command_parser, main: implement ShowCommand::Ipv4

Fixes Gitea issue #30

src/command_parser.rs

@@ -100,6 +100,7 @@ pub enum ShowCommand {
     Pid,
     SteinhartHart,
     PostFilter,
+    Ipv4,
 }
 
 #[derive(Debug, Clone, PartialEq)]
@@ -494,6 +495,8 @@ fn ipv4_addr(input: &[u8]) -> IResult<&[u8], Result<[u8; 4], Error>> {
 
 fn ipv4(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
     let (input, _) = tag("ipv4")(input)?;
+    alt((
+        |input| {
             let (input, _) = whitespace(input)?;
             let (input, address) = ipv4_addr(input)?;
             let (input, _) = tag("/")(input)?;
@@ -515,6 +518,9 @@ fn ipv4(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
                 }))
             };
             Ok((input, result()))
+        },
+        value(Ok(Command::Show(ShowCommand::Ipv4)), end),
+    ))(input)
 }
 
 fn command(input: &[u8]) -> IResult<&[u8], Result<Command, Error>> {
@@ -579,6 +585,12 @@ mod test {
         assert_eq!(command, Ok(Command::Save { channel: Some(0) }));
     }
 
+    #[test]
+    fn parse_show_ipv4() {
+        let command = Command::parse(b"ipv4");
+        assert_eq!(command, Ok(Command::Show(ShowCommand::Ipv4)));
+    }
+
     #[test]
     fn parse_ipv4() {
         let command = Command::parse(b"ipv4 192.168.1.26/24");

src/main.rs

@@ -183,7 +183,7 @@ fn main() -> ! {
     let hwaddr = EthernetAddress(eui48);
     info!("EEPROM MAC address: {}", hwaddr);
 
-    net::run(clocks, dp.ETHERNET_MAC, dp.ETHERNET_DMA, eth_pins, hwaddr, ipv4_config, |iface| {
+    net::run(clocks, dp.ETHERNET_MAC, dp.ETHERNET_DMA, eth_pins, hwaddr, ipv4_config.clone(), |iface| {
         Server::<Session>::run(iface, |server| {
             leds.r1.off();
 
@@ -280,6 +280,12 @@ fn main() -> ! {
                                         }
                                     }
                                 }
+                                Command::Show(ShowCommand::Ipv4) => {
+                                    let (cidr, gateway) = net::split_ipv4_config(ipv4_config.clone());
+                                    let _ = write!(socket, "{{\"addr\":\"{}\"", cidr);
+                                    gateway.map(|gateway| write!(socket, ",\"gateway\":\"{}\"", gateway));
+                                    let _ = writeln!(socket, "}}");
+                                }
                                 Command::PwmPid { channel } => {
                                     channels.channel_state(channel).pid_engaged = true;
                                     leds.g3.on();