move types to types package

types/helpers.go

@@ -2,6 +2,8 @@ package types
 
 import (
 	"time"
+
+	gterm "github.com/taigrr/gico/gitgraph/term"
 )
 
 func NewDataSet() DataSet {
@@ -9,10 +11,27 @@ func NewDataSet() DataSet {
 }
 
 func NewCommit(Author, Message, Repo, Path string, LOC int) Commit {
-	ci := Commit{
+	return Commit{
 		Message: Message,
 		Author:  Author, LOC: LOC, TimeStamp: time.Now(),
 		Repo: Repo, Path: Path,
 	}
-	return ci
+}
+
+func (yf YearFreq) String() string {
+	return gterm.GetYearUnicode(yf)
+}
+
+func (a YearFreq) Merge(b YearFreq) YearFreq {
+	x := len(a)
+	y := len(b)
+	if x < y {
+		x = y
+	}
+	c := make(YearFreq, x)
+	copy(c, a)
+	for i := 0; i < y; i++ {
+		c[i] += b[i]
+	}
+	return c
 }