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Forkers

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pretty's Issues

formatting of maps is invalid go code 

package main

import (
	"fmt"

	"github.com/kr/pretty"
)

type A struct {
	B *B
}

type B struct {
	M map[string]string
}

func main() {
	a := &A{B: &B{M: map[string]string{}}}
	fmt.Printf("%# v\n", pretty.Formatter(a))
        //prints out
	/*
		&main.A{
		    B:  &main.B{
		        M:  {},
		    },
		}
	*/
        //This contains a syntax error
	c := &A{
		B: &B{
			M: {},
		},
	}
}

PANIC=Format method: runtime error: invalid memory address or nil pointer dereference with go 1.17

When I run the following short script with Go 1.17 it prints a PANIC=Format method message

package main

import (
	"github.com/kr/pretty"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func main() {
	o := corev1.Secret{
		ObjectMeta: metav1.ObjectMeta{
			Name: "foo",
		},
	}
	pretty.Println(o)
}
$ go1.16.1 run ./
v1.Secret{
    TypeMeta:   v1.TypeMeta{},
    ObjectMeta: v1.ObjectMeta{
        Name:                       "foo",
        GenerateName:               "",
        Namespace:                  "",
        SelfLink:                   "",
        UID:                        "",
        ResourceVersion:            "",
        Generation:                 0,
        CreationTimestamp:          v1.Time{},
        DeletionTimestamp:          (*v1.Time)(nil),
        DeletionGracePeriodSeconds: (*int64)(nil),
        Labels:                     {},
        Annotations:                {},
        OwnerReferences:            nil,
        Finalizers:                 nil,
        ClusterName:                "",
        ManagedFields:              nil,
    },
    Immutable:  (*bool)(nil),
    Data:       {},
    StringData: {},
    Type:       "",
}

$ go1.17 run ./
v1.Secret{
%!v(PANIC=Format method: runtime error: invalid memory address or nil pointer dereference)

Allow an option for 'deterministic' iteration order for map prints

Go (since 1.1) is well-known for having randomized map iteration order.

When iterating over a map with a range loop, the iteration order is not specified and is not guaranteed to be the same from one iteration to the next. Since Go 1 the runtime randomizes map iteration order, as programmers relied on the stable iteration order of the previous implementation.
https://blog.golang.org/go-maps-in-action

I actually use this kr/pretty module to do a simple string compare and found that the ordering is randomized.

Parameters: {\"date\":\"2020-08-20\", \"digit\":\"123\"}
vs

Parameters: {\"digit\":\"123\", \"date\":\"2020-08-20\"}

I am here requesting an option for the user to choose if they want to iterate map in an deterministic order or not. (By default, it should be not deterministic as recommended practice by Go)

tests fail: reflect.Value.Interface: cannot return value obtained from unexported field or method 

