fix color auto detection

If nothing is set OR if there's an error reading the color value, the
CLI should autodetect based off of the TTY.

[Finishes #156326872]

Signed-off-by: Tom Viehman <tviehman@pivotal.io>

util/configv3/color.go

@@ -24,7 +24,7 @@ type ColorSetting int
 // ColorEnabled returns the color setting based off:
 //   1. The $CF_COLOR environment variable if set (0/1/t/f/true/false)
 //   2. The 'ColorEnabled' value in the .cf/config.json if set
-//   3. Defaults to ColorEnabled if nothing is set
+//   3. Defaults to ColorAuto if nothing is set
 func (config *Config) ColorEnabled() ColorSetting {
 	if config.ENV.CFColor != "" {
 		val, err := strconv.ParseBool(config.ENV.CFColor)
@@ -35,7 +35,7 @@ func (config *Config) ColorEnabled() ColorSetting {
 
 	val, err := strconv.ParseBool(config.ConfigFile.ColorEnabled)
 	if err != nil {
-		return ColorEnabled
+		return ColorAuto
 	}
 	return config.boolToColorSetting(val)
 }

util/configv3/color_test.go

@@ -49,6 +49,6 @@ var _ = Describe("Config", func() {
 		Entry("config=false env=unset disabled", "false", "", ColorDisabled),
 		Entry("config=true  env=unset disabled", "true", "", ColorEnabled),
 
-		Entry("config=unset env=unset falls back to default", "", "", ColorEnabled),
+		Entry("config=unset env=unset falls back to default", "", "", ColorAuto),
 	)
 })

util/configv3/load_config_test.go

@@ -57,7 +57,7 @@ var _ = Describe("Config", func() {
 				Expect(config).ToNot(BeNil())
 				Expect(config.Target()).To(Equal(DefaultTarget))
 				Expect(config.SkipSSLValidation()).To(BeFalse())
-				Expect(config.ColorEnabled()).To(Equal(ColorEnabled))
+				Expect(config.ColorEnabled()).To(Equal(ColorAuto))
 				Expect(config.PluginHome()).To(Equal(filepath.Join(homeDir, ".cf", "plugins")))
 				Expect(config.StagingTimeout()).To(Equal(DefaultStagingTimeout))
 				Expect(config.StartupTimeout()).To(Equal(DefaultStartupTimeout))
@@ -128,7 +128,7 @@ var _ = Describe("Config", func() {
 					Expect(config).ToNot(BeNil())
 					Expect(config.Target()).To(Equal(DefaultTarget))
 					Expect(config.SkipSSLValidation()).To(BeFalse())
-					Expect(config.ColorEnabled()).To(Equal(ColorEnabled))
+					Expect(config.ColorEnabled()).To(Equal(ColorAuto))
 					Expect(config.PluginHome()).To(Equal(filepath.Join(homeDir, ".cf", "plugins")))
 					Expect(config.StagingTimeout()).To(Equal(DefaultStagingTimeout))
 					Expect(config.StartupTimeout()).To(Equal(DefaultStartupTimeout))
@@ -203,7 +203,7 @@ var _ = Describe("Config", func() {
 					Expect(config).ToNot(BeNil())
 					Expect(config.Target()).To(Equal(DefaultTarget))
 					Expect(config.SkipSSLValidation()).To(BeFalse())
-					Expect(config.ColorEnabled()).To(Equal(ColorEnabled))
+					Expect(config.ColorEnabled()).To(Equal(ColorAuto))
 					Expect(config.PluginHome()).To(Equal(filepath.Join(homeDir, ".cf", "plugins")))
 					Expect(config.StagingTimeout()).To(Equal(DefaultStagingTimeout))
 					Expect(config.StartupTimeout()).To(Equal(DefaultStartupTimeout))