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kong_test.go
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package kong_test
import (
"bytes"
"errors"
"fmt"
"sort"
"strings"
"testing"
"github.com/alecthomas/assert/v2"
"github.com/alecthomas/repr"
"github.com/alecthomas/kong"
)
func mustNew(t *testing.T, cli any, options ...kong.Option) *kong.Kong {
t.Helper()
options = append([]kong.Option{
kong.Name("test"),
kong.Exit(func(int) {
t.Helper()
t.Fatalf("unexpected exit()")
}),
}, options...)
parser, err := kong.New(cli, options...)
assert.NoError(t, err)
return parser
}
func TestPositionalArguments(t *testing.T) {
var cli struct {
User struct {
Create struct {
ID int `kong:"arg"`
First string `kong:"arg"`
Last string `kong:"arg"`
} `kong:"cmd"`
} `kong:"cmd"`
}
p := mustNew(t, &cli)
ctx, err := p.Parse([]string{"user", "create", "10", "Alec", "Thomas"})
assert.NoError(t, err)
assert.Equal(t, "user create <id> <first> <last>", ctx.Command())
t.Run("Missing", func(t *testing.T) {
_, err := p.Parse([]string{"user", "create", "10"})
assert.Error(t, err)
})
}
func TestBranchingArgument(t *testing.T) {
/*
app user create <id> <first> <last>
app user <id> delete
app user <id> rename <to>
*/
var cli struct {
User struct {
Create struct {
ID string `kong:"arg"`
First string `kong:"arg"`
Last string `kong:"arg"`
} `kong:"cmd"`
// Branching argument.
ID struct {
ID int `kong:"arg"`
Flag int
Delete struct{} `kong:"cmd"`
Rename struct {
To string
} `kong:"cmd"`
} `kong:"arg"`
} `kong:"cmd,help='User management.'"`
}
p := mustNew(t, &cli)
ctx, err := p.Parse([]string{"user", "10", "delete"})
assert.NoError(t, err)
assert.Equal(t, 10, cli.User.ID.ID)
assert.Equal(t, "user <id> delete", ctx.Command())
t.Run("Missing", func(t *testing.T) {
_, err = p.Parse([]string{"user"})
assert.Error(t, err)
})
}
func TestResetWithDefaults(t *testing.T) {
var cli struct {
Flag string
FlagWithDefault string `kong:"default='default'"`
}
cli.Flag = "BLAH"
cli.FlagWithDefault = "BLAH"
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{})
assert.NoError(t, err)
assert.Equal(t, "", cli.Flag)
assert.Equal(t, "default", cli.FlagWithDefault)
}
func TestFlagSlice(t *testing.T) {
var cli struct {
Slice []int
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{"--slice=1,2,3"})
assert.NoError(t, err)
assert.Equal(t, []int{1, 2, 3}, cli.Slice)
}
func TestFlagSliceWithSeparator(t *testing.T) {
var cli struct {
Slice []string
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{`--slice=a\,b,c`})
assert.NoError(t, err)
assert.Equal(t, []string{"a,b", "c"}, cli.Slice)
}
func TestArgSlice(t *testing.T) {
var cli struct {
Slice []int `arg`
Flag bool
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{"1", "2", "3", "--flag"})
assert.NoError(t, err)
assert.Equal(t, []int{1, 2, 3}, cli.Slice)
assert.Equal(t, true, cli.Flag)
}
func TestArgSliceWithSeparator(t *testing.T) {
var cli struct {
Slice []string `arg`
Flag bool
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{"a,b", "c", "--flag"})
assert.NoError(t, err)
assert.Equal(t, []string{"a,b", "c"}, cli.Slice)
