feat(makefile): add versioning targets

Makefile

@@ -1,14 +1,18 @@
-# Makefile
+# Detect platform for sed compatibility
+SED := $(shell if [ "$(shell uname)" = "Darwin" ]; then echo gsed; else echo sed; fi)
 
-.PHONY: test cover clean
+# VERSION defines the project version, extracted from cmd/portpatrol/main.go without leading 'v'.
+VERSION := $(shell awk -F'"' '/const version/{gsub(/^v/, "", $$2); print $$2}' cmd/portpatrol/main.go)
+
+.PHONY: test cover clean update patch minor major tag
 
 # Run all unit tests
 test:
 	go test ./... -v -count=1
 
 # Generate and display test coverage
 cover:
-	sudo go test ./cmd/... ./internal/... -count=1 -coverprofile=coverage.out
+	go test ./cmd/... ./internal/... -count=1 -coverprofile=coverage.out
 	go tool cover -html=coverage.out
 
 # Clean up generated files
@@ -18,3 +22,32 @@ clean:
 # Update dependencies
 update:
 	go get -u ./...
+	go mod tidy
+
+##@ Versioning
+
+patch: ## Increment the patch version (x.y.Z -> x.y.(Z+1)).
+	@NEW_VERSION=$$(echo "$(VERSION)" | awk -F. '{print $$1"."$$2"."$$3+1}') && \
+	$(SED) -i -E "s/(const version string = \"v)[^\"]+/\1$${NEW_VERSION}/" cmd/portpatrol/main.go
+
+minor: ## Increment the minor version (x.Y.z -> x.(Y+1).0).
+	@NEW_VERSION=$$(echo "$(VERSION)" | awk -F. '{print $$1"."$$2+1".0"}') && \
+	$(SED) -i -E "s/(const version string = \"v)[^\"]+/\1$${NEW_VERSION}/" cmd/portpatrol/main.go
+
+major: ## Increment the major version (X.y.z -> (X+1).0.0).
+	@NEW_VERSION=$$(echo "$(VERSION)" | awk -F. '{print $$1+1".0.0"}') && \
+	$(SED) -i -E "s/(const version string = \"v)[^\"]+/\1$${NEW_VERSION}/" cmd/portpatrol/main.go
+
+tag: ## Tag the current commit with the current version if no tag exists and the repository is clean.
+	@if [ -n "$$(git status --porcelain)" ]; then \
+		echo "Repository has uncommitted changes. Please commit or stash them before tagging."; \
+		exit 1; \
+	fi
+	@if [ -z "$$(git tag --list v$(VERSION))" ]; then \
+		echo "Tagging version v$(VERSION)"; \
+		git tag "v$(VERSION)"; \
+		git push origin "v$(VERSION)"; \
+	else \
+		echo "Tag v$(VERSION) already exists."; \
+	fi
+

cmd/portpatrol/main.go

@@ -16,7 +16,7 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
-const version = "0.5.0"
+const version string = "0.5.0"
 
 // run is the main function of the application.
 func run(ctx context.Context, args []string, output io.Writer) error {