~/.local/src/github.com/kr/pretty $ go test
--- FAIL: TestDiff-5 (0.00 seconds)
diff_test.go:49:    diffing pretty.S{A: 0, S:(*pretty.S)(nil), I:interface {}(nil), C:[]int(nil)}
diff_test.go:50:    with    pretty.S{A: 0, S:(*pretty.S)(nil), I:interface {}(nil), C:[]int{ 1}}
diff_test.go:74:    unexpected: C: []int(nil) != []int{1}
diff_test.go:74:    missing: C: []int{} != []int{1}
--- FAIL: TestGoSyntax-5 (0.00 seconds)
formatter_test.go:99:   expected "F(5)"
formatter_test.go:100:  got      "5"
formatter_test.go:101:  expraw F(5)
formatter_test.go:102:  gotraw 5
formatter_test.go:99:   expected "pretty.LongStructTypeName{\n\tlongFieldName:      pretty.LongStructTypeName{},\n\totherLongFieldName: \"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP\" +\n\t\"QRSTUVWXYZ0123456789\",\n}"
formatter_test.go:100:  got      "pretty.LongStructTypeName{\n\tlongFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method)"
formatter_test.go:101:  expraw pretty.LongStructTypeName{
            longFieldName:      pretty.LongStructTypeName{},
            otherLongFieldName: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP" +
            "QRSTUVWXYZ0123456789",
        }
formatter_test.go:102:  gotraw pretty.LongStructTypeName{
            longFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method)
formatter_test.go:99:   expected "&pretty.LongStructTypeName{\n\tlongFieldName:      &pretty.LongStructTypeName{},\n\totherLongFieldName: (*pretty.LongStructTypeName)(nil),\n}"
formatter_test.go:100:  got      "&pretty.LongStructTypeName{\n\tlongFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method)"
formatter_test.go:101:  expraw &pretty.LongStructTypeName{
            longFieldName:      &pretty.LongStructTypeName{},
            otherLongFieldName: (*pretty.LongStructTypeName)(nil),
        }
formatter_test.go:102:  gotraw &pretty.LongStructTypeName{
            longFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method)
formatter_test.go:99:   expected "[]pretty.LongStructTypeName{\n\t{},\n\t{longFieldName:3, otherLongFieldName:3},\n\t{\n\t\tlongFieldName:      \"abcdefghijklmnopqrstuvwxyzABCDEFGH\" +\n\t\t\"IJKLMNOPQRSTUVWXYZ0123456789\",\n\t\totherLongFieldName: <nil>,\n\t},\n}"
formatter_test.go:100:  got      "[]pretty.LongStructTypeName{\n\t{},\n\t{longFieldName:3, otherLongFieldName:3},\n\t{\n\t\tlongFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method),\n}"
formatter_test.go:101:  expraw []pretty.LongStructTypeName{
            {},
            {longFieldName:3, otherLongFieldName:3},
            {
                longFieldName:      "abcdefghijklmnopqrstuvwxyzABCDEFGH" +
                "IJKLMNOPQRSTUVWXYZ0123456789",
                otherLongFieldName: <nil>,
            },
        }
formatter_test.go:102:  gotraw []pretty.LongStructTypeName{
            {},
            {longFieldName:3, otherLongFieldName:3},
            {
                longFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method),
        }
formatter_test.go:99:   expected "[]interface { }{\n\tpretty.LongStructTypeName{},\n\t[]byte{0x1, 0x2, 0x3},\n\tpretty.T{x:3, y:4},\n\tpretty.LongStructTypeName{\n\t\tlongFieldName:      \"abcdefghijklmnopqrstuvwxyzABCDEFGH\" +\n\t\t\"IJKLMNOPQRSTUVWXYZ0123456789\",\n\t\totherLongFieldName: <nil>,\n\t},\n}"
formatter_test.go:100:  got      "[]interface {}{\n\tpretty.LongStructTypeName{},\n\t[]byte{0x1, 0x2, 0x3},\n\tpretty.T{x:3, y:4},\n\tpretty.LongStructTypeName{\n\t\tlongFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method),\n}"
formatter_test.go:101:  expraw []interface { }{
            pretty.LongStructTypeName{},
            []byte{0x1, 0x2, 0x3},
            pretty.T{x:3, y:4},
            pretty.LongStructTypeName{
                longFieldName:      "abcdefghijklmnopqrstuvwxyzABCDEFGH" +
                "IJKLMNOPQRSTUVWXYZ0123456789",
                otherLongFieldName: <nil>,
            },
        }
formatter_test.go:102:  gotraw []interface {}{
            pretty.LongStructTypeName{},
            []byte{0x1, 0x2, 0x3},
            pretty.T{x:3, y:4},
            pretty.LongStructTypeName{
                longFieldName:      %v(PANIC=reflect.Value.Interface: cannot return value obtained from unexported field or method),
        }
FAIL
exit status 1
FAIL    github.com/kr/pretty    0.004s

Support fuzzy matching for floating point types

Hi,

I have a feature request: When looking for differences between structures that contain floating point numbers it is often nice to not require exact matches, i.e. one can often treat the the values as equal if they are within say 1% of each other. It would be nice if the diff interface could support this kind of fuzzy matching.

Diff doesn't return difference b/w nil of slice and empty slice 

package main

import (
	"fmt"
	"reflect"

	"github.com/kr/pretty"
)

func main() {
	var s1 []int
	s2 := []int{}
	fmt.Println(pretty.Diff(s1, s2))
	fmt.Printf("Is %#v deep equal to %#v ? %v\n", s1, s2, reflect.DeepEqual(s1, s2))
}

output

[]
Is []int(nil) deep equal to []int{} ? false

Panic when private fields differ

Executing the following code:

package main

import (
        "fmt"
        "github.com/kr/pretty"
)

type Foo struct {
        name string
}

func main() {
        fmt.Println(pretty.Diff(Foo{name: "foo"}, Foo{name: "bar"}))
}

Panics with the message:

panic: reflect.Value.Interface: cannot return value obtained from unexported field or method

I realize it may not be possible to actually produce the diff on private fields, but I doubt that a panic is what's intended.

