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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 committed 2018-04-17 10:20:38 +02:00
1 parent 5cc944ffd7
commit 159bed34c3
1 file changed
+4 -4
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parser/page.go
+4 -4
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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 // pre-reads beginning delimiter length - 1 bytes from Reader
for i := 0; i < len(left)-1; i++ { for i := 0; i < len(left)-1; i++ {
if c, err = r.ReadByte(); err != nil { 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 { if err = buf.WriteByte(c); err != nil {
return nil, err 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. // is expected that the delimiter only contains one character.
for { for {
if c, err = r.ReadByte(); err != nil { 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 { if err = buf.WriteByte(c); err != nil {
return nil, err return nil, err
@@ -344,7 +344,7 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
if err != nil { if err != nil {
// It is ok that the end delimiter ends with EOF // It is ok that the end delimiter ends with EOF
if err != io.EOF || level != 1 { 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 { } else {
switch c { switch c {
@@ -358,7 +358,7 @@ func extractFrontMatterDelims(r *bufio.Reader, left, right []byte) (fm []byte, e
return nil, err return nil, err
} }
if c, err = r.ReadByte(); err != nil { 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' { 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()) 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())