如何进行fmt.Print（“在中心打印”）

Question

Is possible, with fmt.Println("...") to print a string with center alignement of the shell?

Answer 1

This code is managing to centre the text as long as the shell width is a known value. Its not quite 'pixel perfect', but I hope it helps.

If we break it down there are two bits of code to produce the format strings to pad right and then left.

fmt.Sprintf("%%-%ds", w/2)  // produces "%-55s"  which is pad left string
fmt.Sprintf("%%%ds", w/2)   // produces "%55s"   which is right pad

So the final Printf statement becomes

fmt.Printf("%-55s", fmt.Sprintf("%55s", "my string to centre")) 

The full code:

s := " in the middle"
w := 110 // shell width

fmt.Printf(fmt.Sprintf("%%-%ds", w/2), fmt.Sprintf(fmt.Sprintf("%%%ds", w/2),s))

Produces the following:

                                     in the middle

Link to play ground: play