cli: make iface optional in invoice command

cli/src/command.rs

@@ -172,9 +172,9 @@ pub enum Command {
  contract_id: ContractId,
 
  /// Interface to interpret the state data
- iface: String,
+ iface: Option<String>,
 
- /// Value to transfer
+ /// Value (for fungible token) or token ID (for NFT) to transfer
  value: u64,
  },
 
@@ -357,12 +357,10 @@ impl Exec for RgbArgs {
  details,
  } => {
  let wallet = self.rgb_wallet(&config)?;
- let iface: TypeName = match iface {
- Some(iface) => tn!(iface.clone()),
- None => match contract_default_iface_name(*contract_id, wallet.stock())? {
- ControlFlow::Continue(name) => name,
- ControlFlow::Break(_) => return Ok(()),
- },
+ let iface = match contract_default_iface_name(*contract_id, wallet.stock(), iface)?
+ {
+ ControlFlow::Continue(name) => name,
+ ControlFlow::Break(_) => return Ok(()),
  };
  let mut history = wallet.history(*contract_id, iface)?;
  history.sort_by_key(|op| op.witness.map(|w| w.ord).unwrap_or(WitnessOrd::Archived));
@@ -515,12 +513,9 @@ impl Exec for RgbArgs {
  }
  }
 
- let iface: TypeName = match iface {
- Some(iface) => tn!(iface.clone()),
- None => match contract_default_iface_name(*contract_id, &stock)? {
- ControlFlow::Continue(name) => name,
- ControlFlow::Break(_) => return Ok(()),
- },
+ let iface = match contract_default_iface_name(*contract_id, &stock, iface)? {
+ ControlFlow::Continue(name) => name,
+ ControlFlow::Break(_) => return Ok(()),
  };
 
  let stock_wallet = match self.rgb_wallet_from_stock(&config, stock) {
@@ -791,7 +786,12 @@ impl Exec for RgbArgs {
  value,
  } => {
  let mut wallet = self.rgb_wallet(&config)?;
- let iface = TypeName::try_from(iface.to_owned()).expect("invalid interface name");
+
+ let iface = match contract_default_iface_name(*contract_id, wallet.stock(), iface)?
+ {
+ ControlFlow::Continue(name) => name,
+ ControlFlow::Break(_) => return Ok(()),
+ };
 
  let outpoint = wallet
  .wallet()
@@ -1143,7 +1143,11 @@ impl Exec for RgbArgs {
 fn contract_default_iface_name(
  contract_id: ContractId,
  stock: &Stock,
+ iface: &Option<String>,
 ) -> Result<ControlFlow<(), TypeName>, StockError> {
+ if let Some(iface) = iface {
+ return Ok(ControlFlow::Continue(tn!(iface.clone())));
+ };
  let info = stock.contract_info(contract_id)?;
  let schema = stock.schema(info.schema_id)?;
  Ok(match schema.iimpls.len() {