example.go

package main

import (
        "github.com/gsp-lang/stdlib/fmt"
        "github.com/gsp-lang/gsp/core"
        "github.com/gsp-lang/stdlib/prelude"
        "github.com/gsp-lang/stdlib/net/http"
)

func hello(w, r core.Any) core.Any {
        fmt.Fprintf(w, "hello")
        return nil
}
func main() {
        http.HandleFunc("/", hello)
        http.ListenAndServe(":9090", nil)
}

var _ = prelude.Len

example.gsp

; Copy into example.gsp
(ns main
    "/fmt"
    "/net/http")

(def hello (fn [w r]
    (fmt/fprintf w "hello")
    ()))

(def main (fn []
    (http/handle-func "/" hello)
    (http/listen-and-serve ":9090" nil)))