Porting #1451 to v3

.github/workflows/cli.yml

@@ -46,6 +46,9 @@ jobs:
       - name: test
         run: go run internal/build/build.go test
 
+      - name: test urfave-cli-genflags
+        run: make -C cmd/urfave-cli-genflags
+
       - name: check-binary-size
         run: go run internal/build/build.go check-binary-size
 

.gitignore

@@ -6,5 +6,6 @@ internal/*/built-example
 coverage.txt
 /.local/
 /site/
+/cmd/urfave-cli-genflags/urfave-cli-genflags
 
 *.exe

cli.go

@@ -20,4 +20,4 @@
 //   }
 package cli
 
-//go:generate go run internal/genflags/cmd/genflags/main.go
+//go:generate go run cmd/urfave-cli-genflags/main.go

cmd/urfave-cli-genflags/Makefile

@@ -0,0 +1,21 @@
+GOTEST_FLAGS ?= -v --coverprofile main.coverprofile --covermode count --cover github.com/urfave/cli/v2/cmd/urfave-cli-genflags
+GOBUILD_FLAGS ?= -x
+
+.PHONY: all
+all: test build smoke-test
+
+.PHONY: test
+test:
+	go test $(GOTEST_FLAGS) ./...
+
+.PHONY: build
+build:
+	go build $(GOBUILD_FLAGS) ./...
+
+.PHONY: smoke-test
+smoke-test: build
+	./urfave-cli-genflags --help
+
+.PHONY: show-cover
+show-cover:
+	go tool cover -func main.coverprofile

cmd/urfave-cli-genflags/README.md

@@ -0,0 +1,15 @@
+# urfave-cli-genflags
+
+This is a tool that is used internally by [urfave/cli] to generate
+flag types and methods from a YAML input. It intentionally pins
+usage of `github.com/urfave/cli/v2` to a *release* rather than
+using the adjacent code so that changes don't result in *this* tool
+refusing to compile. It's almost like dogfooding?
+
+## support warning
+
+This tool is maintained as a sub-project and is not covered by the
+API and backward compatibility guaranteed by releases of
+[urfave/cli].
+
+[urfave/cli]: https://github.com/urfave/cli

cmd/urfave-cli-genflags/go.mod

@@ -0,0 +1,15 @@
+module github.com/urfave/cli/v2/cmd/urfave-cli-genflags
+
+go 1.18
+
+require (
+	github.com/urfave/cli/v2 v2.11.2
+	golang.org/x/text v0.3.7
+	gopkg.in/yaml.v3 v3.0.1
+)
+
+require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+)

cmd/urfave-cli-genflags/go.sum

@@ -0,0 +1,17 @@
+github.com/BurntSushi/toml v1.1.0 h1:ksErzDEI1khOiGPgpwuI7x2ebx/uXQNw7xJpn9Eq1+I=
+github.com/BurntSushi/toml v1.1.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/urfave/cli/v2 v2.11.2 h1:FVfNg4m3vbjbBpLYxW//WjxUoHvJ9TlppXcqY9Q9ZfA=
+github.com/urfave/cli/v2 v2.11.2/go.mod h1:f8iq5LtQ/bLxafbdBSLPPNsgaW0l/2fYYEHhAyPlwvo=
+github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
+github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsrSj3ccvlPHLoLsHnpR27oXr4ZE984MbSER8=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+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=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/genflags/cmd/genflags/main.go → cmd/urfave-cli-genflags/main.go

@@ -9,19 +9,31 @@ import (
 	"os/exec"
 	"os/signal"
 	"path/filepath"
+	"sort"
 	"strings"
 	"syscall"
 	"text/template"
 
 	"github.com/urfave/cli/v2"
-	"github.com/urfave/cli/v2/internal/genflags"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
 	"gopkg.in/yaml.v3"
 )
 
 const (
 	defaultPackageName = "cli"
 )
 
+var (
+	//go:embed generated.gotmpl
+	TemplateString string
+
+	//go:embed generated_test.gotmpl
+	TestTemplateString string
+
+	titler = cases.Title(language.Und, cases.NoLower)
+)
+
 func sh(ctx context.Context, exe string, args ...string) (string, error) {
 	cmd := exec.CommandContext(ctx, exe, args...)
 	cmd.Stderr = os.Stderr
@@ -92,7 +104,7 @@ func runGenFlags(cCtx *cli.Context) error {
 		return err
 	}
 
