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package termenv
import (
"errors"
"os"
"github.com/mattn/go-isatty"
)
var (
// ErrStatusReport gets returned when the terminal can't be queried.
ErrStatusReport = errors.New("unable to retrieve status report")
)
const (
// Escape character.
ESC = '\x1b'
// Bell.
BEL = '\a'
// Control Sequence Introducer.
CSI = string(ESC) + "["
// Operating System Command.
OSC = string(ESC) + "]"
// String Terminator.
ST = string(ESC) + `\`
)
func (o *Output) isTTY() bool {
if o.assumeTTY || o.unsafe {
return true
}
if len(o.environ.Getenv("CI")) > 0 {
return false
}
if f, ok := o.Writer().(*os.File); ok {
return isatty.IsTerminal(f.Fd())
}
return false
}
// ColorProfile returns the supported color profile:
// Ascii, ANSI, ANSI256, or TrueColor.
func ColorProfile() Profile {
return output.ColorProfile()
}
// ForegroundColor returns the terminal's default foreground color.
func ForegroundColor() Color {
return output.ForegroundColor()
}
// BackgroundColor returns the terminal's default background color.
func BackgroundColor() Color {
return output.BackgroundColor()
}
// HasDarkBackground returns whether terminal uses a dark-ish background.
func HasDarkBackground() bool {
return output.HasDarkBackground()
}
// EnvNoColor returns true if the environment variables explicitly disable color output
// by setting NO_COLOR (https://no-color.org/)
// or CLICOLOR/CLICOLOR_FORCE (https://bixense.com/clicolors/)
// If NO_COLOR is set, this will return true, ignoring CLICOLOR/CLICOLOR_FORCE
// If CLICOLOR=="0", it will be true only if CLICOLOR_FORCE is also "0" or is unset.
func (o *Output) EnvNoColor() bool {
return o.environ.Getenv("NO_COLOR") != "" || (o.environ.Getenv("CLICOLOR") == "0" && !o.cliColorForced())
}
// EnvNoColor returns true if the environment variables explicitly disable color output
// by setting NO_COLOR (https://no-color.org/)
// or CLICOLOR/CLICOLOR_FORCE (https://bixense.com/clicolors/)
// If NO_COLOR is set, this will return true, ignoring CLICOLOR/CLICOLOR_FORCE
// If CLICOLOR=="0", it will be true only if CLICOLOR_FORCE is also "0" or is unset.
func EnvNoColor() bool {
return output.EnvNoColor()
}
// EnvColorProfile returns the color profile based on environment variables set
// Supports NO_COLOR (https://no-color.org/)
// and CLICOLOR/CLICOLOR_FORCE (https://bixense.com/clicolors/)
// If none of these environment variables are set, this behaves the same as ColorProfile()
// It will return the Ascii color profile if EnvNoColor() returns true
// If the terminal does not support any colors, but CLICOLOR_FORCE is set and not "0"
// then the ANSI color profile will be returned.
func EnvColorProfile() Profile {
return output.EnvColorProfile()
}
// EnvColorProfile returns the color profile based on environment variables set
// Supports NO_COLOR (https://no-color.org/)
// and CLICOLOR/CLICOLOR_FORCE (https://bixense.com/clicolors/)
// If none of these environment variables are set, this behaves the same as ColorProfile()
// It will return the Ascii color profile if EnvNoColor() returns true
// If the terminal does not support any colors, but CLICOLOR_FORCE is set and not "0"
// then the ANSI color profile will be returned.
func (o *Output) EnvColorProfile() Profile {
if o.EnvNoColor() {
return Ascii
}
p := o.ColorProfile()
if o.cliColorForced() && p == Ascii {
return ANSI
}
return p
}
func (o *Output) cliColorForced() bool {
if forced := o.environ.Getenv("CLICOLOR_FORCE"); forced != "" {
return forced != "0"
}
return false
}
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