Add support for "pretty" output (#195)

* feat: add pretty output format

---------

Co-authored-by: William Yardley <wyardley@users.noreply.github.com>

pkg/config/config.go

@@ -74,7 +74,7 @@ func FromFlags(progName string, args []string) (Config, string, error) {
 	flags.BoolVar(&c.Summary, "summary", false, "print a summary at the end (ignored for junit output)")
 	flags.IntVar(&c.NumberOfWorkers, "n", 4, "number of goroutines to run concurrently")
 	flags.BoolVar(&c.Strict, "strict", false, "disallow additional properties not in schema or duplicated keys")
-	flags.StringVar(&c.OutputFormat, "output", "text", "output format - json, junit, tap, text")
+	flags.StringVar(&c.OutputFormat, "output", "text", "output format - json, junit, pretty, tap, text")
 	flags.BoolVar(&c.Verbose, "verbose", false, "print results for all resources (ignored for tap and junit output)")
 	flags.BoolVar(&c.SkipTLS, "insecure-skip-tls-verify", false, "disable verification of the server's SSL certificate. This will make your HTTPS connections insecure")
 	flags.StringVar(&c.Cache, "cache", "", "cache schemas downloaded via HTTP to this folder")

pkg/output/output.go

@@ -20,6 +20,8 @@ func New(outputFormat string, printSummary, isStdin, verbose bool) (Output, erro
 		return jsonOutput(w, printSummary, isStdin, verbose), nil
 	case outputFormat == "junit":
 		return junitOutput(w, printSummary, isStdin, verbose), nil
+	case outputFormat == "pretty":
+		return prettyOutput(w, printSummary, isStdin, verbose), nil
 	case outputFormat == "tap":
 		return tapOutput(w, printSummary, isStdin, verbose), nil
 	case outputFormat == "text":

pkg/output/pretty.go

@@ -0,0 +1,109 @@
+package output
+
+import (
+	"fmt"
+	"io"
+	"sync"
+
+	"github.com/yannh/kubeconform/pkg/validator"
+)
+
+type prettyo struct {
+	sync.Mutex
+	w                                   io.Writer
+	withSummary                         bool
+	isStdin                             bool
+	verbose                             bool
+	files                               map[string]bool
+	nValid, nInvalid, nErrors, nSkipped int
+}
+
+// Text will output the results of the validation as a texto
+func prettyOutput(w io.Writer, withSummary, isStdin, verbose bool) Output {
+	return &prettyo{
+		w:           w,
+		withSummary: withSummary,
+		isStdin:     isStdin,
+		verbose:     verbose,
+		files:       map[string]bool{},
+		nValid:      0,
+		nInvalid:    0,
+		nErrors:     0,
+		nSkipped:    0,
+	}
+}
+
+func (o *prettyo) Write(result validator.Result) error {
+	checkmark := "\u2714"
+	multiplicationSign := "\u2716"
+	reset := "\033[0m"
+	cRed := "\033[31m"
+	cGreen := "\033[32m"
+	cYellow := "\033[33m"
+
+	o.Lock()
+	defer o.Unlock()
+
+	var err error
+
+	sig, _ := result.Resource.Signature()
+
+	o.files[result.Resource.Path] = true
+	switch result.Status {
+	case validator.Valid:
+		if o.verbose {
+			fmt.Fprintf(o.w, "%s%s%s %s: %s%s %s is valid%s\n", cGreen, checkmark, reset, result.Resource.Path, cGreen, sig.Kind, sig.Name, reset)
+		}
+		o.nValid++
+	case validator.Invalid:
+		fmt.Fprintf(o.w, "%s%s%s %s: %s%s %s is invalid: %s%s\n", cRed, multiplicationSign, reset, result.Resource.Path, cRed, sig.Kind, sig.Name, result.Err.Error(), reset)
+
+		o.nInvalid++
+	case validator.Error:
+		fmt.Fprintf(o.w, "%s%s%s %s: ", cRed, multiplicationSign, reset, result.Resource.Path)
+		if sig.Kind != "" && sig.Name != "" {
+			fmt.Fprintf(o.w, "%s%s failed validation: %s %s%s\n", cRed, sig.Kind, sig.Name, result.Err.Error(), reset)
+		} else {
+			fmt.Fprintf(o.w, "%sfailed validation: %s %s%s\n", cRed, sig.Name, result.Err.Error(), reset)
+		}
+		o.nErrors++
+	case validator.Skipped:
+		if o.verbose {
+			fmt.Fprintf(o.w, "%s-%s %s: ", cYellow, reset, result.Resource.Path)
+			if sig.Kind != "" && sig.Name != "" {
+				fmt.Fprintf(o.w, "%s%s %s skipped%s\n", cYellow, sig.Kind, sig.Name, reset)
+			} else if sig.Kind != "" {
+				fmt.Fprintf(o.w, "%s%s skipped%s\n", cYellow, sig.Kind, reset)
+			} else {
+				fmt.Fprintf(o.w, "%sskipped%s\n", cYellow, reset)
+			}
+		}
+		o.nSkipped++
+	case validator.Empty: // sent to ensure we count the filename as parsed
+	}
+
+	return err
+}
+
+func (o *prettyo) Flush() error {
+	var err error
+	if o.withSummary {
+		nFiles := len(o.files)
+		nResources := o.nValid + o.nInvalid + o.nErrors + o.nSkipped
+		resourcesPlural := ""
+		if nResources > 1 {
+			resourcesPlural = "s"
+		}
+		filesPlural := ""
+		if nFiles > 1 {
+			filesPlural = "s"
+		}
+		if o.isStdin {
+			_, err = fmt.Fprintf(o.w, "Summary: %d resource%s found parsing stdin - Valid: %d, Invalid: %d, Errors: %d, Skipped: %d\n", nResources, resourcesPlural, o.nValid, o.nInvalid, o.nErrors, o.nSkipped)
+		} else {
+			_, err = fmt.Fprintf(o.w, "Summary: %d resource%s found in %d file%s - Valid: %d, Invalid: %d, Errors: %d, Skipped: %d\n", nResources, resourcesPlural, nFiles, filesPlural, o.nValid, o.nInvalid, o.nErrors, o.nSkipped)
+		}
+	}
+
+	return err
+}

