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package filepath
import (
"fmt"
"strings"
)
// IsAncestor returns true when pathB is an strict ancestor of pathA,
// and false where the paths are equal or pathB is outside of pathA.
// Paths that are not absolute will be made absolute with Abs.
func IsAncestor(os, pathA, pathB, cwd string) (_ bool, err error) {
if pathA == pathB {
return false, nil
}
pathA, err = Abs(os, pathA, cwd)
if err != nil {
return false, err
}
pathB, err = Abs(os, pathB, cwd)
if err != nil {
return false, err
}
sep := Separator(os)
if !strings.HasSuffix(pathA, string(sep)) {
pathA = fmt.Sprintf("%s%c", pathA, sep)
}
if pathA == pathB {
return false, nil
}
return strings.HasPrefix(pathB, pathA), nil
}
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