Function printBuildOutput

main.go:1578–1637

Print diagnostics very similar to the -json flag in Go.

(err error, jsonDiagnostics bool)

// Print diagnostics very similar to the -json flag in Go.
func printBuildOutput(err error, jsonDiagnostics bool) {
	if err == nil {
		return // nothing to report
	}

	if jsonDiagnostics {
		workingDir, getwdErr := os.Getwd()
		if getwdErr != nil {
			workingDir = ""
		}

		type jsonDiagnosticOutput struct {
			ImportPath string
			Action     string
			Output     string `json:",omitempty"`
			StartPos   string `json:",omitempty"` // non-standard
			EndPos     string `json:",omitempty"` // non-standard
		}

		for _, diags := range diagnostics.CreateDiagnostics(err) {
			if diags.ImportPath != "" {
				output, _ := json.Marshal(jsonDiagnosticOutput{
					ImportPath: diags.ImportPath,
					Action:     "build-output",
					Output:     "# " + diags.ImportPath + "\n",
				})
				os.Stdout.Write(append(output, '\n'))
			}
			for _, diag := range diags.Diagnostics {
				w := &bytes.Buffer{}
				diag.WriteTo(w, workingDir)
				data := jsonDiagnosticOutput{
					ImportPath: diags.ImportPath,
					Action:     "build-output",
					Output:     w.String(),
				}
				if diag.StartPos.IsValid() && diag.EndPos.IsValid() {
					// Include the non-standard StartPos/EndPos values. These
					// are useful for the TinyGo Playground to show better error
					// messages.
					data.StartPos = diagnostics.RelativePosition(diag.StartPos, workingDir).String()
					data.EndPos = diagnostics.RelativePosition(diag.EndPos, workingDir).String()
				}
				output, _ := json.Marshal(data)
				os.Stdout.Write(append(output, '\n'))
			}

			// Emit the "Action":"build-fail" JSON.
			output, _ := json.Marshal(jsonDiagnosticOutput{
				ImportPath: diags.ImportPath,
				Action:     "build-fail",
			})
			os.Stdout.Write(append(output, '\n'))
		}
		os.Exit(1)
	}

	// Regular diagnostic handling.