HistorySize.contents(): indent reference group lines hierarchically

Author: mhagger

sizes/output.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"strconv"
+	"strings"
 
 	"github.com/github/git-sizer/counts"
 	"github.com/github/git-sizer/git"
@@ -218,6 +219,26 @@ func (i *item) MarshalJSON() ([]byte, error) {
 	return json.Marshal(stat)
 }
 
+// Indented returns an `item` that is just like `i`, but indented by
+// `depth` more levels.
+func (i *item) Indented(depth int) tableContents {
+	return &indentedItem{
+		tableContents: i,
+		depth:         depth,
+	}
+}
+
+type indentedItem struct {
+	tableContents
+	depth int
+}
+
+func (i *indentedItem) Emit(t *table) {
+	subTable := t.indented("", i.depth)
+	i.tableContents.Emit(subTable)
+	t.addSection(subTable)
+}
+
 type Threshold float64
 
 // Methods to implement pflag.Value:
@@ -365,16 +386,20 @@ func (s HistorySize) TableString(
 	return t.generateHeader() + t.buf.String() + t.footnotes.String()
 }
 
-func (t *table) subTable(sectionHeader string) *table {
+func (t *table) indented(sectionHeader string, depth int) *table {
 	return &table{
 		threshold:     t.threshold,
 		nameStyle:     t.nameStyle,
 		sectionHeader: sectionHeader,
 		footnotes:     t.footnotes,
-		indent:        t.indent + 1,
+		indent:        t.indent + depth,
 	}
 }
 
+func (t *table) subTable(sectionHeader string) *table {
+	return t.indented(sectionHeader, 1)
+}
+
 func (t *table) addSection(subTable *table) {
 	if subTable.buf.Len() > 0 {
 		if t.buf.Len() == 0 {
@@ -449,14 +474,13 @@ func (s HistorySize) contents(refGroups []RefGroup) tableContents {
 		if !ok {
 			continue
 		}
-		rgis = append(
-			rgis,
-			I(
-				fmt.Sprintf("refgroup.%s", rg.Symbol), rg.Name,
-				fmt.Sprintf("The number of references in group '%s'", rg.Symbol),
-				nil, *count, metric, "", 25000,
-			),
+		rgi := I(
+			fmt.Sprintf("refgroup.%s", rg.Symbol), rg.Name,
+			fmt.Sprintf("The number of references in group '%s'", rg.Symbol),
+			nil, *count, metric, "", 25000,
 		)
+		indent := strings.Count(string(rg.Symbol), ".")
+		rgis = append(rgis, rgi.Indented(indent))
 	}
 
 	return S(