Update README with the CLI approach

README.md

@@ -1,7 +1,48 @@
-# Transit For London GTFS Exporter
+# Transport For London GTFS Exporter
 
-This simple rust program pulls data from the TFL Unified API
-and converts it to a directory with GTFS files in it.
+This simple Rust CLI allows you to fetch data from the
+[Tfl Unified API][tfl-api] and transform it to [GTFS][gtfs].
 
-Clone and "cargo run --release" to generate a gtfs directory with all the 
-required .txt csv files.
+
+## Install
+
+Clone [the repository][tfl-cli] and compile:
+
+```sh
+cargo build --release
+```
+
+*WARNING*: If you compile under OSX 10.11 you might need to specify the
+OpenSSL include path.  For example, having OpenSSL installed via Homebrew,
+the command is:
+
+```sh
+OPENSSL_INCLUDE_DIR=/usr/local/opt/openssl/include cargo build --release
+```
+
+You will find the binary in `./target/release/`.
+
+## Usage
+
+Check the help `./target/release/tflgtfs help` for details.
+
+In short, you can fetch Tfl lines with the `fetch-lines` command and transform
+the cached values with the `transform gtfs` command.
+
+You can do it in one shot via:
+
+```sh
+./target/release/tflgtfs fetch-lines --format gtfs
+```
+
+You will find the resulting GTFS files inside `./gtfs`.
+
+
+## License
+
+See [License](./LICENSE).
+
+
+[tfl-cli]: https://github.com/CommuteStream/tflgtfs/
+[tfl-api]: https://api.tfl.gov.uk/
+[gtfs]: https://developers.google.com/transit/gtfs/

src/cmd.rs

@@ -83,7 +83,7 @@ fn transform_gtfs(lines: Vec<Line>) {
         line_count += 1;
         line_ids.insert(line.id.clone());
     }
-    println!("Duplicate Lines: {}, Duplicate Route Sections: {}", line_count-line_ids.len(), route_section_count-route_section_ids.len());
+    println!("Duplicate Lines: {}, Duplicate Route Sections: {}", line_count - line_ids.len(), route_section_count-route_section_ids.len());
 
     println!("Schedule Names:");
     for schedule_name in &schedule_names {