use & instead of fmt

examples/app/app.nim

@@ -239,7 +239,7 @@ proc runApp(serverHostname: string, serverPort: Port, peerId: string,
                                                 srcPort)
     asyncCheck handleServerMessages(serverConn)
     let sock = await punchHole(punchdConn, serverConn, peerId, otherPeerId,
-                               "tcp-nutss")
+                               "tcp-syni")
     echo "connected!"
     await sock.send("ping")
     let msg = await sock.recv(4)

examples/rendezvous_server/rendezvous_server.nim

@@ -136,7 +136,7 @@ proc serve(port: Port) {.async.} =
 
 proc main() =
   if paramCount() != 1:
-    echo(fmt"usage: {paramStr(0)} PORT")
+    echo(&"usage: {paramStr(0)} PORT")
     quit(1)
 
   try:

puncher.nim

@@ -54,8 +54,7 @@ method respond*(puncher: Responder, args: string):
 
 proc makeFirewallRule(srcIp: IpAddress, srcPort: Port,
                       dstIp: IpAddress, dstPort: Port): string =
-  # FIXME: use & instead of fmt?
+  result = &"""-w \
-  result = fmt"""-w \
   -d {srcIp} \
   -p icmp \
   --icmp-type time-exceeded \
@@ -69,11 +68,11 @@ proc makeFirewallRule(srcIp: IpAddress, srcPort: Port,
   -j DROP"""
 
 proc iptablesInsert(chain: string, rule: string) {.async.} =
-  let firewall_cmd = fmt"iptables -I {chain} {rule}"
+  let firewall_cmd = &"iptables -I {chain} {rule}"
   discard await asyncExecCmd(firewall_cmd)
 
 proc iptablesDelete(chain: string, rule: string) {.async.} =
-  let firewall_cmd = fmt"iptables -D {chain} {rule}"
+  let firewall_cmd = &"iptables -D {chain} {rule}"
   discard await asyncExecCmd(firewall_cmd)
 
 proc addFirewallRules*(attempt: Attempt) {.async.} =