Makefile

# See https://tech.davis-hansson.com/p/make/
SHELL := bash
.DELETE_ON_ERROR:
.SHELLFLAGS := -eu -o pipefail -c
.DEFAULT_GOAL := all
MAKEFLAGS += --warn-undefined-variables
MAKEFLAGS += --no-builtin-rules
MAKEFLAGS += --no-print-directory
BIN := .tmp/bin
LICENSE_IGNORE := -e .tmp\/
LICENSE_HEADER_YEAR_RANGE := 2023
LICENSE_HEADER_VERSION := v1.16.0

$(BIN)/license-headers: Makefile
	mkdir -p $(@D)
	GOBIN=$(abspath $(BIN)) go install github.com/bufbuild/buf/private/pkg/licenseheader/cmd/license-header@$(LICENSE_HEADER_VERSION)

.PHONY: help
help: ## Describe useful make targets.
	grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "%-30s %s\n", $$1, $$2}'

.PHONY: licenseheaders
licenseheaders: $(BIN)/license-headers ## Format all files, adding license headers.
	comm -23 \
		<(git ls-files --cached --modified --others --no-empty-directory --exclude-standard | sort -u | grep -v $(LICENSE_IGNORE)) \
		<(git ls-files --deleted | sort -u) | \
		xargs $(BIN)/license-header \
			--license-type "apache" \
			--copyright-holder "Buf Technologies, Inc." \
			--year-range "$(LICENSE_HEADER_YEAR_RANGE)"