## Standard Makefile preamble
## according to https://tech.davis-hansson.com/p/make/

## Specify a shell
SHELL := bash

## set shell options
.SHELLFLAGS := -eu -o pipefail -c

## Makefile defaults
.ONESHELL:
.DELETE_ON_ERROR:

MAKEFLAGS += --warn-undefined-variables
MAKEFLAGS += --no-builtin-rules

## Modify Makefile parsing
ifeq ($(origin .RECIPEPREFIX), undefined)
  $(error This Make does not support .RECIPEPREFIX. Please use GNU Make 4.0 or later)
endif
.RECIPEPREFIX = >

#----------------------------------------------------------------
# Variables
#----------------------------------------------------------------
progName = scaffold
arch = amd64
winbinName = $(progName).exe
releaseTag = $(shell git describe --abbrev=0)

#----------------------------------------------------------------
# Helpers
#----------------------------------------------------------------

## help: print this help message

help:
> @echo 'Usage:'
> @sed -n 's/^##//p' ${MAKEFILE_LIST} | column -t -s ':' | sed -e 's/^/ /'

## confirm: a helper script to check your intent
confirm:
> @echo -n 'Are you sure? [y/N] ' && read ans && [ $${ans:-N} = y ]

## clean: clears temp files
clean:
> @echo 'Cleaning temp files ...'
> @echo '' > buildTime.txt
> @echo '' > buildVersion.txt
> @echo 'Done cleaning.'

#----------------------------------------------------------------
# Build
#----------------------------------------------------------------

# build strips debugging info from binary
linkerflags = '-s -w'

prep: clean
> date +"%F %a %T %Z" > buildTime.txt
> git describe --always --tags --dirty --long > buildVersion.txt
> @mkdir -p build

build: prep linux windows

linux:
> @GOOS=$@ GOARCH=$(arch) go build -o build/$@/$(progName) . && echo $@ "Build success" || echo $@ "[FAILED] go build"

windows:
> @GOOS=$@ GOARCH=$(arch) go build -o build/$@/$(progName)-$(arch)-$(releaseTag).exe . && echo $@ "Build success" || echo $@ "[FAILED] go build"

build-production: prep linx-production

linux-production:
> @GOOS=linx GOARCH=$(arch) go build -ldflags=${linkerflags} -o build/$@/$(progName) . && echo "production build success" || echo "[FAILED] production build"

#-------------------------------------------------------------
# Install - same as build, but places binary on system path
#-------------------------------------------------------------

install: prep
> @go install . && echo "Build and Install success" || echo "[FAILED] go install"

install-production: prep
> @go install -ldflags=${linkerflags} . && echo "Production build and install success" || echo "[FAILED] Production install"

## Commands that don't relate to a specific file
.PHONY: help confirm clean prep build build-production linux windows amd64