git.giacomolli.uk - onechat/blob - main.go

   1 package main
   2
   3 import (
   4         "context"
   5         "fmt"
   6         "os"
   7         "os/signal"
   8         "strings"
   9         "syscall"
  10 )
  11
  12 func main() {
  13         err := run()
  14         if err != nil {
  15                 fmt.Fprintln(os.Stderr, "onechat:", err)
  16                 os.Exit(1)
  17         }
  18 }
  19
  20 func run() error {
  21         ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
  22         defer cancel()
  23
  24         args := os.Args[1:]
  25         switch {
  26         case len(args) == 0:
  27                 _, err := fmt.Println("onechat")
  28                 if err != nil {
  29                         return err
  30                 }
  31         case len(args) == 1 && args[0] == "login":
  32                 err := login(ctx, os.Stdout)
  33                 if err != nil {
  34                         return err
  35                 }
  36         // A signal is the normal stop of the daemon and the client, so their
  37         // result does not include ctx.Err().
  38         case len(args) == 1 && args[0] == "daemon":
  39                 return daemon(ctx, os.Stdout)
  40         case len(args) == 1 && args[0] == "chat":
  41                 return chat(ctx, os.Stdin, os.Stdout)
  42         case len(args) > 0 && args[0] == "probe":
  43                 err := probe(ctx, args[1:], os.Stdout)
  44                 if err != nil {
  45                         return err
  46                 }
  47         default:
  48                 return fmt.Errorf("unknown command %q", strings.Join(args, " "))
  49         }
  50
  51         return ctx.Err()
  52 }