Markdown render hook for tables doesn't recognize unset column alignment

[chalin]

As of v0.134.0 (via #12809), Markdown render hooks for tables are supported.

While there are four possible column alignment syntaxes (see the table below), only three are reported: the --- (unset) syntax isn't recognized as distinct from left alignment :---.

When rendered, a cell from an unset column should have no text-align style set, but unfortunately, the following hook override fragment won't work:

{{- range . }}
  <th
    {{- with .Alignment -}}
      {{ printf " style=%q" (printf "text-align: %s" .) | safeHTMLAttr }}
    {{- end -}}
    >
    {{- .Text | safeHTML -}}
  </th>
{{- end }}

References:

• Markdown render hook - table #9316
• Add Markdown render hooks for tables #12809

Column alignment	Syntax
Unset	-----
Left	:----
Right	----:
Centered	:---:

[jmooring]

Goldmark handles this as expected (see playground example).

We should set the default to an empty string.

hugo/markup/goldmark/tables/tables.go

Lines 123 to 133 in d0dca65

	var alignment string
	switch n.Alignment {
	case gast.AlignLeft:
	alignment = "left"
	case gast.AlignRight:
	alignment = "right"
	case gast.AlignCenter:
	alignment = "center"
	default:
	alignment = "left"
	}

[bep]

We should set the default to an empty string.

Agree.