%s stopped working correctly

This correctly prints foo up to add1dbc, and prints &{%!s(int=1)} after c49dea8:

package main

import "github.com/kr/pretty"

type T struct{ I int }

func (v *T) String() string { return "foo" }

func main() { pretty.Printf("%s\n", &T{1}) }

Time values are unweildy

I just printed a time field and got this out. I understand that might be the desired behaviour in some cases, but it would be nice if there was a way to specify that a given type should have a simplified pretty form - this is a bit silly.

mytimefield: {
        sec:  63547322631,
        nsec: 0x1ec3a8c8,
        loc:  &time.Location{
            name: "Local",
            zone: {
                {name:"BST", offset:3600, isDST:true},
                {name:"GMT", offset:0, isDST:false},
                {name:"BDST", offset:7200, isDST:true},
                {name:"BST", offset:3600, isDST:false},
                {name:"BST", offset:3600, isDST:true},
                {name:"GMT", offset:0, isDST:false},
                {name:"GMT", offset:0, isDST:false},
            },
            tx: {
                {when:-1691964000, index:0x0, isstd:true, isutc:false},
                {when:-1680472800, index:0x1, isstd:true, isutc:false},
                {when:-1664143200, index:0x0, isstd:true, isutc:false},
                {when:-1650146400, index:0x1, isstd:false, isutc:false},
                {when:-1633903200, index:0x0, isstd:true, isutc:true},
                {when:-1617487200, index:0x1, isstd:true, isutc:true},
                {when:-1601848800, index:0x0, isstd:false, isutc:false},
                {when:-1586037600, index:0x1, isstd:false, isutc:false},
                {when:-1570399200, index:0x0, isstd:false, isutc:false},
                {when:-1552168800, index:0x1, isstd:false, isutc:false},
                {when:-1538344800, index:0x0, isstd:false, isutc:false},
                {when:-1522533600, index:0x1, isstd:false, isutc:false},
                {when:-1507500000, index:0x0, isstd:false, isutc:false},
                {when:-1490565600, index:0x1, isstd:false, isutc:false},
                {when:-1473631200, index:0x0, isstd:false, isutc:false},
                {when:-1460930400, index:0x1, isstd:false, isutc:false},
                {when:-1442786400, index:0x0, isstd:false, isutc:false},
                {when:-1428876000, index:0x1, isstd:false, isutc:false},
                {when:-1410732000, index:0x0, isstd:false, isutc:false},
                {when:-1396216800, index:0x1, isstd:false, isutc:false},
                {when:-1379282400, index:0x0, isstd:false, isutc:false},
                {when:-1364767200, index:0x1, isstd:false, isutc:false},
                {when:-1348437600, index:0x0, isstd:false, isutc:false},
                {when:-1333317600, index:0x1, isstd:false, isutc:false},
                {when:-1315778400, index:0x0, isstd:false, isutc:false},
                {when:-1301263200, index:0x1, isstd:false, isutc:false},
                {when:-1284328800, index:0x0, isstd:false, isutc:false},
                {when:-1269813600, index:0x1, isstd:false, isutc:false},
                {when:-1253484000, index:0x0, isstd:false, isutc:false},
                {when:-1238364000, index:0x1, isstd:false, isutc:false},
                {when:-1221429600, index:0x0, isstd:false, isutc:false},
                {when:-1206914400, index:0x1, isstd:false, isutc:false},
                {when:-1189980000, index:0x0, isstd:false, isutc:false},
                {when:-1175464800, index:0x1, isstd:false, isutc:false},
                {when:-1159135200, index:0x0, isstd:false, isutc:false},
                {when:-1143410400, index:0x1, isstd:false, isutc:false},
                {when:-1126476000, index:0x0, isstd:false, isutc:false},
                {when:-1111960800, index:0x1, isstd:false, isutc:false},
                {when:-1095631200, index:0x0, isstd:false, isutc:false},
                {when:-1080511200, index:0x1, isstd:false, isutc:false},
                {when:-1063576800, index:0x0, isstd:false, isutc:false},
                {when:-1049061600, index:0x1, isstd:false, isutc:false},
                {when:-1032127200, index:0x0, isstd:false, isutc:false},
                {when:-1017612000, index:0x1, isstd:false, isutc:false},
                {when:-1001282400, index:0x0, isstd:false, isutc:false},
                {when:-986162400, index:0x1, isstd:false, isutc:false},
                {when:-969228000, index:0x0, isstd:false, isutc:false},
                {when:-950479200, index:0x1, isstd:false, isutc:false},
                {when:-942012000, index:0x0, isstd:false, isutc:false},
                {when:-904518000, index:0x2, isstd:false, isutc:false},
                {when:-896050800, index:0x0, isstd:false, isutc:false},
                {when:-875487600, index:0x2, isstd:false, isutc:false},
                {when:-864601200, index:0x0, isstd:false, isutc:false},
                {when:-844038000, index:0x2, isstd:false, isutc:false},
                {when:-832546800, index:0x0, isstd:false, isutc:false},
                {when:-812588400, index:0x2, isstd:false, isutc:false},
                {when:-798073200, index:0x0, isstd:false, isutc:false},
                {when:-781052400, index:0x2, isstd:false, isutc:false},
                {when:-772066800, index:0x0, isstd:false, isutc:false},
                {when:-764805600, index:0x1, isstd:false, isutc:false},
                {when:-748476000, index:0x0, isstd:false, isutc:false},
                {when:-733356000, index:0x1, isstd:false, isutc:false},
                {when:-719445600, index:0x0, isstd:false, isutc:false},
                {when:-717030000, index:0x2, isstd:false, isutc:false},
                {when:-706748400, index:0x0, isstd:false, isutc:false},
                {when:-699487200, index:0x1, isstd:false, isutc:false},
                {when:-687996000, index:0x0, isstd:false, isutc:false},
                {when:-668037600, index:0x1, isstd:false, isutc:false},
                {when:-654732000, index:0x0, isstd:false, isutc:false},
                {when:-636588000, index:0x1, isstd:false, isutc:false},
                {when:-622072800, index:0x0, isstd:false, isutc:false},
