Add option to disable Blackfriday LaTeX style dashes

Can be used in site config of per page front matter:

```
[blackfriday]
latexDashes = false
```

Fixes #1231

diff --git a/helpers/content.go b/helpers/content.go
index 33df068cf18c5ce3abf4f989344294992f139b2e..b80f600a7c6552b67f2a0e4354693c04f906c1c5 100644 (file)
--- a/helpers/content.go
+++ b/helpers/content.go
@@ -42,6 +42,7 @@ var SummaryDivider = []byte("<!--more-->")
 type Blackfriday struct {
        AngledQuotes   bool
        Fractions      bool
+       LatexDashes    bool
        PlainIDAnchors bool
        Extensions     []string
        ExtensionsMask []string
@@ -52,6 +53,7 @@ func NewBlackfriday() *Blackfriday {
        return &Blackfriday{
                AngledQuotes:   false,
                Fractions:      true,
+               LatexDashes:    true,
                PlainIDAnchors: false,
        }
 }
@@ -145,7 +147,6 @@ func GetHTMLRenderer(defaultFlags int, ctx *RenderingContext) blackfriday.Render
        htmlFlags := defaultFlags
        htmlFlags |= blackfriday.HTML_USE_XHTML
        htmlFlags |= blackfriday.HTML_USE_SMARTYPANTS
-       htmlFlags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
        htmlFlags |= blackfriday.HTML_FOOTNOTE_RETURN_LINKS
 
        if ctx.getConfig().AngledQuotes {
@@ -156,6 +157,10 @@ func GetHTMLRenderer(defaultFlags int, ctx *RenderingContext) blackfriday.Render
                htmlFlags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS
        }
 
+       if ctx.getConfig().LatexDashes {
+               htmlFlags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES
+       }
+
        return blackfriday.HtmlRendererWithParameters(htmlFlags, "", "", renderParameters)
 }