refactor: generate rust in makefile directly

Signed-off-by: Francesco Noacco <francesco.noacco@secomind.com>

Author: noaccOS

Makefile

@@ -1,14 +1,22 @@
 # Copyright 2023 SECO Mind Srl
 # SPDX-License-Identifier: Apache-2.0
 
-.PHONY=clean
+.PHONY: check all
 
-FILES=$(wildcard proto/edgehog/device/forwarder/*.proto)
-OUTPUT=rust/edgehog-device-forwarder-proto/src/proto.rs
-CODEGEN_SCRIPT=./scripts/codegen.sh
+PROTO_DIR=proto
+PROTO_FILES=$(wildcard $(PROTO_DIR)/edgehog/device/forwarder/*.proto)
+export PROTO_DIR
+export PROTO_FILES
 
-$(OUTPUT): $(FILES) $(CODEGEN_SCRIPT)
-	$(CODEGEN_SCRIPT)
+# Rust
+RUST_OUT_DIR=rust/edgehog-device-forwarder-proto/src
+RUST_OUTPUT=$(RUST_OUT_DIR)/proto.rs
 
-clean:
-	rm -vr out/
+all: check $(RUST_OUTPUT)
+
+check:
+	./scripts/check-dependencies.sh
+
+$(RUST_OUTPUT): $(PROTO_FILES)
+	cargo run --manifest-path rust/Cargo.toml -p rust-codegen -- -w proto -o $(RUST_OUT_DIR)
+	mv $(RUST_OUT_DIR)/edgehog.device.forwarder.rs $(RUST_OUTPUT)

scripts/check-dependencies.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# Copyright 2023 SECO Mind Srl
+# SPDX-License-Identifier: Apache-2.0
+
+set -exu
+
+REQUIRED_PROTOC_MAJOR="24"
+
+# check only major version of protoc
+PROTOC_MAJOR=$(command -v protoc >/dev/null &&
+    protoc --version | cut -d ' ' -f 2 | cut -d . -f 1 ||
+    true)
+
+if [ "$PROTOC_MAJOR" != "$REQUIRED_PROTOC_MAJOR" ]; then
+    echo "incompatible protoc version: found \"$PROTOC_MAJOR\", expected \"$PROTOC_MAJOR\"" >&2
+    exit 1
+fi
+
+if ! command -v protoc-gen-elixir >/dev/null
+then
+  echo 'protoc-gen-elixir not found in PATH'
+  exit 1
+fi
+
+if ! command -v escript >/dev/null
+then
+  echo 'escript not found in PATH'
+  exit 1
+fi