shithub: hugo

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parser: Add some context to front matter parse error

Fixes #4638

--- a/parser/page.go

+++ b/parser/page.go

@@ -308,7 +308,7 @@

 	// pre-reads beginning delimiter length - 1 bytes from Reader

 	for i := 0; i < len(left)-1; i++ {

 		if c, err = r.ReadByte(); err != nil {

-			return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s", buf.Len(), err)

+			return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())

 		}

 		if err = buf.WriteByte(c); err != nil {

 			return nil, err

@@ -323,7 +323,7 @@

 	// is expected that the delimiter only contains one character.

 	for {

 		if c, err = r.ReadByte(); err != nil {

-			return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s", buf.Len(), err)

+			return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())

 		}

 		if err = buf.WriteByte(c); err != nil {

 			return nil, err

@@ -344,7 +344,7 @@

 					if err != nil {

 						// It is ok that the end delimiter ends with EOF

 						if err != io.EOF || level != 1 {

-							return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s", buf.Len(), err)

+							return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())

 						}

 					} else {

 						switch c {

@@ -358,7 +358,7 @@

 								return nil, err

 							}

 							if c, err = r.ReadByte(); err != nil {

-								return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s", buf.Len(), err)

+								return nil, fmt.Errorf("unable to read frontmatter at filepos %d: %s\n%.100s...", buf.Len(), err, buf.String())

 							}

 							if c != '\n' {

 								return nil, fmt.Errorf("frontmatter delimiter must be followed by CR+LF or LF but those can't be found at filepos %d", buf.Len())

-- 

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