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package common
import (
"fmt"
"os"
"os/user"
"path"
"path/filepath"
"regexp"
"runtime"
)
// Exists returns whether the given file or directory exists or not
func Exists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
if os.IsNotExist(err) {
return false
}
return true
}
// ResolveEnvVar Resolved environment variable regarding the syntax ${MYVAR}
// or $MYVAR following by a slash or a backslash
func ResolveEnvVar(s string) (string, error) {
if s == "" {
return s, nil
}
// Resolved tilde : ~/
if len(s) > 2 && s[:2] == "~/" {
if usr, err := user.Current(); err == nil {
s = filepath.Join(usr.HomeDir, s[2:])
}
}
// Resolved ${MYVAR}
re := regexp.MustCompile("\\${([^}]+)}")
vars := re.FindAllStringSubmatch(s, -1)
res := s
for _, v := range vars {
val := os.Getenv(v[1])
if val == "" {
// Specific case to resolved $HOME or ${HOME} on Windows host
if runtime.GOOS == "windows" && v[1] == "HOME" {
if usr, err := user.Current(); err == nil {
val = usr.HomeDir
}
} else {
return res, fmt.Errorf("ERROR: %s env variable not defined", v[1])
}
}
rer := regexp.MustCompile("\\${" + v[1] + "}")
res = rer.ReplaceAllString(res, val)
}
// Resolved $MYVAR following by a slash (or a backslash for Windows)
// TODO
//re := regexp.MustCompile("\\$([^\\/])+/")
return path.Clean(res), nil
}
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