mirror of https://gitea.com/gitea/tea.git
133 lines
2.5 KiB
Go
133 lines
2.5 KiB
Go
package padding
|
|
|
|
import (
|
|
"bytes"
|
|
"io"
|
|
"strings"
|
|
|
|
"github.com/mattn/go-runewidth"
|
|
|
|
"github.com/muesli/reflow/ansi"
|
|
)
|
|
|
|
type PaddingFunc func(w io.Writer)
|
|
|
|
type Writer struct {
|
|
Padding uint
|
|
PadFunc PaddingFunc
|
|
|
|
ansiWriter *ansi.Writer
|
|
buf bytes.Buffer
|
|
lineLen int
|
|
ansi bool
|
|
}
|
|
|
|
func NewWriter(width uint, paddingFunc PaddingFunc) *Writer {
|
|
w := &Writer{
|
|
Padding: width,
|
|
PadFunc: paddingFunc,
|
|
}
|
|
w.ansiWriter = &ansi.Writer{
|
|
Forward: &w.buf,
|
|
}
|
|
return w
|
|
}
|
|
|
|
func NewWriterPipe(forward io.Writer, width uint, paddingFunc PaddingFunc) *Writer {
|
|
return &Writer{
|
|
Padding: width,
|
|
PadFunc: paddingFunc,
|
|
ansiWriter: &ansi.Writer{
|
|
Forward: forward,
|
|
},
|
|
}
|
|
}
|
|
|
|
// Bytes is shorthand for declaring a new default padding-writer instance,
|
|
// used to immediately pad a byte slice.
|
|
func Bytes(b []byte, width uint) []byte {
|
|
f := NewWriter(width, nil)
|
|
_, _ = f.Write(b)
|
|
f.Close()
|
|
|
|
return f.Bytes()
|
|
}
|
|
|
|
// String is shorthand for declaring a new default padding-writer instance,
|
|
// used to immediately pad a string.
|
|
func String(s string, width uint) string {
|
|
return string(Bytes([]byte(s), width))
|
|
}
|
|
|
|
// Write is used to write content to the padding buffer.
|
|
func (w *Writer) Write(b []byte) (int, error) {
|
|
for _, c := range string(b) {
|
|
if c == '\x1B' {
|
|
// ANSI escape sequence
|
|
w.ansi = true
|
|
} else if w.ansi {
|
|
if (c >= 0x41 && c <= 0x5a) || (c >= 0x61 && c <= 0x7a) {
|
|
// ANSI sequence terminated
|
|
w.ansi = false
|
|
}
|
|
} else {
|
|
w.lineLen += runewidth.StringWidth(string(c))
|
|
|
|
if c == '\n' {
|
|
// end of current line
|
|
err := w.pad()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
w.ansiWriter.ResetAnsi()
|
|
w.lineLen = 0
|
|
}
|
|
}
|
|
|
|
_, err := w.ansiWriter.Write([]byte(string(c)))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
}
|
|
|
|
return len(b), nil
|
|
}
|
|
|
|
func (w *Writer) pad() error {
|
|
if w.Padding > 0 && uint(w.lineLen) < w.Padding {
|
|
if w.PadFunc != nil {
|
|
for i := 0; i < int(w.Padding)-w.lineLen; i++ {
|
|
w.PadFunc(w.ansiWriter)
|
|
}
|
|
} else {
|
|
_, err := w.ansiWriter.Write([]byte(strings.Repeat(" ", int(w.Padding)-w.lineLen)))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Close will finish the padding operation. Always call it before trying to
|
|
// retrieve the final result.
|
|
func (w *Writer) Close() error {
|
|
// don't pad empty trailing lines
|
|
if w.lineLen == 0 {
|
|
return nil
|
|
}
|
|
|
|
return w.pad()
|
|
}
|
|
|
|
// Bytes returns the padded result as a byte slice.
|
|
func (w *Writer) Bytes() []byte {
|
|
return w.buf.Bytes()
|
|
}
|
|
|
|
// String returns the padded result as a string.
|
|
func (w *Writer) String() string {
|
|
return w.buf.String()
|
|
}
|