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parser: Add some context to front matter parse error

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Fixes #4638
This commit is contained in:
Bjørn Erik Pedersen 2018-04-17 10:20:16 +02:00
parent 5cc944ffd7
commit 159bed34c3
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GPG key ID: 330E6E2BD4859D8F
1 changed files with 4 additions and 4 deletions
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8
parser/page.go
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@ -308,7 +308,7 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
// 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 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
// 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 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
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 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
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())