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package pathutil
import (
"os"
"path/filepath"
"strings"
"golang.org/x/sys/windows"
)
// Exists returns true if the specified path exists.
func Exists(path string) bool {
fi, err := os.Lstat(path)
if fi != nil && fi.Mode()&os.ModeSymlink != 0 {
_, err = filepath.EvalSymlinks(path)
}
return err == nil || os.IsExist(err)
}
// ExpandHome substitutes `%USERPROFILE%` at the start of the specified
// `path` using the provided `home` location.
func ExpandHome(path, home string) string {
if path == "" || home == "" {
return path
}
if strings.HasPrefix(path, `%USERPROFILE%`) {
return filepath.Join(home, path[13:])
}
return path
}
// KnownFolder returns the location of the folder with the specified ID.
// If that fails, the folder location is determined by reading the provided
// environment variables (the first non-empty read value is returned).
// If that fails as well, the first non-empty fallback is returned.
// If all of the above fails, the function returns an empty string.
func KnownFolder(id *windows.KNOWNFOLDERID, envVars []string, fallbacks []string) string {
if id != nil {
flags := []uint32{windows.KF_FLAG_DEFAULT, windows.KF_FLAG_DEFAULT_PATH}
for _, flag := range flags {
p, _ := windows.KnownFolderPath(id, flag|windows.KF_FLAG_DONT_VERIFY)
if p != "" {
return p
}
}
}
for _, envVar := range envVars {
p := os.Getenv(envVar)
if p != "" {
return p
}
}
for _, fallback := range fallbacks {
if fallback != "" {
return fallback
}
}
return ""
}
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