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// Copyright 2016 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package ansiterm
import (
"fmt"
"io"
)
// Writer allows colors and styles to be specified. If the io.Writer
// is not a terminal capable of color, all attempts to set colors or
// styles are no-ops.
type Writer struct {
io.Writer
noColor bool
}
// NewWriter returns a Writer that allows the caller to specify colors and
// styles. If the io.Writer is not a terminal capable of color, all attempts
// to set colors or styles are no-ops.
func NewWriter(w io.Writer) *Writer {
writer, colorCapable := colorEnabledWriter(w)
return &Writer{
Writer: writer,
noColor: !colorCapable,
}
}
// SetColorCapable forces the writer to either write the ANSI escape color
// if capable is true, or to not write them if capable is false.
func (w *Writer) SetColorCapable(capable bool) {
w.noColor = !capable
}
// SetForeground sets the foreground color.
func (w *Writer) SetForeground(c Color) {
w.writeSGR(c.foreground())
}
// SetBackground sets the background color.
func (w *Writer) SetBackground(c Color) {
w.writeSGR(c.background())
}
// SetStyle sets the text style.
func (w *Writer) SetStyle(s Style) {
w.writeSGR(s.enable())
}
// ClearStyle clears the text style.
func (w *Writer) ClearStyle(s Style) {
w.writeSGR(s.disable())
}
// Reset returns the default foreground and background colors with no styles.
func (w *Writer) Reset() {
w.writeSGR(reset)
}
type sgr interface {
// sgr returns the combined escape sequence for the Select Graphic Rendition.
sgr() string
}
// writeSGR takes the appropriate integer SGR parameters
// and writes out the ANIS escape code.
func (w *Writer) writeSGR(value sgr) {
if w.noColor {
return
}
fmt.Fprint(w, value.sgr())
}
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