                {when:-605743200, index:0x1, isstd:false, isutc:false},
                {when:-590623200, index:0x0, isstd:false, isutc:false},
                {when:-574293600, index:0x1, isstd:false, isutc:false},
                {when:-558568800, index:0x0, isstd:false, isutc:false},
                {when:-542239200, index:0x1, isstd:false, isutc:false},
                {when:-527119200, index:0x0, isstd:false, isutc:false},
                {when:-512604000, index:0x1, isstd:false, isutc:false},
                {when:-496274400, index:0x0, isstd:false, isutc:false},
                {when:-481154400, index:0x1, isstd:false, isutc:false},
                {when:-464220000, index:0x0, isstd:false, isutc:false},
                {when:-449704800, index:0x1, isstd:false, isutc:false},
                {when:-432165600, index:0x0, isstd:false, isutc:false},
                {when:-417650400, index:0x1, isstd:false, isutc:false},
                {when:-401320800, index:0x0, isstd:false, isutc:false},
                {when:-386200800, index:0x1, isstd:false, isutc:false},
                {when:-369266400, index:0x0, isstd:false, isutc:false},
                {when:-354751200, index:0x1, isstd:false, isutc:false},
                {when:-337816800, index:0x0, isstd:false, isutc:false},
                {when:-323301600, index:0x1, isstd:false, isutc:false},
                {when:-306972000, index:0x0, isstd:false, isutc:false},
                {when:-291852000, index:0x1, isstd:false, isutc:false},
                {when:-276732000, index:0x0, isstd:false, isutc:false},
                {when:-257983200, index:0x1, isstd:false, isutc:false},
                {when:-245282400, index:0x0, isstd:false, isutc:false},
                {when:-226533600, index:0x1, isstd:false, isutc:false},
                {when:-213228000, index:0x0, isstd:false, isutc:false},
                {when:-195084000, index:0x1, isstd:false, isutc:false},
                {when:-182383200, index:0x0, isstd:false, isutc:false},
                {when:-163634400, index:0x1, isstd:false, isutc:false},
                {when:-150933600, index:0x0, isstd:false, isutc:false},
                {when:-132184800, index:0x1, isstd:false, isutc:false},
                {when:-119484000, index:0x0, isstd:false, isutc:false},
                {when:-100735200, index:0x1, isstd:false, isutc:false},
                {when:-88034400, index:0x0, isstd:false, isutc:false},
                {when:-68680800, index:0x1, isstd:false, isutc:false},
                {when:-59004000, index:0x0, isstd:false, isutc:false},
                {when:-37242000, index:0x3, isstd:false, isutc:false},
                {when:57722400, index:0x5, isstd:false, isutc:false},
                {when:69818400, index:0x0, isstd:false, isutc:false},
                {when:89172000, index:0x1, isstd:false, isutc:false},
                {when:101268000, index:0x0, isstd:false, isutc:false},
                {when:120621600, index:0x1, isstd:false, isutc:false},
                {when:132717600, index:0x0, isstd:false, isutc:false},
                {when:152071200, index:0x1, isstd:false, isutc:false},
                {when:164167200, index:0x0, isstd:false, isutc:false},
                {when:183520800, index:0x1, isstd:false, isutc:false},
                {when:196221600, index:0x0, isstd:false, isutc:false},
                {when:214970400, index:0x1, isstd:false, isutc:false},
                {when:227671200, index:0x0, isstd:false, isutc:false},
                {when:246420000, index:0x1, isstd:false, isutc:false},
                {when:259120800, index:0x0, isstd:false, isutc:false},
                {when:278474400, index:0x1, isstd:false, isutc:false},
                {when:290570400, index:0x0, isstd:false, isutc:false},
                {when:309924000, index:0x1, isstd:false, isutc:false},
                {when:322020000, index:0x0, isstd:false, isutc:false},
                {when:341373600, index:0x1, isstd:false, isutc:false},
                {when:354675600, index:0x4, isstd:false, isutc:false},
                {when:372819600, index:0x5, isstd:false, isutc:false},
                {when:386125200, index:0x4, isstd:false, isutc:false},
                {when:404269200, index:0x5, isstd:false, isutc:false},
                {when:417574800, index:0x4, isstd:false, isutc:false},
                {when:435718800, index:0x5, isstd:false, isutc:false},
                {when:449024400, index:0x4, isstd:false, isutc:false},
                {when:467773200, index:0x5, isstd:false, isutc:false},
                {when:481078800, index:0x4, isstd:false, isutc:false},
                {when:499222800, index:0x5, isstd:false, isutc:false},
                {when:512528400, index:0x4, isstd:false, isutc:false},
                {when:530672400, index:0x5, isstd:false, isutc:false},
                {when:543978000, index:0x4, isstd:false, isutc:false},
                {when:562122000, index:0x5, isstd:false, isutc:false},
                {when:575427600, index:0x4, isstd:false, isutc:false},
                {when:593571600, index:0x5, isstd:false, isutc:false},
                {when:606877200, index:0x4, isstd:false, isutc:false},
                {when:625626000, index:0x5, isstd:false, isutc:false},
                {when:638326800, index:0x4, isstd:false, isutc:false},
                {when:657075600, index:0x5, isstd:false, isutc:false},
                {when:670381200, index:0x4, isstd:false, isutc:false},
                {when:688525200, index:0x5, isstd:false, isutc:false},
                {when:701830800, index:0x4, isstd:false, isutc:false},
                {when:719974800, index:0x5, isstd:false, isutc:false},
                {when:733280400, index:0x4, isstd:false, isutc:false},
                {when:751424400, index:0x5, isstd:false, isutc:false},
                {when:764730000, index:0x4, isstd:false, isutc:false},
                {when:782874000, index:0x5, isstd:false, isutc:false},
                {when:796179600, index:0x4, isstd:false, isutc:false},
                {when:814323600, index:0x5, isstd:false, isutc:false},
                {when:820454400, index:0x6, isstd:false, isutc:false},
