#!/bin/bash

# Print a file surrounded by BEGIN/END preamble, e.g.:
#
#	--- BEGIN a.out output ---
#	Hello world
#	--- END a.out output ---
#
print_file() {
	echo "--- BEGIN ${2} ---"
	cat "${1}"
	echo "--- END ${2} ---"
}

unset -v ok tmpdir go_files go_dirs gofmt_output golint_output
ok=true
tmpdir=
trap 'case "${tmpdir}" in ?*) rm -rf "${tmpdir}";; esac' EXIT
tmpdir=$(mktemp -d)

go_files="${tmpdir}/go_files.txt"
git ls-files '*.go' | grep -v '^vendor/' > "${go_files}"

# Print dirname of each relative pathname from stdin (one per line).
dirnames() {
	# pathname	dirname
	# ----------------------
	# a/b/c.go	a/b
	# c.go		.
	sed \
		-e 's:^:./:' \
		-e 's:/[^/]*$::' \
		-e 's:^\./::'
}

go_dirs="${tmpdir}/go_dirs.txt"
dirnames < "${go_files}" | sort -u -t/ > "${go_dirs}"

echo "Running go test..."
if go test -v -count=1 ./...
then
	echo "go test succeeded."
else
	echo "go test FAILED!"
	ok=false
fi

echo "Running golint..."
golint_output="${tmpdir}/golint_output.txt"
if xargs golint -set_exit_status < "${go_dirs}" > "${golint_output}" 2>&1
then
	echo "golint passed."
else
	echo "golint FAILED!"
	print_file "${golint_output}" "golint"
	ok=false
fi

echo "Running gofmt..."
gofmt_output="${tmpdir}/gofmt_output.txt"
xargs gofmt -d -e < "${go_files}" > "${gofmt_output}" 2>&1
if [ -s "${gofmt_output}" ]
then
	echo "gofmt FAILED!"
	print_file "${gofmt_output}" "gofmt"
	ok=false
else
	echo "gofmt passed."
fi

if ! ${ok}
then
	echo "Some checks failed; see output above."
	exit 1
fi

echo "All checks passed. :-)"
exit 0