feat-add: anchor cli balance

cli/src/lib.rs

@@ -350,6 +350,16 @@ pub enum Command {
         #[clap(value_enum)]
         shell: clap_complete::Shell,
     },
+    #[clap(name = "balance", alias = "balance")]
+    /// Get your balance
+    Balance {
+        /// Account balance to check (defaults to configured wallet)
+        #[clap(index = 1, value_name = "ACCOUNT_ADDRESS")]
+        pubkey: Option<Pubkey>,
+        /// Display balance in lamports instead of SOL
+        #[clap(long)]
+        lamports: bool,
+    },
 }
 
 #[derive(Debug, Parser)]
@@ -915,6 +925,7 @@ fn process_command(opts: Opts) -> Result<()> {
             );
             Ok(())
         }
+        Command::Balance { pubkey, lamports } => balance(&opts.cfg_override, pubkey, lamports),
     }
 }
 
@@ -4417,6 +4428,53 @@ fn create_client<U: ToString>(url: U) -> RpcClient {
     RpcClient::new_with_commitment(url, CommitmentConfig::confirmed())
 }
 
+fn balance(cfg_override: &ConfigOverride, pubkey: Option<Pubkey>, lamports: bool) -> Result<()> {
+    // Get config or use defaults when outside workspace
+    let (cluster_url, wallet_path) = match Config::discover(cfg_override) {
+        Ok(Some(cfg)) => (
+            cfg.provider.cluster.url().to_string(),
+            cfg.provider.wallet.to_string(),
+        ),
+        _ => {
+            // Default to mainnet and standard Solana CLI keypair path
+            let default_cluster = "https://api.mainnet-beta.solana.com".to_string();
+            let default_keypair = dirs::home_dir()
+                .map(|home| {
+                    home.join(".config/solana/id.json")
+                        .to_string_lossy()
+                        .to_string()
+                })
+                .unwrap_or_else(|| "~/.config/solana/id.json".to_string());
+            (default_cluster, default_keypair)
+        }
+    };
+
+    // Create RPC client from cluster URL
+    let client = RpcClient::new(cluster_url);
+
+    // Determine the actual pubkey to check
+    let actual_pubkey = if let Some(pubkey) = pubkey {
+        pubkey
+    } else {
+        // Load keypair from wallet path and get pubkey
+        let keypair = Keypair::read_from_file(wallet_path)
+            .map_err(|e| anyhow!("Failed to read keypair: {}", e))?;
+        keypair.pubkey()
+    };
+
+    // Get balance
+    let balance = client.get_balance(&actual_pubkey)?;
+
+    // Format and display output
+    if lamports {
+        println!("{}", balance);
+    } else {
+        println!("{:.9} SOL", balance as f64 / 1_000_000_000.0);
+    }
+
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;