                {when:828234000, index:0x4, isstd:false, isutc:false},
                {when:846378000, index:0x5, isstd:false, isutc:false},
                {when:859683600, index:0x4, isstd:false, isutc:false},
                {when:877827600, index:0x5, isstd:false, isutc:false},
                {when:891133200, index:0x4, isstd:false, isutc:false},
                {when:909277200, index:0x5, isstd:false, isutc:false},
                {when:922582800, index:0x4, isstd:false, isutc:false},
                {when:941331600, index:0x5, isstd:false, isutc:false},
                {when:954032400, index:0x4, isstd:false, isutc:false},
                {when:972781200, index:0x5, isstd:false, isutc:false},
                {when:985482000, index:0x4, isstd:false, isutc:false},
                {when:1004230800, index:0x5, isstd:false, isutc:false},
                {when:1017536400, index:0x4, isstd:false, isutc:false},
                {when:1035680400, index:0x5, isstd:false, isutc:false},
                {when:1048986000, index:0x4, isstd:false, isutc:false},
                {when:1067130000, index:0x5, isstd:false, isutc:false},
                {when:1080435600, index:0x4, isstd:false, isutc:false},
                {when:1099184400, index:0x5, isstd:false, isutc:false},
                {when:1111885200, index:0x4, isstd:false, isutc:false},
                {when:1130634000, index:0x5, isstd:false, isutc:false},
                {when:1143334800, index:0x4, isstd:false, isutc:false},
                {when:1162083600, index:0x5, isstd:false, isutc:false},
                {when:1174784400, index:0x4, isstd:false, isutc:false},
                {when:1193533200, index:0x5, isstd:false, isutc:false},
                {when:1206838800, index:0x4, isstd:false, isutc:false},
                {when:1224982800, index:0x5, isstd:false, isutc:false},
                {when:1238288400, index:0x4, isstd:false, isutc:false},
                {when:1256432400, index:0x5, isstd:false, isutc:false},
                {when:1269738000, index:0x4, isstd:false, isutc:false},
                {when:1288486800, index:0x5, isstd:false, isutc:false},
                {when:1301187600, index:0x4, isstd:false, isutc:false},
                {when:1319936400, index:0x5, isstd:false, isutc:false},
                {when:1332637200, index:0x4, isstd:false, isutc:false},
                {when:1351386000, index:0x5, isstd:false, isutc:false},
                {when:1364691600, index:0x4, isstd:false, isutc:false},
                {when:1382835600, index:0x5, isstd:false, isutc:false},
                {when:1396141200, index:0x4, isstd:false, isutc:false},
                {when:1414285200, index:0x5, isstd:false, isutc:false},
                {when:1427590800, index:0x4, isstd:false, isutc:false},
                {when:1445734800, index:0x5, isstd:false, isutc:false},
                {when:1459040400, index:0x4, isstd:false, isutc:false},
                {when:1477789200, index:0x5, isstd:false, isutc:false},
                {when:1490490000, index:0x4, isstd:false, isutc:false},
                {when:1509238800, index:0x5, isstd:false, isutc:false},
                {when:1521939600, index:0x4, isstd:false, isutc:false},
                {when:1540688400, index:0x5, isstd:false, isutc:false},
                {when:1553994000, index:0x4, isstd:false, isutc:false},
                {when:1572138000, index:0x5, isstd:false, isutc:false},
                {when:1585443600, index:0x4, isstd:false, isutc:false},
                {when:1603587600, index:0x5, isstd:false, isutc:false},
                {when:1616893200, index:0x4, isstd:false, isutc:false},
                {when:1635642000, index:0x5, isstd:false, isutc:false},
                {when:1648342800, index:0x4, isstd:false, isutc:false},
                {when:1667091600, index:0x5, isstd:false, isutc:false},
                {when:1679792400, index:0x4, isstd:false, isutc:false},
                {when:1698541200, index:0x5, isstd:false, isutc:false},
                {when:1711846800, index:0x4, isstd:false, isutc:false},
                {when:1729990800, index:0x5, isstd:false, isutc:false},
                {when:1743296400, index:0x4, isstd:false, isutc:false},
                {when:1761440400, index:0x5, isstd:false, isutc:false},
                {when:1774746000, index:0x4, isstd:false, isutc:false},
                {when:1792890000, index:0x5, isstd:false, isutc:false},
                {when:1806195600, index:0x4, isstd:false, isutc:false},
                {when:1824944400, index:0x5, isstd:false, isutc:false},
                {when:1837645200, index:0x4, isstd:false, isutc:false},
                {when:1856394000, index:0x5, isstd:false, isutc:false},
                {when:1869094800, index:0x4, isstd:false, isutc:false},
                {when:1887843600, index:0x5, isstd:false, isutc:false},
                {when:1901149200, index:0x4, isstd:false, isutc:false},
                {when:1919293200, index:0x5, isstd:false, isutc:false},
                {when:1932598800, index:0x4, isstd:false, isutc:false},
                {when:1950742800, index:0x5, isstd:false, isutc:false},
                {when:1964048400, index:0x4, isstd:false, isutc:false},
                {when:1982797200, index:0x5, isstd:false, isutc:false},
                {when:1995498000, index:0x4, isstd:false, isutc:false},
                {when:2014246800, index:0x5, isstd:false, isutc:false},
                {when:2026947600, index:0x4, isstd:false, isutc:false},
                {when:2045696400, index:0x5, isstd:false, isutc:false},
                {when:2058397200, index:0x4, isstd:false, isutc:false},
                {when:2077146000, index:0x5, isstd:false, isutc:false},
                {when:2090451600, index:0x4, isstd:false, isutc:false},
                {when:2108595600, index:0x5, isstd:false, isutc:false},
                {when:2121901200, index:0x4, isstd:false, isutc:false},
                {when:2140045200, index:0x5, isstd:false, isutc:false},
            },
            cacheStart: 1396141200,
            cacheEnd:   1414285200,
            cacheZone:  &time.zone{name:"BST", offset:3600, isDST:true},
        },
    },