-	spec := &genflags.Spec{}
+	spec := &Spec{}
 	if err := yaml.Unmarshal(specBytes, spec); err != nil {
 		return err
 	}
@@ -123,12 +135,12 @@ func runGenFlags(cCtx *cli.Context) error {
 		spec.UrfaveCLITestNamespace = "cli."
 	}
 
-	genTmpl, err := template.New("gen").Parse(genflags.TemplateString)
+	genTmpl, err := template.New("gen").Parse(TemplateString)
 	if err != nil {
 		return err
 	}
 
-	genTestTmpl, err := template.New("gen_test").Parse(genflags.TestTemplateString)
+	genTestTmpl, err := template.New("gen_test").Parse(TestTemplateString)
 	if err != nil {
 		return err
 	}
@@ -161,3 +173,120 @@ func runGenFlags(cCtx *cli.Context) error {
 
 	return nil
 }
+
+func TypeName(goType string, fc *FlagTypeConfig) string {
+	if fc != nil && strings.TrimSpace(fc.TypeName) != "" {
+		return strings.TrimSpace(fc.TypeName)
+	}
+
+	dotSplit := strings.Split(goType, ".")
+	goType = dotSplit[len(dotSplit)-1]
+
+	if strings.HasPrefix(goType, "[]") {
+		return titler.String(strings.TrimPrefix(goType, "[]")) + "SliceFlag"
+	}
+
+	return titler.String(goType) + "Flag"
+}
+
+type Spec struct {
+	FlagTypes              map[string]*FlagTypeConfig `yaml:"flag_types"`
+	PackageName            string                     `yaml:"package_name"`
+	TestPackageName        string                     `yaml:"test_package_name"`
+	UrfaveCLINamespace     string                     `yaml:"urfave_cli_namespace"`
+	UrfaveCLITestNamespace string                     `yaml:"urfave_cli_test_namespace"`
+}
+
+func (gfs *Spec) SortedFlagTypes() []*FlagType {
+	typeNames := []string{}
+
+	for name := range gfs.FlagTypes {
+		if strings.HasPrefix(name, "[]") {
+			name = strings.TrimPrefix(name, "[]") + "Slice"
+		}
+
+		typeNames = append(typeNames, name)
+	}
+
+	sort.Strings(typeNames)
+
+	ret := make([]*FlagType, len(typeNames))
+
+	for i, typeName := range typeNames {
+		ret[i] = &FlagType{
+			GoType: typeName,
+			Config: gfs.FlagTypes[typeName],
+		}
+	}
+
+	return ret
+}
+
+type FlagTypeConfig struct {
+	SkipInterfaces []string           `yaml:"skip_interfaces"`
+	StructFields   []*FlagStructField `yaml:"struct_fields"`
+	TypeName       string             `yaml:"type_name"`
+	ValuePointer   bool               `yaml:"value_pointer"`
+}
+
+type FlagStructField struct {
+	Name string
+	Type string
+}
+
+type FlagType struct {
+	GoType string
+	Config *FlagTypeConfig
+}
+
+func (ft *FlagType) StructFields() []*FlagStructField {
+	if ft.Config == nil || ft.Config.StructFields == nil {
+		return []*FlagStructField{}
+	}
+
+	return ft.Config.StructFields
+}
+
+func (ft *FlagType) ValuePointer() bool {
+	if ft.Config == nil {
+		return false
+	}
+
+	return ft.Config.ValuePointer
+}
+
+func (ft *FlagType) TypeName() string {
+	return TypeName(ft.GoType, ft.Config)
+}
+
+func (ft *FlagType) GenerateFmtStringerInterface() bool {
+	return ft.skipInterfaceNamed("fmt.Stringer")
+}
+
+func (ft *FlagType) GenerateFlagInterface() bool {
+	return ft.skipInterfaceNamed("Flag")
+}
+
+func (ft *FlagType) GenerateRequiredFlagInterface() bool {
+	return ft.skipInterfaceNamed("RequiredFlag")
+}
+
+func (ft *FlagType) GenerateVisibleFlagInterface() bool {
+	return ft.skipInterfaceNamed("VisibleFlag")
+}
+
+func (ft *FlagType) skipInterfaceNamed(name string) bool {
+	if ft.Config == nil {
+		return true
+	}
+
+	lowName := strings.ToLower(name)
+
+	for _, interfaceName := range ft.Config.SkipInterfaces {
+		if strings.ToLower(interfaceName) == lowName {
+			return false
+		}
+	}
+
+	return true
+}

internal/genflags/spec_test.go → cmd/urfave-cli-genflags/main_test.go

@@ -1,42 +1,76 @@
-package genflags_test
+package main_test
 
 import (
+	"fmt"
 	"reflect"
 	"testing"
 
