Add logging for invalid model errors (#126)

Add logging for invalid model errors

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/126

vendor/github.com/cweill/gotests/internal/output/output.go

@@ -0,0 +1,65 @@
+package output
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+
+	"golang.org/x/tools/imports"
+
+	"github.com/cweill/gotests/internal/models"
+	"github.com/cweill/gotests/internal/render"
+)
+
+type Options struct {
+	PrintInputs bool
+	Subtests    bool
+	TemplateDir string
+}
+
+func Process(head *models.Header, funcs []*models.Function, opt *Options) ([]byte, error) {
+	if opt != nil && opt.TemplateDir != "" {
+		err := render.LoadCustomTemplates(opt.TemplateDir)
+		if err != nil {
+			return nil, fmt.Errorf("loading custom templates: %v", err)
+		}
+	}
+
+	tf, err := ioutil.TempFile("", "gotests_")
+	if err != nil {
+		return nil, fmt.Errorf("ioutil.TempFile: %v", err)
+	}
+	defer tf.Close()
+	defer os.Remove(tf.Name())
+	b := &bytes.Buffer{}
+	if err := writeTests(b, head, funcs, opt); err != nil {
+		return nil, err
+	}
+
+	out, err := imports.Process(tf.Name(), b.Bytes(), nil)
+	if err != nil {
+		return nil, fmt.Errorf("imports.Process: %v", err)
+	}
+	return out, nil
+}
+
+func IsFileExist(path string) bool {
+	_, err := os.Stat(path)
+	return !os.IsNotExist(err)
+}
+
+func writeTests(w io.Writer, head *models.Header, funcs []*models.Function, opt *Options) error {
+	b := bufio.NewWriter(w)
+	if err := render.Header(b, head); err != nil {
+		return fmt.Errorf("render.Header: %v", err)
+	}
+	for _, fun := range funcs {
+		if err := render.TestFunction(b, fun, opt.PrintInputs, opt.Subtests); err != nil {
+			return fmt.Errorf("render.TestFunction: %v", err)
+		}
+	}
+	return b.Flush()
+}