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filepath.go
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filepath.go
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package bkl
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
)
// FileMatch attempts to find a file with the same base name as path, but
// possibly with a different supported extension. It is intended to support
// "virtual" filenames that auto-convert from the format of the underlying
// real file.
//
// Returns the real filename and the requested output format, or
// ("", "", error).
func FileMatch(path string) (string, string, error) {
f := ext(path)
if _, found := formatByExtension[f]; !found {
return "", "", fmt.Errorf("%s: %w", f, ErrInvalidType)
}
withoutExt := strings.TrimSuffix(path, "."+f)
if filepath.Base(withoutExt) == "-" {
return path, f, nil
}
realPath := findFile(withoutExt)
if realPath == "" {
return "", "", fmt.Errorf("%s.*: %w", withoutExt, ErrMissingFile)
}
return realPath, f, nil
}
func ext(path string) string {
return strings.TrimPrefix(filepath.Ext(path), ".")
}
func findFile(path string) string {
for ext := range formatByExtension {
extPath := fmt.Sprintf("%s.%s", path, ext)
if _, err := os.Stat(extPath); errors.Is(err, os.ErrNotExist) {
continue
}
return extPath
}
return ""
}
func globFiles(path string) ([]string, error) {
pat := fmt.Sprintf("%s.*", path)
patDots := strings.Count(pat, ".")
matches, err := filepath.Glob(pat)
if err != nil {
return nil, err
}
ret := []string{}
for _, match := range matches {
if strings.Count(match, ".") != patDots {
// Wildcard matched a "."
continue
}
if _, found := formatByExtension[ext(match)]; !found {
// Unsupported extension
continue
}
ret = append(ret, match)
}
return ret, nil
}