Reference looping causes recursion to fail to terminate, resulting in stack overflow

package main

import (
"fmt"

"github.com/kr/pretty"

)

func main() {
type MyStruct struct {
S []MyStruct
str string
}

var s MyStruct
for i := 1; i <= 3; i++ {
	s.S = append(s.S, MyStruct{})
}

slice2 := s.S
slice2 = append(slice2, MyStruct{str: "测试字符串"})
s.S[0].S = slice2

fmt.Printf("s.S:%v\n", pretty.Formatter(s.S))

}

it will fatal error: stack overflow

Option to defer to String() when present

Is it currently possible to get Formatter to use an object's String() when such a method is present? Would you consider a pr that added a new formatter that did this?

Include some screenshots

As this library is related to visual output, it'd be cool to see what you're going to get before downloading and trying it out.

Can non-nil interface fields be considered `nonzero`?

Hi there, thanks for making this package.

I observed this issue printing a complex data structure with several structs containing interface fields which could be one of many conforming types. A number of those types might be empty structs, where the type is the only relevant information (the zero value is the only value).

If the outer struct with an interface field is printed, the nonzero function returns false because the concrete value of the interface field is zero. An example playground showing this can be found here: https://go.dev/play/p/HjxnCorTQtj

For interface fields, would it be possible to mark the field as nonzero if the field is non-nil, rather than the value of what the field is pointing at?

