Split in too, added a lookup cli

Cargo.toml

@@ -11,3 +11,12 @@ serde = { version = "1.0.145", features = ["derive"] }
 serde_repr = "0.1.9"
 extindex = "0.5.0"
 rust_decimal = { version = "1.26.1", features = ["serde-str"] }
+pico-args = "0.5.0"
+
+[[bin]]
+name = "index"
+path = "src/index.rs"
+
+[[bin]]
+name = "lookup"
+path = "src/lookup.rs"

src/index.rs

@@ -82,7 +82,7 @@ struct Postcode {
 }
 
 #[derive(Serialize, Deserialize, Debug)]
-struct SmolPostcode {
+pub struct SmolPostcode {
     postcode: String,
     usertype: UserType,
     positional_quality_indicator: PositionalQuality,

src/lookup.rs

@@ -0,0 +1,16 @@
+use extindex::{Builder, Entry, SerdeWrapper, Reader as ExtReader};
+use std::path::Path;
+
+mod index;
+use crate::index::SmolPostcode;
+
+fn main() {
+    let mut pargs = pico_args::Arguments::from_env();
+    let lookup: String = pargs.free_from_str().unwrap();
+    println!("Searching for {}", &lookup);
+
+    let index_file_path = Path::new("./postcodes.db");
+    let reader = ExtReader::<String, SerdeWrapper<SmolPostcode>>::open(index_file_path).unwrap();
+    let here = reader.find(&lookup).unwrap().expect("Not found");
+    println!("Here: {:?}", here.value().0);
+}