feat: use clap for cli and resolve pr comments

src/bin/lib/cli.rs

@@ -0,0 +1,45 @@
+pub use clap::Parser;
+pub const DEFAULT_ROUTER_ADDRESS: &str = "0xaa820C29648D5EA543d712cC928377Bd7206a0E7";
+
+#[derive(Parser)]
+/// Encode swap transactions for the Tycho router
+///
+/// Reads a JSON object from stdin with the following structure:
+/// ```json
+/// {
+///     "sender": "0x...",
+///     "receiver": "0x...",
+///     "given_token": "0x...",
+///     "given_amount": "123...",
+///     "checked_token": "0x...",
+///     "exact_out": false,
+///     "slippage": 0.01,
+///     "expected_amount": "123...",
+///     "check_amount": "123...",
+///     "swaps": [{
+///         "component": {
+///             "id": "...",
+///             "protocol_system": "...",
+///             "protocol_type_name": "...",
+///             "chain": "ethereum",
+///             "tokens": ["0x..."],
+///             "contract_ids": ["0x..."],
+///             "static_attributes": {"key": "0x..."}
+///         },
+///         "token_in": "0x...",
+///         "token_out": "0x...",
+///         "split": 1.0
+///     }],
+///     "router_address": "0x...",
+///     "direct_execution": false
+/// }
+/// ```
+pub struct Cli {
+    /// Router contract address to use for encoding transactions
+    #[arg(default_value = DEFAULT_ROUTER_ADDRESS)]
+    pub router_address: String,
+
+    /// Private key for signing approvals (required when direct_execution is false)
+    #[arg(short, long)]
+    pub private_key: Option<String>,
+}