Makes build number increment conditional

Introduces an `increment` Cargo feature to control the automatic incrementing of the build number during the build process.

This change prevents the build number from incrementing on every build, providing more control for local development and specific release scenarios. The build number will now only increment when the `increment` feature is explicitly enabled.

Adds `cargo:rerun-if-changed=src/` to ensure the build script re-runs when source files change.

src/rustylee/Cargo.toml

@@ -8,3 +8,6 @@ build = "build.rs"
 ctrlc = "3.5.2"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3.22", features = ["env-filter", "fmt"] }
+
+[features]
+increment = []

src/rustylee/build.rs

@@ -1,14 +1,17 @@
 use std::fs;
+use std::env;
 
 fn main() {
+    println!("cargo:rerun-if-changed=src/");
+
     let pkg_version = env!("CARGO_PKG_VERSION");
-    let mut content = fs::read_to_string("build_number.txt").unwrap_or("0".to_string());
+    let content = fs::read_to_string("build_number.txt").unwrap_or_else(|_| "0".to_string());
     let mut build_num: u32 = content.trim().parse().unwrap_or(0);
 
+    if env::var("CARGO_FEATURE_INCREMENT").is_ok() {
         build_num += 1;
-    let full_version = format!("{}.{}", pkg_version, build_num);
+        let _ = fs::write("build_number.txt", build_num.to_string());
+    }
 
-    fs::write("build_number.txt", build_num.to_string()).unwrap();
-
-    println!("cargo:rustc-env=FULL_VERSION={}", full_version);
+    println!("cargo:rustc-env=FULL_VERSION={}.{}", pkg_version, build_num);
 }

src/rustylee/build_number.txt

@@ -1 +1 @@
-102
+127

src/rustylee/src/brain.rs

@@ -21,6 +21,8 @@ impl Brain {
         }
     }
 
+
+
     pub fn request_shutdown(&mut self) {
         if self.state == State::Running {
             self.state = State::Stopping;