assert.Equal(t, true, cli.Flag)
}
func TestUnsupportedFieldErrors(t *testing.T) {
var cli struct {
Keys struct{}
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
func TestMatchingArgField(t *testing.T) {
var cli struct {
ID struct {
NotID int `kong:"arg"`
} `kong:"arg"`
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
func TestCantMixPositionalAndBranches(t *testing.T) {
var cli struct {
Arg string `kong:"arg"`
Command struct {
} `kong:"cmd"`
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
func TestPropagatedFlags(t *testing.T) {
var cli struct {
Flag1 string
Command1 struct {
Flag2 bool
Command2 struct{} `kong:"cmd"`
} `kong:"cmd"`
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{"command-1", "command-2", "--flag-2", "--flag-1=moo"})
assert.NoError(t, err)
assert.Equal(t, "moo", cli.Flag1)
assert.Equal(t, true, cli.Command1.Flag2)
}
func TestRequiredFlag(t *testing.T) {
var cli struct {
Flag string `kong:"required"`
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{})
assert.Error(t, err)
}
func TestOptionalArg(t *testing.T) {
var cli struct {
Arg string `kong:"arg,optional"`
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{})
assert.NoError(t, err)
}
func TestOptionalArgWithDefault(t *testing.T) {
var cli struct {
Arg string `kong:"arg,optional,default='moo'"`
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{})
assert.NoError(t, err)
assert.Equal(t, "moo", cli.Arg)
}
func TestArgWithDefaultIsOptional(t *testing.T) {
var cli struct {
Arg string `kong:"arg,default='moo'"`
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{})
assert.NoError(t, err)
assert.Equal(t, "moo", cli.Arg)
}
func TestRequiredArg(t *testing.T) {
var cli struct {
Arg string `kong:"arg"`
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{})
assert.Error(t, err)
}
func TestInvalidRequiredAfterOptional(t *testing.T) {
var cli struct {
ID int `kong:"arg,optional"`
Name string `kong:"arg"`
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
func TestOptionalStructArg(t *testing.T) {
var cli struct {
Name struct {
Name string `kong:"arg,optional"`
Enabled bool
} `kong:"arg,optional"`
}
parser := mustNew(t, &cli)
t.Run("WithFlag", func(t *testing.T) {
_, err := parser.Parse([]string{"gak", "--enabled"})
assert.NoError(t, err)
assert.Equal(t, "gak", cli.Name.Name)
assert.Equal(t, true, cli.Name.Enabled)
})
t.Run("WithoutFlag", func(t *testing.T) {
_, err := parser.Parse([]string{"gak"})
assert.NoError(t, err)
assert.Equal(t, "gak", cli.Name.Name)
})
t.Run("WithNothing", func(t *testing.T) {
_, err := parser.Parse([]string{})
assert.NoError(t, err)
})
}
func TestMixedRequiredArgs(t *testing.T) {
var cli struct {
Name string `kong:"arg"`
ID int `kong:"arg,optional"`
}
parser := mustNew(t, &cli)
t.Run("SingleRequired", func(t *testing.T) {
_, err := parser.Parse([]string{"gak", "5"})
assert.NoError(t, err)
assert.Equal(t, "gak", cli.Name)
assert.Equal(t, 5, cli.ID)
})
t.Run("ExtraOptional", func(t *testing.T) {
_, err := parser.Parse([]string{"gak"})
assert.NoError(t, err)
assert.Equal(t, "gak", cli.Name)
})
}