Thanks!

package main

import (
	"fmt"

	"github.com/kr/pretty"
)

func main() {
	// This should print the zero value for A
	v := &A{Err: nil}
	pretty.Println(v)

	// This will print &main.FormatError{...}
	v.Err = &FormatError{"foo.go", 12}
	pretty.Println(v)

	// This SHOULD print &main.A{Err: main.LogicError{}}, but prints the zero value for A instead.
	v.Err = LogicError{}
	pretty.Println(v)
}

type A struct {
	Err error
}

type FormatError struct {
	File string
	Line int
}

func (err *FormatError) Error() string {
	return fmt.Sprintf("format error: %s:%d", err.File, err.Line)
}

type LogicError struct{}

func (LogicError) Error() string {
	return "logic error"
}

Output

&main.A{}
&main.A{
    Err: &main.FormatError{File:"foo.go", Line:12},
}
&main.A{}

Desired Output

&main.A{}
&main.A{
    Err: &main.FormatError{File:"foo.go", Line:12},
}
&main.A{
    Err: &main.LogicError{},
}

Add Sprint

Would you accept a pull request for

func Sprint(a ...interface{}) string

?

Print uint in decimal?

Same request as google/go-cmp#185, where the conclusion was to print all unsigned integers in decimal form, except uint8 and uintptr which would be printed in hex (see this change).
I think diff should have the same support as well.

Go version is very old

The current library uses Go language verion 1.12.

go 1.12

This version is very old.
Version 1.12 was released in February 2019 according to the Go's website, https://go.dev/project.
Today is February 2023. Four (4) years have passed !

Thank you.

reflect.Value.Interface: cannot return value obtained from unexported field or method

panic: reflect.Value.Interface: cannot return value obtained from unexported field or method [recovered]
panic: reflect.Value.Interface: cannot return value obtained from unexported field or method

goroutine 20 [running]:
testing.tRunner.func1(0xc8200ba3f0)
/usr/local/gosrc/src/testing/testing.go:450 +0x171
reflect.valueInterface(0x6d5a60, 0xc820222420, 0xe6, 0x1, 0x0, 0x0)
/usr/local/gosrc/src/reflect/value.go:912 +0xe7
reflect.Value.Interface(0x6d5a60, 0xc820222420, 0xe6, 0x0, 0x0)
/usr/local/gosrc/src/reflect/value.go:901 +0x48
github.com/kr/pretty.diffWriter.diff(0x7f6d2c25a078, 0xc820216440, 0xc82021a400, 0x10, 0x6d5a60, 0xc820222420, 0xe6, 0x6d5a60, 0xc8200a0bd0, 0xe6)
/root/go/src/github.com/kr/pretty/diff.go:63 +0x49b
github.com/kr/pretty.diffWriter.diff(0x7f6d2c25a078, 0xc820216440, 0xc82021a3d0, 0xc, 0x771a20, 0xc820222420, 0xd9, 0x771a20, 0xc8200a0bd0, 0xd9)
/root/go/src/github.com/kr/pretty/diff.go:87 +0x30cf
github.com/kr/pretty.diffWriter.diff(0x7f6d2c25a078, 0xc820216440, 0x7d5550, 0x9, 0x6c5660, 0xc8202101e0, 0xd7, 0x6c5660, 0xc82009a500, 0xd7)
/root/go/src/github.com/kr/pretty/diff.go:97 +0x2aff
github.com/kr/pretty.diffWriter.diff(0x7f6d2c25a078, 0xc820216440, 0x0, 0x0, 0x7839c0, 0xc8202101e0, 0xd9, 0x7839c0, 0xc82009a500, 0xd9)
/root/go/src/github.com/kr/pretty/diff.go:87 +0x30cf
github.com/kr/pretty.diffWriter.diff(0x7f6d2c25a078, 0xc820216440, 0x0, 0x0, 0x6b9240, 0xc8202101e0, 0x16, 0x6b9240, 0xc82009a500, 0x16)
/root/go/src/github.com/kr/pretty/diff.go:83 +0x1e51
github.com/kr/pretty.Fdiff(0x7f6d2c25a078, 0xc820216440, 0x6b9240, 0xc8202101e0, 0x6b9240, 0xc82009a500)
/root/go/src/github.com/kr/pretty/diff.go:25 +0x10e
github.com/kr/pretty.Diff(0x6b9240, 0xc8202101e0, 0x6b9240, 0xc82009a500, 0x0, 0x0, 0x0)
/root/go/src/github.com/kr/pretty/diff.go:19 +0xa0

When I try to sync dependencies for this I get an error.

go: could not create module cache: mkdir /usr/local/go/bin/pkg: permission denied

**this is only a problem with the dependency compilation in goland and it compiles and runs fine in command line
using go run *.go

I think it has something to do with the dependency management not finding this repo.

