rename MultilineDiff, return diff count

cmd/experiment/main.go

@@ -1,22 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	"github.com/RageCage64/multilinediff"
-)
-
-func main() {
-	a := `a
-b
-c
-diff`
-	b := `a
-b
-c
-f
-f
-f`
-
-	fmt.Println(multilinediff.MultilineDiff(a, b, "\n"))
-}

internal/experiment/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/RageCage64/multilinediff"
+)
+
+func main() {
+	a := `a
+b
+c
+diff`
+	b := `a b
+c
+f
+f
+f
+diff`
+	diff, count := multilinediff.Diff(a, b, "\n")
+	fmt.Println(count)
+	fmt.Println("--------")
+	fmt.Println(diff)
+}

multilinediff.go

@@ -7,10 +7,9 @@ import (
 	"github.com/google/go-cmp/cmp/cmpopts"
 )
 
-func MultilineDiff(a, b, lineSep string) string {
-	reporter := Reporter{
-		LineSep: lineSep,
-	}
+// Get the diff between two strings.
+func Diff(a, b, lineSep string) (string, int) {
+	reporter := Reporter{LineSep: lineSep}
 	cmp.Diff(
 		a, b,
 		cmpopts.AcyclicTransformer("multiline", func(s string) []string {
@@ -18,5 +17,5 @@ func MultilineDiff(a, b, lineSep string) string {
 		}),
 		cmp.Reporter(&reporter),
 	)
-	return reporter.String()
+	return reporter.String(), reporter.DiffCount
 }

reporter.go

@@ -46,12 +46,13 @@ func (l diffLine) toLine(length int) string {
 	return line
 }
 
+// A pretty reporter to pass into cmp.Diff using the cmd.Reporter function.
 type Reporter struct {
-	LineSep string
+	LineSep   string
+	DiffCount int
 
-	path      cmp.Path
-	lines     []diffLine
-	diffCount int
+	path  cmp.Path
+	lines []diffLine
 }
 
 func (r *Reporter) PushStep(ps cmp.PathStep) {
@@ -62,7 +63,7 @@ func (r *Reporter) Report(rs cmp.Result) {
 	line := diffLine{}
 	vOld, vNew := r.path.Last().Values()
 	if !rs.Equal() {
-		r.diffCount++
+		r.DiffCount++
 		if vOld.IsValid() {
 			line.diff = diffTypeChange
 			line.old = fmt.Sprintf("%+v", vOld)