck(Unknown, "u")
+	ck(-127, "FirstLowerCaseValue(-127)")
+	ck(127, "FirstLowerCaseValue(127)")
+}
+
+func ck(value FirstLowerCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_first_lower.go: " + str)
+	}
+}

testdata/transform_first_upper.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type FirstUpperCaseValue int
+
+const (
+	male FirstUpperCaseValue = iota
+	female
+	unknown
+)
+
+func main() {
+	ck(male, "M")
+	ck(female, "F")
+	ck(unknown, "U")
+	ck(-127, "FirstUpperCaseValue(-127)")
+	ck(127, "FirstUpperCaseValue(127)")
+}
+
+func ck(value FirstUpperCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_first_upper.go: " + str)
+	}
+}

testdata/transform_kebab.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type KebabCaseValue int
+
+const (
+	KebabCaseValueOne KebabCaseValue = iota
+	KebabCaseValueTwo
+	KebabCaseValueThree
+)
+
+func main() {
+	ck(KebabCaseValueOne, "kebab-case-value-one")
+	ck(KebabCaseValueTwo, "kebab-case-value-two")
+	ck(KebabCaseValueThree, "kebab-case-value-three")
+	ck(-127, "KebabCaseValue(-127)")
+	ck(127, "KebabCaseValue(127)")
+}
+
+func ck(value KebabCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_kebab.go: " + str)
+	}
+}

testdata/transform_kebab_upper.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type KebabUpperCaseValue int
+
+const (
+	KebabUpperCaseValueOne KebabUpperCaseValue = iota
+	KebabUpperCaseValueTwo
+	KebabUpperCaseValueThree
+)
+
+func main() {
+	ck(KebabUpperCaseValueOne, "KEBAB-UPPER-CASE-VALUE-ONE")
+	ck(KebabUpperCaseValueTwo, "KEBAB-UPPER-CASE-VALUE-TWO")
+	ck(KebabUpperCaseValueThree, "KEBAB-UPPER-CASE-VALUE-THREE")
+	ck(-127, "KebabUpperCaseValue(-127)")
+	ck(127, "KebabUpperCaseValue(127)")
+}
+
+func ck(value KebabUpperCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_kebab_upper.go: " + str)
+	}
+}

testdata/transform_lower.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type LowerCaseValue int
+
+const (
+	LowerCaseValueOne LowerCaseValue = iota
+	LowerCaseValueTwo
+	LowerCaseValueThree
+)
+
+func main() {
+	ck(LowerCaseValueOne, "lowercasevalueone")
+	ck(LowerCaseValueTwo, "lowercasevaluetwo")
+	ck(LowerCaseValueThree, "lowercasevaluethree")
+	ck(-127, "LowerCaseValue(-127)")
+	ck(127, "LowerCaseValue(127)")
+}
+
+func ck(value LowerCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_lower.go: " + str)
+	}
+}

testdata/transform_snake.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type SnakeCaseValue int
+
+const (
+	SnakeCaseValueOne SnakeCaseValue = iota
+	SnakeCaseValueTwo
+	SnakeCaseValueThree
+)
+
+func main() {
+	ck(SnakeCaseValueOne, "snake_case_value_one")
+	ck(SnakeCaseValueTwo, "snake_case_value_two")
+	ck(SnakeCaseValueThree, "snake_case_value_three")
+	ck(-127, "SnakeCaseValue(-127)")
+	ck(127, "SnakeCaseValue(127)")
+}
+
+func ck(value SnakeCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_snake.go: " + str)
+	}
+}

testdata/transform_snake_upper.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type SnakeUpperCaseValue int
+
+const (
+	SnakeUpperCaseValueOne SnakeUpperCaseValue = iota
+	SnakeUpperCaseValueTwo
+	SnakeUpperCaseValueThree
+)
+
+func main() {
+	ck(SnakeUpperCaseValueOne, "SNAKE_UPPER_CASE_VALUE_ONE")
+	ck(SnakeUpperCaseValueTwo, "SNAKE_UPPER_CASE_VALUE_TWO")
+	ck(SnakeUpperCaseValueThree, "SNAKE_UPPER_CASE_VALUE_THREE")
+	ck(-127, "SnakeUpperCaseValue(-127)")
+	ck(127, "SnakeUpperCaseValue(127)")
+}
+
+func ck(value SnakeUpperCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_snake_upper.go: " + str)
+	}
+}

testdata/transform_title.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type TitleCaseValue int
+
+const (
+	titlecasevalueone TitleCaseValue = iota
+	titlecasevaluetwo
+	titlecasevaluethree
+)
+
+func main() {
+	ck(titlecasevalueone, "Titlecasevalueone")
+	ck(titlecasevaluetwo, "Titlecasevaluetwo")
+	ck(titlecasevaluethree, "Titlecasevaluethree")
+	ck(-127, "TitleCaseValue(-127)")
+	ck(127, "TitleCaseValue(127)")
+}
+
+func ck(value TitleCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_title.go: " + str)
+	}
+}

