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package colorprofile
import (
"bytes"
"fmt"
"image/color"
"io"
"strconv"
"github.com/charmbracelet/x/ansi"
)
// NewWriter creates a new color profile writer that downgrades color sequences
// based on the detected color profile.
//
// If environ is nil, it will use os.Environ() to get the environment variables.
//
// It queries the given writer to determine if it supports ANSI escape codes.
// If it does, along with the given environment variables, it will determine
// the appropriate color profile to use for color formatting.
//
// This respects the NO_COLOR, CLICOLOR, and CLICOLOR_FORCE environment variables.
func NewWriter(w io.Writer, environ []string) *Writer {
return &Writer{
Forward: w,
Profile: Detect(w, environ),
}
}
// Writer represents a color profile writer that writes ANSI sequences to the
// underlying writer.
type Writer struct {
Forward io.Writer
Profile Profile
}
// Write writes the given text to the underlying writer.
func (w *Writer) Write(p []byte) (int, error) {
switch w.Profile {
case TrueColor:
return w.Forward.Write(p) //nolint:wrapcheck
case NoTTY:
return io.WriteString(w.Forward, ansi.Strip(string(p))) //nolint:wrapcheck
case Ascii, ANSI, ANSI256:
return w.downsample(p)
default:
return 0, fmt.Errorf("invalid profile: %v", w.Profile)
}
}
// downsample downgrades the given text to the appropriate color profile.
func (w *Writer) downsample(p []byte) (int, error) {
var buf bytes.Buffer
var state byte
parser := ansi.GetParser()
defer ansi.PutParser(parser)
for len(p) > 0 {
parser.Reset()
seq, _, read, newState := ansi.DecodeSequence(p, state, parser)
switch {
case ansi.HasCsiPrefix(seq) && parser.Command() == 'm':
handleSgr(w, parser, &buf)
default:
// If we're not a style SGR sequence, just write the bytes.
if n, err := buf.Write(seq); err != nil {
return n, err //nolint:wrapcheck
}
}
p = p[read:]
state = newState
}
return w.Forward.Write(buf.Bytes()) //nolint:wrapcheck
}
// WriteString writes the given text to the underlying writer.
func (w *Writer) WriteString(s string) (n int, err error) {
return w.Write([]byte(s))
}
func handleSgr(w *Writer, p *ansi.Parser, buf *bytes.Buffer) {
var style ansi.Style
params := p.Params()
for i := 0; i < len(params); i++ {
param := params[i]
switch param := param.Param(0); param {
case 0:
// SGR default parameter is 0. We use an empty string to reduce the
// number of bytes written to the buffer.
style = append(style, "")
case 30, 31, 32, 33, 34, 35, 36, 37: // 8-bit foreground color
if w.Profile < ANSI {
continue
}
style = style.ForegroundColor(
w.Profile.Convert(ansi.BasicColor(param - 30))) //nolint:gosec
case 38: // 16 or 24-bit foreground color
var c color.Color
if n := ansi.ReadStyleColor(params[i:], &c); n > 0 {
i += n - 1
}
if w.Profile < ANSI {
continue
}
style = style.ForegroundColor(w.Profile.Convert(c))
case 39: // default foreground color
if w.Profile < ANSI {
continue
}
style = style.DefaultForegroundColor()
case 40, 41, 42, 43, 44, 45, 46, 47: // 8-bit background color
if w.Profile < ANSI {
continue
}
style = style.BackgroundColor(
w.Profile.Convert(ansi.BasicColor(param - 40))) //nolint:gosec
case 48: // 16 or 24-bit background color
var c color.Color
if n := ansi.ReadStyleColor(params[i:], &c); n > 0 {
i += n - 1
}
if w.Profile < ANSI {
continue
}
style = style.BackgroundColor(w.Profile.Convert(c))
case 49: // default background color
if w.Profile < ANSI {
continue
}
style = style.DefaultBackgroundColor()
case 58: // 16 or 24-bit underline color
var c color.Color
if n := ansi.ReadStyleColor(params[i:], &c); n > 0 {
i += n - 1
}
if w.Profile < ANSI {
continue
}
style = style.UnderlineColor(w.Profile.Convert(c))
case 59: // default underline color
if w.Profile < ANSI {
continue
}
style = style.DefaultUnderlineColor()
case 90, 91, 92, 93, 94, 95, 96, 97: // 8-bit bright foreground color
if w.Profile < ANSI {
continue
}
style = style.ForegroundColor(
w.Profile.Convert(ansi.BasicColor(param - 90 + 8))) //nolint:gosec
case 100, 101, 102, 103, 104, 105, 106, 107: // 8-bit bright background color
if w.Profile < ANSI {
continue
}
style = style.BackgroundColor(
w.Profile.Convert(ansi.BasicColor(param - 100 + 8))) //nolint:gosec
default:
// If this is not a color attribute, just append it to the style.
style = append(style, strconv.Itoa(param))
}
}
_, _ = buf.WriteString(style.String())
}
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