begin implementing separate metadata parsing

internal/util/file.go

@@ -1,6 +1,8 @@
 package util
 
 import (
+	"bufio"
+	"bytes"
 	"io"
 	"os"
 )
@@ -56,3 +58,25 @@ func CopyFile(inPath string, outPath string) error {
 		return nil
 	}
 }
+
+// ReadNLines reads the first N lines from a file as a single byte array
+func ReadNLines(filename string, n int) ([]byte, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var buffer bytes.Buffer
+	scanner := bufio.NewScanner(file)
+	for i := 0; i < 3 && scanner.Scan(); i++ {
+		buffer.Write(scanner.Bytes())
+		buffer.WriteByte('\n')
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return buffer.Bytes(), nil
+}

internal/util/queue.go

@@ -0,0 +1,26 @@
+package util
+
+// Enqueue appends an int to the queue
+func Enqueue(queue []int, element int) []int {
+	queue = append(queue, element)
+	return queue
+}
+
+// Dequeue pops the first element of the queue
+func Dequeue(queue []int) (int, []int) {
+	element := queue[0] // The first element is the one to be dequeued.
+	if len(queue) == 1 {
+		tmp := []int{}
+		return element, tmp
+	}
+	return element, queue[1:] // Slice off the element once it is dequeued.
+}
+
+func Tail(queue []int) int {
+	l := len(queue)
+	if l == 0 {
+		return -1
+	} else {
+		return l - 1
+	}
+}