func TestInvalidDefaultErrors(t *testing.T) {
var cli struct {
Flag int `kong:"default='foo'"`
}
p := mustNew(t, &cli)
_, err := p.Parse(nil)
assert.Error(t, err)
}
func TestCommandMissingTagIsInvalid(t *testing.T) {
var cli struct {
One struct{}
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
func TestDuplicateFlag(t *testing.T) {
var cli struct {
Flag bool
Cmd struct {
Flag bool
} `kong:"cmd"`
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
func TestDuplicateFlagOnPeerCommandIsOkay(t *testing.T) {
var cli struct {
Cmd1 struct {
Flag bool
} `kong:"cmd"`
Cmd2 struct {
Flag bool
} `kong:"cmd"`
}
_, err := kong.New(&cli)
assert.NoError(t, err)
}
func TestTraceErrorPartiallySucceeds(t *testing.T) {
var cli struct {
One struct {
Two struct {
} `kong:"cmd"`
} `kong:"cmd"`
}
p := mustNew(t, &cli)
ctx, err := kong.Trace(p, []string{"one", "bad"})
assert.NoError(t, err)
assert.Error(t, ctx.Error)
assert.Equal(t, "one", ctx.Command())
}
type commandWithNegatableFlag struct {
Flag bool `kong:"default='true',negatable"`
Custom bool `kong:"default='true',negatable='standard'"`
ran bool
}
func (c *commandWithNegatableFlag) Run() error {
c.ran = true
return nil
}
func TestNegatableFlag(t *testing.T) {
tests := []struct {
name string
args []string
expectedFlag bool
expectedCustom bool
}{
{
name: "no flag",
args: []string{"cmd"},
expectedFlag: true,
expectedCustom: true,
},
{
name: "boolean flag",
args: []string{"cmd", "--flag"},
expectedFlag: true,
expectedCustom: true,
},
{
name: "custom boolean flag",
args: []string{"cmd", "--custom"},
expectedFlag: true,
expectedCustom: true,
},
{
name: "inverted boolean flag",
args: []string{"cmd", "--flag=false"},
expectedFlag: false,
expectedCustom: true,
},
{
name: "custom inverted boolean flag",
args: []string{"cmd", "--custom=false"},
expectedFlag: true,
expectedCustom: false,
},
{
name: "negated boolean flag",
args: []string{"cmd", "--no-flag"},
expectedFlag: false,
expectedCustom: true,
},
{
name: "custom negated boolean flag",
args: []string{"cmd", "--standard"},
expectedFlag: true,
expectedCustom: false,
},
{
name: "inverted negated boolean flag",
args: []string{"cmd", "--no-flag=false"},
expectedFlag: true,
expectedCustom: true,
},
{
name: "inverted custom negated boolean flag",
args: []string{"cmd", "--standard=false"},
expectedFlag: true,
expectedCustom: true,
},
}
for _, tt := range tests {
tt := tt
t.Run(tt.name, func(t *testing.T) {
var cli struct {
Cmd commandWithNegatableFlag `kong:"cmd"`
}
p := mustNew(t, &cli)
kctx, err := p.Parse(tt.args)
assert.NoError(t, err)
assert.Equal(t, tt.expectedFlag, cli.Cmd.Flag)
assert.Equal(t, tt.expectedCustom, cli.Cmd.Custom)
err = kctx.Run()
assert.NoError(t, err)
assert.Equal(t, tt.expectedFlag, cli.Cmd.Flag)
assert.Equal(t, tt.expectedCustom, cli.Cmd.Custom)
assert.True(t, cli.Cmd.ran)
})
}
}
func TestDuplicateNegatableLong(t *testing.T) {
cli2 := struct {
NoFlag bool
Flag bool `negatable:""` // negation duplicates NoFlag
}{}
_, err := kong.New(&cli2)
assert.EqualError(t, err, "<anonymous struct>.Flag: duplicate negation flag --no-flag")
cli3 := struct {
