87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package replace
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import (
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"context"
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"errors"
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"os"
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"path/filepath"
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"sort"
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"github.com/rogeecn/renamer/internal/history"
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)
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// Apply executes the planned operations and records them in the ledger.
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func Apply(ctx context.Context, req *ReplaceRequest, planned []PlannedOperation, summary Summary) (history.Entry, error) {
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entry := history.Entry{Command: "replace"}
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if len(planned) == 0 {
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return entry, nil
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}
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sort.SliceStable(planned, func(i, j int) bool {
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return planned[i].Result.Candidate.Depth > planned[j].Result.Candidate.Depth
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})
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done := make([]history.Operation, 0, len(planned))
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revert := func() error {
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for i := len(done) - 1; i >= 0; i-- {
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op := done[i]
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source := filepath.Join(req.WorkingDir, op.To)
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destination := filepath.Join(req.WorkingDir, op.From)
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if err := os.Rename(source, destination); err != nil && !errors.Is(err, os.ErrNotExist) {
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return err
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}
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}
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return nil
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}
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for _, op := range planned {
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if err := ctx.Err(); err != nil {
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_ = revert()
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return history.Entry{}, err
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}
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from := op.Result.Candidate.OriginalPath
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to := op.TargetAbsolute
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if from == to {
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continue
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}
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if err := os.Rename(from, to); err != nil {
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_ = revert()
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return history.Entry{}, err
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}
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done = append(done, history.Operation{
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From: filepath.ToSlash(op.Result.Candidate.RelativePath),
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To: filepath.ToSlash(op.TargetRelative),
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})
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}
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if len(done) == 0 {
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return entry, nil
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}
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entry.Operations = done
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metadataPatterns := make(map[string]int, len(summary.PatternMatches))
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for pattern, count := range summary.PatternMatches {
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metadataPatterns[pattern] = count
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}
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entry.Metadata = map[string]any{
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"patterns": metadataPatterns,
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"changed": summary.ChangedCount,
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"totalCandidates": summary.TotalCandidates,
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}
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if err := history.Append(req.WorkingDir, entry); err != nil {
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// Attempt to undo renames if ledger append fails.
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_ = revert()
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return history.Entry{}, err
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}
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return entry, nil
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}
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