#!/usr/bin/env bash
# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# Using all the *_test.go files in the current directory, write out a file
# _testmain.go that runs all its tests. Compile everything and run the
# tests.
# If files are named on the command line, use them instead of *_test.go.

# Makes egrep,grep work better in general if we put them
# in ordinary C mode instead of what the current language is.
unset LANG
export LC_ALL=C
export LC_CTYPE=C

_GC=$GC	# Make.inc will overwrite this

if [ ! -f [Mm]akefile ]; then
	echo 'please create a Makefile for gotest; see http://golang.org/doc/code.html for details' 1>&2
	exit 2
fi

export GOROOT=${GOROOT:-"@@GOROOT@@"}
eval $(gomake -j1 --no-print-directory -f "$GOROOT"/src/Make.inc go-env)
if [ -z "$O" ]; then
	echo 'missing $O - maybe no Make.$GOARCH?' 1>&2
	exit 2
fi

E="$GORUN"

# Allow overrides
GC="${_GC:-$GC} -I _test"
GL="${GL:-$LD} -L _test"
AS="$AS"
CC="$CC"
LD="$LD"
export GC GL O AS CC LD

gofiles=""
loop=true
while $loop; do
	case "x$1" in
	x-*)
		loop=false
		;;
	x)
		loop=false
		;;
	*)
		gofiles="$gofiles $1"
		shift
		;;
	esac
done

case "x$gofiles" in
x)
	gofiles=$(echo -n $(ls *_test.go 2>/dev/null))
esac

case "x$gofiles" in
x)
	echo 'no test files found (*_test.go)' 1>&2
	exit 2
esac

# Run any commands given in sources, like
#   // gotest: $GC foo.go
# to build any test-only dependencies.
sed -n 's/^\/\/ gotest: //p' $gofiles | sh -e || exit 1

# Split $gofiles into external gofiles (those in *_test packages)
# and internal ones (those in the main package).
xgofiles=$(echo $(grep '^package[ 	]' $gofiles /dev/null | grep ':.*_test' | sed 's/:.*//'))
gofiles=$(echo $(grep '^package[ 	]' $gofiles /dev/null | grep -v ':.*_test' | sed 's/:.*//'))

# External $O file
xofile=""
havex=false
if [ "x$xgofiles" != "x" ]; then
	xofile="_xtest_.$O"
	havex=true
fi

set -e

gomake testpackage-clean
gomake testpackage "GOTESTFILES=$gofiles"
if $havex; then
	$GC -o $xofile $xgofiles
fi

# They all compile; now generate the code to call them.

# Suppress output to stdout on Linux
MAKEFLAGS=
MAKELEVEL=

# usage: nmgrep pattern file...
nmgrep() {
	pat="$1"
	shift
	for i
	do
		# Package symbol "".Foo is pkg.Foo when imported in Go.
		# Figure out pkg.
		case "$i" in
		*.a)
			pkg=$(gopack p $i __.PKGDEF | sed -n 's/^package //p' | sed 's/ .*//' | sed 1q)
			;;
		*)
			pkg=$(sed -n 's/^ .* in package "\(.*\)".*/\1/p' $i | sed 1q)
			;;
		esac
		6nm -s "$i" | egrep ' T .*\.'"$pat"'$' |
		sed 's/.* //; /\..*\./d; s/""\./'"$pkg"'./g'
	done
}

localname() {
	# The package main has been renamed to __main__ when imported.
	# Adjust its uses.
	echo $1 | sed 's/^main\./__main__./'
}

importpath=$(gomake -s importpath)
{
	# test functions are named TestFoo
	# the grep -v eliminates methods and other special names
	# that have multiple dots.
	pattern='Test([^a-z].*)?'
	tests=$(nmgrep $pattern _test/$importpath.a $xofile)
	if [ "x$tests" = x ]; then
		echo 'gotest: error: no tests matching '$pattern in _test/$importpath.a $xofile 1>&2
		exit 2
	fi
	# benchmarks are named BenchmarkFoo.
	pattern='Benchmark([^a-z].*)?'
	benchmarks=$(nmgrep $pattern _test/$importpath.a $xofile)

	# package spec
	echo 'package main'
	echo
	# imports
	if echo "$tests" | egrep -v '_test\.' >/dev/null; then
		case "$importpath" in
		testing)
			;;
		main)
			# Import path main is reserved, so import with
			# explicit reference to ./_test/main instead.
			# Also, the file we are writing defines a function named main,
			# so rename this import to __main__ to avoid name conflict.
			echo 'import __main__ "./_test/main"'
			;;
		*)
			echo 'import "'$importpath'"'
			;;
		esac
	fi
	if $havex; then
		echo 'import "./_xtest_"'
	fi
	echo 'import "testing"'
	echo 'import __regexp__ "regexp"' # rename in case tested package is called regexp
	# test array
	echo
	echo 'var tests = []testing.InternalTest{'
	for i in $tests
	do
		j=$(localname $i)
		echo '	{"'$i'", '$j'},'
	done
	echo '}'
	# benchmark array
	# The comment makes the multiline declaration
	# gofmt-safe even when there are no benchmarks.
	echo 'var benchmarks = []testing.InternalBenchmark{ //'
	for i in $benchmarks
	do
		j=$(localname $i)
		echo '	{"'$i'", '$j'},'
	done
	echo '}'
	# body
	echo
	echo 'func main() {'
	echo '	testing.Main(__regexp__.MatchString, tests)'
	echo '	testing.RunBenchmarks(__regexp__.MatchString, benchmarks)'
	echo '}'
}>_testmain.go

$GC _testmain.go
$GL _testmain.$O
$E ./$O.out "$@"