build (Makefile): move binary check logic to parent function

Simplifies function calls to check_bin

Author: pythoninthegrass

Makefile

@@ -0,0 +1,128 @@
+#!/usr/bin/make -f
+
+.DEFAULT_GOAL := help
+
+.ONESHELL:
+
+# ENV VARS
+export SHELL := $(shell which sh)
+export UNAME := $(shell uname -s)
+export ASDF_VERSION := v0.13.1
+
+# check commands and OS
+ifeq ($(UNAME), Darwin)
+	export XCODE := $(shell xcode-select -p 2>/dev/null)
+	export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK := 1
+else ifeq ($(UNAME), Linux)
+	include /etc/os-release
+endif
+
+# colors
+GREEN := $(shell tput -Txterm setaf 2)
+YELLOW := $(shell tput -Txterm setaf 3)
+WHITE := $(shell tput -Txterm setaf 7)
+CYAN := $(shell tput -Txterm setaf 6)
+RESET := $(shell tput -Txterm sgr0)
+
+# Usage: $(call check_bin,command_name)
+define check_bin
+	$(shell \
+		if command -v $(1) >/dev/null 2>&1; then \
+			echo "false"; \
+		else \
+			echo "true"; \
+		fi \
+	)
+endef
+
+# Usage: $(call brew_install,package_name)
+# For packages where binary name differs from package name, add a mapping in the case statement
+define brew_install
+	@if [ "${UNAME}" = "Darwin" ] || [ "${UNAME}" = "Linux" ]; then \
+		binary_name=""; \
+		case "$(1)" in \
+			"go-task") binary_name="task" ;; \
+			*) binary_name="$(1)" ;; \
+		esac; \
+		if $(call check_bin,$$binary_name); then \
+			echo "Installing $(1)..."; \
+			brew install $(1); \
+		else \
+			echo "$(1) already installed."; \
+		fi \
+	else \
+		echo "$(1) not supported."; \
+	fi
+endef
+
+# targets
+.PHONY: all
+all: help asdf xcode brew jq pre-commit sccache task ## run all targets
+
+xcode: ## install xcode command line tools
+ifeq ($(UNAME), Darwin)
+	@if [ -z "${XCODE}" ]; then \
+		echo "Installing Xcode command line tools..."; \
+		xcode-select --install; \
+	else \
+		echo "xcode already installed."; \
+	fi
+else
+	@echo "xcode not supported."
+endif
+
+brew: xcode ## install homebrew
+ifeq ($(UNAME), Darwin)
+	@if $(call check_bin,brew); then \
+		echo "Installing Homebrew..."; \
+		/bin/bash -c "$$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"; \
+	else \
+		echo "brew already installed."; \
+	fi
+else ifeq ($(UNAME), Linux)
+	@if $(call check_bin,brew) && [ "${ID_LIKE}" = "debian" ]; then \
+		echo "Installing Homebrew..."; \
+		/bin/bash -c "$$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"; \
+	else \
+		echo "brew already installed."; \
+	fi
+else
+	@echo "brew not supported."
+endif
+
+asdf: xcode ## install asdf
+	@if $(call check_bin,asdf); then \
+		echo "Installing asdf..."; \
+		git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch ${ASDF_VERSION}; \
+		echo "To use asdf, add the following to your shell rc (.bashrc/.zshrc):"; \
+		echo "export PATH=\"$$HOME/.asdf/shims:$$PATH\""; \
+		echo ". $$HOME/.asdf/asdf.sh"; \
+		echo ". $$HOME/.asdf/completions/asdf.bash"; \
+	else \
+		echo "asdf already installed."; \
+	fi
+
+jq: brew ## install jq
+	$(call brew_install,jq)
+
+pre-commit: brew ## install pre-commit
+	$(call brew_install,pre-commit)
+
+sccache: brew ## install sccache
+	$(call brew_install,sccache)
+
+task: brew ## install taskfile
+	$(call brew_install,go-task)
+
+install: xcode asdf brew jq pre-commit sccache task ## install dependencies
+
+help: ## show this help
+	@echo ''
+	@echo 'Usage:'
+	@echo '    ${YELLOW}make${RESET} ${GREEN}<target>${RESET}'
+	@echo ''
+	@echo 'Targets:'
+	@awk 'BEGIN {FS = ":.*?## "} { \
+		if (/^[a-zA-Z_-]+:.*?##.*$$/) {printf "    ${YELLOW}%-20s${GREEN}%s${RESET}\n", $$1, $$2} \
+		else if (/^## .*$$/) {printf "  ${CYAN}%s${RESET}\n", substr($$1,4)} \
+		}' $(MAKEFILE_LIST)