Function GetPathComponentsRelativeTo

internal/tspath/path.go:729–771

Relative Paths

(from string, to string, options ComparePathsOptions)

//// Relative Paths

func GetPathComponentsRelativeTo(from string, to string, options ComparePathsOptions) []string {
	fromComponents := reducePathComponents(GetPathComponents(from, options.CurrentDirectory))
	toComponents := reducePathComponents(GetPathComponents(to, options.CurrentDirectory))

	start := 0
	maxCommonComponents := min(len(fromComponents), len(toComponents))
	stringEqualer := options.getEqualityComparer()
	for ; start < maxCommonComponents; start++ {
		fromComponent := fromComponents[start]
		toComponent := toComponents[start]
		if start == 0 {
			if !stringutil.EquateStringCaseInsensitive(fromComponent, toComponent) {
				break
			}
		} else {
			if !stringEqualer(fromComponent, toComponent) {
				break
			}
		}
	}

	if start == 0 {
		return toComponents
	}

	numDotDotSlashes := len(fromComponents) - start
	result := make([]string, 1+numDotDotSlashes+len(toComponents)-start)

	result[0] = ""
	i := 1
	// Add all the relative components until we hit a common directory.
	for range numDotDotSlashes {
		result[i] = ".."
		i++
	}
	// Now add all the remaining components of the "to" path.
	for _, component := range toComponents[start:] {
		result[i] = component
		i++
	}

	return result
}

func GetRelativePathFromDirectory(fromDirectory string, to string, options ComparePathsOptions) string {
	if (GetRootLength(fromDirectory) > 0) != (GetRootLength(to) > 0) {