robo/cmd/rclient/main.go

package main

import (
	"bufio"
	"encoding/gob"
	"fmt"
	"net"
	"os"
	"strconv"
	"strings"

	"mcquay.me/robo"
)

const usage = "rsend <hostname>"

func main() {
	if len(os.Args) != 2 {
		fmt.Fprintf(os.Stderr, "%s\n", usage)
		os.Exit(1)
	}

	var err error
	var x, y float64
	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", os.Args[1], robo.Port))
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}

	enc := gob.NewEncoder(conn)

	s := bufio.NewScanner(os.Stdin)
	point := robo.Point{}
	for s.Scan() {
		txt := s.Text()
		parts := strings.Split(txt, ",")
		if len(parts) != 2 {
			err = fmt.Errorf("bad parse from stdin: %q", txt)
			break
		}
		x, err = strconv.ParseFloat(parts[0], 32)
		if err != nil {
			break
		}
		y, err = strconv.ParseFloat(parts[1], 32)
		if err != nil {
			break
		}
		point.X, point.Y = x, y

		fmt.Printf("sending: %s\n", txt)
		err = enc.Encode(&point)
		if err != nil {
			break
		}
	}
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}

	if err := s.Err(); err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}
}