hmm, tcp should work more like local...

args.go

@@ -10,13 +10,9 @@ import (
 
 var tcpAddr = flag.String("tcp", "", "foo")
 
-func args() {
-	flag.Parse()
-	if *tcpAddr != "" {
-		runTCPServer()
-		return
-	}
-	filename := flag.Args()[1]
+func runfile() {
+	filename := flag.Args()[0]
+	fmt.Println(filename)
 	f, err := os.Open(filename)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "unable to read file ", filename)

cm/manager.go

@@ -2,12 +2,14 @@ package cm
 
 import (
 	"net"
+	"strings"
 )
 
 type Manager struct {
 	active     map[net.Conn]bool
 	connect    chan net.Conn
 	disconnect chan net.Conn
+	write      chan writeOp
 }
 
 func New() *Manager {
@@ -15,6 +17,7 @@ func New() *Manager {
 		active:     make(map[net.Conn]bool, 10),
 		connect:    make(chan net.Conn),
 		disconnect: make(chan net.Conn),
+		write:      make(chan writeOp),
 	}
 	go m.run()
 	return m
@@ -27,10 +30,20 @@ func (m *Manager) run() {
 			m.active[conn] = true
 		case conn := <-m.disconnect:
 			delete(m.active, conn)
+		case op := <-m.write:
+			m.broadcast(op)
 		}
 	}
 }
 
+func (m *Manager) broadcast(op writeOp) {
+	var res writeResponse
+	for conn, _ := range m.active {
+		res.add(conn.Write(op.data))
+	}
+	op.reply <- res
+}
+
 func (m *Manager) Add(conn net.Conn) {
 	m.connect <- conn
 }
@@ -38,3 +51,51 @@ func (m *Manager) Add(conn net.Conn) {
 func (m *Manager) Remove(conn net.Conn) {
 	m.disconnect <- conn
 }
+
+func (m *Manager) Write(b []byte) (int, error) {
+	op := *newWriteOp(b)
+	m.write <- op
+	res := <-op.reply
+	return res.i, res.e
+}
+
+type multiError []error
+
+func (e multiError) add(err error) {
+	if e == nil {
+		e = make([]error, 0, 4)
+	}
+	e = append(e, err)
+}
+
+func (e multiError) Error() string {
+	messages := make([]string, len(e))
+	for i, _ := range e {
+		messages[i] = e[i].Error()
+	}
+	return strings.Join(messages, " | ")
+}
+
+type writeResponse struct {
+	i int
+	e multiError
+}
+
+func (res writeResponse) add(n int, e error) {
+	if e != nil {
+		res.e.add(e)
+	}
+	res.i += n
+}
+
+type writeOp struct {
+	data  []byte
+	reply chan writeResponse
+}
+
+func newWriteOp(b []byte) *writeOp {
+	return &writeOp{
+		data:  b,
+		reply: make(chan writeResponse),
+	}
+}

skeam.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"errors"
+	"flag"
 	"fmt"
 	"io"
 	"os"
@@ -140,22 +141,23 @@ func (s *sexp) readIn(c chan token) error {
 }
 
 // parses one value that can be evaled from the channel
-func parse(c chan token) (interface{}, error) {
+func parse(c chan token) (interface{}, bool, error) {
 	for t := range c {
 		switch t.t {
 		case closeParenToken:
-			return nil, errors.New("unexpected EOF in read")
+			return nil, false, errors.New("unexpected EOF in read")
 		case openParenToken:
 			s := newSexp()
 			if err := s.readIn(c); err != nil {
-				return nil, err
+				return nil, true, err
 			}
-			return s, nil
+			return s, false, nil
 		default:
-			return atom(t)
+			v, err := atom(t)
+			return v, false, err
 		}
 	}
-	return nil, io.EOF
+	return nil, false, io.EOF
 }
 
 func eval(v interface{}, env *environment) (interface{}, error) {
@@ -208,7 +210,7 @@ func eval(v interface{}, env *environment) (interface{}, error) {
 
 func evalall(c chan token, out chan interface{}, e chan error, env *environment) {
 	for {
-		v, err := parse(c)
+		v, _, err := parse(c)
 		switch err {
 		case io.EOF:
 			return
@@ -237,37 +239,23 @@ func defaultInterpreter(out chan interface{}, errors chan error) {
 }
 
 func main() {
+	flag.Parse()
 	if DEBUG {
 		fmt.Println(universe)
 	}
-	if len(os.Args) > 1 {
-		args()
+	if *tcpAddr != "" {
+		runTCPServer()
+		return
+	}
+	if len(flag.Args()) > 0 {
+		runfile()
 		return
 	}
 
 	out, errors := make(chan interface{}), make(chan error)
 	go defaultInterpreter(out, errors)
 
-	r := bufio.NewReader(os.Stdin)
-	for {
-		fmt.Print("> ")
-		line, prefix, err := r.ReadLine()
-		if prefix {
-			fmt.Println("(prefix)")
-		}
-		switch err {
-		case nil:
-			break
-		case io.EOF:
-			fmt.Print("\n")
-			return
-		default:
-			fmt.Println("error: ", err)
-			continue
-		}
-
 	c := make(chan token, 32)
-		go lexs(string(line)+"\n", c)
+	go lex(bufio.NewReader(os.Stdin), c)
 	evalall(c, out, errors, universe)
 }
-}

tcp_connections.go

@@ -11,19 +11,15 @@ import (
 var manager = cm.New()
 
 func tcpInterpreter(conn net.Conn, userinput chan string, out chan interface{}, errors chan error) {
-	prompt := func() {
-		io.WriteString(conn, "> ")
-	}
-	prompt()
 	for {
 		select {
 		case v := <-out:
-			fmt.Fprintln(conn, v)
-			prompt()
+			fmt.Fprintln(manager, v)
 		case err := <-errors:
 			fmt.Fprintf(conn, "error: %v", err)
 		case line := <-userinput:
 			tokens := make(chan token, 32)
+			// this is probably dumb
 			go lexs(line+"\n", tokens)
 			go evalall(tokens, out, errors, universe)
 		}