One bool
Two bool `negatable:"one"` // negation duplicates Flag2
}{}
_, err = kong.New(&cli3)
assert.EqualError(t, err, "<anonymous struct>.Two: duplicate negation flag --one")
}
func TestDuplicateNegatableFlagsInSubcommands(t *testing.T) {
cli2 := struct {
Sub struct {
Negated bool `negatable:"nope-"`
} `cmd:""`
Sub2 struct {
Negated bool `negatable:"nope-"`
} `cmd:""`
}{}
_, err := kong.New(&cli2)
assert.NoError(t, err)
}
func TestExistingNoFlag(t *testing.T) {
var cli struct {
Cmd struct {
Flag bool `kong:"default='true'"`
NoFlag string
} `kong:"cmd"`
}
p := mustNew(t, &cli)
_, err := p.Parse([]string{"cmd", "--no-flag=none"})
assert.NoError(t, err)
assert.Equal(t, true, cli.Cmd.Flag)
assert.Equal(t, "none", cli.Cmd.NoFlag)
}
func TestInvalidNegatedNonBool(t *testing.T) {
var cli struct {
Cmd struct {
Flag string `kong:"negatable"`
} `kong:"cmd"`
}
_, err := kong.New(&cli)
assert.Error(t, err)
}
type hookContext struct {
cmd bool
values []string
}
type hookValue string
func (h *hookValue) BeforeApply(ctx *hookContext) error {
ctx.values = append(ctx.values, "before:"+string(*h))
return nil
}
func (h *hookValue) AfterApply(ctx *hookContext) error {
ctx.values = append(ctx.values, "after:"+string(*h))
return nil
}
type hookCmd struct {
Two hookValue `kong:"arg,optional"`
Three hookValue
}
func (h *hookCmd) BeforeApply(ctx *hookContext) error {
ctx.cmd = true
return nil
}
func (h *hookCmd) AfterApply(ctx *hookContext) error {
ctx.cmd = true
return nil
}
func TestHooks(t *testing.T) {
var tests = []struct {
name string
input string
values hookContext
}{
{"Command", "one", hookContext{true, nil}},
{"Arg", "one two", hookContext{true, []string{"before:", "after:two"}}},
{"Flag", "one --three=THREE", hookContext{true, []string{"before:", "after:THREE"}}},
{"ArgAndFlag", "one two --three=THREE", hookContext{true, []string{"before:", "before:", "after:two", "after:THREE"}}},
}
var cli struct {
One hookCmd `cmd:""`
}
ctx := &hookContext{}
p := mustNew(t, &cli, kong.Bind(ctx))
for _, test := range tests {
test := test
*ctx = hookContext{}
cli.One = hookCmd{}
t.Run(test.name, func(t *testing.T) {
_, err := p.Parse(strings.Split(test.input, " "))
assert.NoError(t, err)
assert.Equal(t, &test.values, ctx)
})
}
}
func TestShort(t *testing.T) {
var cli struct {
Bool bool `short:"b"`
String string `short:"s"`
}
app := mustNew(t, &cli)
_, err := app.Parse([]string{"-b", "-shello"})
assert.NoError(t, err)
assert.True(t, cli.Bool)
assert.Equal(t, "hello", cli.String)
}
func TestAlias(t *testing.T) {
var cli struct {
String string `aliases:"str"`
}
app := mustNew(t, &cli)
_, err := app.Parse([]string{"--str", "hello"})
assert.NoError(t, err)
assert.Equal(t, "hello", cli.String)
}
func TestDuplicateFlagChoosesLast(t *testing.T) {
var cli struct {
Flag int
}
_, err := mustNew(t, &cli).Parse([]string{"--flag=1", "--flag=2"})
assert.NoError(t, err)
assert.Equal(t, 2, cli.Flag)
}
func TestDuplicateSliceAccumulates(t *testing.T) {
var cli struct {
Flag []int
}
args := []string{"--flag=1,2", "--flag=3,4"}
_, err := mustNew(t, &cli).Parse(args)
