A method extraction tool for the Go language.

This work is in very early development. The goal is to provide a refactoring tool that can extract a method from Go source code.

See test_data to see what extractions are currently supported.

go get github.com/petergtz/goextract

Make sure $GOPATH/bin is in your $PATH.

Let's assume you have a file main.go, with the content:

1   package main
2
3   func g() {}
4   func h() {}
5   func i() {}
6
7   func f() {
8       g()
9       h()
10      i()
11  }

Then you can extract lines 9 and 10 into a function like this:

goextract main.go --selection 9:1-11:1 --function MyExtractedFunc

The output will look like this:

package test_data

1    func g() {}
2    func h() {}
3    func i() {}
4
5    func f() {
6        g()
7        MyExtractedFunc()
8    }
9
10    func MyExtractedFunc() {
11        h()
12        i()
13    }

goextract is quite smart in recognizing local variables or expression and will usually do the right thing during the extraction to make sure the logic of your code didn't change.

Please note that goextract doesn't handle comments correctly yet. If your code contains any kinds of comments anywhere, it's not recommended yet to use goextract.

There's currently a goextract extension for the Atom editor.

Support for other editors is planned.