Newlines would be useful to separate differing fields

Input:

var thingA = map[int]int{
    1: 2,
    2: 3,
    3: 4,
}

var thingB = map[int]int{
    1: 1,
    2: 2,
}

pretty.Fdiff(w, thingA, thingB)

Output:

[3]: "<int Value>" != (missing)[2]: 3 != 2[1]: 2 != 1

In larger maps, this makes the output really unreadable. Would you accept a pull request to put each difference on its own line?

type compare

in function func (w diffPrinter) diff(av, bv reflect.Value)

at := av.Type()
bt := bv.Type()
if at != bt{

can this at be compared with bt directly? I suspect it should be at.String() != bt.String()

TestGoSyntax broken at v0.1.0 in Go 1.11 

~/src/golang.org/x/build$ go list -m github.com/kr/pretty
github.com/kr/pretty v0.1.0

~/src/golang.org/x/build$ go version
go version devel +55931b5e16 Mon Sep 24 12:55:24 2018 -0400 linux/amd64

~/src/golang.org/x/build$ go test github.com/kr/pretty
--- FAIL: TestGoSyntax (0.00s)
    formatter_test.go:170: expected "float64(1)"
    formatter_test.go:171: got      "float64(1.0)"
    formatter_test.go:172: expraw
        float64(1)
    formatter_test.go:173: gotraw
        float64(1.0)
    formatter_test.go:170: expected "(1+0i)"
    formatter_test.go:171: got      "(1.0+0.0i)"
    formatter_test.go:172: expraw
        (1+0i)
    formatter_test.go:173: gotraw
        (1.0+0.0i)
FAIL
FAIL    github.com/kr/pretty    0.019s

Minor golint issues 

$ golint ./...
vendor/github.com/kr/pretty/diff.go:36:6: exported type Printfer should have comment or be unexported
vendor/github.com/kr/pretty/diff.go:47:6: exported type Logfer should have comment or be unexported
vendor/github.com/kr/pretty/diff.go:177:1: receiver name d should be consistent with previous receiver name w for diffPrinter

Go 1.15: conversion from int to string yields a string of one rune

Go 1.15 rc1 on Fedora Rawhide

Testing    in: /builddir/build/BUILD/pretty-0.2.0/_build/src
         PATH: /builddir/build/BUILD/pretty-0.2.0/_build/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin
       GOPATH: /builddir/build/BUILD/pretty-0.2.0/_build:/usr/share/gocode
  GO111MODULE: off
      command: go test -buildmode pie -compiler gc -ldflags "-X github.com/kr/pretty/version=0.2.0 -extldflags '-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld '"
      testing: github.com/kr/pretty
github.com/kr/pretty
# github.com/kr/pretty
./formatter.go:40:9: conversion from int to string yields a string of one rune, not a string of digits (did you mean fmt.Sprint(x)?)
FAIL	github.com/kr/pretty [build failed]

See golang/go#32479

Arrays don't round-trip

package main

import (
"fmt"
"github.com/kr/pretty"
)

type Foo struct {
S []string
}

func main() {
actual := Foo{
S: []string{"a", "b", "c"},
}

fmt.Println(pretty.Sprint(actual))
/* Prints:
main.Foo{
    S:  {"a", "b", "c"},
}
*/

// Would error:
/*
  result := Foo{
      S:  {"a", "b", "c"},
  }
*/

}

Add License

Can you please add a license such as Apache 2, BSD, or MIT. Without a license we don't know the terms of the code for use in our own applications and libraries.

Until there is a license I can't use this package.

Tag a release?

Hi! I notice that this project doesn't have any tagged releases. Would you mind adding some SemVer-compatible release tags? It would really, really help those of us using dep and similar tools.

false positive in cycle check

Bug in cycle detection reported in #95. Thank you @alingse. This issue is to track the bug itself as opposed to the fix. Description below copied from #95.

use visited map[visit]int to check cycle might get some bad case.

the key reason was that, all the pp, p printer share a same map[visit]int

but when we process a struct refer a pointer value twice or more, this is not a cycle, it's just a repeat refer.

maybe use other helper data type for every branch when we call code pp = *p statement

maybe a slice is enough to detect.

branch 1 : [v1, v2, v3, v5]
branch 2 : [v1, v2, v3, v4]
branch 3 : [v1, v2, v3, v4, v1]

only branch3 should print a "CYCLIC REFERENCE"

PANIC=runtime error: comparing uncomparable type ...

On weekly.2012-02-07, I'm seeing an error when trying to print out a http.Client type.

package main

import "fmt"
import "github.com/kr/pretty.go"
import "net/http"

func main() {
    fmt.Printf("%# v\n", pretty.Formatter(new(http.Client)))
}

The following is printed when the program is executed.

&%v(PANIC=runtime error: comparing uncomparable type func(*http.Request, []*http.Request) error)

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