programkind: quietly skip non-file files (#529)

* programkind: quietly skip non-file files

* add error handling

pkg/programkind/programkind.go

@@ -7,6 +7,7 @@ import (
  "errors"
  "fmt"
  "io"
+ "io/fs"
  "os"
  "path/filepath"
  "strings"
@@ -93,6 +94,18 @@ func makeFileType(path string, ext string, mime string) *FileType {
 
 // File detects what kind of program this file might be.
 func File(path string) (*FileType, error) {
+ st, err := os.Stat(path)
+ if err != nil {
+ return nil, fmt.Errorf("stat: %w", err)
+ }
+
+ if st.IsDir() {
+ return nil, nil
+ }
+ if st.Mode().Type() == fs.ModeIrregular {
+ return nil, nil
+ }
+
  // first strategy: mimetype
  mtype, err := mimetype.DetectFile(path)
  if err == nil {