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