[server.go] Use switch statement by Accept header.

Removing methods and directly making and appending to ProcessList.

server.go

@@ -46,32 +46,31 @@ func ShutdownHTTPServer(srv *http.Server) {
 func AreProcessesUp(processes *[]string, indented bool) func(http.ResponseWriter, *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		if r.Method == http.MethodGet {
-			proclist := NewProcessList()
+			proclist := make(ProcessList)
 
 			for _, proc := range *processes {
 				pids, err := GetProcessPIDs(proc)
-				proclist.AddProcess(proc, err == nil && len(pids) > 0)
+				proclist[proc] = err == nil && len(pids) > 0
 			}
 
-			hdr := r.Header.Get("Accept")
-
-			if hdr == "application/xml" {
+			switch r.Header.Get("Accept") {
+			case "application/xml":
 				w.Header().Add("Content-Type", "application/xml")
 				enc := xml.NewEncoder(w)
 				if indented {
 					enc.Indent("", "\t")
 				}
 				enc.Encode(proclist)
-			} else if hdr == "text/plain" {
+			case "text/plain":
 				w.Header().Add("Content-Type", "text/plain")
 				var s []string
-				for k, v := range *proclist {
+				for k, v := range proclist {
 					if v {
 						s = append(s, k)
 					}
 				}
 				w.Write([]byte(strings.Join(s, ",")))
-			} else {
+			default:
 				w.Header().Add("Content-Type", "application/json")
 				enc := json.NewEncoder(w)
 				if indented {