Generating protobufs in the repo

.gitignore

@@ -12,3 +12,7 @@ Cargo.lock
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+# Nanopb protobufs aren't necessary for the project
+# its name _.rs because there's no package name in the source file
+src/generated/_.rs

Cargo.toml

@@ -16,6 +16,7 @@ doctest = false
 
 [features]
 default = ["serde"]
+gen = ["dep:prost-build", "dep:protoc-bin-vendored", "dep:walkdir"]
 
 serde = ["dep:serde", "dep:serde_json"]
 ts-gen = ["serde", "dep:specta"]
@@ -37,9 +38,9 @@ required-features = ["ts-gen"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [build-dependencies]
-prost-build = "0.11.1"
-protoc-bin-vendored = "3.0.0"
-walkdir = "2.3.2"
+prost-build = { version = "0.11.1", optional = true }
+protoc-bin-vendored = { version = "3.0.0", optional = true }
+walkdir = { version = "2.3.2", optional = true }
 
 [dependencies]
 futures-util = "0.3.28"

build.rs

@@ -1,6 +1,13 @@
-use walkdir::WalkDir;
-
 fn main() -> std::io::Result<()> {
+    #[cfg(feature = "gen")]
+    {
+        let _ = generate_protobufs();
+    }
+    Ok(())
+}
+
+#[cfg(feature = "gen")]
+fn generate_protobufs() -> std::io::Result<()> {
     let protobufs_dir = "src/protobufs/";
     println!("cargo:rerun-if-changed={}", protobufs_dir);
 
@@ -21,7 +28,7 @@ fn main() -> std::io::Result<()> {
 
     let mut protos = vec![];
 
-    for entry in WalkDir::new(protobufs_dir)
+    for entry in walkdir::WalkDir::new(protobufs_dir)
         .into_iter()
         .map(|e| e.unwrap())
         .filter(|e| {
@@ -34,6 +41,8 @@ fn main() -> std::io::Result<()> {
         protos.push(path.to_owned());
     }
 
+    protos.sort_by(|a, b| a.cmp(b));
+
     let mut config = prost_build::Config::new();
 
     let mut derive_string = String::from("#[derive(");
@@ -58,6 +67,8 @@ fn main() -> std::io::Result<()> {
         config.type_attribute(".", "#[allow(clippy::doc_lazy_continuation)]");
     }
 
+    let gen_dir = "src/generated/";
+    config.out_dir(gen_dir);
     config.compile_protos(&protos, &[protobufs_dir]).unwrap();
 
     Ok(())