// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cmd

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

var srcPaths []string

func init() {
	// Initialize srcPaths.
	envGoPath := os.Getenv("GOPATH")
	goPaths := filepath.SplitList(envGoPath)
	if len(goPaths) == 0 {
		// Adapted from https://github.com/Masterminds/glide/pull/798/files.
		// As of Go 1.8 the GOPATH is no longer required to be set. Instead there
		// is a default value. If there is no GOPATH check for the default value.
		// Note, checking the GOPATH first to avoid invoking the go toolchain if
		// possible.

		goExecutable := os.Getenv("COBRA_GO_EXECUTABLE")
		if len(goExecutable) <= 0 {
			goExecutable = "go"
		}

		out, err := exec.Command(goExecutable, "env", "GOPATH").Output()
		if err != nil {
			er(err)
		}

		toolchainGoPath := strings.TrimSpace(string(out))
		goPaths = filepath.SplitList(toolchainGoPath)
		if len(goPaths) == 0 {
			er("$GOPATH is not set")
		}
	}
	srcPaths = make([]string, 0, len(goPaths))
	for _, goPath := range goPaths {
		srcPaths = append(srcPaths, filepath.Join(goPath, "src"))
	}
}

func er(msg interface{}) {
	if msg != nil {
		fmt.Println("Error:", msg)
		os.Exit(1)
	}
}