textfile collector: updating utfbom dependency and simplifying code

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

Gopkg.lock

@@ -37,12 +37,12 @@
   revision = "4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9"
 
 [[projects]]
-  digest = "1:ec6271918b59b872a2d25e374569a4f75f1839d91e4191470c297b7eaaaf7641"
+  digest = "1:f9adc21a937e5da643ea14a3488cb7506788876737a5e205394e508627a6eec8"
   name = "github.com/dimchansky/utfbom"
   packages = ["."]
   pruneopts = "NUT"
-  revision = "5448fe645cb1964ba70ac8f9f2ffe975e61a536c"
-  version = "v1.0.0"
+  revision = "d2133a1ce379ef6fa992b0514a77146c60db9d1c"
+  version = "v1.1.0"
 
 [[projects]]
   digest = "1:cb4e216bd9f58866f42dc65893455b24f879b026fdaa1ecc3aafff625fdb5a66"

collector/textfile.go

@@ -288,19 +288,9 @@ fileLoop:
 }
 
 func checkBOM(encoding utfbom.Encoding) error {
-	bom := ""
-	switch encoding {
-	case utfbom.Unknown, utfbom.UTF8:
+	if encoding == utfbom.Unknown || encoding == utfbom.UTF8 {
 		return nil
-	case utfbom.UTF16BigEndian:
-		bom = "UTF16BigEndian"
-	case utfbom.UTF16LittleEndian:
-		bom = "UTF16LittleEndian"
-	case utfbom.UTF32BigEndian:
-		bom = "UTF32BigEndian"
-	case utfbom.UTF32LittleEndian:
-		bom = "UTF32LittleEndian"
 	}
 
-	return fmt.Errorf(bom)
+	return fmt.Errorf(encoding.String())
 }

vendor/github.com/dimchansky/utfbom/utfbom.go

@@ -32,6 +32,24 @@ const (
 	UTF32LittleEndian
 )
 
+// String returns a user-friendly string representation of the encoding. Satisfies fmt.Stringer interface.
+func (e Encoding) String() string {
+	switch e {
+	case UTF8:
+		return "UTF8"
+	case UTF16BigEndian:
+		return "UTF16BigEndian"
+	case UTF16LittleEndian:
+		return "UTF16LittleEndian"
+	case UTF32BigEndian:
+		return "UTF32BigEndian"
+	case UTF32LittleEndian:
+		return "UTF32LittleEndian"
+	default:
+		return "Unknown"
+	}
+}
+
 const maxConsecutiveEmptyReads = 100
 
 // Skip creates Reader which automatically detects BOM (Unicode Byte Order Mark) and removes it as necessary.