make clap and optional dependency (#69)

Cargo.toml

@@ -15,7 +15,7 @@ version = "0.4.0"
 [dependencies]
 anyhow = "1"
 bytes = "1"
-clap = {version = "4.2.5", features = ["color", "help", "usage", "derive"]}
+clap = {version = "4.2.5", features = ["color", "help", "usage", "derive"], optional = true}
 lazy_static = "1.4.0"
 prost = "0.11"
 rand = "0.8.5"
@@ -32,6 +32,14 @@ cities-json = "0.3.6"
 [dev-dependencies]
 criterion = {version = "0.4", features = ["html_reports"]}
 
+[features]
+default = ["clap"]
+
+[[bin]]
+name = "tzf"
+required-features = ["clap"]
+doc = false
+
 [[bench]]
 harness = false
 name = "finders"

README.md

@@ -6,6 +6,20 @@
 - Geometry: use <https://github.com/ringsaturn/geometry-rs> which is
   <https://github.com/tidwall/geometry>'s Rust port.
 
+## Build options
+
+By default, the binary is built as well. If you don't want/need it, then build like this:
+
+```bash
+> cargo build --no-default-features
+```
+
+Or put in your `Cargo.toml` file:
+
+```toml
+tzf-rs = { version = "0.4.0", default-features = false }
+```
+
 ## Bindings
 
 - Ruby, see [tzf-rb](https://github.com/HarlemSquirrel/tzf-rb)

src/bin/tzf.rs

@@ -1,3 +1,5 @@
+#![cfg(feature = "clap")]
+
 use clap::Parser;
 use tzf_rs::DefaultFinder;