go get github.com/lunixbochs/og

You can update og to the latest version with og update.

og is a go frontend with additional features, such as a code preprocessor.

Use it as you would the existing go command, like go build or go run.

It also provides the following extra commands:

og help
...
    gen         generate preprocessed source tree
    parse       preprocess one source file
    update      update og command
...

• Preprocessor
  • Easily perform AST transformations on Go projects as they are built
  • Safe: will never modify or overwrite your existing files
  • Fast: adds almost no time to your project build
• Language Extensions

  • try(): reduces the if err != nil {} pattern to a single line.

      // before
      tmp, err := call()
      if err != nil {
          return nil, err
      }
      // after
      tmp := try(call())