support explicit paths and processing paths from stdin #21
83
internal/cache/walk.go
vendored
83
internal/cache/walk.go
vendored
@ -1,83 +0,0 @@
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package cache
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"os/exec"
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"path/filepath"
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"github.com/charmbracelet/log"
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"golang.org/x/sync/errgroup"
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)
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const (
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GitWalker = "git"
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FilesystemWalker = "filesystem"
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)
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func walk(ctx context.Context, root string, walker string, fn filepath.WalkFunc) error {
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l := log.WithPrefix("walk")
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if walker == GitWalker {
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// check if we're dealing with a git repository
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cmd := exec.Command("git", "-C", root, "rev-parse", "--is-inside-work-tree")
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_, err := cmd.CombinedOutput()
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if err != nil {
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l.Info("git repo check failed, falling back to filesystem", "err", err)
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walker = "filesystem"
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}
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}
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l.Infof("walking %s with %s", root, walker)
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switch walker {
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case GitWalker:
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return walkGit(ctx, root, fn)
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case FilesystemWalker:
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return filepath.Walk(root, fn)
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default:
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return fmt.Errorf("unknown walker: %s", walker)
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}
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}
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func walkGit(ctx context.Context, root string, fn filepath.WalkFunc) error {
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r, w := io.Pipe()
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cmd := exec.Command("git", "-C", root, "ls-files")
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cmd.Stdout = w
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cmd.Stderr = w
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eg := errgroup.Group{}
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eg.Go(func() error {
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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line := scanner.Text()
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path := filepath.Join(root, line)
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// stat the file
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info, err := os.Lstat(path)
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if err = fn(path, info, err); err != nil {
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return err
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}
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}
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}
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return nil
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})
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if err := w.CloseWithError(cmd.Run()); err != nil {
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return err
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}
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return eg.Wait()
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}
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