feat: add rpc-host as first argument (#22)

README.md

@@ -51,26 +51,26 @@ Then just run it:
 
 To run it for a sovereign Cosmos-based chain, something like this should be enough:
 ```
-./tmtop --rpc-host <RPC host address>
+./tmtop <RPC host address>
 ```
 
 To run it for a sovereign chain that is not Cosmos-based (for example, Nomic), something like this should be enough
 (this will limit the app possibilities, as in, it won't display validators monikers,
 upgrades status etc.):
 ```
-./tmtop  --rpc-host <RPC host address> --chain-type tendermint
+./tmtop <RPC host address> --chain-type tendermint
 ```
 
 If a chain is not Cosmos-based, but exposes a webserver that is compatible with LCD REST API of cosmos-sdk,
 you can try running it this way to fetch data from LCD (the `--lcd-host` parameter is not used in other cases):
 ```
-./tmtop  --rpc-host <RPC host address> --chain-type cosmos-lcd --lcd-host <LCD host address>
+./tmtop <RPC host address> --chain-type cosmos-lcd --lcd-host <LCD host address>
 ```
 
 To run it for a Cosmos-based consumer chains (like Stride or Neutron),
 something like this should be enough:
 ```
-./tmtop  --rpc-host <RPC host address> --provider-rpc-host <provider RPC host> --consumer-chain-id <consumer chain ID>
+./tmtop <RPC host address> --provider-rpc-host <provider RPC host> --consumer-chain-id <consumer chain ID>
 ```
 
 There are more parameters to tweak, for all the possible arguments, see `./tmtop --help`.

cmd/tmtop.go

@@ -13,7 +13,13 @@ var (
 	version = "unknown"
 )
 
-func Execute(config configPkg.Config) {
+func Execute(config configPkg.Config, args []string) {
+	if len(args) == 0 || args[0] == "" {
+		config.RPCHost = "http://localhost:26657"
+	} else {
+		config.RPCHost = args[0]
+	}
+
 	app := pkg.NewApp(config, version)
 	app.Start()
 }
@@ -22,18 +28,18 @@ func main() {
 	var config configPkg.Config
 
 	rootCmd := &cobra.Command{
-		Use:     "tmtop",
+		Use:     "tmtop [RPC host URL]",
 		Long:    "Observe the pre-voting status of any Tendermint-based blockchain.",
 		Version: version,
 		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
 			return config.Validate()
 		},
+		Args: cobra.MaximumNArgs(1),
 		Run: func(cmd *cobra.Command, args []string) {
-			Execute(config)
+			Execute(config, args)
 		},
 	}
 
-	rootCmd.PersistentFlags().StringVar(&config.RPCHost, "rpc-host", "http://localhost:26657", "RPC host URL")
 	rootCmd.PersistentFlags().StringVar(&config.ProviderRPCHost, "provider-rpc-host", "", "Provider chain RPC host URL")
 	rootCmd.PersistentFlags().StringVar(&config.ConsumerChainID, "consumer-chain-id", "", "Consumer chain ID")
 	rootCmd.PersistentFlags().DurationVar(&config.RefreshRate, "refresh-rate", time.Second, "Refresh rate")