Add --no-color flag (#449)

README.md

@@ -167,13 +167,13 @@ For more information on kubernetes config files, see https://kubernetes.io/docs/
 
 Kubeaudit produces results with three levels of severity:
 
-`Error`: A security issue or invalid kubernetes configuration
-`Warning`: A best practice recommendation
-`Info`: Informational, no action required. This includes results that are [overridden](#override-errors)
+- `Error`: A security issue or invalid kubernetes configuration
+- `Warning`: A best practice recommendation
+- `Info`: Informational, no action required. This includes results that are [overridden](#override-errors)
 
 The minimum severity level can be set using the `--minSeverity/-m` flag.
 
-By default kubeaudit will output results in a human-readable way. If the output is intended to be further processed, it can be set to output JSON using the `--format json` flag. To output results as logs (the previous default) use `--format logrus`.
+By default kubeaudit will output results in a human-readable way. If the output is intended to be further processed, it can be set to output JSON using the `--format json` flag. To output results as logs (the previous default) use `--format logrus`. Some output formats include colors to make results easier to read in a terminal. To disable colors (for example, if you are sending output to a text file), you can use the `--no-color` flag.
 
 If there are results of severity level `error`, kubeaudit will exit with exit code 2. This can be changed using the `--exitcode/-e` flag.
 
@@ -220,6 +220,7 @@ Auditors can also be run individually.
 | -g    | --includegenerated | Include generated resources in scan  (such as Pods generated by deployments). If you would like kubeaudit to produce results for generated resources (for example if you have custom resources or want to catch orphaned resources where the owner resource no longer exists) you can use this flag. |
 | -m    | --minseverity      | Set the lowest severity level to report (one of "error", "warning", "info") (default "info")                                                           |
 | -e    | --exitcode         | Exit code to use if there are results with severity of "error". Conventionally, 0 is used for success and all non-zero codes for an error. (default 2) |
+|       | --no-color         | Don't use colors in the output (the default is true) |
 
 ## Configuration File
 

cmd/commands/root.go

@@ -25,6 +25,7 @@ type rootFlags struct {
 	minSeverity      string
 	exitCode         int
 	includeGenerated bool
+	noColor          bool
 }
 
 // RootCmd defines the shell command usage for kubeaudit.
@@ -54,6 +55,7 @@ func init() {
 	RootCmd.PersistentFlags().StringVarP(&rootConfig.format, "format", "p", "pretty", "The output format to use (one of \"pretty\", \"logrus\", \"json\")")
 	RootCmd.PersistentFlags().StringVarP(&rootConfig.namespace, "namespace", "n", apiv1.NamespaceAll, "Only audit resources in the specified namespace. Not currently supported in manifest mode.")
 	RootCmd.PersistentFlags().BoolVarP(&rootConfig.includeGenerated, "includegenerated", "g", false, "Include generated resources in scan  (eg. pods generated by deployments).")
+	RootCmd.PersistentFlags().BoolVar(&rootConfig.noColor, "no-color", false, "Don't produce colored output.")
 	RootCmd.PersistentFlags().StringVarP(&rootConfig.manifest, "manifest", "f", "", "Path to the yaml configuration to audit. Only used in manifest mode.")
 	RootCmd.PersistentFlags().IntVarP(&rootConfig.exitCode, "exitcode", "e", 2, "Exit code to use if there are results with severity of \"error\". Conventionally, 0 is used for success and all non-zero codes for an error.")
 }
@@ -72,6 +74,7 @@ func runAudit(auditable ...kubeaudit.Auditable) func(cmd *cobra.Command, args []
 
 		printOptions := []kubeaudit.PrintOption{
 			kubeaudit.WithMinSeverity(KubeauditLogLevels[strings.ToLower(rootConfig.minSeverity)]),
+			kubeaudit.WithColor(!rootConfig.noColor),
 		}
 
 		switch rootConfig.format {