assert.NoError(t, err)
assert.Equal(t, []int{1, 2, 3, 4}, cli.Flag)
}
func TestMapFlag(t *testing.T) {
var cli struct {
Set map[string]int
}
_, err := mustNew(t, &cli).Parse([]string{"--set", "a=10", "--set", "b=20"})
assert.NoError(t, err)
assert.Equal(t, map[string]int{"a": 10, "b": 20}, cli.Set)
}
func TestMapFlagWithSliceValue(t *testing.T) {
var cli struct {
Set map[string][]int
}
_, err := mustNew(t, &cli).Parse([]string{"--set", "a=1,2", "--set", "b=3"})
assert.NoError(t, err)
assert.Equal(t, map[string][]int{"a": {1, 2}, "b": {3}}, cli.Set)
}
type embeddedFlags struct {
Embedded string
}
func TestEmbeddedStruct(t *testing.T) {
var cli struct {
embeddedFlags
NotEmbedded string
}
_, err := mustNew(t, &cli).Parse([]string{"--embedded=moo", "--not-embedded=foo"})
assert.NoError(t, err)
assert.Equal(t, "moo", cli.Embedded)
assert.Equal(t, "foo", cli.NotEmbedded)
}
func TestSliceWithDisabledSeparator(t *testing.T) {
var cli struct {
Flag []string `sep:"none"`
}
_, err := mustNew(t, &cli).Parse([]string{"--flag=a,b", "--flag=b,c"})
assert.NoError(t, err)
assert.Equal(t, []string{"a,b", "b,c"}, cli.Flag)
}
func TestMultilineMessage(t *testing.T) {
tests := []struct {
name string
text string
want string
}{
{"Simple", "hello\nworld", "test: hello\n world\n"},
{"WithNewline", "hello\nworld\n", "test: hello\n world\n"},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
w := &bytes.Buffer{}
var cli struct{}
p := mustNew(t, &cli, kong.Writers(w, w))
p.Printf("%s", test.text)
assert.Equal(t, test.want, w.String())
})
}
}
type cmdWithRun struct {
Arg string `arg:""`
}
func (c *cmdWithRun) Run(key string) error {
c.Arg += key
if key == "ERROR" {
return fmt.Errorf("ERROR")
}
return nil
}
type parentCmdWithRun struct {
Flag string
SubCommand struct {
Arg string `arg:""`
} `cmd:""`
}
func (p *parentCmdWithRun) Run(key string) error {
p.SubCommand.Arg += key
return nil
}
type grammarWithRun struct {
One cmdWithRun `cmd:""`
Two cmdWithRun `cmd:""`
Three parentCmdWithRun `cmd:""`
}
func TestRun(t *testing.T) {
cli := &grammarWithRun{}
p := mustNew(t, cli)
ctx, err := p.Parse([]string{"one", "two"})
assert.NoError(t, err)
err = ctx.Run("hello")
assert.NoError(t, err)
assert.Equal(t, "twohello", cli.One.Arg)
ctx, err = p.Parse([]string{"two", "three"})
assert.NoError(t, err)
err = ctx.Run("ERROR")
assert.Error(t, err)
ctx, err = p.Parse([]string{"three", "sub-command", "arg"})
assert.NoError(t, err)
err = ctx.Run("ping")
assert.NoError(t, err)
assert.Equal(t, "argping", cli.Three.SubCommand.Arg)
}
type failCmd struct{}
func (f failCmd) Run() error {
return errors.New("this command failed")
}
func TestPassesThroughOriginalCommandError(t *testing.T) {
var cli struct {
Fail failCmd `kong:"cmd"`
}
p := mustNew(t, &cli)
ctx, _ := p.Parse([]string{"fail"})
err := ctx.Run()
assert.Error(t, err)
assert.Equal(t, err.Error(), "this command failed")
}
func TestInterpolationIntoModel(t *testing.T) {
var cli struct {
Flag string `default:"${default_value}" help:"Help, I need ${somebody}" enum:"${enum}"`
EnumRef string `enum:"a,b" required:"" help:"One of ${enum}"`
