有没有可以产生人类可读的JSON输出的golang的jq包装器? [英] Is there a jq wrapper for golang that can produce human readable JSON output?

查看:195
本文介绍了有没有可以产生人类可读的JSON输出的golang的jq包装器?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在编写一个在标准输出上输出JSON的go程序(我们称之为foo)。

  $ ./foo 
{id:uuid1,name:John Smith} {id:uuid2,name:Jane Smith}

使输出成为人类可读的,我必须将其输入到jq中:

  $ ./foo | jq。 

{
id:uuid1,
name:John Smith
}
{
id :uuid2
name:Jane Smith
}

有没有办法使用开源的jq包装来达到相同的结果?我试图找到一些,但他们通常包装过滤JSON输入的功能,而不是美化JSON输出。 encoding / json 软件包支持漂亮的输出-THE盒。您可以使用 json.MarshalIndent() 。或者,如果您使用 json.Encoder ,然后调用它的 Encoder.SetIndent( ) (自 Go 1.7 以来的新增内容)方法调用 Encoder.Encode()





$ b $ := map [string] interface {} {id:uuid1,name:John Smith}

data,err:= json.MarshalIndent(m,, )
if err!= nil {
panic(err)
}
fmt.Println(string(data))

enc:= json .NewEncoder(os.Stdout)
enc.SetIndent(,)
if err:= enc.Encode(m); err!= nil {
panic(err)
}

输出它在 Go Playground 上):

  {
id:uuid1,
name:John Smith
}
{
id:uuid1,
name:John Smith
}

如果您只想格式化准备好的JSON文本,则可以使用 json.Indent() 函数:

  src: =`{id:uuid1,name:John Smith}`

dst:=&; bytes.Buffer {}
如果err:= json.Indent (dst,[] byte(src),,); err!= nil {
panic(err)
}
fmt.Println(dst.String())

输出(在去游乐场试试) :

  {
id:uuid1,
name:John Smith

2 字符串这些 indent 函数的参数是:

 前缀,缩进字符串

解释在文档中:


JSON对象或数组中的每个元素都从一个以prefix开头的新缩进行开始,后跟一个或多个indentation嵌套缩进副本。

所以每一个换行符都会以前缀开头,后面跟着0个或更多个 indent ,这取决于嵌套级别。



如果您指定val他们是这样的:

  json.Indent(dst,[] byte(src),+, -  )

使用嵌入对象进行测试:

  src:=`{id:uuid1,name:John Smith,embedded::{fieldx:y}}`

dst:=&; bytes.Buffer {}
if err:= json.Indent(dst,[] byte(src),+, - ); err!= nil {
panic(err)
}
fmt.Println(dst.String())

输出(在去游乐场试试) :

  {
+ - id:uuid1,
+ - name: John Smith,
+ - embedded::{
+ - fieldx:y
+ - }
+}


I'm writing a go program (let's call it foo) that outputs JSON on the Standard Out.

$ ./foo
{"id":"uuid1","name":"John Smith"}{"id":"uuid2","name":"Jane Smith"}

In order to make the output human readable, I have to pipe it into jq like:

$ ./foo | jq .

{
"id":"uuid1",
"name": "John Smith"
}
{
"id":"uuid2"
"name": "Jane Smith"
}

Is there a way to achieve the same result using a jq wrapper that is open sourced? I tried finding some but they are usually wrapping the functionality for filtering JSON input not prettifying JSON output.

解决方案

The encoding/json package supports pretty output out-of-the-box. You may use json.MarshalIndent(). Or if you're using json.Encoder, then call its Encoder.SetIndent() (new since Go 1.7) method prior to calling Encoder.Encode().

Examples:

m := map[string]interface{}{"id": "uuid1", "name": "John Smith"}

data, err := json.MarshalIndent(m, "", "  ")
if err != nil {
    panic(err)
}
fmt.Println(string(data))

enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", "  ")
if err := enc.Encode(m); err != nil {
    panic(err)
}

Output (try it on the Go Playground):

{
  "id": "uuid1",
  "name": "John Smith"
}
{
  "id": "uuid1",
  "name": "John Smith"
}

If you just want to format a "ready" JSON text, you may use the json.Indent() function:

src := `{"id":"uuid1","name":"John Smith"}`

dst := &bytes.Buffer{}
if err := json.Indent(dst, []byte(src), "", "  "); err != nil {
    panic(err)
}
fmt.Println(dst.String())

Output (try it on the Go Playground):

{
  "id": "uuid1",
  "name": "John Smith"
}

The 2 string parameters to these indent functions are:

prefix, indent string

Explanation is in the docs:

Each element in a JSON object or array begins on a new, indented line beginning with prefix followed by one or more copies of indent according to the indentation nesting.

So each newline will be started with prefix, which will be followed by 0 or more copies of indent, depending on the nesting level.

It becomes clear and obvious if you specify values for them like this:

json.Indent(dst, []byte(src), "+", "-")

Testing it with embedded objects:

src := `{"id":"uuid1","name":"John Smith","embedded:":{"fieldx":"y"}}`

dst := &bytes.Buffer{}
if err := json.Indent(dst, []byte(src), "+", "-"); err != nil {
    panic(err)
}
fmt.Println(dst.String())

Output (try it on the Go Playground):

{
+-"id": "uuid1",
+-"name": "John Smith",
+-"embedded:": {
+--"fieldx": "y"
+-}
+}

这篇关于有没有可以产生人类可读的JSON输出的golang的jq包装器?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