Introduce method HistorySize.TableString()

Use it instead of the old `TableString()` top-level function.

Author: mhagger

git-sizer.go

@@ -172,7 +172,7 @@ func mainImplementation() error {
 		}
 		fmt.Printf("%s\n", j)
 	} else {
-		io.WriteString(os.Stdout, sizes.TableString(historySize.Contents(), threshold, nameStyle))
+		io.WriteString(os.Stdout, historySize.TableString(threshold, nameStyle))
 	}
 
 	return nil

sizes/output.go

@@ -345,7 +345,8 @@ type table struct {
 	buf           bytes.Buffer
 }
 
-func TableString(contents tableContents, threshold Threshold, nameStyle NameStyle) string {
+func (s HistorySize) TableString(threshold Threshold, nameStyle NameStyle) string {
+	contents := s.Contents()
 	t := table{
 		threshold: threshold,
 		nameStyle: nameStyle,