88aacc14f0
We used to send the ANSI sequence for "bright black" when we wanted gray, but this color turns out to not be visible in some popular color schemes. Instead, when we detect a 256-color terminal, switch to displaying a color sequence for gray that is consistent and does not depend on terminal color scheme.
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package utils
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import (
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"fmt"
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"io"
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"os"
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"github.com/cli/cli/pkg/iostreams"
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"github.com/mattn/go-colorable"
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"github.com/mgutz/ansi"
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)
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var (
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// Outputs ANSI color if stdout is a tty
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Magenta = makeColorFunc("magenta")
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Cyan = makeColorFunc("cyan")
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Red = makeColorFunc("red")
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Yellow = makeColorFunc("yellow")
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Blue = makeColorFunc("blue")
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Green = makeColorFunc("green")
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Gray = makeColorFunc("black+h")
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Bold = makeColorFunc("default+b")
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)
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// NewColorable returns an output stream that handles ANSI color sequences on Windows
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func NewColorable(w io.Writer) io.Writer {
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if f, isFile := w.(*os.File); isFile {
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return colorable.NewColorable(f)
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}
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return w
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}
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func makeColorFunc(color string) func(string) string {
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cf := ansi.ColorFunc(color)
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return func(arg string) string {
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if isColorEnabled() {
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if color == "black+h" && iostreams.Is256ColorSupported() {
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return fmt.Sprintf("\x1b[%d;5;%dm%s\x1b[m", 38, 242, arg)
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}
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return cf(arg)
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}
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return arg
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}
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}
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func isColorEnabled() bool {
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if iostreams.EnvColorForced() {
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return true
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}
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if iostreams.EnvColorDisabled() {
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return false
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}
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// TODO ignores cmd.OutOrStdout
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return IsTerminal(os.Stdout)
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}
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