英文:
Kubectl like output format for my cobra project
问题
我是你的中文翻译助手，以下是你要翻译的内容：
我是golang的新手，正在尝试使用cobra开发一个命令行工具。我想为用户提供类似kubectl的标志。作为第一步，我想实现kubectl的标准输出格式，像这样：
kubectl get pods -n mpo
NAME READY STATUS RESTARTS AGE
my-deployment-5588bf7844-n2nw7 1/1 Running 0 3d
my-deployment-5588bf7844-qcpsl 1/1 Running 0 3d
请问你能否指导我一个简单的示例项目（kubectl的GitHub项目对我来说太难理解了），或者提供一些代码，让我能够理解如何实现这种输出格式。
英文:
I am new to golang and trying to develop a commandline tool using cobra. I would like to provide flags like kubectl offers to it's users. As a first step i would like to implement kubectl standard format like this
kubectl get pods -n mpo
NAME READY STATUS RESTARTS AGE
my-deployment-5588bf7844-n2nw7 1/1 Running 0 3d
my-deployment-5588bf7844-qcpsl 1/1 Running 0 3d
Could please direct me to a simple example project (kubectl github project is too difficult for me to understand) or code where i could understand how to implement this output format.
答案1
得分: 2
你可以在Go语言中使用填充来格式化字符串，可以在字符串的两侧添加填充。请参考这篇文章中的示例。
下面的代码演示了如何对所有字符串进行右侧填充。第一列使用40个字符的填充，因为Pod名称可能很长。其他列只使用10个字符的填充。
fmt.Printf("%-40s %-10s %-10s\n", "NAME", "READY", "STATUS")
fmt.Printf("%-40s %-10s %-10s\n", "my-deployment-5588bf7844-n2nw7", " 1/1", "Running")
fmt.Printf("%-40s %-10s %-10s\n", "my-deployment-5588bf7844-n2nw7", " 1/1", "Running")
}
你也可以使用tabwriter来实现相同的效果，这可能是另一个更好的选择。
// io.Writer, minwidth, tabwidth, padding int, padchar byte, flags uint
w := tabwriter.NewWriter(os.Stdout, 10, 1, 5, ' ', 0)
fmt.Fprintln(w, "NAME\tREADY\tSTATUS")
fmt.Fprintln(w, "my-deployment-5588bf7844-n2nw7\t1/1\tRunning")
fmt.Fprintln(w, "my-deployment-5588bf7844-n2nw7\t1/1\tRunning")
w.Flush()
英文:
You can format strings in Go with padding on either side. See this post for example.
Below, I format all strings with right padding. The first column gets 40 char padding as the pod name might be long. The other columns get only 10 chars padding.
fmt.Printf("%-40s %-10s %-10s\n", "NAME", "READY", "STATUS")
fmt.Printf("%-40s %-10s %-10s\n", "my-deployment-5588bf7844-n2nw7", " 1/1", "Running")
fmt.Printf("%-40s %-10s %-10s\n", "my-deployment-5588bf7844-n2nw7", " 1/1", "Running")
}
https://play.golang.com/p/8ZZH5XmqTpR
That said, using tabwriter, may be another, potentially even better option.
// io.Writer, minwidth, tabwidth, padding int, padchar byte, flags uint
w := tabwriter.NewWriter(os.Stdout, 10, 1, 5, ' ', 0)
fmt.Fprintln(w, "NAME\tREADY\tSTATUS")
fmt.Fprintln(w, "my-deployment-5588bf7844-n2nw7\t1/1\tRunning")
fmt.Fprintln(w, "my-deployment-5588bf7844-n2nw7\t1/1\tRunning")
w.Flush()
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