Use unified diff util (grafana#82)

go.mod

@@ -15,6 +15,7 @@ require (
 	github.com/mattn/go-colorable v0.1.6 // indirect
 	github.com/mitchellh/gox v1.0.1 // indirect
 	github.com/mitchellh/mapstructure v1.3.3
+	github.com/pmezard/go-difflib v1.0.0
 	github.com/rivo/tview v0.0.0-20200818120338-53d50e499bf9
 	github.com/stretchr/testify v1.5.1 // indirect
 	golang.org/x/crypto v0.0.0-20200422194213-44a606286825

pkg/grafana/dashboard-handler.go

@@ -6,8 +6,8 @@ import (
 	"strings"
 
 	"github.com/grafana/grizzly/pkg/grizzly"
-	"github.com/kylelemons/godebug/diff"
 	"github.com/mitchellh/mapstructure"
+	"github.com/pmezard/go-difflib/difflib"
 )
 
 /*
@@ -152,7 +152,14 @@ func (h *DashboardHandler) Diff(notifier grizzly.Notifier, resources grizzly.Res
 		if local == remoteRepresentation {
 			notifier.NoChanges(resource)
 		} else {
-			difference := diff.Diff(remoteRepresentation, local)
+			diff := difflib.UnifiedDiff{
+				A:        difflib.SplitLines(remoteRepresentation),
+				B:        difflib.SplitLines(local),
+				FromFile: "Remote",
+				ToFile:   "Local",
+				Context:  3,
+			}
+			difference, _ := difflib.GetUnifiedDiffString(diff)
 			notifier.HasChanges(resource, difference)
 		}
 	}

pkg/grizzly/workflow.go

@@ -11,7 +11,7 @@ import (
 
 	"github.com/google/go-jsonnet"
 	"github.com/grafana/grizzly/pkg/term"
-	"github.com/kylelemons/godebug/diff"
+	"github.com/pmezard/go-difflib/difflib"
 	"golang.org/x/crypto/ssh/terminal"
 	"gopkg.in/fsnotify.v1"
 )
@@ -196,7 +196,14 @@ func Diff(config Config, resources Resources) error {
 			if local == remoteRepresentation {
 				config.Notifier.NoChanges(resource)
 			} else {
-				difference := diff.Diff(remoteRepresentation, local)
+				diff := difflib.UnifiedDiff{
+					A:        difflib.SplitLines(remoteRepresentation),
+					B:        difflib.SplitLines(local),
+					FromFile: "Remote",
+					ToFile:   "Local",
+					Context:  3,
+				}
+				difference, _ := difflib.GetUnifiedDiffString(diff)
 				config.Notifier.HasChanges(resource, difference)
 			}
 		}