+/*
+goredo -- djb's redo implementation on pure Go
+Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+ "io"
+ "os"
+ "path"
+ "path/filepath"
+ "strings"
+)
+
+func targetsWalker(root string) ([]string, error) {
+ root, err := filepath.Abs(root)
+ if err != nil {
+ panic(err)
+ }
+ dir, err := os.Open(root)
+ if err != nil {
+ return nil, err
+ }
+ defer dir.Close()
+ tgts := make([]string, 0, 1<<10)
+ for {
+ fis, err := dir.Readdir(1 << 10)
+ if err != nil {
+ if err == io.EOF {
+ break
+ }
+ return tgts, err
+ }
+ for _, fi := range fis {
+ if !fi.IsDir() {
+ continue
+ }
+ pth := path.Join(root, fi.Name())
+ if fi.Name() == RedoDir {
+ redoDir, err := os.Open(pth)
+ if err != nil {
+ return tgts, err
+ }
+ redoFis, err := redoDir.Readdir(0)
+ if err != nil {
+ return tgts, err
+ }
+ for _, redoFi := range redoFis {
+ name := redoFi.Name()
+ if strings.HasSuffix(name, DepSuffix) {
+ name = cwdMustRel(root, name)
+ tgts = append(tgts, name[:len(name)-len(DepSuffix)])
+ }
+ }
+ redoDir.Close()
+ } else {
+ subTgts, err := targetsWalker(pth)
+ tgts = append(tgts, subTgts...)
+ if err != nil {
+ return tgts, err
+ }
+ }
+ }
+ }
+ return tgts, dir.Close()
+}