mirror of https://github.com/harness/drone.git
144 lines
3.8 KiB
Go
144 lines
3.8 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package paths
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import (
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"errors"
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"strings"
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"github.com/harness/gitness/types"
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"github.com/gotidy/ptr"
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)
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var (
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ErrPathEmpty = errors.New("path is empty")
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)
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// DisectLeaf splits a path into its parent path and the leaf name
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// e.g. space1/space2/space3 -> (space1/space2, space3, nil).
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func DisectLeaf(path string) (string, string, error) {
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path = strings.Trim(path, types.PathSeparatorAsString)
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if path == "" {
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return "", "", ErrPathEmpty
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}
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i := strings.LastIndex(path, types.PathSeparatorAsString)
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if i == -1 {
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return "", path, nil
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}
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return path[:i], path[i+1:], nil
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}
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// DisectRoot splits a path into its root space and sub-path
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// e.g. space1/space2/space3 -> (space1, space2/space3, nil).
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func DisectRoot(path string) (string, string, error) {
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path = strings.Trim(path, types.PathSeparatorAsString)
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if path == "" {
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return "", "", ErrPathEmpty
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}
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i := strings.Index(path, types.PathSeparatorAsString)
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if i == -1 {
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return path, "", nil
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}
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return path[:i], path[i+1:], nil
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}
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/*
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* Concatenate two paths together (takes care of leading / trailing '/')
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* e.g. (space1/, /space2/) -> space1/space2
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*
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* NOTE: All leading, trailing, and consecutive '/' will be trimmed to ensure correct paths.
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*/
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func Concatenate(paths ...string) string {
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if len(paths) == 0 {
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return ""
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}
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sb := strings.Builder{}
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for i := 0; i < len(paths); i++ {
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// remove all leading, trailing, and consecutive '/'
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var nextRune *rune
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for _, r := range paths[i] {
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// skip '/' if we already have '/' as next rune or we don't have anything other than '/' yet
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if (nextRune == nil || *nextRune == types.PathSeparator) && r == types.PathSeparator {
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continue
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}
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// first time we take a rune we have to make sure we add a separator if needed (guaranteed no '/').
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if nextRune == nil && sb.Len() > 0 {
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sb.WriteString(types.PathSeparatorAsString)
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}
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// flush the previous rune before storing the next rune
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if nextRune != nil {
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sb.WriteRune(*nextRune)
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}
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nextRune = ptr.Of(r)
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}
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// flush the final rune
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if nextRune != nil && *nextRune != types.PathSeparator {
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sb.WriteRune(*nextRune)
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}
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}
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return sb.String()
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}
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// Segments returns all segments of the path
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// e.g. space1/space2/space3 -> [space1, space2, space3].
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func Segments(path string) []string {
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path = strings.Trim(path, types.PathSeparatorAsString)
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return strings.Split(path, types.PathSeparatorAsString)
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}
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// Depth returns the depth of the path.
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// e.g. space1/space2 -> 2.
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func Depth(path string) int {
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path = strings.Trim(path, types.PathSeparatorAsString)
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if len(path) == 0 {
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return 0
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}
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return strings.Count(path, types.PathSeparatorAsString) + 1
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}
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// IsAncesterOf returns true iff 'path' is an ancestor of 'other' or they are the same.
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// e.g. other = path(/.*).
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func IsAncesterOf(path string, other string) bool {
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path = strings.Trim(path, types.PathSeparatorAsString)
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other = strings.Trim(other, types.PathSeparatorAsString)
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// add "/" to both to handle space1/inner and space1/in
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return strings.Contains(
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other+types.PathSeparatorAsString,
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path+types.PathSeparatorAsString,
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)
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}
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// Parent returns the parent path of the provided path.
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// if the path doesn't have a parent an empty string is returned.
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func Parent(path string) string {
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spacePath, _, _ := DisectLeaf(path)
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return spacePath
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}
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