testdata/transform_upper.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type UpperCaseValue int
+
+const (
+	UpperCaseValueOne UpperCaseValue = iota
+	UpperCaseValueTwo
+	UpperCaseValueThree
+)
+
+func main() {
+	ck(UpperCaseValueOne, "UPPERCASEVALUEONE")
+	ck(UpperCaseValueTwo, "UPPERCASEVALUETWO")
+	ck(UpperCaseValueThree, "UPPERCASEVALUETHREE")
+	ck(-127, "UpperCaseValue(-127)")
+	ck(127, "UpperCaseValue(127)")
+}
+
+func ck(value UpperCaseValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_upper.go: " + str)
+	}
+}

testdata/transform_whitespace.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type WhitespaceSeparatedValue int
+
+const (
+	WhitespaceSeparatedValueOne WhitespaceSeparatedValue = iota
+	WhitespaceSeparatedValueTwo
+	WhitespaceSeparatedValueThree
+)
+
+func main() {
+	ck(WhitespaceSeparatedValueOne, "whitespace separated value one")
+	ck(WhitespaceSeparatedValueTwo, "whitespace separated value two")
+	ck(WhitespaceSeparatedValueThree, "whitespace separated value three")
+	ck(-127, "WhitespaceSeparatedValue(-127)")
+	ck(127, "WhitespaceSeparatedValue(127)")
+}
+
+func ck(value WhitespaceSeparatedValue, str string) {
+	if fmt.Sprint(value) != str {
+		panic("transform_whitespace.go: " + str)
+	}
+}

testdata/trimPrefix.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "MondayTuesdayWednesdayThursdayFridaySaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 6, 13, 22, 30, 36, 44, 50}
+
+const _DayLowerName = "mondaytuesdaywednesdaythursdayfridaysaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[DayMonday-(0)]
+	_ = x[DayTuesday-(1)]
+	_ = x[DayWednesday-(2)]
+	_ = x[DayThursday-(3)]
+	_ = x[DayFriday-(4)]
+	_ = x[DaySaturday-(5)]
+	_ = x[DaySunday-(6)]
+}
+
+var _DayValues = []Day{DayMonday, DayTuesday, DayWednesday, DayThursday, DayFriday, DaySaturday, DaySunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:6]:        DayMonday,
+	_DayLowerName[0:6]:   DayMonday,
+	_DayName[6:13]:       DayTuesday,
+	_DayLowerName[6:13]:  DayTuesday,
+	_DayName[13:22]:      DayWednesday,
+	_DayLowerName[13:22]: DayWednesday,
+	_DayName[22:30]:      DayThursday,
+	_DayLowerName[22:30]: DayThursday,
+	_DayName[30:36]:      DayFriday,
+	_DayLowerName[30:36]: DayFriday,
+	_DayName[36:44]:      DaySaturday,
+	_DayLowerName[36:44]: DaySaturday,
+	_DayName[44:50]:      DaySunday,
+	_DayLowerName[44:50]: DaySunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:6],
+	_DayName[6:13],
+	_DayName[13:22],
+	_DayName[22:30],
+	_DayName[30:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/trimPrefixMultiple.golden

@@ -0,0 +1,90 @@
+
+const _DayName = "MondayTuesdayWednesdayThursdayFridaySaturdaySunday"
+
+var _DayIndex = [...]uint8{0, 6, 13, 22, 30, 36, 44, 50}
+
+const _DayLowerName = "mondaytuesdaywednesdaythursdayfridaysaturdaysunday"
+
+func (i Day) String() string {
+	if i < 0 || i >= Day(len(_DayIndex)-1) {
+		return fmt.Sprintf("Day(%d)", i)
+	}
+	return _DayName[_DayIndex[i]:_DayIndex[i+1]]
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _DayNoOp() {
+	var x [1]struct{}
+	_ = x[DayMonday-(0)]
+	_ = x[NightTuesday-(1)]
+	_ = x[DayWednesday-(2)]
+	_ = x[NightThursday-(3)]
+	_ = x[DayFriday-(4)]
+	_ = x[NightSaturday-(5)]
+	_ = x[DaySunday-(6)]
+}
+
+var _DayValues = []Day{DayMonday, NightTuesday, DayWednesday, NightThursday, DayFriday, NightSaturday, DaySunday}
+
+var _DayNameToValueMap = map[string]Day{
+	_DayName[0:6]:        DayMonday,
+	_DayLowerName[0:6]:   DayMonday,
+	_DayName[6:13]:       NightTuesday,
+	_DayLowerName[6:13]:  NightTuesday,
+	_DayName[13:22]:      DayWednesday,
+	_DayLowerName[13:22]: DayWednesday,
+	_DayName[22:30]:      NightThursday,
+	_DayLowerName[22:30]: NightThursday,
+	_DayName[30:36]:      DayFriday,
+	_DayLowerName[30:36]: DayFriday,
+	_DayName[36:44]:      NightSaturday,
+	_DayLowerName[36:44]: NightSaturday,
+	_DayName[44:50]:      DaySunday,
+	_DayLowerName[44:50]: DaySunday,
+}
+
+var _DayNames = []string{
+	_DayName[0:6],
+	_DayName[6:13],
+	_DayName[13:22],
+	_DayName[22:30],
+	_DayName[30:36],
+	_DayName[36:44],
+	_DayName[44:50],
+}
+
+// DayString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func DayString(s string) (Day, error) {
+	if val, ok := _DayNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _DayNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Day values", s)
+}
+
+// DayValues returns all values of the enum
+func DayValues() []Day {
+	return _DayValues
+}
+
+// DayStrings returns a slice of all String values of the enum
+func DayStrings() []string {
+	strs := make([]string, len(_DayNames))
+	copy(strs, _DayNames)
+	return strs
+}
+
+// IsADay returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Day) IsADay() bool {
+	for _, v := range _DayValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

