Add shims/net for forced IP address initialization

stew/shims/net.nim

@@ -0,0 +1,33 @@
+import std/net as stdNet
+export stdNet
+
+type
+  ValidIpAddress* = distinct IpAddress
+
+{.push raises: [Defect].}
+
+proc ipv4*(address: array[4, byte]): ValidIpAddress =
+  ValidIpAddress IpAddress(family: IPv4, address_v4: address)
+
+template ipv4*(a, b, c, d: byte): ValidIpAddress =
+  ipv4([a, b, c, d])
+
+proc ipv6*(address: array[16, byte]): ValidIpAddress =
+  ValidIpAddress IpAddress(family: IPv6, address_v6: address)
+
+template family*(a: ValidIpAddress): IpAddressFamily =
+  IpAddress(a).family
+
+template address_v4*(a: ValidIpAddress): array[4, byte] =
+  IpAddress(a).address_v4
+
+template address_v6*(a: ValidIpAddress): array[16, byte] =
+  IpAddress(a).address_v6
+
+template `$`*(a: ValidIpAddress): string =
+  $ IpAddress(a)
+
+func init*(T: type ValidIpAddress, str: string): T
+          {.raises: [ValueError].} =
+  ValidIpAddress stdNet.parseIpAddress(str)
+