Make how-heavy-is-bold configurable

src/formatters/html.cr

@@ -15,6 +15,7 @@ module Tartrazine
     property? standalone : Bool = false
     property? surrounding_pre : Bool = true
     property? wrap_long_lines : Bool = false
+    property? weight_of_bold : Int32 = 600
 
     def format(text : String, lexer : Lexer, theme : Theme) : String
       text = format_text(text, lexer, theme)
@@ -43,7 +44,7 @@ module Tartrazine
           pre_style = wrap_long_lines? ? "style=\"white-space: pre-wrap; word-break: break-word;\"" : ""
           outp << "<pre class=\"#{get_css_class("Background", theme)}\" #{pre_style}>"
         end
-        "<code class=\"#{get_css_class("Background", theme)}\">"
+        outp << "<code class=\"#{get_css_class("Background", theme)}\">"
         lines.each_with_index(offset: line_number_start - 1) do |line, i|
           line_label = line_numbers? ? "#{i + 1}".rjust(4).ljust(5) : ""
           line_class = highlighted?(i + 1) ? "class=\"#{get_css_class("LineHighlight", theme)}\"" : ""
@@ -72,7 +73,7 @@ module Tartrazine
           # These are true/false/nil
           outp << "border: none;" if style.border == false
           outp << "font-weight: bold;" if style.bold
-          outp << "font-weight: 400;" if style.bold == false
+          outp << "font-weight: #{weight_of_bold};" if style.bold == false
           outp << "font-style: italic;" if style.italic
           outp << "font-style: normal;" if style.italic == false
           outp << "text-decoration: underline;" if style.underline