refactor

tail.go

@@ -20,8 +20,7 @@ var (
 type Line struct {
 	Text string
 	Time time.Time
-	Err  error // If non-nil, this is an error from tail, and not a
+	Err  error // Error from tail
-	// log line itself.
 }
 
 // SeekInfo represents arguments to `os.Seek`
@@ -32,14 +31,16 @@ type SeekInfo struct {
 
 // Config is used to specify how a file must be tailed.
 type Config struct {
+	// File-specifc
 	Location  *SeekInfo // Seek to this location before tailing
-	Follow      bool      // Continue looking for new lines (tail -f)
 	ReOpen    bool      // Reopen recreated files (tail -F)
 	MustExist bool      // Fail early if the file does not exist
 	Poll      bool      // Poll for file changes instead of using inotify
+	LimitRate int64     // Maximum read rate (lines per second)
+
+	// Generic IO
+	Follow      bool // Continue looking for new lines (tail -f)
 	MaxLineSize int  // If non-zero, split longer lines into multiple lines
-	LimitRate   int64     // If non-zero, limit the rate of read log lines
-	// by this much per second.
 }
 
 type Tail struct {
@@ -298,27 +299,3 @@ func (tail *Tail) sendLine(line []byte) bool {
 
 	return true
 }
-
-// partitionString partitions the string into chunks of given size,
-// with the last chunk of variable size.
-func partitionString(s string, chunkSize int) []string {
-	if chunkSize <= 0 {
-		panic("invalid chunkSize")
-	}
-	length := len(s)
-	chunks := 1 + length/chunkSize
-	start := 0
-	end := chunkSize
-	parts := make([]string, 0, chunks)
-	for {
-		if end > length {
-			end = length
-		}
-		parts = append(parts, s[start:end])
-		if end == length {
-			break
-		}
-		start, end = end, end+chunkSize
-	}
-	return parts
-}

util.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2013 ActiveState Software Inc. All rights reserved.
+
+package tail
+
+// partitionString partitions the string into chunks of given size,
+// with the last chunk of variable size.
+func partitionString(s string, chunkSize int) []string {
+	if chunkSize <= 0 {
+		panic("invalid chunkSize")
+	}
+	length := len(s)
+	chunks := 1 + length/chunkSize
+	start := 0
+	end := chunkSize
+	parts := make([]string, 0, chunks)
+	for {
+		if end > length {
+			end = length
+		}
+		parts = append(parts, s[start:end])
+		if end == length {
+			break
+		}
+		start, end = end, end+chunkSize
+	}
+	return parts
+}