Support `//go:generate`

[lesiw]

One of the limitations of the original Go Playground is that //go:generate directives are not evaluated before program execution. It might be useful to have a playground that permits experimentation with generated code.

Here's an example of a program using the stringer package, as demonstrated in the original blog post announcing go:generate.

package main

import "fmt"

//go:generate go run golang.org/x/tools/cmd/stringer@latest -type=Pill
type Pill int

const (
    Placebo Pill = iota
    Aspirin
    Ibuprofen
    Paracetamol
    Acetaminophen = Paracetamol
)

func main() {
    fmt.Println(Aspirin.String())
}

$ go generate && go build -o main && ./main
Aspirin

[github-actions[bot]]

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[x1unix]

So at the moment, Playground offers two modes:

• Run on Server - Runs program on original Go Playground servers. \ Original Go playground doesn't support go:generate.
• Run on Browser - Our API builds a WASM file for you which will be executed on browser. \ This also doesn't support running go:generate on build server for security reasons.

Regarding first mode - I suggest creating an issue in go's repo.

Regarding WASM - there is a plan to move Go compiler into a browser. This will resolve potential security concerns but still go:generate support will be limited to only running other Go packages.