EnvRef string `env:"${env}" help:"God ${env}"`
}
_, err := kong.New(&cli)
assert.Error(t, err)
p, err := kong.New(&cli, kong.Vars{
"default_value": "Some default value.",
"somebody": "chickens!",
"enum": "a,b,c,d",
"env": "SAVE_THE_QUEEN",
})
assert.NoError(t, err)
assert.Equal(t, 4, len(p.Model.Flags))
flag := p.Model.Flags[1]
flag2 := p.Model.Flags[2]
flag3 := p.Model.Flags[3]
assert.Equal(t, "Some default value.", flag.Default)
assert.Equal(t, "Help, I need chickens!", flag.Help)
assert.Equal(t, map[string]bool{"a": true, "b": true, "c": true, "d": true}, flag.EnumMap())
assert.Equal(t, []string{"a", "b", "c", "d"}, flag.EnumSlice())
assert.Equal(t, "One of a,b", flag2.Help)
assert.Equal(t, []string{"SAVE_THE_QUEEN"}, flag3.Envs)
assert.Equal(t, "God SAVE_THE_QUEEN", flag3.Help)
}
func TestIssue244(t *testing.T) {
type Config struct {
Project string `short:"p" env:"CI_PROJECT_ID" help:"Environment variable: ${env}"`
}
w := &strings.Builder{}
k := mustNew(t, &Config{}, kong.Exit(func(int) {}), kong.Writers(w, w))
_, err := k.Parse([]string{"--help"})
assert.NoError(t, err)
assert.Contains(t, w.String(), `Environment variable: CI_PROJECT_ID`)
}
func TestErrorMissingArgs(t *testing.T) {
var cli struct {
One string `arg:""`
Two string `arg:""`
}
p := mustNew(t, &cli)
_, err := p.Parse(nil)
assert.Error(t, err)
assert.Equal(t, "expected \"<one> <two>\"", err.Error())
}
func TestBoolOverride(t *testing.T) {
var cli struct {
Flag bool `default:"true"`
}
p := mustNew(t, &cli)
_, err := p.Parse([]string{"--flag=false"})
assert.NoError(t, err)
_, err = p.Parse([]string{"--flag", "false"})
assert.Error(t, err)
}
func TestAnonymousPrefix(t *testing.T) {
type Anonymous struct {
Flag string
}
var cli struct {
Anonymous `prefix:"anon-"`
}
p := mustNew(t, &cli)
_, err := p.Parse([]string{"--anon-flag=moo"})
assert.NoError(t, err)
assert.Equal(t, "moo", cli.Flag)
}
type TestInterface interface {
SomeMethod()
}
type TestImpl struct {
Flag string
}
func (t *TestImpl) SomeMethod() {}
func TestEmbedInterface(t *testing.T) {
type CLI struct {
SomeFlag string
TestInterface
}
cli := &CLI{TestInterface: &TestImpl{}}
p := mustNew(t, cli)
_, err := p.Parse([]string{"--some-flag=foo", "--flag=yes"})
assert.NoError(t, err)
assert.Equal(t, "foo", cli.SomeFlag)
assert.Equal(t, "yes", cli.TestInterface.(*TestImpl).Flag) //nolint
}
func TestExcludedField(t *testing.T) {
var cli struct {
Flag string
Excluded string `kong:"-"`
}
p := mustNew(t, &cli)
_, err := p.Parse([]string{"--flag=foo"})
assert.NoError(t, err)
_, err = p.Parse([]string{"--excluded=foo"})
assert.Error(t, err)
}
func TestUnnamedFieldEmbeds(t *testing.T) {
type Embed struct {
Flag string
}
var cli struct {
One Embed `prefix:"one-" embed:""`
Two Embed `prefix:"two-" embed:""`
}
buf := &strings.Builder{}
p := mustNew(t, &cli, kong.Writers(buf, buf), kong.Exit(func(int) {}))
_, err := p.Parse([]string{"--help"})
assert.NoError(t, err)
assert.Contains(t, buf.String(), `--one-flag=STRING`)
assert.Contains(t, buf.String(), `--two-flag=STRING`)
}
func TestHooksCalledForDefault(t *testing.T) {
