feat: enable colored output (#17)

johnstcn · jawnsy · web-flow · commit d788ecd82030 · 2021-09-14T18:07:56.000+01:00
* feat: enable colored output
* Update internal/api/types_test.go

Co-authored-by: Jonathan Yu &lt;jonathan@coder.com&gt;
diff --git a/go.mod b/go.mod
@@ -5,6 +5,7 @@ go 1.16
 require (
 	cdr.dev/slog v1.4.1
 	github.com/Masterminds/semver/v3 v3.1.1
+	github.com/fatih/color v1.12.0
 	github.com/spf13/cobra v1.2.1
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 	k8s.io/api v0.19.14
diff --git a/internal/api/types.go b/internal/api/types.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/fatih/color"
 	"golang.org/x/xerrors"
 )
 
@@ -57,11 +58,11 @@ func (s CheckState) MustEmoji() string {
 func (s CheckState) Emoji() (string, error) {
 	switch s {
 	case StatePassed:
-		return "👍", nil
+		return "✓", nil
 	case StateWarning:
 		return "⚠️", nil
 	case StateFailed:
-		return "👎", nil
+		return "✗", nil
 	case StateInfo:
 		return "🔔", nil
 	case StateSkipped:
@@ -113,6 +114,33 @@ func (s CheckState) String() string {
 	panic(fmt.Sprintf("unknown state: %d", s))
 }
 
+type PrintFunc func(format string, args ...interface{}) string
+
+var _ PrintFunc = fmt.Sprintf
+
+func (s CheckState) Color() (PrintFunc, error) {
+	switch s {
+	case StatePassed:
+		return color.GreenString, nil
+	case StateFailed:
+		return color.RedString, nil
+	case StateWarning:
+		return color.YellowString, nil
+	case StateInfo, StateSkipped:
+		return fmt.Sprintf, nil
+	default:
+		return nil, xerrors.Errorf("unknown state: %d", s)
+	}
+}
+
+func (s CheckState) MustColor() PrintFunc {
+	printFunc, err := s.Color()
+	if err != nil {
+		panic(err.Error())
+	}
+	return printFunc
+}
+
 type CheckResult struct {
 	Name    string                 `json:"name"`
 	State   CheckState             `json:"state"`
diff --git a/internal/api/types_test.go b/internal/api/types_test.go
@@ -34,6 +34,11 @@ func TestKnownStates(t *testing.T) {
 			assert.True(t, "state.Text() is non-empty", len(text) > 0)
 			_ = state.MustText()
 
+			colorFunc, err := state.Color()
+			assert.Success(t, "state.Color() error nil", err)
+			assert.True(t, "state.Color() is non-nil", colorFunc != nil)
+			_ = state.MustColor()
+
 			str := state.String()
 			assert.True(t, "state.String() is non-empty", len(str) > 0)
 		})
diff --git a/internal/humanwriter/human.go b/internal/humanwriter/human.go
@@ -82,6 +82,11 @@ func (w *HumanResultWriter) WriteResult(result *api.CheckResult) error {
 		return err
 	}
 
-	_, err = fmt.Fprintf(w.out, "%s %s\n", prefix, result.Summary)
+	var printFunc api.PrintFunc = fmt.Sprintf
+	if w.colors {
+		printFunc = result.State.MustColor()
+	}
+
+	_, err = fmt.Fprintln(w.out, printFunc(prefix), result.Summary)
 	return err
 }
diff --git a/internal/humanwriter/human_test.go b/internal/humanwriter/human_test.go
@@ -52,9 +52,9 @@ func TestHumanWriter(t *testing.T) {
 			var expected string
 			switch mode {
 			case humanwriter.OutputModeEmoji:
-				expected = "👍 human writer check test\n" +
+				expected = "✓ human writer check test\n" +
 					"🔔 summary\n" +
-					"👎 failed message\n" +
+					"✗ failed message\n" +
 					"⚠️ \n" +
 					"⏩ skipped check\n"
 			case humanwriter.OutputModeText:

Original file line number	Diff line number	Diff line change
`@@ -82,6 +82,11 @@ func (w HumanResultWriter) WriteResult(result api.CheckResult) error {`
`82`	`82`	`return err`
`83`	`83`	`}`
`84`	`84`
`85`		`- _, err = fmt.Fprintf(w.out, "%s %s\n", prefix, result.Summary)`
	`85`	`+ var printFunc api.PrintFunc = fmt.Sprintf`
	`86`	`+ if w.colors {`
	`87`	`+ printFunc = result.State.MustColor()`
	`88`	`+ }`
	`89`	`+`
	`90`	`+ _, err = fmt.Fprintln(w.out, printFunc(prefix), result.Summary)`
`86`	`91`	`return err`
`87`	`92`	`}`