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package terminfo
import (
"os"
"strconv"
"strings"
)
// ColorLevel is the color level supported by a terminal.
type ColorLevel uint
// ColorLevel values.
const (
ColorLevelNone ColorLevel = iota
ColorLevelBasic
ColorLevelHundreds
ColorLevelMillions
)
// String satisfies the Stringer interface.
func (c ColorLevel) String() string {
switch c {
case ColorLevelBasic:
return "basic"
case ColorLevelHundreds:
return "hundreds"
case ColorLevelMillions:
return "millions"
}
return "none"
}
// ChromaFormatterName returns the github.com/alecthomas/chroma compatible
// formatter name for the color level.
func (c ColorLevel) ChromaFormatterName() string {
switch c {
case ColorLevelBasic:
return "terminal"
case ColorLevelHundreds:
return "terminal256"
case ColorLevelMillions:
return "terminal16m"
}
return "noop"
}
// ColorLevelFromEnv returns the color level COLORTERM, FORCE_COLOR,
// TERM_PROGRAM, or determined from the TERM environment variable.
func ColorLevelFromEnv() (ColorLevel, error) {
// check for overriding environment variables
colorTerm, termProg, forceColor := os.Getenv("COLORTERM"), os.Getenv("TERM_PROGRAM"), os.Getenv("FORCE_COLOR")
switch {
case strings.Contains(colorTerm, "truecolor") || strings.Contains(colorTerm, "24bit") || termProg == "Hyper":
return ColorLevelMillions, nil
case colorTerm != "" || forceColor != "":
return ColorLevelBasic, nil
case termProg == "Apple_Terminal":
return ColorLevelHundreds, nil
case termProg == "iTerm.app":
ver := os.Getenv("TERM_PROGRAM_VERSION")
if ver == "" {
return ColorLevelHundreds, nil
}
i, err := strconv.Atoi(strings.Split(ver, ".")[0])
if err != nil {
return ColorLevelNone, ErrInvalidTermProgramVersion
}
if i == 3 {
return ColorLevelMillions, nil
}
return ColorLevelHundreds, nil
}
// otherwise determine from TERM's max_colors capability
if term := os.Getenv("TERM"); term != "" {
ti, err := Load(term)
if err != nil {
return ColorLevelNone, err
}
v, ok := ti.Nums[MaxColors]
switch {
case !ok || v <= 16:
return ColorLevelNone, nil
case ok && v >= 256:
return ColorLevelHundreds, nil
}
}
return ColorLevelBasic, nil
}
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