package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
)

func simpleJoin(dir, path string) string {
	return dir + string(filepath.Separator) + path
}

func testEvalSymlinks(path, want string) {
	have, err := filepath.EvalSymlinks(path)
	if err != nil {
		panic(fmt.Sprintf("EvalSymlinks(%q) error: %v", path, err))
		return
	}
	if filepath.Clean(have) != filepath.Clean(want) {
		panic(fmt.Sprintf("EvalSymlinks(%q) returns %q, want %q", path, have, want))
	}
}

func main() {
	tmpDir, err := ioutil.TempDir("", "evalsymlink")
	if err != nil {
		panic(fmt.Sprintf("creating temp dir:", err))
	}
	defer os.RemoveAll(tmpDir)
	tmpDir, err = filepath.EvalSymlinks(tmpDir)
	if err != nil {
		panic(fmt.Sprintf("eval symlink for tmp dir:", err))
	}
	path := simpleJoin(tmpDir, "test")
	err = os.Mkdir(path, 0755)
	if err != nil {
		panic(err)
	}
	path = simpleJoin(tmpDir, "test/linkabs")
	err = os.Symlink("/", path)
	if err != nil {
		panic(err)
	}
	testEvalSymlinks(path, "/")
}

set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\varga\AppData\Local\go-build
set GOEXE=.exe
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOOS=windows
set GOPATH=E:\GoCode\
set GORACE=
set GOROOT=E:\go
set GOTMPDIR=
set GOTOOLDIR=E:\go\pkg\tool\windows_amd64
set GCCGO=gccgo
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\varga\AppData\Local\Temp\go-build005706398=/tmp/go-build -gno-record-gcc-switches

panic: EvalSymlinks("C:\\Users\\varga\\AppData\\Local\\Temp\\evalsymlink097815331\\test/linkabs") returns "C:\\", want "/"

goroutine 1 [running]:
main.testEvalSymlinks(0xc04209c0f0, 0x43, 0x4d7e78, 0x1)
        E:/GoCode/src/github.com/JoshVarga/evalsym/main.go:21 +0x2ce
main.main()
        E:/GoCode/src/github.com/JoshVarga/evalsym/main.go:45 +0x23a

E:\gocode\src\github.com\JoshVarga\evalsym>ECHO %TMP%
C:\Users\varga\AppData\Local\Temp