Compare gop with litter

[ysmood]

litter doesn't support colorized output, I created this issue 3 years ago on it, still unresolved: sanity-io/litter#27

Let's use real data to compare them, below is the data to print:

val := map[string]interface{}{
	"bool":   true,
	"number": 1 + 1i,
	"bytes":  []byte{97, 98, 99},
	"lines":  "multiline string\nline two",
	"slice":  []interface{}{1, 2},
	"time":   time.Now(),
	"struct": struct{ test int32 }{
		test: 13,
	},
}
val["slice"].([]interface{})[1] = val["slice"]

litter will output:

map[string]interface {}{
  "bool": true,
  "bytes": []uint8{
    97,
    98,
    99,
  },
  "lines": "multiline string\nline two",
  "number": complex128(1+1i),
  "slice": []interface {}{ // p0
    1,
    p0,
  },
  "struct": struct { test int32 }{},
  "time": time.Time{},
}

gop will output:

map[string]interface {}/* len=7 */{
    "bool": true,
    "bytes": []byte("abc")/* len=3 */,
    "lines": "" +
        "multiline string\n" +
        "line two"/* len=25 */,
    "number": 1+1i,
    "slice": []interface {}/* len=2 cap=2 */{
        1,
        gop.Circular("slice").([]interface {}),
    },
    "struct": struct { test int32 }{
        test: int32(13),
    },
    "time": gop.Time("2022-03-23T10:25:54.424021+08:00"),
}

• litter doesn't support colorized output
• litter doesn't print readable []byte
• litter is not able to print time data
• litter's output for circular data is not compilable, because p0 is undefined, and they have to guess the meaning of p0, but with gop user can jump to the definition of gop.Cyclic to read the doc.
• litter is not able to print the nested value of struct{ test int32 }
• litter doesn't use the shortest form to print the complex number
• litter doesn't split the multiline text block
• litter doesn't print the length of long string, map, and slice, etc