package main import ( "bytes" "errors" "io" "github.com/awesome-gocui/gocui" ) type FakeFile struct { reader *bytes.Reader buffer *bytes.Buffer offset int64 view *gocui.View } func (f *FakeFile) Read(p []byte) (n int, err error) { n, err = f.reader.ReadAt(p, f.offset) f.offset += int64(n) return n, err } var fakecount int = 0 func (f *FakeFile) Write(p []byte) (n int, err error) { n, err = f.buffer.Write(p) f.offset += int64(n) f.reader.Reset(f.buffer.Bytes()) f.view.Write(p) fakecount += 1 if fakecount > 20 { fakecount = 0 f.view.Clear() } return n, err } func (f *FakeFile) Seek(offset int64, whence int) (int64, error) { newOffset := f.offset switch whence { case io.SeekStart: newOffset = offset case io.SeekCurrent: newOffset += offset case io.SeekEnd: newOffset = int64(f.buffer.Len()) + offset default: return 0, errors.New("Seek: whence not at start,current or end") } // never can get here right? if newOffset < 0 { return 0, errors.New("Seek: offset < 0") } f.offset = newOffset return f.offset, nil } func NewFakeFile(v *gocui.View) *FakeFile { buf := &bytes.Buffer{} return &FakeFile{ reader: bytes.NewReader(buf.Bytes()), buffer: buf, offset: 0, view: v, } }