Function NewBuffer

internal/buffer/buffer.go:357–500

NewBuffer creates a new buffer from a given reader with a given path Ensure that ReadSettings and InitGlobalSettings have been called before creating a new buffer Places the cursor at startcursor. If startcursor is -1, -1 places the cursor at an autodetected location (based on savecursor or :LINE:CO

(r io.Reader, size int64, path string, btype BufType, cmd Command)

// Places the cursor at startcursor. If startcursor is -1, -1 places the
// cursor at an autodetected location (based on savecursor or :LINE:COL)
func NewBuffer(r io.Reader, size int64, path string, btype BufType, cmd Command) *Buffer {
	absPath, err := filepath.Abs(path)
	if err != nil {
		absPath = path
	}

	b := new(Buffer)

	found := false
	if len(path) > 0 {
		for _, buf := range OpenBuffers {
			if buf.AbsPath == absPath && buf.Type != BTInfo {
				found = true
				b.SharedBuffer = buf.SharedBuffer
				b.EventHandler = buf.EventHandler
			}
		}
	}

	hasBackup := false
	if !found {
		b.SharedBuffer = new(SharedBuffer)
		b.Type = btype

		b.AbsPath = absPath
		b.Path = path

		b.Settings = config.DefaultCommonSettings()
		b.LocalSettings = make(map[string]bool)
		for k, v := range config.GlobalSettings {
			if _, ok := config.DefaultGlobalOnlySettings[k]; !ok {
				// make sure setting is not global-only
				b.Settings[k] = v
			}
		}
		config.UpdatePathGlobLocals(b.Settings, absPath)

		b.encoding, err = htmlindex.Get(b.Settings["encoding"].(string))
		if err != nil {
			b.encoding = unicode.UTF8
			b.Settings["encoding"] = "utf-8"
		}

		var ok bool
		hasBackup, ok = b.ApplyBackup(size)

		if !ok {
			return NewBufferFromString("", "", btype)
		}
		if !hasBackup {
			reader := bufio.NewReader(transform.NewReader(r, b.encoding.NewDecoder()))

			var ff FileFormat = FFAuto

			if size == 0 {
				// for empty files, use the fileformat setting instead of
				// autodetection
				switch b.Settings["fileformat"] {