var cli struct {
Flag hookValue `default:"default"`
}
ctx := &hookContext{}
_, err := mustNew(t, &cli, kong.Bind(ctx)).Parse(nil)
assert.NoError(t, err)
assert.Equal(t, "default", string(cli.Flag))
assert.Equal(t, []string{"before:default", "after:default"}, ctx.values)
}
func TestEnum(t *testing.T) {
var cli struct {
Flag string `enum:"a,b,c" required:""`
}
_, err := mustNew(t, &cli).Parse([]string{"--flag", "d"})
assert.EqualError(t, err, "--flag must be one of \"a\",\"b\",\"c\" but got \"d\"")
}
func TestEnumMeaningfulOrder(t *testing.T) {
var cli struct {
Flag string `enum:"first,second,third,fourth,fifth" required:""`
}
_, err := mustNew(t, &cli).Parse([]string{"--flag", "sixth"})
assert.EqualError(t, err, "--flag must be one of \"first\",\"second\",\"third\",\"fourth\",\"fifth\" but got \"sixth\"")
}
type commandWithHook struct {
value string
}
func (c *commandWithHook) AfterApply(cli *cliWithHook) error {
c.value = cli.Flag
return nil
}
type cliWithHook struct {
Flag string
Command commandWithHook `cmd:""`
}
func (c *cliWithHook) AfterApply(ctx *kong.Context) error {
ctx.Bind(c)
return nil
}
func TestParentBindings(t *testing.T) {
cli := &cliWithHook{}
_, err := mustNew(t, cli).Parse([]string{"command", "--flag=foo"})
assert.NoError(t, err)
assert.Equal(t, "foo", cli.Command.value)
}
func TestNumericParamErrors(t *testing.T) {
var cli struct {
Name string
}
parser := mustNew(t, &cli)
_, err := parser.Parse([]string{"--name", "-10"})
assert.EqualError(t, err, `--name: expected string value but got "-10" (short flag); perhaps try --name="-10"?`)
}
func TestDefaultValueIsHyphen(t *testing.T) {
var cli struct {
Flag string `default:"-"`
}
p := mustNew(t, &cli)
_, err := p.Parse(nil)
assert.NoError(t, err)
assert.Equal(t, "-", cli.Flag)
}
func TestDefaultEnumValidated(t *testing.T) {
var cli struct {
Flag string `default:"invalid" enum:"valid"`
}
p := mustNew(t, &cli)
_, err := p.Parse(nil)
assert.EqualError(t, err, "--flag must be one of \"valid\" but got \"invalid\"")
}
func TestEnvarEnumValidated(t *testing.T) {
var cli struct {
Flag string `env:"FLAG" required:"" enum:"valid"`
}
p := newEnvParser(t, &cli, envMap{
"FLAG": "invalid",
})
_, err := p.Parse(nil)
assert.EqualError(t, err, "--flag must be one of \"valid\" but got \"invalid\"")
}
func TestXor(t *testing.T) {
var cli struct {
Hello bool `xor:"another"`
One bool `xor:"group"`
Two string `xor:"group"`
}
p := mustNew(t, &cli)
_, err := p.Parse([]string{"--hello", "--one", "--two=hi"})
assert.EqualError(t, err, "--one and --two can't be used together")
p = mustNew(t, &cli)
_, err = p.Parse([]string{"--one", "--hello"})
assert.NoError(t, err)
}
func TestAnd(t *testing.T) {
var cli struct {
Hello bool `and:"another"`
One bool `and:"group"`
Two string `and:"group"`
}
p := mustNew(t, &cli)
_, err := p.Parse([]string{"--hello", "--one"})
assert.EqualError(t, err, "--one and --two must be used together")
p = mustNew(t, &cli)
_, err = p.Parse([]string{"--one", "--two=hi", "--hello"})
assert.NoError(t, err)
}
func TestXorChild(t *testing.T) {
var cli struct {
One bool `xor:"group"`