goroutine for command stdout capture

serverwrapper.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"io"
 	"log"
-
+	"time"
 	//	"math"
 	"container/ring"
 	"os/exec"
@@ -24,30 +24,36 @@ func reload() {
 }
 
 //builds the cmd which is called to run the server
-func build_cmd() (string, string) {
-	return "ping", "-t 8.8.8.8"
+func build_cmd() (string, []string) {
+	return "ping", []string{"-t", "8.8.8.8"}
 }
 
 //run the server-thread
 func server_run() {
-	//create the command and start it
+	//create the command
 	cmd_str, cmd_args := build_cmd()
-	cmd := exec.Command(cmd_str, cmd_args)
-	err := cmd.Start()
-	if err != nil {
-		log.Panicln("Failed to call server command \"" + cmd.String() + "\"")
-	}
+	cmd := exec.Command(cmd_str, cmd_args...)
 
 	//connect pipes
 	stdout, err := cmd.StdoutPipe()
 	cmd.Stderr = cmd.Stdout
 	srv_stdin, err = cmd.StdinPipe() //this one is global, because we write to it elsewhere
 
+	// run the process
+	err = cmd.Start()
+	if err != nil {
+		log.Panicln("Failed to call server command \"" + cmd.String() + "\"")
+	}
+
 	//read pipes and write them to the ring buffer
-	buf := bufio.NewReader(stdout)
+	buf := bufio.NewScanner(stdout)
 	for {
-		stdout_ring.Value, _, err = buf.ReadLine()
-		stdout_ring = stdout_ring.Next()
+		if buf.Scan() {
+			stdout_ring.Value = buf.Text()
+			stdout_ring = stdout_ring.Next()
+		} else {
+			time.Sleep(300 * time.Millisecond)
+		}
 	}
 
 }
@@ -60,12 +66,17 @@ func refresh(g *gocui.Gui) error {
 	}
 	v.Clear()
 
-	vW, vH := v.Size()
+	_, vH := v.Size()
 
 	r := stdout_ring
 
+	v.Overwrite = true
+
 	for i := 0; i < vH; i++ {
-		fmt.Fprintln(v, r.Value)
+		v.SetCursor(4, vH - i)
+		if r.Value != nil {
+			fmt.Fprint(v, r.Value)
+		}
 		r = r.Prev()
 	}
 
@@ -92,6 +103,9 @@ func main() {
 		log.Panicln(err)
 	}
 
+	go server_run()
+
+	//run the CUI main loop
 	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
 		log.Panicln(err)
 	}
@@ -101,15 +115,14 @@ func main() {
 func layout(g *gocui.Gui) error {
 	maxX, maxY := g.Size()
 
-	if v, err := g.SetView("srv_log", 0, 0, maxX-1, int(float32(maxY) * 0.8)); err != nil {
+	if _, err := g.SetView("srv_log", 0, 0, maxX-1, int(float32(maxY) * 0.8)); err != nil {
 		if err != gocui.ErrUnknownView {
 			return err
 		}
-
-		str, _ := settings.ToTomlString();
-		fmt.Fprintln(v, str)
 	}
 
+	refresh(g)
+
 	return nil
 }