feat: add csv support for contributors insights

cmd/insights/contributors.go

@@ -1,7 +1,9 @@
 package insights
 
 import (
+	"bytes"
 	"context"
+	"encoding/csv"
 	"errors"
 	"fmt"
 	"net/http"
@@ -134,11 +136,29 @@ func (cis contributorsInsightsSlice) BuildOutput(format string) (string, error)
 		return utils.OutputJSON(cis)
 	case constants.OutputYAML:
 		return utils.OutputYAML(cis)
+	case constants.OuputCSV:
+		return cis.OutputCSV()
 	default:
 		return "", fmt.Errorf("unknown output format %s", format)
 	}
 }
 
+func (cis contributorsInsightsSlice) OutputCSV() (string, error) {
+	if len(cis) == 0 {
+		return "", fmt.Errorf("repository is either non-existent or has not been indexed yet")
+	}
+	b := new(bytes.Buffer)
+	writer := csv.NewWriter(b)
+	err := writer.WriteAll([][]string{{"Repository URl", "New Contributors", "Recent Contributors", "Alumni Contributors", "Repeat Contributors"}, {
+		cis[0].RepoURL, strconv.Itoa(len(cis[0].New)), strconv.Itoa(len(cis[0].Recent)), strconv.Itoa(len(cis[0].Alumni)), strconv.Itoa(len(cis[0].Repeat)),
+	}})
+	if err != nil {
+		return "", err
+	}
+
+	return b.String(), nil
+}
+
 func (cis contributorsInsightsSlice) OutputTable() (string, error) {
 	tables := make([]string, 0, len(cis))
 	for i := range cis {

pkg/constants/output.go

@@ -4,4 +4,5 @@ const (
 	OutputJSON  = "json"
 	OutputTable = "table"
 	OutputYAML  = "yaml"
+	OuputCSV    = "csv"
 )