feat: add output query param on serve mode & refactor output logic

Signed-off-by: Matthis Holleville <matthish29@gmail.com>

pkg/analysis/output.go

@@ -0,0 +1,72 @@
+package analysis
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/fatih/color"
+)
+
+var outputFormats = map[string]func(*Analysis) ([]byte, error){
+	"json": (*Analysis).jsonOutput,
+	"text": (*Analysis).textOutput,
+}
+
+func getOutputFormats() []string {
+	formats := make([]string, 0, len(outputFormats))
+	for format := range outputFormats {
+		formats = append(formats, format)
+	}
+	return formats
+}
+
+func (a *Analysis) PrintOutput(format string) ([]byte, error) {
+	outputFunc, ok := outputFormats[format]
+	if !ok {
+		return nil, fmt.Errorf("unsupported output format: %s. Available format %s", format, strings.Join(getOutputFormats(), ","))
+	}
+	return outputFunc(a)
+}
+
+func (a *Analysis) jsonOutput() ([]byte, error) {
+	var problems int
+	var status AnalysisStatus
+	for _, result := range a.Results {
+		problems += len(result.Error)
+	}
+	if problems > 0 {
+		status = StateProblemDetected
+	} else {
+		status = StateOK
+	}
+
+	result := JsonOutput{
+		Problems: problems,
+		Results:  a.Results,
+		Status:   status,
+	}
+	output, err := json.MarshalIndent(result, "", "  ")
+	if err != nil {
+		return nil, fmt.Errorf("error marshalling json: %v", err)
+	}
+	return output, nil
+}
+
+func (a *Analysis) textOutput() ([]byte, error) {
+	var output strings.Builder
+	output.WriteString("\n")
+	if len(a.Results) == 0 {
+		output.WriteString(color.GreenString("No problems detected\n"))
+		return []byte(output.String()), nil
+	}
+	for n, result := range a.Results {
+		output.WriteString(fmt.Sprintf("%s %s(%s)\n", color.CyanString("%d", n),
+			color.YellowString(result.Name), color.CyanString(result.ParentObject)))
+		for _, err := range result.Error {
+			output.WriteString(fmt.Sprintf("- %s %s\n", color.RedString("Error:"), color.RedString(err.Text)))
+		}
+		output.WriteString(color.GreenString(result.Details + "\n"))
+	}
+	return []byte(output.String()), nil
+}