Go Lang Struct Align Text

Question

I am using go programming

I have structs like this:

type person struct {  
   firstname string  
   lastname string  
   age int  
   address string  

}  

I want it to be aligned like this

type person struct {
   firstname string
   lastname  string
   age       int
   address   string

}  

and stuff like

const (  
    constant1 int = 1  
    c2 int = 2  
    const3 int = 3  
)    

to

const (    
    constant1   int = 1  
    c2          int = 2  
    const3      int = 3  
)   

I know align-regexp should help here, but i am unable to figure it out.

Answer 1

M-x gofmt does this. Here is the output applied to your examples.

package main

type person struct {
    firstname string
    lastname  string
    age       int
    address   string
}

const (
    constant1 int = 1
    c2        int = 2
    const3    int = 3
)

gofmt runs the external command on the buffer. Here is the output of the external command:

package main

type person struct {
    firstname string
    lastname  string
    age       int
    address   string
}

const (
    constant1 int = 1
    c2        int = 2
    const3    int = 3
)

This is with Go version go1.11.1.

You could also apply the gofmt command yourself using shell-command-on-region, which has nothing to do with the Emacs go mode and should show you whether the command itself works or not.