112 lines
2.2 KiB
Go
112 lines
2.2 KiB
Go
package indent
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import (
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"bytes"
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"io"
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"strings"
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"github.com/muesli/reflow/ansi"
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)
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type IndentFunc func(w io.Writer)
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type Writer struct {
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Indent uint
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IndentFunc IndentFunc
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ansiWriter *ansi.Writer
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buf bytes.Buffer
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skipIndent bool
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ansi bool
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}
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func NewWriter(indent uint, indentFunc IndentFunc) *Writer {
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w := &Writer{
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Indent: indent,
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IndentFunc: indentFunc,
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}
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w.ansiWriter = &ansi.Writer{
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Forward: &w.buf,
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}
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return w
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}
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func NewWriterPipe(forward io.Writer, indent uint, indentFunc IndentFunc) *Writer {
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return &Writer{
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Indent: indent,
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IndentFunc: indentFunc,
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ansiWriter: &ansi.Writer{
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Forward: forward,
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},
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}
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}
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// Bytes is shorthand for declaring a new default indent-writer instance,
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// used to immediately indent a byte slice.
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func Bytes(b []byte, indent uint) []byte {
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f := NewWriter(indent, nil)
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_, _ = f.Write(b)
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return f.Bytes()
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}
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// String is shorthand for declaring a new default indent-writer instance,
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// used to immediately indent a string.
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func String(s string, indent uint) string {
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return string(Bytes([]byte(s), indent))
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}
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// Write is used to write content to the indent buffer.
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func (w *Writer) Write(b []byte) (int, error) {
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for _, c := range string(b) {
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if c == '\x1B' {
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// ANSI escape sequence
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w.ansi = true
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} else if w.ansi {
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if (c >= 0x41 && c <= 0x5a) || (c >= 0x61 && c <= 0x7a) {
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// ANSI sequence terminated
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w.ansi = false
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}
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} else {
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if !w.skipIndent {
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w.ansiWriter.ResetAnsi()
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if w.IndentFunc != nil {
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for i := 0; i < int(w.Indent); i++ {
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w.IndentFunc(w.ansiWriter)
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}
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} else {
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_, err := w.ansiWriter.Write([]byte(strings.Repeat(" ", int(w.Indent))))
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if err != nil {
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return 0, err
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}
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}
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w.skipIndent = true
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w.ansiWriter.RestoreAnsi()
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}
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if c == '\n' {
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// end of current line
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w.skipIndent = false
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}
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}
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_, err := w.ansiWriter.Write([]byte(string(c)))
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if err != nil {
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return 0, err
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}
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}
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return len(b), nil
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}
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// Bytes returns the indented result as a byte slice.
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func (w *Writer) Bytes() []byte {
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return w.buf.Bytes()
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}
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// String returns the indented result as a string.
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func (w *Writer) String() string {
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return w.buf.String()
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}
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