pkg/output/pretty_test.go

@@ -0,0 +1,84 @@
+package output
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/yannh/kubeconform/pkg/resource"
+	"github.com/yannh/kubeconform/pkg/validator"
+)
+
+func TestPrettyTextWrite(t *testing.T) {
+	for _, testCase := range []struct {
+		name        string
+		withSummary bool
+		isStdin     bool
+		verbose     bool
+		results     []validator.Result
+		expect      string
+	}{
+		{
+			"a single deployment, no summary, no verbose",
+			false,
+			false,
+			false,
+			[]validator.Result{},
+			"",
+		},
+		{
+			"a single deployment, summary, no verbose",
+			true,
+			false,
+			false,
+			[]validator.Result{
+				{
+					Resource: resource.Resource{
+						Path: "deployment.yml",
+						Bytes: []byte(`apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: "my-app"
+`),
+					},
+					Status: validator.Valid,
+					Err:    nil,
+				},
+			},
+			"Summary: 1 resource found in 1 file - Valid: 1, Invalid: 0, Errors: 0, Skipped: 0\n",
+		},
+		{
+			"a single deployment, verbose, with summary",
+			true,
+			false,
+			true,
+			[]validator.Result{
+				{
+					Resource: resource.Resource{
+						Path: "deployment.yml",
+						Bytes: []byte(`apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: "my-app"
+`),
+					},
+					Status: validator.Valid,
+					Err:    nil,
+				},
+			},
+			"\033[32m✔\033[0m deployment.yml: \033[32mDeployment my-app is valid\033[0m\n" +
+				"Summary: 1 resource found in 1 file - Valid: 1, Invalid: 0, Errors: 0, Skipped: 0\n",
+		},
+	} {
+		w := new(bytes.Buffer)
+		o := prettyOutput(w, testCase.withSummary, testCase.isStdin, testCase.verbose)
+
+		for _, res := range testCase.results {
+			o.Write(res)
+		}
+		o.Flush()
+
+		if w.String() != testCase.expect {
+			t.Errorf("%s - expected, but got:\n%s\n%s\n", testCase.name, testCase.expect, w)
+		}
+	}
+}