new example. generate public key

Author: PFC-developer

examples/pubkey.rs

@@ -0,0 +1,40 @@
+use dotenv::dotenv;
+use secp256k1::Secp256k1;
+
+use terra_rust_cli::cli_helpers;
+
+async fn run() -> anyhow::Result<()> {
+    let cli = cli_helpers::gen_cli("pubkey", "pubkey");
+    let matches = cli.get_matches();
+    let secp = Secp256k1::new();
+    let private_key = cli_helpers::get_private_key(&secp, &matches)?;
+
+    let msg = "mary had a little lamb. I ate, coz lamb is delicious";
+    // let signature = from_key.sign(&secp, &cli.message)?;
+    let signature = private_key.sign(&secp, &msg)?;
+
+    println!("PubKeySig={}", signature.pub_key.value);
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() {
+    dotenv().ok();
+    env_logger::init();
+
+    if let Err(ref err) = run().await {
+        log::error!("{}", err);
+        err.chain()
+            .skip(1)
+            .for_each(|cause| log::error!("because: {}", cause));
+
+        // The backtrace is not always generated. Try to run this example
+        // with `$env:RUST_BACKTRACE=1`.
+        //    if let Some(backtrace) = e.backtrace() {
+        //        log::debug!("backtrace: {:?}", backtrace);
+        //    }
+
+        ::std::process::exit(1);
+    }
+}