testdata/unum.golden

@@ -0,0 +1,97 @@
+
+const (
+	_UnumName_0      = "m0m1m2"
+	_UnumLowerName_0 = "m0m1m2"
+	_UnumName_1      = "m_2m_1"
+	_UnumLowerName_1 = "m_2m_1"
+)
+
+var (
+	_UnumIndex_0 = [...]uint8{0, 2, 4, 6}
+	_UnumIndex_1 = [...]uint8{0, 3, 6}
+)
+
+func (i Unum) String() string {
+	switch {
+	case 0 <= i && i <= 2:
+		return _UnumName_0[_UnumIndex_0[i]:_UnumIndex_0[i+1]]
+	case 253 <= i && i <= 254:
+		i -= 253
+		return _UnumName_1[_UnumIndex_1[i]:_UnumIndex_1[i+1]]
+	default:
+		return fmt.Sprintf("Unum(%d)", i)
+	}
+}
+
+func (Unum) Values() []string {
+	return UnumStrings()
+}
+
+// An "invalid array index" compiler error signifies that the constant values have changed.
+// Re-run the stringer command to generate them again.
+func _UnumNoOp() {
+	var x [1]struct{}
+	_ = x[m0-(0)]
+	_ = x[m1-(1)]
+	_ = x[m2-(2)]
+	_ = x[m_2-(253)]
+	_ = x[m_1-(254)]
+}
+
+var _UnumValues = []Unum{m0, m1, m2, m_2, m_1}
+
+var _UnumNameToValueMap = map[string]Unum{
+	_UnumName_0[0:2]:      m0,
+	_UnumLowerName_0[0:2]: m0,
+	_UnumName_0[2:4]:      m1,
+	_UnumLowerName_0[2:4]: m1,
+	_UnumName_0[4:6]:      m2,
+	_UnumLowerName_0[4:6]: m2,
+	_UnumName_1[0:3]:      m_2,
+	_UnumLowerName_1[0:3]: m_2,
+	_UnumName_1[3:6]:      m_1,
+	_UnumLowerName_1[3:6]: m_1,
+}
+
+var _UnumNames = []string{
+	_UnumName_0[0:2],
+	_UnumName_0[2:4],
+	_UnumName_0[4:6],
+	_UnumName_1[0:3],
+	_UnumName_1[3:6],
+}
+
+// UnumString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func UnumString(s string) (Unum, error) {
+	if val, ok := _UnumNameToValueMap[s]; ok {
+		return val, nil
+	}
+
+	if val, ok := _UnumNameToValueMap[strings.ToLower(s)]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Unum values", s)
+}
+
+// UnumValues returns all values of the enum
+func UnumValues() []Unum {
+	return _UnumValues
+}
+
+// UnumStrings returns a slice of all String values of the enum
+func UnumStrings() []string {
+	strs := make([]string, len(_UnumNames))
+	copy(strs, _UnumNames)
+	return strs
+}
+
+// IsAUnum returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Unum) IsAUnum() bool {
+	for _, v := range _UnumValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}

util_test.go

@@ -54,7 +54,7 @@ Outer:
 	for n, test := range splitTests {
 		values := make([]Value, len(test.input))
 		for i, v := range test.input {
-			values[i] = Value{"", v, test.signed, fmt.Sprint(v), ""}
+			values[i] = Value{"", "", v, test.signed, fmt.Sprint(v)}
 		}
 		runs := splitIntoRuns(values)
 		if len(runs) != len(test.output) {