Add a basic cli binary

Cargo.toml

@@ -4,13 +4,18 @@ version = "0.0.1"
 edition = "2021"
 repository = "https://github.com/lndk-org/lndk"
 
+[[bin]]
+name = "lndk-cli"
+path = "src/cli.rs"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [package.metadata.configure_me]
 spec = "config_spec.toml"
 
 [dependencies]
 async-trait = "0.1.66"
 bitcoin = { version = "0.29.2", features = ["rand"] }
+clap = { version = "4.4.6", features = ["derive"] }
 futures = "0.3.26"
 home = "0.5.5"
 lightning = "0.0.118"

README.md

@@ -66,11 +66,11 @@ In order for `LNDK` successfully connect to `LND`, we need to pass in the grpc a
 
 1) These values can be passed in via the command line when running the `LNDK` program, like this:
 
-`cargo run -- --address=<ADDRESS> --cert=<TLSPATH> --macaroon=<MACAROONPATH>`
+`cargo run --bin=lndk -- --address=<ADDRESS> --cert=<TLSPATH> --macaroon=<MACAROONPATH>`
 
 Or in a more concrete example:
 
-`cargo run -- --address=https://localhost:10009 --cert=/home/<USERNAME>/.lnd/tls.cert --macaroon=/home/<USERNAME>/.lnd/data/chain/bitcoin/regtest/admin.macaroon`
+`cargo run --bin=lndk -- --address=https://localhost:10009 --cert=/home/<USERNAME>/.lnd/tls.cert --macaroon=/home/<USERNAME>/.lnd/data/chain/bitcoin/regtest/admin.macaroon`
 
 **Remember** that the grpc address must start with https:// for the program to work.
 
@@ -81,7 +81,7 @@ Or in a more concrete example:
   * `address="<ADDRESS"`
   * `cert="<TLSPATH>"`
   * `macaroon="<MACAROONPATH>"`
-* Run `cargo run -- --conf lndk.conf`
+* Run `cargo run --bin=lndk -- --conf lndk.conf`
 
 - Use any of the commands with the --help option for more information about each argument.
 

src/cli.rs

@@ -0,0 +1,39 @@
+use clap::{Parser, Subcommand};
+use lndk::lndk_offers::decode;
+
+/// A cli for interacting with lndk.
+#[derive(Debug, Parser)]
+#[command(name = "lndk-cli")]
+#[command(about = "A cli for interacting with lndk", long_about = None)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Debug, Subcommand)]
+enum Commands {
+    /// Decodes a bech32-encoded offer string into a BOLT 12 offer.
+    Decode {
+        /// The offer string to decode.
+        offer_string: String,
+    },
+}
+
+fn main() {
+    let args = Cli::parse();
+    match args.command {
+        Commands::Decode { offer_string } => {
+            println!("Decoding offer: {offer_string}.");
+            match decode(offer_string) {
+                Ok(offer) => println!("Decoded offer: {:?}.", offer),
+                Err(e) => {
+                    println!(
+                        "ERROR please provide offer starting with lno. Provided offer is \
+                        invalid, failed to decode with error: {:?}.",
+                        e
+                    )
+                }
+            }
+        }
+    }
+}

src/lib.rs

@@ -1,5 +1,7 @@
 mod clock;
 pub mod lnd;
+#[allow(dead_code)]
+pub mod lndk_offers;
 mod onion_messenger;
 mod rate_limit;
 

src/lndk_offers.rs

@@ -0,0 +1,7 @@
+use lightning::offers::offer::Offer;
+use lightning::offers::parse::Bolt12ParseError;
+
+// Decodes a bech32 string into an LDK offer.
+pub fn decode(offer_str: String) -> Result<Offer, Bolt12ParseError> {
+    offer_str.parse::<Offer>()
+}