Add --color flag to force colored output on/off

pkg/commands/executor.go

@@ -1,6 +1,7 @@
 package commands
 
 import (
+	"github.com/fatih/color"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 
@@ -53,6 +54,17 @@ func NewExecutor(version, commit, date string) *Executor {
 		logutils.SetupVerboseLog(e.log, commandLineCfg.Run.IsVerbose)
 	}
 
+	switch commandLineCfg.Output.Color {
+	case "always":
+		color.NoColor = false
+	case "never":
+		color.NoColor = true
+	case "auto":
+		// nothing
+	default:
+		e.log.Fatalf("invalid value %q for --color; must be 'always', 'auto', or 'never'", commandLineCfg.Output.Color)
+	}
+
 	// init of commands must be done before config file reading because
 	// init sets config with the default values of flags
 	e.initRoot()

pkg/commands/root.go

@@ -103,4 +103,6 @@ func initRootFlagSet(fs *pflag.FlagSet, cfg *config.Config, needVersionOption bo
 	if needVersionOption {
 		fs.BoolVar(&cfg.Run.PrintVersion, "version", false, wh("Print version"))
 	}
+
+	fs.StringVar(&cfg.Output.Color, "color", "auto", wh("Use color when printing; can be 'always', 'auto', or 'never'"))
 }

pkg/config/config.go

@@ -295,6 +295,7 @@ type Config struct { //nolint:maligned
 
 	Output struct {
 		Format              string
+		Color               string
 		PrintIssuedLine     bool `mapstructure:"print-issued-lines"`
 		PrintLinterName     bool `mapstructure:"print-linter-name"`
 		PrintWelcomeMessage bool `mapstructure:"print-welcome"`