refex

README

This tool aims to provide regex based refactoring of Go code.

Warnings:

• This is currently an experiment/itch scratch
• There are likely many many corner cases or even common use-cases not yet covered

Examples

Replace any number of params using 1 wildcard

$ refex -b 'statsd.Count1($1$)' -a 'stats.D.Count1($1$)' mycode.go

Before:

package mypackage

func something() {
	statsd.Count1("call")
	statsd.Count1("me")
	statsd.Count1("baby")
}

After:

package mypackage

func something() {
	stats.D.Count1("call")
	stats.D.Count1("me")
	stats.D.Count1("baby")
}

Replace 2 params using 2 wildcards

$ refex -b 'statsd.Count1($1$, $2$)' -a 'stats.D.Count1($1$, $2$)' mycode.go

Before:

package mypackage

func something() {
	statsd.Count1("don't", "call")
	statsd.Count1("me", "baby")
}

After:

package mypackage

func something() {
	stats.D.Count1("don't", "call")
	stats.D.Count1("me", "baby")
}

Replace 2 params using 2 wildcards but change the order

$ refex -b 'statsd.Count1($1$, $2$)' -a 'stats.D.Count1($2$, $1$)' mycode.go

Before:

package mypackage

func something() {
	statsd.Count1("don't", "call")
	statsd.Count1("me", "baby")
}

After:

package mypackage

func something() {
	stats.D.Count1("call", "don't")
	stats.D.Count1("baby", "me")
}

Provided examples

• $ refex -d -b 'rand.Intn($1$)' -a 'rand.Int63n($1$)' test-data/example1.go
• $ refex -d -b 'fmt.Print($1$)' -a 'fmt.Fprintf(os.Stderr, $1$)' test-data/example2.go

Notes:

• While you can move the params, some combinations won't work. For example: fmt.Fprintf(os.Stderr, "fu") // $1$ will work however println(fmt.Sprintf("fu")) // $1$ will not, because of the nested brackets