ref(example_cli): Add new struct Init

for holding the items returned from `example_cli::init`

example-crates/example_bitcoind_rpc_polling/src/main.rs

@@ -110,9 +110,13 @@ enum RpcCommands {
 
 fn main() -> anyhow::Result<()> {
     let start = Instant::now();
-
-    let (args, keymap, index, db, init_changeset) =
-        example_cli::init::<RpcCommands, RpcArgs, ChangeSet>(DB_MAGIC, DB_PATH)?;
+    let example_cli::Init {
+        args,
+        keymap,
+        index,
+        db,
+        init_changeset,
+    } = example_cli::init::<RpcCommands, RpcArgs, ChangeSet>(DB_MAGIC, DB_PATH)?;
     println!(
         "[{:>10}s] loaded initial changeset from db",
         start.elapsed().as_secs_f32()

example-crates/example_cli/src/lib.rs

@@ -656,19 +656,26 @@ where
     }
 }
 
-// Alias the `Result` of `init`
-pub type InitialState<CS, S, C> = (
-    Args<CS, S>,
-    KeyMap,
-    KeychainTxOutIndex<Keychain>,
-    Mutex<Database<C>>,
-    C,
-);
+/// The initial state returned by [`init`].
+pub struct Init<CS: clap::Subcommand, S: clap::Args, C> {
+    /// Arguments parsed by the cli.
+    pub args: Args<CS, S>,
+    /// Descriptor keymap.
+    pub keymap: KeyMap,
+    /// Keychain-txout index.
+    pub index: KeychainTxOutIndex<Keychain>,
+    /// Persistence backend.
+    pub db: Mutex<Database<C>>,
+    /// Initial changeset.
+    pub init_changeset: C,
+}
 
+/// Parses command line arguments and initializes all components, creating
+/// a file store with the given parameters, or loading one if it exists.
 pub fn init<CS: clap::Subcommand, S: clap::Args, C>(
     db_magic: &[u8],
     db_default_path: &str,
-) -> anyhow::Result<InitialState<CS, S, C>>
+) -> anyhow::Result<Init<CS, S, C>>
 where
     C: Default + Append + Serialize + DeserializeOwned,
 {
@@ -702,11 +709,11 @@ where
 
     let init_changeset = db_backend.load_from_persistence()?.unwrap_or_default();
 
-    Ok((
+    Ok(Init {
         args,
         keymap,
         index,
-        Mutex::new(Database::new(db_backend)),
+        db: Mutex::new(Database::new(db_backend)),
         init_changeset,
-    ))
+    })
 }

example-crates/example_electrum/src/main.rs

@@ -103,8 +103,15 @@ type ChangeSet = (
 );
 
 fn main() -> anyhow::Result<()> {
-    let (args, keymap, index, db, (disk_local_chain, disk_tx_graph)) =
-        example_cli::init::<ElectrumCommands, ElectrumArgs, ChangeSet>(DB_MAGIC, DB_PATH)?;
+    let example_cli::Init {
+        args,
+        keymap,
+        index,
+        db,
+        init_changeset,
+    } = example_cli::init::<ElectrumCommands, ElectrumArgs, ChangeSet>(DB_MAGIC, DB_PATH)?;
+
+    let (disk_local_chain, disk_tx_graph) = init_changeset;
 
     let graph = Mutex::new({
         let mut graph = IndexedTxGraph::new(index);

example-crates/example_esplora/src/main.rs

@@ -99,8 +99,13 @@ pub struct ScanOptions {
 }
 
 fn main() -> anyhow::Result<()> {
-    let (args, keymap, index, db, init_changeset) =
-        example_cli::init::<EsploraCommands, EsploraArgs, ChangeSet>(DB_MAGIC, DB_PATH)?;
+    let example_cli::Init {
+        args,
+        keymap,
+        index,
+        db,
+        init_changeset,
+    } = example_cli::init::<EsploraCommands, EsploraArgs, ChangeSet>(DB_MAGIC, DB_PATH)?;
 
     let genesis_hash = genesis_block(args.network).block_hash();