goext/termext/termcolor.go

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2022-10-27 16:48:26 +02:00
package termext
import (
"golang.org/x/term"
"os"
"regexp"
"strconv"
"strings"
)
// -> partly copied from [ https://github.com/jwalton/go-supportscolor/tree/master ]
func SupportsColors() bool {
if isatty := term.IsTerminal(int(os.Stdout.Fd())); !isatty {
return false
}
termenv := os.Getenv("TERM")
if termenv == "dumb" {
return false
}
if osColorEnabled := enableColor(); !osColorEnabled {
return false
}
if _, ci := os.LookupEnv("CI"); ci {
var ciEnvNames = []string{"TRAVIS", "CIRCLECI", "APPVEYOR", "GITLAB_CI", "GITHUB_ACTIONS", "BUILDKITE", "DRONE"}
for _, ciEnvName := range ciEnvNames {
_, exists := os.LookupEnv(ciEnvName)
if exists {
return true
}
}
if os.Getenv("CI_NAME") == "codeship" {
return true
}
return false
}
if teamCityVersion, isTeamCity := os.LookupEnv("TEAMCITY_VERSION"); isTeamCity {
versionRegex := regexp.MustCompile(`^(9\.(0*[1-9]\d*)\.|\d{2,}\.)`)
if versionRegex.MatchString(teamCityVersion) {
return true
}
return false
}
if os.Getenv("COLORTERM") == "truecolor" {
return true
}
if termProgram, termProgramPreset := os.LookupEnv("TERM_PROGRAM"); termProgramPreset {
switch termProgram {
case "iTerm.app":
termProgramVersion := strings.Split(os.Getenv("TERM_PROGRAM_VERSION"), ".")
version, err := strconv.ParseInt(termProgramVersion[0], 10, 64)
if err == nil && version >= 3 {
return true
}
return true
case "Apple_Terminal":
return true
default:
// No default
}
}
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var term256Regex = regexp.MustCompile(`(?i)-256(color)?$`)
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if term256Regex.MatchString(termenv) {
return true
}
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var termBasicRegex = regexp.MustCompile(`(?i)^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux`)
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if termBasicRegex.MatchString(termenv) {
return true
}
if _, colorTerm := os.LookupEnv("COLORTERM"); colorTerm {
return true
}
return false
}