#!/bin/bash
set -euo pipefail

### Project details
name="refmt"
pkg="github.com/polydawn/$name" # everything under here will be tested
cmd="$pkg/cmd/$name"    # if you have a main.main not at the repo root, set this



### Normalize path -- all work should be relative to this script's location.
## Set up gopath -- also relative to this dir, so we work in isolation.
cd "$( dirname "${BASH_SOURCE[0]}" )"
export GOPATH="$PWD/.gopath/"
export GOBIN="$PWD/bin/"



### other config scripts?  invoke here.
## pass pointer to project root dir down, for tests (tests run in varying CWDs, so need this hint)
export PROJ="$PWD"
## use LDFLAGS to inject vars at compile time.
LDFLAGS=""



### Last bits of our flag parsery.
# subcommand arg?
SUBCOMMAND=${1:-}
# subsection arg?
SUBSECTION=${2:-"..."}
SUBSECTION="./$SUBSECTION"
# default test timeouts are far too high.  override this if you like.
TEST_TIMEOUT="${TEST_TIMEOUT:-"5s"}"



### action begins!
if [ -z "$SUBCOMMAND" ] ; then
	(
		go fmt "$SUBSECTION"
		go install -ldflags "$LDFLAGS" "$cmd" && {
			echo -e "\E[1;32minstall successful.\E[0;m\n"
		} || {
			echo -e "\E[1;41minstall failed!\E[0;m"
			exit 8
		}
		go test "$SUBSECTION" -timeout="$TEST_TIMEOUT" && {
			echo -e "\n\E[1;32mall tests green.\E[0;m"
		} || {
			echo -e "\n\E[1;41msome tests failed!\E[0;m"
			exit 4
		}
	)
else
	shift # munch $subcommand from passing on in "$@"
	case "$SUBCOMMAND" in
	-)
		# passthrough for other commands
		go "$@"
		;;
	env)
		echo "GOROOT=`go env GOROOT`"
		echo "GOPATH=`go env GOPATH`"
		;;
	path)
		echo "$GOPATH"
		;;
	init)
		# it's your responsibility to do this the first time
		# (we don't do it at the front of every build because it will move submodules if you already have them, and that might not be what you want as you're plowing along)
		git submodule update --init
		# also make sure the self-symlink exists.  should be committed anyway (but then, this is also useful for project-first-steps.)
		mkdir -p "$(dirname ".gopath/src/$pkg")"
		ln -snf "$(echo "${pkg//[^\/]}/" | sed s#/#../#g)"../ ".gopath/src/$pkg"
		;;
	test)
		set +e ; shift ; set -e # munch $subsection from passing on in "$@"
		go test -i "$SUBSECTION" "$@" &&
		go test -v "$SUBSECTION" -timeout="$TEST_TIMEOUT" "$@" && {
			echo -e "\n\E[1;32mall tests green.\E[0;m"
		} || {
			echo -e "\n\E[1;41msome tests failed!\E[0;m"
			exit 4
		}
		;;
	install)
		go install -ldflags "$LDFLAGS" "$cmd"
		;;
	bench)
		profPath="$GOPATH/tmp/prof/"
		mkdir -p "$profPath"
		set +e ; shift ; set -e # munch $subsection from passing on in "$@"
		go test -i "$SUBSECTION" "$@" &&
		GOCONVEY_REPORTER=silent \
		go test \
			-run=XXX -bench=. \
			-o "$profPath/bench.bin" \
			-cpuprofile="$profPath/cpu.pprof" \
			"$SUBSECTION" "$@"  || {
				echo -e "\E[1;41msome benchmarks failed!\E[0;m"
				exit 4
		}
		# use e.g.: go tool pprof --text .gopath/tmp/prof/bench.bin .gopath/tmp/prof/cpu.pprof
		;;
	fmt)
		go fmt "$SUBSECTION"
		;;
	doc)
		set +e ; shift ; set -e # munch $subsection from passing on in "$@"
		for package in $(go list "$SUBSECTION" | sed "s#^_${PWD}#${pkg}#"); do
			echo -e "==== $package ====\n"
			godoc "$@" "$package"
			echo -e "\n\n\n"
		done
		;;
	cover)
		coverFile="$GOPATH/tmp/cover/cover.out"
		mkdir -p "$(dirname "$coverFile")"
		for package in $(go list "$SUBSECTION" | sed "s#^_${PWD}#${pkg}#"); do
			rm -f "$coverFile"
			echo "==== $package ===="
			go test -coverprofile="$coverFile" "$package" && \
			[ -f "$coverFile" ] && \
			echo ---- && \
			go tool cover -func="$coverFile" && \
			echo ---- && \
			go tool cover -html="$coverFile"
			echo ====
			echo
		done
		rm -f "$coverFile"
		;;
	clean)
		rm -rf "$GOBIN" "$GOPATH/pkg" "$GOPATH/tmp"
		;;
	*)
		echo "Usage: $0 {init|test|install|bench|fmt|doc|cover|clean}" 1>&2;
		exit 1
	;;
	esac
fi