-	"github.com/urfave/cli/v2/internal/genflags"
+	main "github.com/urfave/cli/v2/cmd/urfave-cli-genflags"
 )
 
+func TestTypeName(t *testing.T) {
+	for _, tc := range []struct {
+		gt       string
+		fc       *main.FlagTypeConfig
+		expected string
+	}{
+		{gt: "int", fc: nil, expected: "IntFlag"},
+		{gt: "int", fc: &main.FlagTypeConfig{}, expected: "IntFlag"},
+		{gt: "int", fc: &main.FlagTypeConfig{TypeName: "VeryIntyFlag"}, expected: "VeryIntyFlag"},
+		{gt: "[]bool", fc: nil, expected: "BoolSliceFlag"},
+		{gt: "[]bool", fc: &main.FlagTypeConfig{}, expected: "BoolSliceFlag"},
+		{gt: "[]bool", fc: &main.FlagTypeConfig{TypeName: "ManyTruthsFlag"}, expected: "ManyTruthsFlag"},
+		{gt: "time.Rumination", fc: nil, expected: "RuminationFlag"},
+		{gt: "time.Rumination", fc: &main.FlagTypeConfig{}, expected: "RuminationFlag"},
+		{gt: "time.Rumination", fc: &main.FlagTypeConfig{TypeName: "PonderFlag"}, expected: "PonderFlag"},
+	} {
+		t.Run(
+			fmt.Sprintf("type=%s,cfg=%v", tc.gt, func() string {
+				if tc.fc != nil {
+					return tc.fc.TypeName
+				}
+				return "nil"
+			}()),
+			func(ct *testing.T) {
+				actual := main.TypeName(tc.gt, tc.fc)
+				if tc.expected != actual {
+					ct.Errorf("expected %q, got %q", tc.expected, actual)
+				}
+			},
+		)
+	}
+}
+
 func TestSpec_SortedFlagTypes(t *testing.T) {
-	spec := &genflags.Spec{
-		FlagTypes: map[string]*genflags.FlagTypeConfig{
-			"nerf": &genflags.FlagTypeConfig{},
+	spec := &main.Spec{
+		FlagTypes: map[string]*main.FlagTypeConfig{
+			"nerf": &main.FlagTypeConfig{},
 			"gerf": nil,
 		},
 	}
 
 	actual := spec.SortedFlagTypes()
-	expected := []*genflags.FlagType{
+	expected := []*main.FlagType{
 		{
 			GoType: "gerf",
 			Config: nil,
 		},
 		{
 			GoType: "nerf",
-			Config: &genflags.FlagTypeConfig{},
+			Config: &main.FlagTypeConfig{},
 		},
 	}
 	if !reflect.DeepEqual(expected, actual) {
 		t.Errorf("expected %#v, got %#v", expected, actual)
 	}
 }
 
-func genFlagType() *genflags.FlagType {
-	return &genflags.FlagType{
+func genFlagType() *main.FlagType {
+	return &main.FlagType{
 		GoType: "blerf",
-		Config: &genflags.FlagTypeConfig{
+		Config: &main.FlagTypeConfig{
 			SkipInterfaces: []string{"fmt.Stringer"},
-			StructFields: []*genflags.FlagStructField{
+			StructFields: []*main.FlagStructField{
 				{
 					Name: "Foibles",
 					Type: "int",

docs/CONTRIBUTING.md

@@ -95,7 +95,7 @@ The built-in `go generate` command is used to run the commands specified in
 line help system which may be consulted for further information, e.g.:
 
 ```sh
-go run internal/genflags/cmd/genflags/main.go --help
+go run cmd/urfave-cli-genflags/main.go --help
 ```
 
 #### docs output

flag-spec.yaml

@@ -1,6 +1,6 @@
 # NOTE: this file is used by the tool defined in
-# ./internal/genflags/cmd/genflags/main.go which uses the
-# `genflags.Spec` type that maps to this file structure.
+# ./cmd/urfave-cli-genflags/main.go which uses the
+# `Spec` type that maps to this file structure.
 
 flag_types:
   bool: 

go.mod

@@ -6,7 +6,6 @@ require (
 	github.com/BurntSushi/toml v1.1.0
 	github.com/cpuguy83/go-md2man/v2 v2.0.2
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673
-	golang.org/x/text v0.3.7
 	gopkg.in/yaml.v3 v3.0.1
 )