Rename file and fs wrappers (#39)

* Rename file and fs wrappers

* Add missing test

file_callbacks.go

@@ -0,0 +1,148 @@
+package aferomock
+
+import (
+	"io/fs"
+
+	"github.com/spf13/afero"
+)
+
+var _ fs.File = (*FileCallbacks)(nil)
+
+// FileCallbacks is a callback-based mock for afero.File.
+type FileCallbacks struct {
+	CloseFunc        func() error
+	NameFunc         func() string
+	ReadFunc         func(p []byte) (int, error)
+	ReadAtFunc       func(p []byte, off int64) (int, error)
+	ReaddirFunc      func(count int) ([]fs.FileInfo, error)
+	ReaddirnamesFunc func(n int) ([]string, error)
+	SeekFunc         func(offset int64, whence int) (int64, error)
+	StatFunc         func() (fs.FileInfo, error)
+	SyncFunc         func() error
+	TruncateFunc     func(size int64) error
+	WriteFunc        func(p []byte) (int, error)
+	WriteAtFunc      func(p []byte, off int64) (int, error)
+	WriteStringFunc  func(s string) (int, error)
+}
+
+// Close satisfies the afero.File interface.
+func (f *FileCallbacks) Close() error {
+	return f.CloseFunc()
+}
+
+// Name satisfies the afero.File interface.
+func (f *FileCallbacks) Name() string {
+	return f.NameFunc()
+}
+
+// Read satisfies the afero.File interface.
+func (f *FileCallbacks) Read(p []byte) (int, error) {
+	return f.ReadFunc(p)
+}
+
+// ReadAt satisfies the afero.File interface.
+func (f *FileCallbacks) ReadAt(p []byte, off int64) (int, error) {
+	return f.ReadAtFunc(p, off)
+}
+
+// Readdir satisfies the afero.File interface.
+func (f *FileCallbacks) Readdir(count int) ([]fs.FileInfo, error) {
+	return f.ReaddirFunc(count)
+}
+
+// Readdirnames satisfies the afero.File interface.
+func (f *FileCallbacks) Readdirnames(n int) ([]string, error) {
+	return f.ReaddirnamesFunc(n)
+}
+
+// Seek satisfies the afero.File interface.
+func (f *FileCallbacks) Seek(offset int64, whence int) (int64, error) {
+	return f.SeekFunc(offset, whence)
+}
+
+// Stat satisfies the afero.File interface.
+func (f *FileCallbacks) Stat() (fs.FileInfo, error) {
+	return f.StatFunc()
+}
+
+// Sync satisfies the afero.File interface.
+func (f *FileCallbacks) Sync() error {
+	return f.SyncFunc()
+}
+
+// Truncate satisfies the afero.File interface.
+func (f *FileCallbacks) Truncate(size int64) error {
+	return f.TruncateFunc(size)
+}
+
+// Write satisfies the afero.File interface.
+func (f *FileCallbacks) Write(p []byte) (int, error) {
+	return f.WriteFunc(p)
+}
+
+// WriteAt satisfies the afero.File interface.
+func (f *FileCallbacks) WriteAt(p []byte, off int64) (int, error) {
+	return f.WriteAtFunc(p, off)
+}
+
+// WriteString satisfies the afero.File interface.
+func (f *FileCallbacks) WriteString(s string) (int, error) {
+	return f.WriteStringFunc(s)
+}
+
+// OverrideFile overrides the file methods with the given callbacks.
+func OverrideFile(file afero.File, callbacks FileCallbacks) *FileCallbacks { //nolint: cyclop,dupl
+	if callbacks.CloseFunc == nil {
+		callbacks.CloseFunc = file.Close
+	}
+
+	if callbacks.NameFunc == nil {
+		callbacks.NameFunc = file.Name
+	}
+
+	if callbacks.ReadFunc == nil {
+		callbacks.ReadFunc = file.Read
+	}
+
+	if callbacks.ReadAtFunc == nil {
+		callbacks.ReadAtFunc = file.ReadAt
+	}
+
+	if callbacks.ReaddirFunc == nil {
+		callbacks.ReaddirFunc = file.Readdir
+	}
+
+	if callbacks.ReaddirnamesFunc == nil {
+		callbacks.ReaddirnamesFunc = file.Readdirnames
+	}
+
+	if callbacks.SeekFunc == nil {
+		callbacks.SeekFunc = file.Seek
+	}
+
+	if callbacks.StatFunc == nil {
+		callbacks.StatFunc = file.Stat
+	}
+
+	if callbacks.SyncFunc == nil {
+		callbacks.SyncFunc = file.Sync
+	}
+
+	if callbacks.TruncateFunc == nil {
+		callbacks.TruncateFunc = file.Truncate
+	}
+
+	if callbacks.WriteFunc == nil {
+		callbacks.WriteFunc = file.Write
+	}
+
+	if callbacks.WriteAtFunc == nil {
+		callbacks.WriteAtFunc = file.WriteAt
+	}
+
+	if callbacks.WriteStringFunc == nil {
+		callbacks.WriteStringFunc = file.WriteString
+	}
+
+	return &callbacks
+}