Edit file in Vim over HTTP GET and PUT

vim-edit-over-http.go

package main

import (
	"io"
	"log"
	"net/http"
	"os"
	"sync"
)

func main() {
	l := log.New(os.Stdout, "", 0)
	d := Data{"/hello": []byte(`Hello, World!`)}
	s := newServer(l, d)

	addr := ":9999"

	l.Printf("Edit by running:\n vim http://127.0.0.1" + addr + "/hello\n")
	http.ListenAndServe(addr, s)
}

func newServer(l Logger, d Data) *Server {
	s := &Server{
		ServeMux: &http.ServeMux{},
		logger:   l,
		data:     d,
	}

	s.HandleFunc("GET /", s.get)
	s.HandleFunc("PUT /", s.put)

	return s
}

type Server struct {
	*http.ServeMux
	logger Logger
	mu     sync.RWMutex
	data   Data
}

func (s *Server) get(w http.ResponseWriter, r *http.Request) {
	s.mu.RLock()
	defer s.mu.RUnlock()

	path := r.URL.Path

	s.logger.Printf("GET %s\n", path)

	w.Write(s.data[r.URL.Path])
}

func (s *Server) put(w http.ResponseWriter, r *http.Request) {
	s.mu.Lock()
	defer s.mu.Unlock()

	path := r.URL.Path

	s.logger.Printf("PUT %s\n", path)

	if data, err := io.ReadAll(io.LimitReader(r.Body, 8192)); err == nil {
		s.data[path] = data
	}
}

type Data map[string][]byte

type Logger interface {
	Printf(format string, v ...interface{})
}

Related to seeing https://mastodon.sdf.org/@conorh/112458241797328014