Fix the build breakage and improve the output so it is machine parsea…

…ble.

badger/cmd/info.go

@@ -89,7 +89,7 @@ to the Dgraph team.
 		}
 		if opt.sizeHistogram {
 			// use prefix as nil since we want to list all keys
-			db.ShowKeyValueSizeHistogram(nil)
+			db.PrintHistogram(nil)
 		}
 	},
 }
@@ -104,16 +104,14 @@ func dur(src, dst time.Time) string {
 
 func tableInfo(dir, valueDir string, db *badger.DB) error {
 	tables := db.Tables()
-	fmt.Printf("\n%s SSTables %[1]s\n", strings.Repeat("=", 45))
-	fmt.Printf("%-5s\t%-10s\t%-30s\t%-30s\t%-7s\n", "ID", "Level",
-		"Left-Key(in hex) (Time)", "Right-Key(in hex) (Time)", "Total Keys")
-	fmt.Printf("%s\n", strings.Repeat("=", 100))
+	fmt.Println()
+	fmt.Println("SSTable [Li, Id, Total Keys including internal keys] [Left Key, Version -> Right Key, Version]")
 	for _, t := range tables {
 		lk, lt := y.ParseKey(t.Left), y.ParseTs(t.Left)
 		rk, rt := y.ParseKey(t.Right), y.ParseTs(t.Right)
 
-		fmt.Printf("%-5d\tL%-9d\t%-30s\t%-30s\t%-7d\n", t.ID, t.Level,
-			fmt.Sprintf("%X (v%d)", lk, lt), fmt.Sprintf("%X (v%d)", rk, rt), t.KeyCount)
+		fmt.Printf("SSTable [L%d, %03d, %07d] [%20X, v%d -> %20X, v%d]\n",
+			t.Level, t.ID, t.KeyCount, lk, lt, rk, rt)
 	}
 	fmt.Println()
 	return nil

histogram.go

@@ -21,15 +21,15 @@ import (
 	"math"
 )
 
-// PrintKeyValueHistogram builds and displays the key-value size histogram.
+// PrintHistogram builds and displays the key-value size histogram.
 // When keyPrefix is set, only the keys that have prefix "keyPrefix" are
 // considered for creating the histogram
-func (db *DB) PrintKeyValueHistogram(keyPrefix []byte) {
+func (db *DB) PrintHistogram(keyPrefix []byte) {
 	if db == nil {
 		fmt.Println("\nCannot build histogram: DB is nil.")
 		return
 	}
-	histogram := db.buildKeyValueSizeHistogram(keyPrefix)
+	histogram := db.buildHistogram(keyPrefix)
 	fmt.Printf("Histogram of key sizes (in bytes)\n")
 	histogram.keySizeHistogram.printHistogram()
 	fmt.Printf("Histogram of value sizes (in bytes)\n")
@@ -46,18 +46,18 @@ type histogramData struct {
 	sum         int64
 }
 
-// keyValueSizeHistogram contains keySize histogram and valueSize histogram
-type keyValueSizeHistogram struct {
+// sizeHistogram contains keySize histogram and valueSize histogram
+type sizeHistogram struct {
 	keySizeHistogram, valueSizeHistogram histogramData
 }
 
-// newKeyValueSizeHistogram returns a new instance of keyValueSizeHistogram with
+// newSizeHistogram returns a new instance of keyValueSizeHistogram with
 // properly initialized fields.
-func newKeyValueSizeHistogram() *keyValueSizeHistogram {
+func newSizeHistogram() *sizeHistogram {
 	// TODO(ibrahim): find appropriate bin size.
 	keyBins := createHistogramBins(1, 16)
 	valueBins := createHistogramBins(1, 30)
-	return &keyValueSizeHistogram{
+	return &sizeHistogram{
 		keySizeHistogram: histogramData{
 			bins:        keyBins,
 			countPerBin: make([]int64, len(keyBins)+1),
@@ -113,17 +113,17 @@ func (histogram *histogramData) Update(value int64) {
 	}
 }
 
-// buildKeyValueSizeHistogram builds the key-value size histogram.
+// buildHistogram builds the key-value size histogram.
 // When keyPrefix is set, only the keys that have prefix "keyPrefix" are
 // considered for creating the histogram
-func (db *DB) buildKeyValueSizeHistogram(keyPrefix []byte) *keyValueSizeHistogram {
+func (db *DB) buildHistogram(keyPrefix []byte) *sizeHistogram {
 	txn := db.NewTransaction(false)
 	defer txn.Discard()
 
 	itr := txn.NewIterator(DefaultIteratorOptions)
 	defer itr.Close()
 
-	badgerHistogram := newKeyValueSizeHistogram()
+	badgerHistogram := newSizeHistogram()
 
 	// Collect key and value sizes.
 	for itr.Seek(keyPrefix); itr.ValidForPrefix(keyPrefix); itr.Next() {

histogram_test.go

@@ -37,7 +37,7 @@ func TestBuildKeyValueSizeHistogram(t *testing.T) {
 			})
 			require.NoError(t, err)
 
-			histogram := db.buildKeyValueSizeHistogram(nil)
+			histogram := db.buildHistogram(nil)
 			keyHistogram := histogram.keySizeHistogram
 			valueHistogram := histogram.valueSizeHistogram
 
@@ -79,7 +79,7 @@ func TestBuildKeyValueSizeHistogram(t *testing.T) {
 			})
 			require.NoError(t, err)
 
-			histogram := db.buildKeyValueSizeHistogram(nil)
+			histogram := db.buildHistogram(nil)
 			keyHistogram := histogram.keySizeHistogram
 			valueHistogram := histogram.valueSizeHistogram