Fix lint errors, add nogui linker flag

cmd/builder/build.go

@@ -1,9 +1,10 @@
 package main
 
 import (
- "github.com/spf13/cobra"
  "runtime"
 
+ "github.com/spf13/cobra"
+
  . "myst/pkg/builder/util"
 )
 
@@ -49,7 +50,7 @@ var buildCmd = &cobra.Command{
 
  Step("Building client", func() {
  if runtime.GOOS == "windows" {
- Run("go build -o build/client/client-$GOOS-$GOARCH.exe cmd/client/main.go")
+ Run("go build -ldflags \"-H=windowsgui\" -o build/client/client-$GOOS-$GOARCH.exe cmd/client/main.go")
  } else {
  Run("go build -o build/client/client-$GOOS-$GOARCH cmd/client/main.go")
  }

cmd/client/main.go

@@ -5,6 +5,7 @@ import (
  "fmt"
  "os"
  "os/signal"
+ "syscall"
 
  "fyne.io/systray"
  "github.com/namsral/flag"
@@ -54,7 +55,7 @@ func main() {
  }
 
  interrupt := make(chan os.Signal, 1)
- signal.Notify(interrupt, os.Interrupt, os.Kill)
+ signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)
 
  done := make(chan bool, 1)
 
@@ -90,7 +91,6 @@ func onReady() {
  go func() {
  <-quit.ClickedCh
  systray.Quit()
- return
  }()
 }