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synced 2024-11-14 20:37:55 -05:00
Improve nilpointer error message
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parent
4174a7866b
commit
8d42a7942a
3 changed files with 35 additions and 1 deletions
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@ -19,8 +19,10 @@ import (
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"fmt"
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"io"
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"os"
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"regexp"
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"runtime"
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"runtime/debug"
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"strings"
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"time"
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)
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@ -116,3 +118,22 @@ func IsNotExist(err error) bool {
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return false
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}
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var nilPointerErrRe = regexp.MustCompile(`at <(.*)>: error calling (.*?): runtime error: invalid memory address or nil pointer dereference`)
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func ImproveIfNilPointer(inErr error) (outErr error) {
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outErr = inErr
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m := nilPointerErrRe.FindStringSubmatch(inErr.Error())
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if len(m) == 0 {
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return
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}
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call := m[1]
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field := m[2]
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parts := strings.Split(call, ".")
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receiverName := parts[len(parts)-2]
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receiver := strings.Join(parts[:len(parts)-1], ".")
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s := fmt.Sprintf("– %s is nil; wrap it in if or with: {{ with %s }}{{ .%s }}{{ end }}", receiverName, receiver, field)
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outErr = errors.New(nilPointerErrRe.ReplaceAllString(inErr.Error(), s))
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return
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}
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@ -170,3 +170,15 @@ Paginator: {{ .Paginator }}
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b.Assert(err, qt.IsNotNil)
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b.Assert(err.Error(), qt.Contains, `error calling Paginator: pagination not supported for this page: kind: "page"`)
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}
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func TestNilPointerErrorMessage(t *testing.T) {
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files := `
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-- hugo.toml --
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-- content/p1.md --
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-- layouts/_default/single.html --
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Home Filename: {{ site.Home.File.Filename }}
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`
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b, err := TestE(t, files)
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b.Assert(err, qt.IsNotNil)
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b.Assert(err.Error(), qt.Contains, `_default/single.html:1:22: executing "_default/single.html" – File is nil; wrap it in if or with: {{ with site.Home.File }}{{ .Filename }}{{ end }}`)
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}
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@ -20,6 +20,7 @@ import (
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"strings"
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"sync"
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"github.com/gohugoio/hugo/common/herrors"
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"github.com/gohugoio/hugo/hugolib/doctree"
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"github.com/gohugoio/hugo/config"
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@ -110,7 +111,7 @@ func (s *Site) renderPages(ctx *siteRenderContext) error {
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err := <-errs
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if err != nil {
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return fmt.Errorf("failed to render pages: %w", err)
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return fmt.Errorf("failed to render pages: %w", herrors.ImproveIfNilPointer(err))
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}
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return nil
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}
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