Add a simple spinner when running flux diff kustomization

If implemented, users will see a spinner run while the diff is on-going.

Signed-off-by: Soule BA <soule@weave.works>

go.mod

@@ -35,6 +35,7 @@ require (
 	github.com/olekukonko/tablewriter v0.0.4
 	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
+	github.com/theckman/yacspin v0.13.12
 	golang.org/x/crypto v0.0.0-20211215153901-e495a2d5b3d3
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
 	k8s.io/api v0.23.1
@@ -73,6 +74,7 @@ require (
 	github.com/emirpasic/gods v1.12.0 // indirect
 	github.com/evanphx/json-patch v4.12.0+incompatible // indirect
 	github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d // indirect
+	github.com/fatih/color v1.13.0 // indirect
 	github.com/fluxcd/pkg/apis/acl v0.0.3 // indirect
 	github.com/form3tech-oss/jwt-go v3.2.3+incompatible // indirect
 	github.com/fvbommel/sortorder v1.0.1 // indirect
@@ -108,8 +110,9 @@ require (
 	github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect
 	github.com/mailru/easyjson v0.7.6 // indirect
 	github.com/mattn/go-ciede2000 v0.0.0-20170301095244-782e8c62fec3 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/mattn/go-runewidth v0.0.7 // indirect
+	github.com/mattn/go-runewidth v0.0.13 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-ps v1.0.0 // indirect
 	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
@@ -122,6 +125,7 @@ require (
 	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/russross/blackfriday v1.5.2 // indirect
 	github.com/russross/blackfriday/v2 v2.0.1 // indirect
 	github.com/sergi/go-diff v1.2.0 // indirect

go.sum

@@ -221,6 +221,8 @@ github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d h1:105gxyaGwC
 github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d/go.mod h1:ZZMPRZwes7CROmyNKgQzC3XPs6L/G2EJLHddWejkmf4=
 github.com/fatih/camelcase v1.0.0/go.mod h1:yN2Sb0lFhZJUdVvtELVWefmrXpuZESvPmqwoZc+/fpc=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
+github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/felixge/httpsnoop v1.0.1/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
 github.com/fluxcd/go-git-providers v0.5.3 h1:Sg5XH+aXb6mYwITtdE4yc4yLoyFW3aVZx33qWuQb9/Q=
 github.com/fluxcd/go-git-providers v0.5.3/go.mod h1:4jTHTmSx3rFGnG78KUVgFYeG6vWFnKwUSr2mi31tvp8=
@@ -570,6 +572,9 @@ github.com/matryer/is v1.2.0/go.mod h1:2fLPjFQM9rhQ15aVEtbuwhJinnOqrmgXPNdZsdwlW
 github.com/mattn/go-ciede2000 v0.0.0-20170301095244-782e8c62fec3 h1:BXxTozrOU8zgC5dkpn3J6NTRdoP+hjok/e+ACr4Hibk=
 github.com/mattn/go-ciede2000 v0.0.0-20170301095244-782e8c62fec3/go.mod h1:x1uk6vxTiVuNt6S5R2UYgdhpj3oKojXvOXauHZ7dEnI=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
+github.com/mattn/go-colorable v0.1.9/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=
+github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
@@ -577,8 +582,9 @@ github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Ky
 github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
 github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
-github.com/mattn/go-runewidth v0.0.7 h1:Ei8KR0497xHyKJPAv59M1dkC+rOZCMBJ+t3fZ+twI54=
 github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
+github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mattn/go-shellwords v1.0.12 h1:M2zGm7EW6UQJvDeQxo4T51eKPurbeFbe8WtebGE2xrk=
 github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lLtQsUlTZDWQ8Y=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
@@ -706,6 +712,8 @@ github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3x
 github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/remyoudompheng/bigfft v0.0.0-20170806203942-52369c62f446/go.mod h1:uYEyJGbgTkfkS4+E/PavXkNJcbFIpEtjt2B0KDQ5+9M=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
@@ -771,6 +779,8 @@ github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/texttheater/golang-levenshtein v1.0.1 h1:+cRNoVrfiwufQPhoMzB6N0Yf/Mqajr6t1lOv8GyGE2U=
 github.com/texttheater/golang-levenshtein v1.0.1/go.mod h1:PYAKrbF5sAiq9wd+H82hs7gNaen0CplQ9uvm6+enD/8=
+github.com/theckman/yacspin v0.13.12 h1:CdZ57+n0U6JMuh2xqjnjRq5Haj6v1ner2djtLQRzJr4=
+github.com/theckman/yacspin v0.13.12/go.mod h1:Rd2+oG2LmQi5f3zC3yeZAOl245z8QOvrH4OPOJNZxLg=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20201229170055-e5319fda7802/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
@@ -1049,6 +1059,7 @@ golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210817190340-bfb29a6856f2/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210917161153-d61c044b1678/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211029165221-6e7872819dc8 h1:M69LAlWZCshgp0QSzyDcSsSIejIEeuaCVpmwcKwyLMk=
 golang.org/x/sys v0.0.0-20211029165221-6e7872819dc8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=

internal/build/diff.go

@@ -26,6 +26,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"time"
 
 	kustomizev1 "github.com/fluxcd/kustomize-controller/api/v1beta2"
 	"github.com/fluxcd/pkg/ssa"
@@ -35,6 +36,7 @@ import (
 	"github.com/hashicorp/go-multierror"
 	"github.com/homeport/dyff/pkg/dyff"
 	"github.com/lucasb-eyer/go-colorful"
+	"github.com/theckman/yacspin"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"sigs.k8s.io/cli-utils/pkg/kstatus/polling"
@@ -53,6 +55,21 @@ func (b *Builder) Manager() (*ssa.ResourceManager, error) {
 }
 
 func (b *Builder) Diff() (string, bool, error) {
+	// Add a spiner
+	cfg := yacspin.Config{
+		Frequency:       100 * time.Millisecond,
+		CharSet:         yacspin.CharSets[59],
+		Suffix:          "Kustomization diffing...",
+		SuffixAutoColon: true,
+		Message:         "running dry-run",
+		StopCharacter:   "✓",
+		StopColors:      []string{"fgGreen"},
+	}
+	spinner, err := yacspin.New(cfg)
+	if err != nil {
+		return "", false, fmt.Errorf("failed to create spinner: %w", err)
+	}
+
 	output := strings.Builder{}
 	createdOrDrifted := false
 	res, err := b.Build()
@@ -77,6 +94,11 @@ func (b *Builder) Diff() (string, bool, error) {
 		return "", createdOrDrifted, err
 	}
 
+	err = spinner.Start()
+	if err != nil {
+		return "", false, fmt.Errorf("failed to start spinner: %w", err)
+	}
+
 	var diffErrs error
 	// create an inventory of objects to be reconciled
 	newInventory := newInventory()
@@ -123,6 +145,8 @@ func (b *Builder) Diff() (string, bool, error) {
 		addObjectsToInventory(newInventory, change)
 	}
 
+	spinner.Message("processing inventory")
+
 	if b.kustomization.Spec.Prune && diffErrs == nil {
 		oldStatus := b.kustomization.Status.DeepCopy()
 		if oldStatus.Inventory != nil {
@@ -136,6 +160,11 @@ func (b *Builder) Diff() (string, bool, error) {
 		}
 	}
 
+	err = spinner.Stop()
+	if err != nil {
+		return "", createdOrDrifted, fmt.Errorf("failed to stop spinner: %w", err)
+	}
+
 	return output.String(), createdOrDrifted, diffErrs
 }