migrate to melange + opam

Author: jchavarri

.gitignore

@@ -9,3 +9,5 @@ yarn-error.log*
 *.bs.js
 
 _esy
+_build
+_opam

Makefile

@@ -0,0 +1,59 @@
+project_name = melange-atdgen-codec-runtime
+
+DUNE = opam exec -- dune
+
+.DEFAULT_GOAL := help
+
+.PHONY: help
+help: ## Print this help message
+	@echo "List of available make commands";
+	@echo "";
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2}';
+	@echo "";
+
+.PHONY: create-switch
+create-switch: ## Create opam switch
+	opam switch create . 4.14.1 -y --deps-only
+
+.PHONY: init
+init: create-switch install ## Configure everything to develop this repository in local
+
+.PHONY: install
+install: ## Install development dependencies
+	yarn
+	opam update
+	# Needed for melange-jest, only for development
+	opam pin add melange-webapi.dev -y git+https://github.com/melange-community/melange-webapi.git#17a6998985253bca49602fc29ec8735f899458ae
+	opam pin -y add $(project_name).dev . --working-dir
+
+.PHONY: build
+build: ## Build the project
+	$(DUNE) build @melange
+
+.PHONY: build_verbose
+build_verbose: ## Build the project
+	$(DUNE) build --verbose @melange
+
+.PHONY: clean
+clean: ## Clean build artifacts and other generated files
+	$(DUNE) clean
+
+.PHONY: format
+format: ## Format the codebase with ocamlformat
+	$(DUNE) build @fmt --auto-promote
+
+.PHONY: format-check
+format-check: ## Checks if format is correct
+	$(DUNE) build @fmt
+
+.PHONY: watch
+watch: ## Watch for the filesystem and rebuild on every change
+	$(DUNE) build --watch @melange
+
+.PHONY: test
+test: ## Run the tests
+	$(DUNE) build @runtest --no-buffer
+
+.PHONY: test-watch
+test-watch: ## Run the tests and watch for changes
+	$(DUNE) build -w @runtest